diff --git a/src/Renci.SshNet.NET35/Renci.SshNet.NET35.csproj b/src/Renci.SshNet.NET35/Renci.SshNet.NET35.csproj
index a6878d187..64ee419f3 100644
--- a/src/Renci.SshNet.NET35/Renci.SshNet.NET35.csproj
+++ b/src/Renci.SshNet.NET35/Renci.SshNet.NET35.csproj
@@ -18,7 +18,7 @@
     <DebugType>full</DebugType>
     <Optimize>false</Optimize>
     <OutputPath>bin\Debug\</OutputPath>
-    <DefineConstants>TRACE;DEBUG;FEATURE_REGEX_COMPILE;FEATURE_BINARY_SERIALIZATION;FEATURE_RNG_CREATE;FEATURE_SOCKET_SYNC;FEATURE_SOCKET_EAP;FEATURE_SOCKET_APM;FEATURE_SOCKET_SETSOCKETOPTION;FEATURE_SOCKET_POLL;FEATURE_STREAM_APM;FEATURE_DNS_SYNC;FEATURE_THREAD_THREADPOOL;FEATURE_THREAD_SLEEP;FEATURE_HASH_MD5;FEATURE_HASH_SHA1_CREATE;FEATURE_HASH_SHA256_CREATE;FEATURE_HASH_SHA384_CREATE;FEATURE_HASH_SHA512_CREATE;FEATURE_HASH_RIPEMD160_CREATE;FEATURE_HMAC_MD5;FEATURE_HMAC_SHA1;FEATURE_HMAC_SHA256;FEATURE_HMAC_SHA384;FEATURE_HMAC_SHA512;FEATURE_HMAC_RIPEMD160;FEATURE_MEMORYSTREAM_GETBUFFER;FEATURE_DIAGNOSTICS_TRACESOURCE;FEATURE_ENCODING_ASCII</DefineConstants>
+    <DefineConstants>TRACE;DEBUG;FEATURE_REGEX_COMPILE;FEATURE_BINARY_SERIALIZATION;FEATURE_RNG_CREATE;FEATURE_SOCKET_SYNC;FEATURE_SOCKET_EAP;FEATURE_SOCKET_APM;FEATURE_SOCKET_SETSOCKETOPTION;FEATURE_SOCKET_POLL;FEATURE_STREAM_APM;FEATURE_DNS_SYNC;FEATURE_THREAD_THREADPOOL;FEATURE_THREAD_SLEEP;FEATURE_HASH_MD5;FEATURE_HASH_SHA1_CREATE;FEATURE_HASH_SHA256_CREATE;FEATURE_HASH_SHA384_CREATE;FEATURE_HASH_SHA512_CREATE;FEATURE_HASH_RIPEMD160_CREATE;FEATURE_HMAC_MD5;FEATURE_HMAC_SHA1;FEATURE_HMAC_SHA256;FEATURE_HMAC_SHA384;FEATURE_HMAC_SHA512;FEATURE_HMAC_RIPEMD160;FEATURE_MEMORYSTREAM_GETBUFFER;FEATURE_DIAGNOSTICS_TRACESOURCE;FEATURE_ENCODING_ASCII;FEATURE_ECDSA</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
@@ -29,7 +29,7 @@
     <DebugType>none</DebugType>
     <Optimize>true</Optimize>
     <OutputPath>bin\Release\</OutputPath>
-    <DefineConstants>TRACE;FEATURE_REGEX_COMPILE;FEATURE_BINARY_SERIALIZATION;FEATURE_RNG_CREATE;FEATURE_SOCKET_SYNC;FEATURE_SOCKET_EAP;FEATURE_SOCKET_APM;FEATURE_SOCKET_SETSOCKETOPTION;FEATURE_SOCKET_POLL;FEATURE_STREAM_APM;FEATURE_DNS_SYNC;FEATURE_THREAD_THREADPOOL;FEATURE_THREAD_SLEEP;FEATURE_HASH_MD5;FEATURE_HASH_SHA1_CREATE;FEATURE_HASH_SHA256_CREATE;FEATURE_HASH_SHA384_CREATE;FEATURE_HASH_SHA512_CREATE;FEATURE_HASH_RIPEMD160_CREATE;FEATURE_HMAC_MD5;FEATURE_HMAC_SHA1;FEATURE_HMAC_SHA256;FEATURE_HMAC_SHA384;FEATURE_HMAC_SHA512;FEATURE_HMAC_RIPEMD160;FEATURE_MEMORYSTREAM_GETBUFFER;FEATURE_DIAGNOSTICS_TRACESOURCE;FEATURE_ENCODING_ASCII</DefineConstants>
+    <DefineConstants>TRACE;FEATURE_REGEX_COMPILE;FEATURE_BINARY_SERIALIZATION;FEATURE_RNG_CREATE;FEATURE_SOCKET_SYNC;FEATURE_SOCKET_EAP;FEATURE_SOCKET_APM;FEATURE_SOCKET_SETSOCKETOPTION;FEATURE_SOCKET_POLL;FEATURE_STREAM_APM;FEATURE_DNS_SYNC;FEATURE_THREAD_THREADPOOL;FEATURE_THREAD_SLEEP;FEATURE_HASH_MD5;FEATURE_HASH_SHA1_CREATE;FEATURE_HASH_SHA256_CREATE;FEATURE_HASH_SHA384_CREATE;FEATURE_HASH_SHA512_CREATE;FEATURE_HASH_RIPEMD160_CREATE;FEATURE_HMAC_MD5;FEATURE_HMAC_SHA1;FEATURE_HMAC_SHA256;FEATURE_HMAC_SHA384;FEATURE_HMAC_SHA512;FEATURE_HMAC_RIPEMD160;FEATURE_MEMORYSTREAM_GETBUFFER;FEATURE_DIAGNOSTICS_TRACESOURCE;FEATURE_ENCODING_ASCII;FEATURE_ECDSA</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
     <DocumentationFile>bin\Release\Renci.SshNet.xml</DocumentationFile>
@@ -695,6 +695,12 @@
     <Compile Include="..\Renci.SshNet\Security\Cryptography\Key.cs">
       <Link>Security\Cryptography\Key.cs</Link>
     </Compile>
+    <Compile Include="..\Renci.SshNet\Security\Cryptography\EcdsaDigitalSignature.cs">
+      <Link>Security\Cryptography\EcdsaDigitalSignature.cs</Link>
+    </Compile>
+    <Compile Include="..\Renci.SshNet\Security\Cryptography\EcdsaKey.cs">
+      <Link>Security\Cryptography\EcdsaKey.cs</Link>
+    </Compile>
     <Compile Include="..\Renci.SshNet\Security\Cryptography\RsaDigitalSignature.cs">
       <Link>Security\Cryptography\RsaDigitalSignature.cs</Link>
     </Compile>
diff --git a/src/Renci.SshNet.Tests.NET35/Renci.SshNet.Tests.NET35.csproj b/src/Renci.SshNet.Tests.NET35/Renci.SshNet.Tests.NET35.csproj
index a42cf8ec1..893a6fe0c 100644
--- a/src/Renci.SshNet.Tests.NET35/Renci.SshNet.Tests.NET35.csproj
+++ b/src/Renci.SshNet.Tests.NET35/Renci.SshNet.Tests.NET35.csproj
@@ -1737,6 +1737,26 @@
       <Link>Data\Key.SSH2.RSA.txt</Link>
     </EmbeddedResource>
   </ItemGroup>
+  <ItemGroup>
+    <EmbeddedResource Include="..\Renci.SshNet.Tests\Data\Key.ECDSA.txt">
+      <Link>Data\Key.ECDSA.txt</Link>
+    </EmbeddedResource>
+    <EmbeddedResource Include="..\Renci.SshNet.Tests\Data\Key.ECDSA384.txt">
+      <Link>Data\Key.ECDSA384.txt</Link>
+    </EmbeddedResource>
+    <EmbeddedResource Include="..\Renci.SshNet.Tests\Data\Key.ECDSA521.txt">
+      <Link>Data\Key.ECDSA521.txt</Link>
+    </EmbeddedResource>
+    <EmbeddedResource Include="..\Renci.SshNet.Tests\Data\Key.ECDSA.Encrypted.txt">
+      <Link>Data\Key.ECDSA.Encrypted.txt</Link>
+    </EmbeddedResource>
+    <EmbeddedResource Include="..\Renci.SshNet.Tests\Data\Key.ECDSA384.Encrypted.txt">
+      <Link>Data\Key.ECDSA384.Encrypted.txt</Link>
+    </EmbeddedResource>
+    <EmbeddedResource Include="..\Renci.SshNet.Tests\Data\Key.ECDSA521.Encrypted.txt">
+      <Link>Data\Key.ECDSA521.Encrypted.txt</Link>
+    </EmbeddedResource>
+  </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <ProjectExtensions>
     <VisualStudio>
diff --git a/src/Renci.SshNet.Tests/Classes/PrivateKeyFileTest.cs b/src/Renci.SshNet.Tests/Classes/PrivateKeyFileTest.cs
index 21bd97853..d3cb9729d 100644
--- a/src/Renci.SshNet.Tests/Classes/PrivateKeyFileTest.cs
+++ b/src/Renci.SshNet.Tests/Classes/PrivateKeyFileTest.cs
@@ -319,6 +319,94 @@ public void Test_PrivateKey_RSA_DES_EDE3_CFB()
             }
         }
 
+        [TestMethod]
+        [Owner("darinkes")]
+        [TestCategory("PrivateKey")]
+        public void Test_PrivateKey_ECDSA()
+        {
+            using (var stream = GetData("Key.ECDSA.txt"))
+            {
+                new PrivateKeyFile(stream);
+            }
+        }
+
+        [TestMethod]
+        [Owner("darinkes")]
+        [TestCategory("PrivateKey")]
+        public void Test_PrivateKey_ECDSA384()
+        {
+            using (var stream = GetData("Key.ECDSA384.txt"))
+            {
+                new PrivateKeyFile(stream);
+            }
+        }
+
+        [TestMethod]
+        [Owner("darinkes")]
+        [TestCategory("PrivateKey")]
+        public void Test_PrivateKey_ECDSA521()
+        {
+            using (var stream = GetData("Key.ECDSA521.txt"))
+            {
+                new PrivateKeyFile(stream);
+            }
+        }
+
+        [TestMethod]
+        [Owner("darinkes")]
+        [TestCategory("PrivateKey")]
+        public void Test_PrivateKey_ECDSA_Encrypted()
+        {
+            using (var stream = GetData("Key.ECDSA.Encrypted.txt"))
+            {
+                new PrivateKeyFile(stream, "12345");
+            }
+        }
+
+        [TestMethod]
+        [Owner("darinkes")]
+        [TestCategory("PrivateKey")]
+        public void Test_PrivateKey_ECDSA384_Encrypted()
+        {
+            using (var stream = GetData("Key.ECDSA384.Encrypted.txt"))
+            {
+                new PrivateKeyFile(stream, "12345");
+            }
+        }
+
+        [TestMethod]
+        [Owner("darinkes")]
+        [TestCategory("PrivateKey")]
+        public void Test_PrivateKey_ECDSA521_Encrypted()
+        {
+            using (var stream = GetData("Key.ECDSA521.Encrypted.txt"))
+            {
+                new PrivateKeyFile(stream, "12345");
+            }
+        }
+
+        [TestMethod]
+        [Owner("darinkes")]
+        [TestCategory("PrivateKey")]
+        public void Test_PrivateKey_ED25519()
+        {
+            using (var stream = GetData("Key.ED25519.txt"))
+            {
+                new PrivateKeyFile(stream, "12345");
+            }
+        }
+
+        [TestMethod]
+        [Owner("darinkes")]
+        [TestCategory("PrivateKey")]
+        public void Test_PrivateKey_ED25519_Encrypted()
+        {
+            using (var stream = GetData("Key.ED25519.Encrypted.txt"))
+            {
+                new PrivateKeyFile(stream, "12345");
+            }
+        }
+
         /// <summary>
         ///A test for Dispose
         ///</summary>
diff --git a/src/Renci.SshNet.Tests/Data/Key.ECDSA.Encrypted.txt b/src/Renci.SshNet.Tests/Data/Key.ECDSA.Encrypted.txt
new file mode 100644
index 000000000..f0af5ba7d
--- /dev/null
+++ b/src/Renci.SshNet.Tests/Data/Key.ECDSA.Encrypted.txt
@@ -0,0 +1,8 @@
+-----BEGIN EC PRIVATE KEY-----
+Proc-Type: 4,ENCRYPTED
+DEK-Info: AES-128-CBC,54D46F498C989115AAE14FEA21E3AF11
+
+IQdFnndcbzz10d7YQIgEE1TzuzJrm7uYJr4Hvdfz/FshVxMRqxqaqtEgo2vAHHik
+BOcPkm+84ERlTNPslcJqLSkKzCdxb7Rz5hfwHuN3Y6Lf01qGakDlzAUEjEyDor+4
+zQtAne+f+gRUJnBvLLoVhH4xdeQFC55GECNUFQpEmos=
+-----END EC PRIVATE KEY-----
\ No newline at end of file
diff --git a/src/Renci.SshNet.Tests/Data/Key.ECDSA.txt b/src/Renci.SshNet.Tests/Data/Key.ECDSA.txt
new file mode 100644
index 000000000..13ac9fb49
--- /dev/null
+++ b/src/Renci.SshNet.Tests/Data/Key.ECDSA.txt
@@ -0,0 +1,5 @@
+-----BEGIN EC PRIVATE KEY-----
+MHcCAQEEIEdqaFKgJBIibVjyUh1v7Y35LwIQJrocdTaYFLwl7iB0oAoGCCqGSM49
+AwEHoUQDQgAEQD5MO/n9yqSDTszwzVpApLx5SQFecE5ZfDkgxqVdHQecm1BAPozZ
+4eKGNhKn72hT79mLlp9HXX+oNEcuVT83Hw==
+-----END EC PRIVATE KEY-----
\ No newline at end of file
diff --git a/src/Renci.SshNet.Tests/Data/Key.ECDSA384.Encrypted.txt b/src/Renci.SshNet.Tests/Data/Key.ECDSA384.Encrypted.txt
new file mode 100644
index 000000000..00072ce24
--- /dev/null
+++ b/src/Renci.SshNet.Tests/Data/Key.ECDSA384.Encrypted.txt
@@ -0,0 +1,9 @@
+-----BEGIN EC PRIVATE KEY-----
+Proc-Type: 4,ENCRYPTED
+DEK-Info: AES-128-CBC,1D64653C5E18C2AACB0B17E3FE43C219
+
+lCtRmcvKSeIACwqTtsf/ei1brtCZ386rsk/j7bSXdkZBpvzcmzbeo6w6CYm206Km
+hV9TMl2dIO/I1/ov5/2VIR3ZkaElyDOJD/+Be0e3aus4EZj1H1YM/Dv+4QJId+is
+Cw4ycWjfudYPPejGdiyjzt5qjaIJwrrEvGtMg7sWVAqDpjcAjS9KuaCu5nOgdItL
+s7oHuz+DTGdJQNfUHAlUnz1JaMRWzpP0MwtxdcaRY+w=
+-----END EC PRIVATE KEY-----
\ No newline at end of file
diff --git a/src/Renci.SshNet.Tests/Data/Key.ECDSA384.txt b/src/Renci.SshNet.Tests/Data/Key.ECDSA384.txt
new file mode 100644
index 000000000..f2d658ea4
--- /dev/null
+++ b/src/Renci.SshNet.Tests/Data/Key.ECDSA384.txt
@@ -0,0 +1,6 @@
+-----BEGIN EC PRIVATE KEY-----
+MIGkAgEBBDCQawHdHLR7NvKa2vPV0sVkbzOE8c0enp95iEysGcGV66RXE1EH//nh
+gu5UzeTR4KigBwYFK4EEACKhZANiAAQUk4rVvoOPI1hQzWpNx09Uo6qG+srGcbvB
+q15eFK0GnK/T0UBKxdbZ2+//KAYI6SeDHM9t3ORF1aX5EpjTEBI4d7ZY/lV9jX6M
+nJ4XuGteJselM2iMmy+p9ZYw83BYB1Y=
+-----END EC PRIVATE KEY-----
\ No newline at end of file
diff --git a/src/Renci.SshNet.Tests/Data/Key.ECDSA521.Encrypted.txt b/src/Renci.SshNet.Tests/Data/Key.ECDSA521.Encrypted.txt
new file mode 100644
index 000000000..381b30be8
--- /dev/null
+++ b/src/Renci.SshNet.Tests/Data/Key.ECDSA521.Encrypted.txt
@@ -0,0 +1,10 @@
+-----BEGIN EC PRIVATE KEY-----
+Proc-Type: 4,ENCRYPTED
+DEK-Info: AES-128-CBC,F995028237EBD79C928530CC6C3E957F
+
+wT+iajbte4MnpCipVy/7W9t2I8OgwbMjNBw9PB5xmXR1NQX+yWa81DXMTgjHi8++
+6tp+Vlftkr7mY1yvZCVo1Sy4VgcvZeMhtpVKtvYdMCmHJC6gaDOTYX3yee8DJ4FL
+fG+IQz0wFyZZ26NFrHiwbufW9z6pXhGNCQZK0KLbFxI9iKwVA0llc7uzTEcmBBpn
+0/Snp0CVvX+i6AP9Xj0bBdrFCsvcoT+ZHzS8YWJUfu3m6cpAJksCAy0PXR3ifvus
+edTfDpkMxd4/b+DtPB6SMekIAjnQyzbyaTwJCujm8iU=
+-----END EC PRIVATE KEY-----
\ No newline at end of file
diff --git a/src/Renci.SshNet.Tests/Data/Key.ECDSA521.txt b/src/Renci.SshNet.Tests/Data/Key.ECDSA521.txt
new file mode 100644
index 000000000..31abe917a
--- /dev/null
+++ b/src/Renci.SshNet.Tests/Data/Key.ECDSA521.txt
@@ -0,0 +1,7 @@
+-----BEGIN EC PRIVATE KEY-----
+MIHcAgEBBEIBn2DAme7AU8sCA+/sd6s3c2FNW26IiPvulGd3FC8k5q+fjBZ5LUWR
+iJMGrsf2rJLO8hXMGJYoF9tjZEGaabQ8KVagBwYFK4EEACOhgYkDgYYABABrpVjs
+ANqcvqMUo1wo0I1uVCXQ6xrauy4iU86FiOwFmkYRrle4w3oYdRJwniC3TwGMuBuM
+PMIoCTXr0UtUzn1vkQESNR/J/jAxVseLlVe+KDfZHKvsvk2+O4XaSa1qMfLwN3sp
+wlj08+ylKjlO6V3g0hbz4ZaSVwuiRS7Xsv8W2MV6rg==
+-----END EC PRIVATE KEY-----
\ No newline at end of file
diff --git a/src/Renci.SshNet.Tests/Data/Key.ED25519.Encrypted.txt b/src/Renci.SshNet.Tests/Data/Key.ED25519.Encrypted.txt
new file mode 100644
index 000000000..78a8cd863
--- /dev/null
+++ b/src/Renci.SshNet.Tests/Data/Key.ED25519.Encrypted.txt
@@ -0,0 +1,8 @@
+-----BEGIN OPENSSH PRIVATE KEY-----
+b3BlbnNzaC1rZXktdjEAAAAACmFlczI1Ni1jdHIAAAAGYmNyeXB0AAAAGAAAABCziVlGog
+eUxEUKJcduOqCCAAAAEAAAAAEAAAAzAAAAC3NzaC1lZDI1NTE5AAAAIBZfAisK02MKZeSy
+MGo9lxq7Otgg1ll2Qhp+ySacRk2CAAAAoDc5MjTED1jcIotaaqc6DcnADwVnPf/4iC9BM2
++2C+6uKXuYGOuqb16kFHn8yYAkABX2mtQo1GmJt5lPriMkJ1qNfZ6gg1jgXVrFru8zHSfY
+Gr9tniFSkdnrP/XHaEkQwEPptUlRF1eG+3hOO1D1vW0SliXBfg1DWd/Yew55kljzmtgxsg
+J2dfTYZF5L6xblNjM6mr5NItdhUsVB4XsYWo4=
+-----END OPENSSH PRIVATE KEY-----
\ No newline at end of file
diff --git a/src/Renci.SshNet.Tests/Data/Key.ED25519.txt b/src/Renci.SshNet.Tests/Data/Key.ED25519.txt
new file mode 100644
index 000000000..b46999587
--- /dev/null
+++ b/src/Renci.SshNet.Tests/Data/Key.ED25519.txt
@@ -0,0 +1,7 @@
+-----BEGIN OPENSSH PRIVATE KEY-----
+b3BlbnNzaC1rZXktdjEAAAAABG5vbmUAAAAEbm9uZQAAAAAAAAABAAAAMwAAAAtzc2gtZW
+QyNTUxOQAAACCCsGI6AEHghOMbGIhtsRX59CjoqwkCgDMLgOqGByvrPAAAAKDryTjh68k4
+4QAAAAtzc2gtZWQyNTUxOQAAACCCsGI6AEHghOMbGIhtsRX59CjoqwkCgDMLgOqGByvrPA
+AAAECcZJX7mXgmBR60wXj51bhpkw21jDt95z4VBbXHEjbgMYKwYjoAQeCE4xsYiG2xFfn0
+KOirCQKAMwuA6oYHK+s8AAAAFnNyaW5rZXNAV0lOREVWLVNSSU5LRVMBAgMEBQYH
+-----END OPENSSH PRIVATE KEY-----
\ No newline at end of file
diff --git a/src/Renci.SshNet.Tests/Renci.SshNet.Tests.csproj b/src/Renci.SshNet.Tests/Renci.SshNet.Tests.csproj
index d968dd27b..69d3058bf 100644
--- a/src/Renci.SshNet.Tests/Renci.SshNet.Tests.csproj
+++ b/src/Renci.SshNet.Tests/Renci.SshNet.Tests.csproj
@@ -709,6 +709,20 @@
       <Name>Renci.SshNet</Name>
     </ProjectReference>
   </ItemGroup>
+  <ItemGroup>
+    <EmbeddedResource Include="Data\Key.ECDSA.txt" />
+    <EmbeddedResource Include="Data\Key.ECDSA384.txt" />
+    <EmbeddedResource Include="Data\Key.ECDSA521.txt" />
+    <EmbeddedResource Include="Data\Key.ECDSA.Encrypted.txt" />
+    <EmbeddedResource Include="Data\Key.ECDSA384.Encrypted.txt" />
+    <EmbeddedResource Include="Data\Key.ECDSA521.Encrypted.txt" />
+  </ItemGroup>
+  <ItemGroup>
+    <EmbeddedResource Include="Data\Key.ED25519.txt" />
+  </ItemGroup>
+  <ItemGroup>
+    <EmbeddedResource Include="Data\Key.ED25519.Encrypted.txt" />
+  </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
        Other similar extension points exist, see Microsoft.Common.targets.
diff --git a/src/Renci.SshNet/Common/DerData.cs b/src/Renci.SshNet/Common/DerData.cs
index c84c0b176..59c93a11f 100644
--- a/src/Renci.SshNet/Common/DerData.cs
+++ b/src/Renci.SshNet/Common/DerData.cs
@@ -12,7 +12,7 @@ public class DerData
 
         private const byte Boolean = 0x01;
         private const byte Integer = 0x02;
-        //private const byte BITSTRING = 0x03;
+        private const byte BITSTRING = 0x03;
         private const byte Octetstring = 0x04;
         private const byte Null = 0x05;
         private const byte Objectidentifier = 0x06;
@@ -101,7 +101,7 @@ public BigInteger ReadBigInteger()
         {
             var type = ReadByte();
             if (type != Integer)
-                throw new InvalidOperationException("Invalid data type, INTEGER(02) is expected.");
+                throw new InvalidOperationException(string.Format("Invalid data type, INTEGER(02) is expected, got {0}", type));
 
             var length = ReadLength();
 
@@ -118,7 +118,7 @@ public int ReadInteger()
         {
             var type = ReadByte();
             if (type != Integer)
-                throw new InvalidOperationException("Invalid data type, INTEGER(02) is expected.");
+                throw new InvalidOperationException(string.Format("Invalid data type, INTEGER(02) is expected, got {0}", type));
 
             var length = ReadLength();
 
@@ -140,6 +140,36 @@ public int ReadInteger()
             return result;
         }
 
+        /// <summary>
+        /// Reads next octetstring data type from internal buffer.
+        /// </summary>
+        /// <returns>data read.</returns>
+        public byte[] ReadOctetString()
+        {
+            var type = ReadByte();
+            if (type != Octetstring)
+                throw new InvalidOperationException(string.Format("Invalid data type, OCTETSTRING(04) is expected, got {0}", type));
+
+            var length = ReadLength();
+            var data = ReadBytes(length);
+            return data;
+        }
+
+        /// <summary>
+        /// Reads next object data type from internal buffer.
+        /// </summary>
+        /// <returns>data read.</returns>
+        public byte[] ReadObject()
+        {
+            var type = ReadByte();
+            if (type != Objectidentifier)
+                throw new InvalidOperationException(string.Format("Invalid data type, OBJECT(06) is expected, got {0}", type));
+
+            var length = ReadLength();
+            var data = ReadBytes(length);
+            return data;
+        }
+
         /// <summary>
         /// Writes BOOLEAN data into internal buffer.
         /// </summary>
@@ -189,6 +219,18 @@ public void Write(byte[] data)
             WriteBytes(data);
         }
 
+        /// <summary>
+        /// Writes BITSTRING data into internal buffer.
+        /// </summary>
+        /// <param name="data">The data.</param>
+        public void WriteBitstring(byte[] data)
+        {
+            _data.Add(BITSTRING);
+            var length = GetLength(data.Length);
+            WriteBytes(length);
+            WriteBytes(data);
+        }
+
         /// <summary>
         /// Writes OBJECTIDENTIFIER data into internal buffer.
         /// </summary>
@@ -229,6 +271,18 @@ public void Write(ObjectIdentifier identifier)
             WriteBytes(bytes);
         }
 
+        /// <summary>
+        /// Writes OBJECTIDENTIFIER data into internal buffer.
+        /// </summary>
+        /// <param name="bytes">The bytes.</param>
+        public void WriteObjectIdentifier(byte[] bytes)
+        {
+            _data.Add(Objectidentifier);
+            var length = GetLength(bytes.Length);
+            WriteBytes(length);
+            WriteBytes(bytes);
+        }
+
         /// <summary>
         /// Writes NULL data into internal buffer.
         /// </summary>
@@ -270,8 +324,11 @@ private static IEnumerable<byte> GetLength(int length)
             }
             return new[] {(byte) length};
         }
-
-        private int ReadLength()
+        /// <summary>
+        /// Gets Data Length
+        /// </summary>
+        /// <returns>length</returns>
+        public int ReadLength()
         {
             int length = ReadByte();
 
@@ -306,12 +363,19 @@ private int ReadLength()
             return length;
         }
 
-        private void WriteBytes(IEnumerable<byte> data)
+        /// <summary>
+        /// Write Byte data into internal buffer.
+        /// </summary>
+        public void WriteBytes(IEnumerable<byte> data)
         {
             _data.AddRange(data);
         }
 
-        private byte ReadByte()
+        /// <summary>
+        /// Reads Byte data into internal buffer.
+        /// </summary>
+        /// <returns>data read</returns>
+        public byte ReadByte()
         {
             if (_readerIndex > _data.Count)
                 throw new InvalidOperationException("Read out of boundaries.");
@@ -319,7 +383,12 @@ private byte ReadByte()
             return _data[_readerIndex++];
         }
 
-        private byte[] ReadBytes(int length)
+        /// <summary>
+        /// Reads lengths Bytes data into internal buffer.
+        /// </summary>
+        /// <returns>data read</returns>
+        ///  <param name="length">amount of data to read.</param>
+        public byte[] ReadBytes(int length)
         {
             if (_readerIndex + length > _data.Count)
                 throw new InvalidOperationException("Read out of boundaries.");
diff --git a/src/Renci.SshNet/ConnectionInfo.cs b/src/Renci.SshNet/ConnectionInfo.cs
index f9b872d3c..b7e01fd12 100644
--- a/src/Renci.SshNet/ConnectionInfo.cs
+++ b/src/Renci.SshNet/ConnectionInfo.cs
@@ -379,7 +379,12 @@ public ConnectionInfo(string host, int port, string username, ProxyTypes proxyTy
                 {
                     {"ssh-rsa", data => new KeyHostAlgorithm("ssh-rsa", new RsaKey(), data)},
                     {"ssh-dss", data => new KeyHostAlgorithm("ssh-dss", new DsaKey(), data)},
-                    //{"ecdsa-sha2-nistp256 "}
+#if FEATURE_ECDSA
+                    {"ecdsa-sha2-nistp256", data => new KeyHostAlgorithm("ecdsa-sha2-nistp256", new EcdsaKey(), data)},
+                    {"ecdsa-sha2-nistp384", data => new KeyHostAlgorithm("ecdsa-sha2-nistp384", new EcdsaKey(), data)},
+                    {"ecdsa-sha2-nistp521", data => new KeyHostAlgorithm("ecdsa-sha2-nistp521", new EcdsaKey(), data)},
+#endif
+                    {"ssh-ed25519", data => new KeyHostAlgorithm("ssh-ed25519", new ED25519Key(), data)},
                     //{"x509v3-sign-rsa", () => { ... },
                     //{"x509v3-sign-dss", () => { ... },
                     //{"spki-sign-rsa", () => { ... },
diff --git a/src/Renci.SshNet/OpenSSHKeyReader.cs b/src/Renci.SshNet/OpenSSHKeyReader.cs
new file mode 100644
index 000000000..192d50882
--- /dev/null
+++ b/src/Renci.SshNet/OpenSSHKeyReader.cs
@@ -0,0 +1,72 @@
+using Renci.SshNet.Common;
+using Renci.SshNet.Security;
+using System.Text;
+
+namespace Renci.SshNet
+{
+    class OpenSSHKeyReader : SshData
+    {
+        // See doc: https://github.com/openssh/openssh-portable/blob/master/PROTOCOL.key
+        // Reference: https://github.com/net-ssh/net-ssh/blob/dd13dd44d68b7fa82d4ca9a3bbe18e30c855f1d2/lib/net/ssh/authentication/ed25519.rb
+
+        const string AUTH_MAGIC = "openssh-key-v1";
+
+        public OpenSSHKeyReader(byte[] data)
+        {
+            Load(data);
+        }
+
+        public ED25519Key ReadKey()
+        {
+            var magic = Encoding.ASCII.GetString(ReadBytes(AUTH_MAGIC.Length));
+            if (magic != AUTH_MAGIC)
+                throw new SshException("Unsupported OPENSSH Format: " + magic);
+
+            ReadByte(); // 0 terminated String
+
+            var cipher = ReadString(Encoding.ASCII);
+            var kdfname = ReadString(Encoding.ASCII);
+            var kdfoptions = ReadString(Encoding.ASCII);
+
+            var num_keys = ReadUInt32();
+
+            if (num_keys > 1)
+                throw new SshException("Currently just one key is supported");
+
+            // we don't care for the Public-Keys
+            for (int i = 0; i < num_keys; i++)
+            {
+                ReadString(Encoding.ASCII);
+            }
+
+            var len = ReadUInt32();
+
+            // XXX decrypt Data
+
+            var checkint1 = ReadUInt32();
+            var checkint2 = ReadUInt32();
+
+            if (checkint1 != checkint2)
+                throw new SshException(string.Format("Check Integer mismatch: {0} <-> {1}", checkint1, checkint2));
+
+            var keytype = ReadString(Encoding.ASCII);
+            if (keytype != "ssh-ed25519")
+                throw new SshException("Unsupported Key-Type: " + keytype);
+            len = ReadUInt32();
+            var pk = ReadBytes((int)len).Reverse();
+            len = ReadUInt32();
+            var sk = ReadBytes((int)len);
+            var comment = ReadString(Encoding.ASCII);
+
+            return new ED25519Key(pk, sk);
+        }
+
+        protected override void LoadData()
+        {
+        }
+
+        protected override void SaveData()
+        {
+        }
+    }
+}
diff --git a/src/Renci.SshNet/PrivateKeyFile.cs b/src/Renci.SshNet/PrivateKeyFile.cs
index f44672347..3fc09f6ad 100644
--- a/src/Renci.SshNet/PrivateKeyFile.cs
+++ b/src/Renci.SshNet/PrivateKeyFile.cs
@@ -197,6 +197,17 @@ private void Open(Stream privateKey, string passPhrase)
                     _key = new DsaKey(decryptedData);
                     HostKey = new KeyHostAlgorithm("ssh-dss", _key);
                     break;
+#if FEATURE_ECDSA
+                case "EC":
+                    _key = new EcdsaKey(decryptedData);
+                    HostKey = new KeyHostAlgorithm(_key.ToString(), _key);
+                    break;
+#endif
+                case "OPENSSH":
+                    var ssh_reader = new OpenSSHKeyReader(decryptedData);
+                    _key = ssh_reader.ReadKey();
+                    HostKey = new KeyHostAlgorithm(_key.ToString(), _key);
+                    break;
                 case "SSH2 ENCRYPTED":
                     var reader = new SshDataReader(decryptedData);
                     var magicNumber = reader.ReadUInt32();
@@ -341,7 +352,7 @@ private static byte[] DecryptKey(CipherInfo cipherInfo, byte[] cipherData, strin
             return cipher.Decrypt(cipherData);
         }
 
-        #region IDisposable Members
+#region IDisposable Members
 
         private bool _isDisposed;
 
@@ -385,7 +396,7 @@ protected virtual void Dispose(bool disposing)
             Dispose(false);
         }
 
-        #endregion
+#endregion
 
         private class SshDataReader : SshData
         {
diff --git a/src/Renci.SshNet/Renci.SshNet.csproj b/src/Renci.SshNet/Renci.SshNet.csproj
index 0598d18ce..d77f03640 100644
--- a/src/Renci.SshNet/Renci.SshNet.csproj
+++ b/src/Renci.SshNet/Renci.SshNet.csproj
@@ -18,7 +18,7 @@
     <DebugType>full</DebugType>
     <Optimize>false</Optimize>
     <OutputPath>bin\Debug\</OutputPath>
-    <DefineConstants>TRACE;DEBUG;FEATURE_REGEX_COMPILE;FEATURE_BINARY_SERIALIZATION;FEATURE_RNG_CREATE;FEATURE_SOCKET_SYNC;FEATURE_SOCKET_EAP;FEATURE_SOCKET_APM;FEATURE_SOCKET_SETSOCKETOPTION;FEATURE_SOCKET_SELECT;FEATURE_SOCKET_POLL;FEATURE_SOCKET_DISPOSE;FEATURE_STREAM_APM;FEATURE_DNS_SYNC;FEATURE_THREAD_COUNTDOWNEVENT;FEATURE_THREAD_THREADPOOL;FEATURE_THREAD_SLEEP;FEATURE_WAITHANDLE_DISPOSE;FEATURE_HASH_MD5;FEATURE_HASH_SHA1_CREATE;FEATURE_HASH_SHA256_CREATE;FEATURE_HASH_SHA384_CREATE;FEATURE_HASH_SHA512_CREATE;FEATURE_HASH_RIPEMD160_CREATE;FEATURE_HMAC_MD5;FEATURE_HMAC_SHA1;FEATURE_HMAC_SHA256;FEATURE_HMAC_SHA384;FEATURE_HMAC_SHA512;FEATURE_HMAC_RIPEMD160;FEATURE_MEMORYSTREAM_GETBUFFER;FEATURE_DIAGNOSTICS_TRACESOURCE;FEATURE_ENCODING_ASCII</DefineConstants>
+    <DefineConstants>TRACE;DEBUG;FEATURE_REGEX_COMPILE;FEATURE_BINARY_SERIALIZATION;FEATURE_RNG_CREATE;FEATURE_SOCKET_SYNC;FEATURE_SOCKET_EAP;FEATURE_SOCKET_APM;FEATURE_SOCKET_SETSOCKETOPTION;FEATURE_SOCKET_SELECT;FEATURE_SOCKET_POLL;FEATURE_SOCKET_DISPOSE;FEATURE_STREAM_APM;FEATURE_DNS_SYNC;FEATURE_THREAD_COUNTDOWNEVENT;FEATURE_THREAD_THREADPOOL;FEATURE_THREAD_SLEEP;FEATURE_WAITHANDLE_DISPOSE;FEATURE_HASH_MD5;FEATURE_HASH_SHA1_CREATE;FEATURE_HASH_SHA256_CREATE;FEATURE_HASH_SHA384_CREATE;FEATURE_HASH_SHA512_CREATE;FEATURE_HASH_RIPEMD160_CREATE;FEATURE_HMAC_MD5;FEATURE_HMAC_SHA1;FEATURE_HMAC_SHA256;FEATURE_HMAC_SHA384;FEATURE_HMAC_SHA512;FEATURE_HMAC_RIPEMD160;FEATURE_MEMORYSTREAM_GETBUFFER;FEATURE_DIAGNOSTICS_TRACESOURCE;FEATURE_ENCODING_ASCII;FEATURE_ECDSA</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
     <DocumentationFile>bin\Debug\Renci.SshNet.xml</DocumentationFile>
@@ -29,7 +29,7 @@
     <DebugType>none</DebugType>
     <Optimize>true</Optimize>
     <OutputPath>bin\Release\</OutputPath>
-    <DefineConstants>FEATURE_REGEX_COMPILE;FEATURE_BINARY_SERIALIZATION;FEATURE_RNG_CREATE;FEATURE_SOCKET_SYNC;FEATURE_SOCKET_EAP;FEATURE_SOCKET_APM;FEATURE_SOCKET_SETSOCKETOPTION;FEATURE_SOCKET_SELECT;FEATURE_SOCKET_POLL;FEATURE_SOCKET_DISPOSE;FEATURE_STREAM_APM;FEATURE_DNS_SYNC;FEATURE_THREAD_COUNTDOWNEVENT;FEATURE_THREAD_THREADPOOL;FEATURE_THREAD_SLEEP;FEATURE_WAITHANDLE_DISPOSE;FEATURE_HASH_MD5;FEATURE_HASH_SHA1_CREATE;FEATURE_HASH_SHA256_CREATE;FEATURE_HASH_SHA384_CREATE;FEATURE_HASH_SHA512_CREATE;FEATURE_HASH_RIPEMD160_CREATE;FEATURE_HMAC_MD5;FEATURE_HMAC_SHA1;FEATURE_HMAC_SHA256;FEATURE_HMAC_SHA384;FEATURE_HMAC_SHA512;FEATURE_HMAC_RIPEMD160;FEATURE_MEMORYSTREAM_GETBUFFER;FEATURE_DIAGNOSTICS_TRACESOURCE;FEATURE_ENCODING_ASCII</DefineConstants>
+    <DefineConstants>FEATURE_REGEX_COMPILE;FEATURE_BINARY_SERIALIZATION;FEATURE_RNG_CREATE;FEATURE_SOCKET_SYNC;FEATURE_SOCKET_EAP;FEATURE_SOCKET_APM;FEATURE_SOCKET_SETSOCKETOPTION;FEATURE_SOCKET_SELECT;FEATURE_SOCKET_POLL;FEATURE_SOCKET_DISPOSE;FEATURE_STREAM_APM;FEATURE_DNS_SYNC;FEATURE_THREAD_COUNTDOWNEVENT;FEATURE_THREAD_THREADPOOL;FEATURE_THREAD_SLEEP;FEATURE_WAITHANDLE_DISPOSE;FEATURE_HASH_MD5;FEATURE_HASH_SHA1_CREATE;FEATURE_HASH_SHA256_CREATE;FEATURE_HASH_SHA384_CREATE;FEATURE_HASH_SHA512_CREATE;FEATURE_HASH_RIPEMD160_CREATE;FEATURE_HMAC_MD5;FEATURE_HMAC_SHA1;FEATURE_HMAC_SHA256;FEATURE_HMAC_SHA384;FEATURE_HMAC_SHA512;FEATURE_HMAC_RIPEMD160;FEATURE_MEMORYSTREAM_GETBUFFER;FEATURE_DIAGNOSTICS_TRACESOURCE;FEATURE_ENCODING_ASCII;FEATURE_ECDSA</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
     <DocumentationFile>bin\Release\Renci.SshNet.xml</DocumentationFile>
@@ -164,10 +164,78 @@
     <Compile Include="Messages\Transport\KeyExchangeEcdhInitMessage.cs" />
     <Compile Include="Messages\Transport\KeyExchangeEcdhReplyMessage.cs" />
     <Compile Include="Netconf\INetConfSession.cs" />
+    <Compile Include="OpenSSHKeyReader.cs" />
     <Compile Include="RemotePathDoubleQuoteTransformation.cs" />
     <Compile Include="RemotePathNoneTransformation.cs" />
     <Compile Include="RemotePathShellQuoteTransformation.cs" />
     <Compile Include="RemotePathTransformation.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Array16.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Array8.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\ByteIntegerConverter.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\CryptoBytes.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\base.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\base2.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\d.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\d2.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\fe_0.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\fe_1.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\fe_add.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\fe_cmov.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\fe_cswap.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\fe_frombytes.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\fe_invert.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\fe_isnegative.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\fe_isnonzero.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\fe_mul.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\fe_mul121666.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\fe_neg.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\fe_pow22523.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\fe_sq.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\fe_sq2.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\fe_sub.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\fe_tobytes.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\FieldElement.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\ge_add.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\ge_double_scalarmult.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\ge_frombytes.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\ge_madd.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\ge_msub.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\ge_p1p1_to_p2.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\ge_p1p1_to_p3.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\ge_p2_0.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\ge_p2_dbl.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\ge_p3_0.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\ge_p3_dbl.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\ge_p3_tobytes.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\ge_p3_to_cached.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\ge_p3_to_p2.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\ge_precomp_0.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\ge_scalarmult_base.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\ge_sub.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\ge_tobytes.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\GroupElement.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\keypair.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\open.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\scalarmult.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\sc_clamp.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\sc_mul_add.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\sc_reduce.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\sign.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Ed25519Ref10\sqrtm1.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\InternalAssert.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\MontgomeryCurve25519.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Poly1305Donna.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Salsa\Salsa20.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Salsa\SalsaCore.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Sha512.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\Sha512Internal.cs" />
+    <Compile Include="Security\Cryptography\Ciphers\Ed255129\XSalsa20Poly1305.cs" />
+    <Compile Include="Security\Cryptography\ED25519DigitalSignature.cs" />
+    <Compile Include="Security\Cryptography\EcdsaDigitalSignature.cs" />
+    <Compile Include="Security\Cryptography\EcdsaKey.cs" />
+    <Compile Include="Security\Cryptography\ED25519Key.cs" />
     <Compile Include="Security\Cryptography\HMACMD5.cs" />
     <Compile Include="Security\Cryptography\HMACSHA1.cs" />
     <Compile Include="Security\Cryptography\HMACSHA256.cs" />
@@ -465,10 +533,14 @@
       <Link>Renci.SshNet.snk</Link>
     </None>
     <None Include="Documentation\Renci.SshNet.content" />
+    <None Include="Security\Cryptography\Ciphers\Ed255129\readme.md" />
   </ItemGroup>
   <ItemGroup>
     <Content Include="Documentation\SshNet.shfbproj" />
+    <Content Include="Security\Cryptography\Ciphers\Ed255129\License.txt" />
+    <Content Include="Security\Cryptography\Ciphers\Ed255129\Salsa\replace regex.txt" />
   </ItemGroup>
+  <ItemGroup />
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
        Other similar extension points exist, see Microsoft.Common.targets.
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129.cs
new file mode 100644
index 000000000..24cd4752e
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129.cs
@@ -0,0 +1,149 @@
+using Chaos.NaCl;
+using Chaos.NaCl.Internal.Ed25519Ref10;
+using System;
+#pragma warning disable CS1591 // Fehledes XML-Kommentar für öffentlich sichtbaren Typ oder Element
+namespace Renci.SshNet.Security.Cryptography.Ciphers
+{
+    public class Ed25519
+    {
+        public static readonly int PublicKeySizeInBytes = 32;
+        public static readonly int SignatureSizeInBytes = 64;
+        public static readonly int ExpandedPrivateKeySizeInBytes = 32 * 2;
+        public static readonly int PrivateKeySeedSizeInBytes = 32;
+        public static readonly int SharedKeySizeInBytes = 32;
+
+        public static bool Verify(ArraySegment<byte> signature, ArraySegment<byte> message, ArraySegment<byte> publicKey)
+        {
+            if (signature.Count != SignatureSizeInBytes)
+                throw new ArgumentException(string.Format("Signature size must be {0}", SignatureSizeInBytes), "signature.Count");
+            if (publicKey.Count != PublicKeySizeInBytes)
+                throw new ArgumentException(string.Format("Public key size must be {0}", PublicKeySizeInBytes), "publicKey.Count");
+            return Ed25519Operations.crypto_sign_verify(signature.Array, signature.Offset, message.Array, message.Offset, message.Count, publicKey.Array, publicKey.Offset);
+        }
+
+        public static bool Verify(byte[] signature, byte[] message, byte[] publicKey)
+        {
+            if (signature == null)
+                throw new ArgumentNullException("signature");
+            if (message == null)
+                throw new ArgumentNullException("message");
+            if (publicKey == null)
+                throw new ArgumentNullException("publicKey");
+            if (signature.Length != SignatureSizeInBytes)
+                throw new ArgumentException(string.Format("Signature size must be {0}", SignatureSizeInBytes), "signature.Length");
+            if (publicKey.Length != PublicKeySizeInBytes)
+                throw new ArgumentException(string.Format("Public key size must be {0}", PublicKeySizeInBytes), "publicKey.Length");
+            return Ed25519Operations.crypto_sign_verify(signature, 0, message, 0, message.Length, publicKey, 0);
+        }
+
+        public static void Sign(ArraySegment<byte> signature, ArraySegment<byte> message, ArraySegment<byte> expandedPrivateKey)
+        {
+            if (signature.Array == null)
+                throw new ArgumentNullException("signature.Array");
+            if (signature.Count != SignatureSizeInBytes)
+                throw new ArgumentException("signature.Count");
+            if (expandedPrivateKey.Array == null)
+                throw new ArgumentNullException("expandedPrivateKey.Array");
+            if (expandedPrivateKey.Count != ExpandedPrivateKeySizeInBytes)
+                throw new ArgumentException("expandedPrivateKey.Count");
+            if (message.Array == null)
+                throw new ArgumentNullException("message.Array");
+            Ed25519Operations.crypto_sign2(signature.Array, signature.Offset, message.Array, message.Offset, message.Count, expandedPrivateKey.Array, expandedPrivateKey.Offset);
+        }
+
+        public static byte[] Sign(byte[] message, byte[] expandedPrivateKey)
+        {
+            var signature = new byte[SignatureSizeInBytes];
+            Sign(new ArraySegment<byte>(signature), new ArraySegment<byte>(message), new ArraySegment<byte>(expandedPrivateKey));
+            return signature;
+        }
+
+        public static byte[] PublicKeyFromSeed(byte[] privateKeySeed)
+        {
+            byte[] privateKey;
+            byte[] publicKey;
+            KeyPairFromSeed(out publicKey, out privateKey, privateKeySeed);
+            CryptoBytes.Wipe(privateKey);
+            return publicKey;
+        }
+
+        public static byte[] ExpandedPrivateKeyFromSeed(byte[] privateKeySeed)
+        {
+            byte[] privateKey;
+            byte[] publicKey;
+            KeyPairFromSeed(out publicKey, out privateKey, privateKeySeed);
+            CryptoBytes.Wipe(publicKey);
+            return privateKey;
+        }
+
+        public static void KeyPairFromSeed(out byte[] publicKey, out byte[] expandedPrivateKey, byte[] privateKeySeed)
+        {
+            if (privateKeySeed == null)
+                throw new ArgumentNullException("privateKeySeed");
+            if (privateKeySeed.Length != PrivateKeySeedSizeInBytes)
+                throw new ArgumentException("privateKeySeed");
+            var pk = new byte[PublicKeySizeInBytes];
+            var sk = new byte[ExpandedPrivateKeySizeInBytes];
+            Ed25519Operations.crypto_sign_keypair(pk, 0, sk, 0, privateKeySeed, 0);
+            publicKey = pk;
+            expandedPrivateKey = sk;
+        }
+
+        public static void KeyPairFromSeed(ArraySegment<byte> publicKey, ArraySegment<byte> expandedPrivateKey, ArraySegment<byte> privateKeySeed)
+        {
+            if (publicKey.Array == null)
+                throw new ArgumentNullException("publicKey.Array");
+            if (expandedPrivateKey.Array == null)
+                throw new ArgumentNullException("expandedPrivateKey.Array");
+            if (privateKeySeed.Array == null)
+                throw new ArgumentNullException("privateKeySeed.Array");
+            if (publicKey.Count != PublicKeySizeInBytes)
+                throw new ArgumentException("publicKey.Count");
+            if (expandedPrivateKey.Count != ExpandedPrivateKeySizeInBytes)
+                throw new ArgumentException("expandedPrivateKey.Count");
+            if (privateKeySeed.Count != PrivateKeySeedSizeInBytes)
+                throw new ArgumentException("privateKeySeed.Count");
+            Ed25519Operations.crypto_sign_keypair(
+                publicKey.Array, publicKey.Offset,
+                expandedPrivateKey.Array, expandedPrivateKey.Offset,
+                privateKeySeed.Array, privateKeySeed.Offset);
+        }
+
+        [Obsolete("Needs more testing")]
+        public static byte[] KeyExchange(byte[] publicKey, byte[] privateKey)
+        {
+            var sharedKey = new byte[SharedKeySizeInBytes];
+            KeyExchange(new ArraySegment<byte>(sharedKey), new ArraySegment<byte>(publicKey), new ArraySegment<byte>(privateKey));
+            return sharedKey;
+        }
+
+        [Obsolete("Needs more testing")]
+        public static void KeyExchange(ArraySegment<byte> sharedKey, ArraySegment<byte> publicKey, ArraySegment<byte> privateKey)
+        {
+            if (sharedKey.Array == null)
+                throw new ArgumentNullException("sharedKey.Array");
+            if (publicKey.Array == null)
+                throw new ArgumentNullException("publicKey.Array");
+            if (privateKey.Array == null)
+                throw new ArgumentNullException("privateKey");
+            if (sharedKey.Count != 32)
+                throw new ArgumentException("sharedKey.Count != 32");
+            if (publicKey.Count != 32)
+                throw new ArgumentException("publicKey.Count != 32");
+            if (privateKey.Count != 64)
+                throw new ArgumentException("privateKey.Count != 64");
+
+            FieldElement montgomeryX, edwardsY, edwardsZ, sharedMontgomeryX;
+            FieldOperations.fe_frombytes(out edwardsY, publicKey.Array, publicKey.Offset);
+            FieldOperations.fe_1(out edwardsZ);
+            MontgomeryCurve25519.EdwardsToMontgomeryX(out montgomeryX, ref edwardsY, ref edwardsZ);
+            byte[] h = Sha512.Hash(privateKey.Array, privateKey.Offset, 32);//ToDo: Remove alloc
+            ScalarOperations.sc_clamp(h, 0);
+            MontgomeryOperations.scalarmult(out sharedMontgomeryX, h, 0, ref montgomeryX);
+            CryptoBytes.Wipe(h);
+            FieldOperations.fe_tobytes(sharedKey.Array, sharedKey.Offset, ref sharedMontgomeryX);
+            MontgomeryCurve25519.KeyExchangeOutputHashNaCl(sharedKey.Array, sharedKey.Offset);
+        }
+    }
+}
+#pragma warning restore CS1591 // Fehledes XML-Kommentar für öffentlich sichtbaren Typ oder Element
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Array16.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Array16.cs
new file mode 100644
index 000000000..082bf061d
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Array16.cs
@@ -0,0 +1,27 @@
+using System;
+using System.Collections.Generic;
+
+namespace Chaos.NaCl.Internal
+{
+    // Array16<UInt32> Salsa20 state
+    // Array16<UInt64> SHA-512 block
+    internal struct Array16<T>
+    {
+        public T x0;
+        public T x1;
+        public T x2;
+        public T x3;
+        public T x4;
+        public T x5;
+        public T x6;
+        public T x7;
+        public T x8;
+        public T x9;
+        public T x10;
+        public T x11;
+        public T x12;
+        public T x13;
+        public T x14;
+        public T x15;
+    }
+}
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Array8.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Array8.cs
new file mode 100644
index 000000000..f3bc50dd6
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Array8.cs
@@ -0,0 +1,18 @@
+using System;
+
+namespace Chaos.NaCl.Internal
+{
+    // Array8<UInt32> Poly1305 key
+    // Array8<UInt64> SHA-512 state/output
+    internal struct Array8<T>
+    {
+        public T x0;
+        public T x1;
+        public T x2;
+        public T x3;
+        public T x4;
+        public T x5;
+        public T x6;
+        public T x7;
+    }
+}
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/ByteIntegerConverter.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/ByteIntegerConverter.cs
new file mode 100644
index 000000000..c90aa5b16
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/ByteIntegerConverter.cs
@@ -0,0 +1,416 @@
+using System;
+using System.Collections.Generic;
+
+namespace Chaos.NaCl.Internal
+{
+    // Loops? Arrays? Never heard of that stuff
+    // Library avoids unnecessary heap allocations and unsafe code
+    // so this ugly code becomes necessary :(
+    internal static class ByteIntegerConverter
+    {
+        #region Individual
+
+        public static UInt32 LoadLittleEndian32(byte[] buf, int offset)
+        {
+            return
+                (UInt32)(buf[offset + 0])
+            | (((UInt32)(buf[offset + 1])) << 8)
+            | (((UInt32)(buf[offset + 2])) << 16)
+            | (((UInt32)(buf[offset + 3])) << 24);
+        }
+
+        public static void StoreLittleEndian32(byte[] buf, int offset, UInt32 value)
+        {
+            buf[offset + 0] = unchecked((byte)value);
+            buf[offset + 1] = unchecked((byte)(value >> 8));
+            buf[offset + 2] = unchecked((byte)(value >> 16));
+            buf[offset + 3] = unchecked((byte)(value >> 24));
+        }
+
+        public static UInt64 LoadBigEndian64(byte[] buf, int offset)
+        {
+            return
+                (UInt64)(buf[offset + 7])
+                | (((UInt64)(buf[offset + 6])) << 8)
+                | (((UInt64)(buf[offset + 5])) << 16)
+                | (((UInt64)(buf[offset + 4])) << 24)
+                | (((UInt64)(buf[offset + 3])) << 32)
+                | (((UInt64)(buf[offset + 2])) << 40)
+                | (((UInt64)(buf[offset + 1])) << 48)
+                | (((UInt64)(buf[offset + 0])) << 56);
+        }
+
+        public static void StoreBigEndian64(byte[] buf, int offset, UInt64 value)
+        {
+            buf[offset + 7] = unchecked((byte)value);
+            buf[offset + 6] = unchecked((byte)(value >> 8));
+            buf[offset + 5] = unchecked((byte)(value >> 16));
+            buf[offset + 4] = unchecked((byte)(value >> 24));
+            buf[offset + 3] = unchecked((byte)(value >> 32));
+            buf[offset + 2] = unchecked((byte)(value >> 40));
+            buf[offset + 1] = unchecked((byte)(value >> 48));
+            buf[offset + 0] = unchecked((byte)(value >> 56));
+        }
+
+        /*public static void XorLittleEndian32(byte[] buf, int offset, UInt32 value)
+        {
+            buf[offset + 0] ^= (byte)value;
+            buf[offset + 1] ^= (byte)(value >> 8);
+            buf[offset + 2] ^= (byte)(value >> 16);
+            buf[offset + 3] ^= (byte)(value >> 24);
+        }*/
+
+        /*public static void XorLittleEndian32(byte[] output, int outputOffset, byte[] input, int inputOffset, UInt32 value)
+        {
+            output[outputOffset + 0] = (byte)(input[inputOffset + 0] ^ value);
+            output[outputOffset + 1] = (byte)(input[inputOffset + 1] ^ (value >> 8));
+            output[outputOffset + 2] = (byte)(input[inputOffset + 2] ^ (value >> 16));
+            output[outputOffset + 3] = (byte)(input[inputOffset + 3] ^ (value >> 24));
+        }*/
+
+        #endregion
+
+        #region Array8
+
+        public static void Array8LoadLittleEndian32(out Array8<UInt32> output, byte[] input, int inputOffset)
+        {
+            output.x0 = LoadLittleEndian32(input, inputOffset + 0);
+            output.x1 = LoadLittleEndian32(input, inputOffset + 4);
+            output.x2 = LoadLittleEndian32(input, inputOffset + 8);
+            output.x3 = LoadLittleEndian32(input, inputOffset + 12);
+            output.x4 = LoadLittleEndian32(input, inputOffset + 16);
+            output.x5 = LoadLittleEndian32(input, inputOffset + 20);
+            output.x6 = LoadLittleEndian32(input, inputOffset + 24);
+            output.x7 = LoadLittleEndian32(input, inputOffset + 28);
+        }
+
+        /*        public static void Array8LoadLittleEndian32(out Array8<uint> output, byte[] input, int inputOffset, int inputLength)
+                {
+        #if DEBUG
+                    if (inputLength <= 0)
+                        throw new ArgumentException();
+        #endif
+                    int inputEnd = inputOffset + inputLength;
+                    UInt32 highestInt;
+                    switch (inputLength & 3)
+                    {
+                        case 1:
+                            highestInt = input[inputEnd - 1];
+                            break;
+                        case 2:
+                            highestInt = (uint)(
+                                (input[inputEnd - 1] << 8) |
+                                (input[inputEnd - 2]));
+                            break;
+                        case 3:
+                            highestInt = (uint)(
+                                (input[inputEnd - 1] << 16) |
+                                (input[inputEnd - 2] << 8) |
+                                (input[inputEnd - 3]));
+                            break;
+                        case 0:
+                            highestInt = (uint)(
+                                (input[inputEnd - 1] << 24) |
+                                (input[inputEnd - 2] << 16) |
+                                (input[inputEnd - 3] << 8) |
+                                (input[inputEnd - 4]));
+                            break;
+                        default:
+                            throw new InvalidOperationException();
+                    }
+                    switch ((inputLength - 1) >> 2)
+                    {
+                        case 7:
+                            output.x7 = highestInt;
+                            output.x6 = LoadLittleEndian32(input, inputOffset + 6 * 4);
+                            output.x5 = LoadLittleEndian32(input, inputOffset + 5 * 4);
+                            output.x4 = LoadLittleEndian32(input, inputOffset + 4 * 4);
+                            output.x3 = LoadLittleEndian32(input, inputOffset + 3 * 4);
+                            output.x2 = LoadLittleEndian32(input, inputOffset + 2 * 4);
+                            output.x1 = LoadLittleEndian32(input, inputOffset + 1 * 4);
+                            output.x0 = LoadLittleEndian32(input, inputOffset + 0 * 4);
+                            return;
+                        case 6:
+                            output.x7 = 0;
+                            output.x6 = highestInt;
+                            output.x5 = LoadLittleEndian32(input, inputOffset + 5 * 4);
+                            output.x4 = LoadLittleEndian32(input, inputOffset + 4 * 4);
+                            output.x3 = LoadLittleEndian32(input, inputOffset + 3 * 4);
+                            output.x2 = LoadLittleEndian32(input, inputOffset + 2 * 4);
+                            output.x1 = LoadLittleEndian32(input, inputOffset + 1 * 4);
+                            output.x0 = LoadLittleEndian32(input, inputOffset + 0 * 4);
+                            return;
+                        case 5:
+                            output.x7 = 0;
+                            output.x6 = 0;
+                            output.x5 = highestInt;
+                            output.x4 = LoadLittleEndian32(input, inputOffset + 4 * 4);
+                            output.x3 = LoadLittleEndian32(input, inputOffset + 3 * 4);
+                            output.x2 = LoadLittleEndian32(input, inputOffset + 2 * 4);
+                            output.x1 = LoadLittleEndian32(input, inputOffset + 1 * 4);
+                            output.x0 = LoadLittleEndian32(input, inputOffset + 0 * 4);
+                            return;
+                        case 4:
+                            output.x7 = 0;
+                            output.x6 = 0;
+                            output.x5 = 0;
+                            output.x4 = highestInt;
+                            output.x3 = LoadLittleEndian32(input, inputOffset + 3 * 4);
+                            output.x2 = LoadLittleEndian32(input, inputOffset + 2 * 4);
+                            output.x1 = LoadLittleEndian32(input, inputOffset + 1 * 4);
+                            output.x0 = LoadLittleEndian32(input, inputOffset + 0 * 4);
+                            return;
+                        case 3:
+                            output.x7 = 0;
+                            output.x6 = 0;
+                            output.x5 = 0;
+                            output.x4 = 0;
+                            output.x3 = highestInt;
+                            output.x2 = LoadLittleEndian32(input, inputOffset + 2 * 4);
+                            output.x1 = LoadLittleEndian32(input, inputOffset + 1 * 4);
+                            output.x0 = LoadLittleEndian32(input, inputOffset + 0 * 4);
+                            return;
+                        case 2:
+                            output.x7 = 0;
+                            output.x6 = 0;
+                            output.x5 = 0;
+                            output.x4 = 0;
+                            output.x3 = 0;
+                            output.x2 = highestInt;
+                            output.x1 = LoadLittleEndian32(input, inputOffset + 1 * 4);
+                            output.x0 = LoadLittleEndian32(input, inputOffset + 0 * 4);
+                            return;
+                        case 1:
+                            output.x7 = 0;
+                            output.x6 = 0;
+                            output.x5 = 0;
+                            output.x4 = 0;
+                            output.x3 = 0;
+                            output.x2 = 0;
+                            output.x1 = highestInt;
+                            output.x0 = LoadLittleEndian32(input, inputOffset + 0 * 4);
+                            return;
+                        case 0:
+                            output.x7 = 0;
+                            output.x6 = 0;
+                            output.x5 = 0;
+                            output.x4 = 0;
+                            output.x3 = 0;
+                            output.x2 = 0;
+                            output.x1 = 0;
+                            output.x0 = highestInt;
+                            return;
+                        default:
+                            throw new InvalidOperationException();
+                    }
+                }*/
+
+        /*public static void Array8XorLittleEndian(byte[] output, int outputOffset, byte[] input, int inputOffset, ref Array8<uint> keyStream, int length)
+        {
+#if DEBUG
+            InternalAssert(length > 0);
+#endif
+            int outputEnd = outputOffset + length;
+            UInt32 highestInt;
+            switch ((length - 1) >> 2)
+            {
+                case 7:
+                    highestInt = keyStream.x7;
+                    XorLittleEndian32(output, outputOffset + 6 * 4, input, inputOffset + 6 * 4, keyStream.x6);
+                    XorLittleEndian32(output, outputOffset + 5 * 4, input, inputOffset + 6 * 4, keyStream.x5);
+                    XorLittleEndian32(output, outputOffset + 4 * 4, input, inputOffset + 6 * 4, keyStream.x4);
+                    XorLittleEndian32(output, outputOffset + 3 * 4, input, inputOffset + 6 * 4, keyStream.x3);
+                    XorLittleEndian32(output, outputOffset + 2 * 4, input, inputOffset + 6 * 4, keyStream.x2);
+                    XorLittleEndian32(output, outputOffset + 1 * 4, input, inputOffset + 6 * 4, keyStream.x1);
+                    XorLittleEndian32(output, outputOffset + 0 * 4, input, inputOffset + 6 * 4, keyStream.x0);
+                    break;
+                case 6:
+                    highestInt = keyStream.x6;
+                    XorLittleEndian32(output, outputOffset + 5 * 4, input, inputOffset + 6 * 4, keyStream.x5);
+                    XorLittleEndian32(output, outputOffset + 4 * 4, input, inputOffset + 6 * 4, keyStream.x4);
+                    XorLittleEndian32(output, outputOffset + 3 * 4, input, inputOffset + 6 * 4, keyStream.x3);
+                    XorLittleEndian32(output, outputOffset + 2 * 4, input, inputOffset + 6 * 4, keyStream.x2);
+                    XorLittleEndian32(output, outputOffset + 1 * 4, input, inputOffset + 6 * 4, keyStream.x1);
+                    XorLittleEndian32(output, outputOffset + 0 * 4, input, inputOffset + 6 * 4, keyStream.x0);
+                    break;
+                case 5:
+                    highestInt = keyStream.x5;
+                    XorLittleEndian32(output, outputOffset + 4 * 4, input, inputOffset + 6 * 4, keyStream.x4);
+                    XorLittleEndian32(output, outputOffset + 3 * 4, input, inputOffset + 6 * 4, keyStream.x3);
+                    XorLittleEndian32(output, outputOffset + 2 * 4, input, inputOffset + 6 * 4, keyStream.x2);
+                    XorLittleEndian32(output, outputOffset + 1 * 4, input, inputOffset + 6 * 4, keyStream.x1);
+                    XorLittleEndian32(output, outputOffset + 0 * 4, input, inputOffset + 6 * 4, keyStream.x0);
+                    break;
+                case 4:
+                    highestInt = keyStream.x4;
+                    XorLittleEndian32(output, outputOffset + 3 * 4, input, inputOffset + 6 * 4, keyStream.x3);
+                    XorLittleEndian32(output, outputOffset + 2 * 4, input, inputOffset + 6 * 4, keyStream.x2);
+                    XorLittleEndian32(output, outputOffset + 1 * 4, input, inputOffset + 6 * 4, keyStream.x1);
+                    XorLittleEndian32(output, outputOffset + 0 * 4, input, inputOffset + 6 * 4, keyStream.x0);
+                    break;
+                case 3:
+                    highestInt = keyStream.x3;
+                    XorLittleEndian32(output, outputOffset + 2 * 4, input, inputOffset + 6 * 4, keyStream.x2);
+                    XorLittleEndian32(output, outputOffset + 1 * 4, input, inputOffset + 6 * 4, keyStream.x1);
+                    XorLittleEndian32(output, outputOffset + 0 * 4, input, inputOffset + 6 * 4, keyStream.x0);
+                    break;
+                case 2:
+                    highestInt = keyStream.x2;
+                    XorLittleEndian32(output, outputOffset + 1 * 4, input, inputOffset + 6 * 4, keyStream.x1);
+                    XorLittleEndian32(output, outputOffset + 0 * 4, input, inputOffset + 6 * 4, keyStream.x0);
+                    break;
+                case 1:
+                    highestInt = keyStream.x1;
+                    XorLittleEndian32(output, outputOffset + 0 * 4, input, inputOffset + 6 * 4, keyStream.x0);
+                    break;
+                case 0:
+                    highestInt = keyStream.x0;
+                    break;
+                default:
+                    throw new InvalidOperationException();
+            }
+            switch (length & 3)
+            {
+                case 1:
+                    output[outputEnd - 1] ^= (byte)highestInt;
+                    break;
+                case 2:
+                    output[outputEnd - 1] ^= (byte)(highestInt >> 8);
+                    output[outputEnd - 2] ^= (byte)highestInt;
+                    break;
+                case 3:
+                    output[outputEnd - 1] ^= (byte)(highestInt >> 16);
+                    output[outputEnd - 2] ^= (byte)(highestInt >> 8);
+                    output[outputEnd - 3] ^= (byte)highestInt;
+                    break;
+                case 0:
+                    output[outputEnd - 1] ^= (byte)(highestInt >> 24);
+                    output[outputEnd - 2] ^= (byte)(highestInt >> 16);
+                    output[outputEnd - 3] ^= (byte)(highestInt >> 8);
+                    output[outputEnd - 4] ^= (byte)highestInt;
+                    break;
+                default:
+                    throw new InvalidOperationException();
+            }
+        }*/
+
+        /*public static void Array8StoreLittleEndian32(byte[] output, int outputOffset, ref Array8<uint> input)
+        {
+            StoreLittleEndian32(output, outputOffset + 0, input.x0);
+            StoreLittleEndian32(output, outputOffset + 4, input.x1);
+            StoreLittleEndian32(output, outputOffset + 8, input.x2);
+            StoreLittleEndian32(output, outputOffset + 12, input.x3);
+            StoreLittleEndian32(output, outputOffset + 16, input.x4);
+            StoreLittleEndian32(output, outputOffset + 20, input.x5);
+            StoreLittleEndian32(output, outputOffset + 24, input.x6);
+            StoreLittleEndian32(output, outputOffset + 28, input.x7);
+        }*/
+        #endregion
+
+        public static void Array16LoadBigEndian64(out Array16<UInt64> output, byte[] input, int inputOffset)
+        {
+            output.x0 = LoadBigEndian64(input, inputOffset + 0);
+            output.x1 = LoadBigEndian64(input, inputOffset + 8);
+            output.x2 = LoadBigEndian64(input, inputOffset + 16);
+            output.x3 = LoadBigEndian64(input, inputOffset + 24);
+            output.x4 = LoadBigEndian64(input, inputOffset + 32);
+            output.x5 = LoadBigEndian64(input, inputOffset + 40);
+            output.x6 = LoadBigEndian64(input, inputOffset + 48);
+            output.x7 = LoadBigEndian64(input, inputOffset + 56);
+            output.x8 = LoadBigEndian64(input, inputOffset + 64);
+            output.x9 = LoadBigEndian64(input, inputOffset + 72);
+            output.x10 = LoadBigEndian64(input, inputOffset + 80);
+            output.x11 = LoadBigEndian64(input, inputOffset + 88);
+            output.x12 = LoadBigEndian64(input, inputOffset + 96);
+            output.x13 = LoadBigEndian64(input, inputOffset + 104);
+            output.x14 = LoadBigEndian64(input, inputOffset + 112);
+            output.x15 = LoadBigEndian64(input, inputOffset + 120);
+        }
+
+        // ToDo: Only used in tests. Remove?
+        public static void Array16LoadLittleEndian32(out Array16<UInt32> output, byte[] input, int inputOffset)
+        {
+            output.x0 = LoadLittleEndian32(input, inputOffset + 0);
+            output.x1 = LoadLittleEndian32(input, inputOffset + 4);
+            output.x2 = LoadLittleEndian32(input, inputOffset + 8);
+            output.x3 = LoadLittleEndian32(input, inputOffset + 12);
+            output.x4 = LoadLittleEndian32(input, inputOffset + 16);
+            output.x5 = LoadLittleEndian32(input, inputOffset + 20);
+            output.x6 = LoadLittleEndian32(input, inputOffset + 24);
+            output.x7 = LoadLittleEndian32(input, inputOffset + 28);
+            output.x8 = LoadLittleEndian32(input, inputOffset + 32);
+            output.x9 = LoadLittleEndian32(input, inputOffset + 36);
+            output.x10 = LoadLittleEndian32(input, inputOffset + 40);
+            output.x11 = LoadLittleEndian32(input, inputOffset + 44);
+            output.x12 = LoadLittleEndian32(input, inputOffset + 48);
+            output.x13 = LoadLittleEndian32(input, inputOffset + 52);
+            output.x14 = LoadLittleEndian32(input, inputOffset + 56);
+            output.x15 = LoadLittleEndian32(input, inputOffset + 60);
+        }
+
+        /*public static void Array16LoadLittleEndian32(out Array16<UInt32> output, byte[] input, int inputOffset, int inputLength)
+        {
+            Array8<UInt32> temp;
+            if (inputLength > 32)
+            {
+                output.x0 = LoadLittleEndian32(input, inputOffset + 0);
+                output.x1 = LoadLittleEndian32(input, inputOffset + 4);
+                output.x2 = LoadLittleEndian32(input, inputOffset + 8);
+                output.x3 = LoadLittleEndian32(input, inputOffset + 12);
+                output.x4 = LoadLittleEndian32(input, inputOffset + 16);
+                output.x5 = LoadLittleEndian32(input, inputOffset + 20);
+                output.x6 = LoadLittleEndian32(input, inputOffset + 24);
+                output.x7 = LoadLittleEndian32(input, inputOffset + 28);
+                Array8LoadLittleEndian32(out temp, input, inputOffset + 32, inputLength - 32);
+                output.x8 = temp.x0;
+                output.x9 = temp.x1;
+                output.x10 = temp.x2;
+                output.x11 = temp.x3;
+                output.x12 = temp.x4;
+                output.x13 = temp.x5;
+                output.x14 = temp.x6;
+                output.x15 = temp.x7;
+            }
+            else
+            {
+                Array8LoadLittleEndian32(out temp, input, inputOffset, inputLength);
+                output.x0 = temp.x0;
+                output.x1 = temp.x1;
+                output.x2 = temp.x2;
+                output.x3 = temp.x3;
+                output.x4 = temp.x4;
+                output.x5 = temp.x5;
+                output.x6 = temp.x6;
+                output.x7 = temp.x7;
+                output.x8 = 0;
+                output.x9 = 0;
+                output.x10 = 0;
+                output.x11 = 0;
+                output.x12 = 0;
+                output.x13 = 0;
+                output.x14 = 0;
+                output.x15 = 0;
+            }
+        }*/
+
+        public static void Array16StoreLittleEndian32(byte[] output, int outputOffset, ref Array16<UInt32> input)
+        {
+            StoreLittleEndian32(output, outputOffset + 0, input.x0);
+            StoreLittleEndian32(output, outputOffset + 4, input.x1);
+            StoreLittleEndian32(output, outputOffset + 8, input.x2);
+            StoreLittleEndian32(output, outputOffset + 12, input.x3);
+            StoreLittleEndian32(output, outputOffset + 16, input.x4);
+            StoreLittleEndian32(output, outputOffset + 20, input.x5);
+            StoreLittleEndian32(output, outputOffset + 24, input.x6);
+            StoreLittleEndian32(output, outputOffset + 28, input.x7);
+            StoreLittleEndian32(output, outputOffset + 32, input.x8);
+            StoreLittleEndian32(output, outputOffset + 36, input.x9);
+            StoreLittleEndian32(output, outputOffset + 40, input.x10);
+            StoreLittleEndian32(output, outputOffset + 44, input.x11);
+            StoreLittleEndian32(output, outputOffset + 48, input.x12);
+            StoreLittleEndian32(output, outputOffset + 52, input.x13);
+            StoreLittleEndian32(output, outputOffset + 56, input.x14);
+            StoreLittleEndian32(output, outputOffset + 60, input.x15);
+        }
+    }
+}
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/CryptoBytes.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/CryptoBytes.cs
new file mode 100644
index 000000000..7655bf88c
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/CryptoBytes.cs
@@ -0,0 +1,192 @@
+#pragma warning disable CS1591 // Fehledes XML-Kommentar für öffentlich sichtbaren Typ oder Element
+using System;
+using System.Runtime.CompilerServices;
+
+namespace Chaos.NaCl
+{
+    public static class CryptoBytes
+    {
+        public static bool ConstantTimeEquals(byte[] x, byte[] y)
+        {
+            if (x == null)
+                throw new ArgumentNullException("x");
+            if (y == null)
+                throw new ArgumentNullException("y");
+            if (x.Length != y.Length)
+                throw new ArgumentException("x.Length must equal y.Length");
+            return InternalConstantTimeEquals(x, 0, y, 0, x.Length) != 0;
+        }
+
+        public static bool ConstantTimeEquals(ArraySegment<byte> x, ArraySegment<byte> y)
+        {
+            if (x.Array == null)
+                throw new ArgumentNullException("x.Array");
+            if (y.Array == null)
+                throw new ArgumentNullException("y.Array");
+            if (x.Count != y.Count)
+                throw new ArgumentException("x.Count must equal y.Count");
+
+            return InternalConstantTimeEquals(x.Array, x.Offset, y.Array, y.Offset, x.Count) != 0;
+        }
+
+        public static bool ConstantTimeEquals(byte[] x, int xOffset, byte[] y, int yOffset, int length)
+        {
+            if (x == null)
+                throw new ArgumentNullException("x");
+            if (xOffset < 0)
+                throw new ArgumentOutOfRangeException("xOffset", "xOffset < 0");
+            if (y == null)
+                throw new ArgumentNullException("y");
+            if (yOffset < 0)
+                throw new ArgumentOutOfRangeException("yOffset", "yOffset < 0");
+            if (length < 0)
+                throw new ArgumentOutOfRangeException("length", "length < 0");
+            if (x.Length - xOffset < length)
+                throw new ArgumentException("xOffset + length > x.Length");
+            if (y.Length - yOffset < length)
+                throw new ArgumentException("yOffset + length > y.Length");
+
+            return InternalConstantTimeEquals(x, xOffset, y, yOffset, length) != 0;
+        }
+
+        private static uint InternalConstantTimeEquals(byte[] x, int xOffset, byte[] y, int yOffset, int length)
+        {
+            int differentbits = 0;
+            for (int i = 0; i < length; i++)
+                differentbits |= x[xOffset + i] ^ y[yOffset + i];
+            return (1 & (unchecked((uint)differentbits - 1) >> 8));
+        }
+
+        public static void Wipe(byte[] data)
+        {
+            if (data == null)
+                throw new ArgumentNullException("data");
+            InternalWipe(data, 0, data.Length);
+        }
+
+        public static void Wipe(byte[] data, int offset, int count)
+        {
+            if (data == null)
+                throw new ArgumentNullException("data");
+            if (offset < 0)
+                throw new ArgumentOutOfRangeException("offset");
+            if (count < 0)
+                throw new ArgumentOutOfRangeException("count", "Requires count >= 0");
+            if ((uint)offset + (uint)count > (uint)data.Length)
+                throw new ArgumentException("Requires offset + count <= data.Length");
+            InternalWipe(data, offset, count);
+        }
+
+        public static void Wipe(ArraySegment<byte> data)
+        {
+            if (data.Array == null)
+                throw new ArgumentNullException("data.Array");
+            InternalWipe(data.Array, data.Offset, data.Count);
+        }
+
+        // Secure wiping is hard
+        // * the GC can move around and copy memory
+        //   Perhaps this can be avoided by using unmanaged memory or by fixing the position of the array in memory
+        // * Swap files and error dumps can contain secret information
+        //   It seems possible to lock memory in RAM, no idea about error dumps
+        // * Compiler could optimize out the wiping if it knows that data won't be read back
+        //   I hope this is enough, suppressing inlining
+        //   but perhaps `RtlSecureZeroMemory` is needed
+        [MethodImpl(MethodImplOptions.NoInlining)]
+        internal static void InternalWipe(byte[] data, int offset, int count)
+        {
+            Array.Clear(data, offset, count);
+        }
+
+        // shallow wipe of structs
+        [MethodImpl(MethodImplOptions.NoInlining)]
+        internal static void InternalWipe<T>(ref T data)
+            where T : struct
+        {
+            data = default(T);
+        }
+
+        // constant time hex conversion
+        // see http://stackoverflow.com/a/14333437/445517
+        //
+        // An explanation of the weird bit fiddling:
+        //
+        // 1. `bytes[i] >> 4` extracts the high nibble of a byte  
+        //   `bytes[i] & 0xF` extracts the low nibble of a byte
+        // 2. `b - 10`  
+        //    is `< 0` for values `b < 10`, which will become a decimal digit  
+        //    is `>= 0` for values `b > 10`, which will become a letter from `A` to `F`.
+        // 3. Using `i >> 31` on a signed 32 bit integer extracts the sign, thanks to sign extension.
+        //    It will be `-1` for `i < 0` and `0` for `i >= 0`.
+        // 4. Combining 2) and 3), shows that `(b-10)>>31` will be `0` for letters and `-1` for digits.
+        // 5. Looking at the case for letters, the last summand becomes `0`, and `b` is in the range 10 to 15. We want to map it to `A`(65) to `F`(70), which implies adding 55 (`'A'-10`).
+        // 6. Looking at the case for digits, we want to adapt the last summand so it maps `b` from the range 0 to 9 to the range `0`(48) to `9`(57). This means it needs to become -7 (`'0' - 55`).  
+        // Now we could just multiply with 7. But since -1 is represented by all bits being 1, we can instead use `& -7` since `(0 & -7) == 0` and `(-1 & -7) == -7`.
+        //
+        // Some further considerations:
+        //
+        // * I didn't use a second loop variable to index into `c`, since measurement shows that calculating it from `i` is cheaper. 
+        // * Using exactly `i < bytes.Length` as upper bound of the loop allows the JITter to eliminate bounds checks on `bytes[i]`, so I chose that variant.
+        // * Making `b` an int avoids unnecessary conversions from and to byte.
+        public static string ToHexStringUpper(byte[] data)
+        {
+            if (data == null)
+                return null;
+            char[] c = new char[data.Length * 2];
+            int b;
+            for (int i = 0; i < data.Length; i++)
+            {
+                b = data[i] >> 4;
+                c[i * 2] = (char)(55 + b + (((b - 10) >> 31) & -7));
+                b = data[i] & 0xF;
+                c[i * 2 + 1] = (char)(55 + b + (((b - 10) >> 31) & -7));
+            }
+            return new string(c);
+        }
+
+        // Explanation is similar to ToHexStringUpper
+        // constant 55 -> 87 and -7 -> -39 to compensate for the offset 32 between lowercase and uppercase letters
+        public static string ToHexStringLower(byte[] data)
+        {
+            if (data == null)
+                return null;
+            char[] c = new char[data.Length * 2];
+            int b;
+            for (int i = 0; i < data.Length; i++)
+            {
+                b = data[i] >> 4;
+                c[i * 2] = (char)(87 + b + (((b - 10) >> 31) & -39));
+                b = data[i] & 0xF;
+                c[i * 2 + 1] = (char)(87 + b + (((b - 10) >> 31) & -39));
+            }
+            return new string(c);
+        }
+
+        public static byte[] FromHexString(string hexString)
+        {
+            if (hexString == null)
+                return null;
+            if (hexString.Length % 2 != 0)
+                throw new FormatException("The hex string is invalid because it has an odd length");
+            var result = new byte[hexString.Length / 2];
+            for (int i = 0; i < result.Length; i++)
+                result[i] = Convert.ToByte(hexString.Substring(i * 2, 2), 16);
+            return result;
+        }
+
+        public static string ToBase64String(byte[] data)
+        {
+            if (data == null)
+                return null;
+            return Convert.ToBase64String(data);
+        }
+
+        public static byte[] FromBase64String(string s)
+        {
+            if (s == null)
+                return null;
+            return Convert.FromBase64String(s);
+        }
+    }
+}
+#pragma warning restore CS1591 // Fehledes XML-Kommentar für öffentlich sichtbaren Typ oder Element
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519.cs
new file mode 100644
index 000000000..e9d638829
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519.cs
@@ -0,0 +1,150 @@
+using System;
+using Chaos.NaCl.Internal.Ed25519Ref10;
+
+#pragma warning disable CS1591 // Fehledes XML-Kommentar für öffentlich sichtbaren Typ oder Element
+
+namespace Chaos.NaCl
+{
+    public static class Ed25519
+    {
+        public static readonly int PublicKeySizeInBytes = 32;
+        public static readonly int SignatureSizeInBytes = 64;
+        public static readonly int ExpandedPrivateKeySizeInBytes = 32 * 2;
+        public static readonly int PrivateKeySeedSizeInBytes = 32;
+        public static readonly int SharedKeySizeInBytes = 32;
+
+        public static bool Verify(ArraySegment<byte> signature, ArraySegment<byte> message, ArraySegment<byte> publicKey)
+        {
+            if (signature.Count != SignatureSizeInBytes)
+                throw new ArgumentException(string.Format("Signature size must be {0}", SignatureSizeInBytes), "signature.Count");
+            if (publicKey.Count != PublicKeySizeInBytes)
+                throw new ArgumentException(string.Format("Public key size must be {0}", PublicKeySizeInBytes), "publicKey.Count");
+            return Ed25519Operations.crypto_sign_verify(signature.Array, signature.Offset, message.Array, message.Offset, message.Count, publicKey.Array, publicKey.Offset);
+        }
+
+        public static bool Verify(byte[] signature, byte[] message, byte[] publicKey)
+        {
+            if (signature == null)
+                throw new ArgumentNullException("signature");
+            if (message == null)
+                throw new ArgumentNullException("message");
+            if (publicKey == null)
+                throw new ArgumentNullException("publicKey");
+            if (signature.Length != SignatureSizeInBytes)
+                throw new ArgumentException(string.Format("Signature size must be {0}", SignatureSizeInBytes), "signature.Length");
+            if (publicKey.Length != PublicKeySizeInBytes)
+                throw new ArgumentException(string.Format("Public key size must be {0}", PublicKeySizeInBytes), "publicKey.Length");
+            return Ed25519Operations.crypto_sign_verify(signature, 0, message, 0, message.Length, publicKey, 0);
+        }
+
+        public static void Sign(ArraySegment<byte> signature, ArraySegment<byte> message, ArraySegment<byte> expandedPrivateKey)
+        {
+            if (signature.Array == null)
+                throw new ArgumentNullException("signature.Array");
+            if (signature.Count != SignatureSizeInBytes)
+                throw new ArgumentException("signature.Count");
+            if (expandedPrivateKey.Array == null)
+                throw new ArgumentNullException("expandedPrivateKey.Array");
+            if (expandedPrivateKey.Count != ExpandedPrivateKeySizeInBytes)
+                throw new ArgumentException("expandedPrivateKey.Count");
+            if (message.Array == null)
+                throw new ArgumentNullException("message.Array");
+            Ed25519Operations.crypto_sign2(signature.Array, signature.Offset, message.Array, message.Offset, message.Count, expandedPrivateKey.Array, expandedPrivateKey.Offset);
+        }
+
+        public static byte[] Sign(byte[] message, byte[] expandedPrivateKey)
+        {
+            var signature = new byte[SignatureSizeInBytes];
+            Sign(new ArraySegment<byte>(signature), new ArraySegment<byte>(message), new ArraySegment<byte>(expandedPrivateKey));
+            return signature;
+        }
+
+        public static byte[] PublicKeyFromSeed(byte[] privateKeySeed)
+        {
+            byte[] privateKey;
+            byte[] publicKey;
+            KeyPairFromSeed(out publicKey, out privateKey, privateKeySeed);
+            CryptoBytes.Wipe(privateKey);
+            return publicKey;
+        }
+
+        public static byte[] ExpandedPrivateKeyFromSeed(byte[] privateKeySeed)
+        {
+            byte[] privateKey;
+            byte[] publicKey;
+            KeyPairFromSeed(out publicKey, out privateKey, privateKeySeed);
+            CryptoBytes.Wipe(publicKey);
+            return privateKey;
+        }
+
+        public static void KeyPairFromSeed(out byte[] publicKey, out byte[] expandedPrivateKey, byte[] privateKeySeed)
+        {
+            if (privateKeySeed == null)
+                throw new ArgumentNullException("privateKeySeed");
+            if (privateKeySeed.Length != PrivateKeySeedSizeInBytes)
+                throw new ArgumentException("privateKeySeed");
+            var pk = new byte[PublicKeySizeInBytes];
+            var sk = new byte[ExpandedPrivateKeySizeInBytes];
+            Ed25519Operations.crypto_sign_keypair(pk, 0, sk, 0, privateKeySeed, 0);
+            publicKey = pk;
+            expandedPrivateKey = sk;
+        }
+
+        public static void KeyPairFromSeed(ArraySegment<byte> publicKey, ArraySegment<byte> expandedPrivateKey, ArraySegment<byte> privateKeySeed)
+        {
+            if (publicKey.Array == null)
+                throw new ArgumentNullException("publicKey.Array");
+            if (expandedPrivateKey.Array == null)
+                throw new ArgumentNullException("expandedPrivateKey.Array");
+            if (privateKeySeed.Array == null)
+                throw new ArgumentNullException("privateKeySeed.Array");
+            if (publicKey.Count != PublicKeySizeInBytes)
+                throw new ArgumentException("publicKey.Count");
+            if (expandedPrivateKey.Count != ExpandedPrivateKeySizeInBytes)
+                throw new ArgumentException("expandedPrivateKey.Count");
+            if (privateKeySeed.Count != PrivateKeySeedSizeInBytes)
+                throw new ArgumentException("privateKeySeed.Count");
+            Ed25519Operations.crypto_sign_keypair(
+                publicKey.Array, publicKey.Offset,
+                expandedPrivateKey.Array, expandedPrivateKey.Offset,
+                privateKeySeed.Array, privateKeySeed.Offset);
+        }
+
+        [Obsolete("Needs more testing")]
+        public static byte[] KeyExchange(byte[] publicKey, byte[] privateKey)
+        {
+            var sharedKey = new byte[SharedKeySizeInBytes];
+            KeyExchange(new ArraySegment<byte>(sharedKey), new ArraySegment<byte>(publicKey), new ArraySegment<byte>(privateKey));
+            return sharedKey;
+        }
+
+        [Obsolete("Needs more testing")]
+        public static void KeyExchange(ArraySegment<byte> sharedKey, ArraySegment<byte> publicKey, ArraySegment<byte> privateKey)
+        {
+            if (sharedKey.Array == null)
+                throw new ArgumentNullException("sharedKey.Array");
+            if (publicKey.Array == null)
+                throw new ArgumentNullException("publicKey.Array");
+            if (privateKey.Array == null)
+                throw new ArgumentNullException("privateKey");
+            if (sharedKey.Count != 32)
+                throw new ArgumentException("sharedKey.Count != 32");
+            if (publicKey.Count != 32)
+                throw new ArgumentException("publicKey.Count != 32");
+            if (privateKey.Count != 64)
+                throw new ArgumentException("privateKey.Count != 64");
+
+            FieldElement montgomeryX, edwardsY, edwardsZ, sharedMontgomeryX;
+            FieldOperations.fe_frombytes(out edwardsY, publicKey.Array, publicKey.Offset);
+            FieldOperations.fe_1(out edwardsZ);
+            MontgomeryCurve25519.EdwardsToMontgomeryX(out montgomeryX, ref edwardsY, ref edwardsZ);
+            byte[] h = Sha512.Hash(privateKey.Array, privateKey.Offset, 32);//ToDo: Remove alloc
+            ScalarOperations.sc_clamp(h, 0);
+            MontgomeryOperations.scalarmult(out sharedMontgomeryX, h, 0, ref montgomeryX);
+            CryptoBytes.Wipe(h);
+            FieldOperations.fe_tobytes(sharedKey.Array, sharedKey.Offset, ref sharedMontgomeryX);
+            MontgomeryCurve25519.KeyExchangeOutputHashNaCl(sharedKey.Array, sharedKey.Offset);
+        }
+    }
+}
+#pragma warning restore CS1591 // Fehledes XML-Kommentar für öffentlich sichtbaren Typ oder Element
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/FieldElement.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/FieldElement.cs
new file mode 100644
index 000000000..5a5c785b9
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/FieldElement.cs
@@ -0,0 +1,36 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+    internal struct FieldElement
+    {
+        internal int x0;
+        internal int x1;
+        internal int x2;
+        internal int x3;
+        internal int x4;
+        internal int x5;
+        internal int x6;
+        internal int x7;
+        internal int x8;
+        internal int x9;
+
+        //public static readonly FieldElement Zero = new FieldElement();
+        //public static readonly FieldElement One = new FieldElement() { x0 = 1 };
+
+        internal FieldElement(params int[] elements)
+        {
+            InternalAssert.Assert(elements.Length == 10, "elements.Length != 10");
+            x0 = elements[0];
+            x1 = elements[1];
+            x2 = elements[2];
+            x3 = elements[3];
+            x4 = elements[4];
+            x5 = elements[5];
+            x6 = elements[6];
+            x7 = elements[7];
+            x8 = elements[8];
+            x9 = elements[9];
+        }
+    }
+}
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/GroupElement.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/GroupElement.cs
new file mode 100644
index 000000000..abeaca869
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/GroupElement.cs
@@ -0,0 +1,63 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+	/*
+	ge means group element.
+
+	Here the group is the set of pairs (x,y) of field elements (see fe.h)
+	satisfying -x^2 + y^2 = 1 + d x^2y^2
+	where d = -121665/121666.
+
+	Representations:
+	  ge_p2 (projective): (X:Y:Z) satisfying x=X/Z, y=Y/Z
+	  ge_p3 (extended): (X:Y:Z:T) satisfying x=X/Z, y=Y/Z, XY=ZT
+	  ge_p1p1 (completed): ((X:Z),(Y:T)) satisfying x=X/Z, y=Y/T
+	  ge_precomp (Duif): (y+x,y-x,2dxy)
+	*/
+
+	internal struct GroupElementP2
+	{
+		public FieldElement X;
+		public FieldElement Y;
+		public FieldElement Z;
+	} ;
+
+	internal struct GroupElementP3
+	{
+		public FieldElement X;
+		public FieldElement Y;
+		public FieldElement Z;
+		public FieldElement T;
+	} ;
+
+	internal struct GroupElementP1P1
+	{
+		public FieldElement X;
+		public FieldElement Y;
+		public FieldElement Z;
+		public FieldElement T;
+	} ;
+
+	internal struct GroupElementPreComp
+	{
+		public FieldElement yplusx;
+		public FieldElement yminusx;
+		public FieldElement xy2d;
+
+		public GroupElementPreComp(FieldElement yplusx, FieldElement yminusx, FieldElement xy2d)
+		{
+			this.yplusx = yplusx;
+			this.yminusx = yminusx;
+			this.xy2d = xy2d;
+		}
+	} ;
+
+	internal struct GroupElementCached
+	{
+		public FieldElement YplusX;
+		public FieldElement YminusX;
+		public FieldElement Z;
+		public FieldElement T2d;
+	} ;
+}
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/base.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/base.cs
new file mode 100644
index 000000000..5627e9c77
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/base.cs
@@ -0,0 +1,1357 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+    internal static partial class LookupTables
+    {
+        /* base[i][j] = (j+1)*256^i*B */
+        //32*8
+        internal static GroupElementPreComp[][] Base = new GroupElementPreComp[][]
+        {
+            new[]{
+                new GroupElementPreComp(
+                    new FieldElement( 25967493,-14356035,29566456,3660896,-12694345,4014787,27544626,-11754271,-6079156,2047605 ),
+                    new FieldElement( -12545711,934262,-2722910,3049990,-727428,9406986,12720692,5043384,19500929,-15469378 ),
+                    new FieldElement( -8738181,4489570,9688441,-14785194,10184609,-12363380,29287919,11864899,-24514362,-4438546 )
+                ),
+                new GroupElementPreComp(
+                    new FieldElement( -12815894,-12976347,-21581243,11784320,-25355658,-2750717,-11717903,-3814571,-358445,-10211303 ),
+                    new FieldElement( -21703237,6903825,27185491,6451973,-29577724,-9554005,-15616551,11189268,-26829678,-5319081 ),
+                    new FieldElement( 26966642,11152617,32442495,15396054,14353839,-12752335,-3128826,-9541118,-15472047,-4166697 )
+                ),
+                new GroupElementPreComp(
+                    new FieldElement( 15636291,-9688557,24204773,-7912398,616977,-16685262,27787600,-14772189,28944400,-1550024 ),
+                    new FieldElement( 16568933,4717097,-11556148,-1102322,15682896,-11807043,16354577,-11775962,7689662,11199574 ),
+                    new FieldElement( 30464156,-5976125,-11779434,-15670865,23220365,15915852,7512774,10017326,-17749093,-9920357 )
+                ),
+                new GroupElementPreComp(
+                    new FieldElement( -17036878,13921892,10945806,-6033431,27105052,-16084379,-28926210,15006023,3284568,-6276540 ),
+                    new FieldElement( 23599295,-8306047,-11193664,-7687416,13236774,10506355,7464579,9656445,13059162,10374397 ),
+                    new FieldElement( 7798556,16710257,3033922,2874086,28997861,2835604,32406664,-3839045,-641708,-101325 )
+                ),
+                new GroupElementPreComp(
+                    new FieldElement( 10861363,11473154,27284546,1981175,-30064349,12577861,32867885,14515107,-15438304,10819380 ),
+                    new FieldElement( 4708026,6336745,20377586,9066809,-11272109,6594696,-25653668,12483688,-12668491,5581306 ),
+                    new FieldElement( 19563160,16186464,-29386857,4097519,10237984,-4348115,28542350,13850243,-23678021,-15815942 )
+                ),
+                new GroupElementPreComp(
+                    new FieldElement( -15371964,-12862754,32573250,4720197,-26436522,5875511,-19188627,-15224819,-9818940,-12085777 ),
+                    new FieldElement( -8549212,109983,15149363,2178705,22900618,4543417,3044240,-15689887,1762328,14866737 ),
+                    new FieldElement( -18199695,-15951423,-10473290,1707278,-17185920,3916101,-28236412,3959421,27914454,4383652 )
+                ),
+                new GroupElementPreComp(
+                    new FieldElement( 5153746,9909285,1723747,-2777874,30523605,5516873,19480852,5230134,-23952439,-15175766 ),
+                    new FieldElement( -30269007,-3463509,7665486,10083793,28475525,1649722,20654025,16520125,30598449,7715701 ),
+                    new FieldElement( 28881845,14381568,9657904,3680757,-20181635,7843316,-31400660,1370708,29794553,-1409300 )
+                ),
+                new GroupElementPreComp(
+                    new FieldElement( 14499471,-2729599,-33191113,-4254652,28494862,14271267,30290735,10876454,-33154098,2381726 ),
+                    new FieldElement( -7195431,-2655363,-14730155,462251,-27724326,3941372,-6236617,3696005,-32300832,15351955 ),
+                    new FieldElement( 27431194,8222322,16448760,-3907995,-18707002,11938355,-32961401,-2970515,29551813,10109425 )
+                ),
+            },
+            new[]{
+                new GroupElementPreComp(
+                    new FieldElement( -13657040,-13155431,-31283750,11777098,21447386,6519384,-2378284,-1627556,10092783,-4764171 ),
+                    new FieldElement( 27939166,14210322,4677035,16277044,-22964462,-12398139,-32508754,12005538,-17810127,12803510 ),
+                    new FieldElement( 17228999,-15661624,-1233527,300140,-1224870,-11714777,30364213,-9038194,18016357,4397660 )
+                ),
+                new GroupElementPreComp(
+                    new FieldElement( -10958843,-7690207,4776341,-14954238,27850028,-15602212,-26619106,14544525,-17477504,982639 ),
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+                    new FieldElement( -25493081,-6962928,32500200,-9419051,-23038724,-2302222,14898637,3848455,20969334,-5157516 ),
+                    new FieldElement( -20384450,-14347713,-18336405,13884722,-33039454,2842114,-21610826,-3649888,11177095,14989547 ),
+                    new FieldElement( -24496721,-11716016,16959896,2278463,12066309,10137771,13515641,2581286,-28487508,9930240 )
+                ),
+                new GroupElementPreComp(
+                    new FieldElement( -17751622,-2097826,16544300,-13009300,-15914807,-14949081,18345767,-13403753,16291481,-5314038 ),
+                    new FieldElement( -33229194,2553288,32678213,9875984,8534129,6889387,-9676774,6957617,4368891,9788741 ),
+                    new FieldElement( 16660756,7281060,-10830758,12911820,20108584,-8101676,-21722536,-8613148,16250552,-11111103 )
+                ),
+                new GroupElementPreComp(
+                    new FieldElement( -19765507,2390526,-16551031,14161980,1905286,6414907,4689584,10604807,-30190403,4782747 ),
+                    new FieldElement( -1354539,14736941,-7367442,-13292886,7710542,-14155590,-9981571,4383045,22546403,437323 ),
+                    new FieldElement( 31665577,-12180464,-16186830,1491339,-18368625,3294682,27343084,2786261,-30633590,-14097016 )
+                ),
+                new GroupElementPreComp(
+                    new FieldElement( -14467279,-683715,-33374107,7448552,19294360,14334329,-19690631,2355319,-19284671,-6114373 ),
+                    new FieldElement( 15121312,-15796162,6377020,-6031361,-10798111,-12957845,18952177,15496498,-29380133,11754228 ),
+                    new FieldElement( -2637277,-13483075,8488727,-14303896,12728761,-1622493,7141596,11724556,22761615,-10134141 )
+                ),
+                new GroupElementPreComp(
+                    new FieldElement( 16918416,11729663,-18083579,3022987,-31015732,-13339659,-28741185,-12227393,32851222,11717399 ),
+                    new FieldElement( 11166634,7338049,-6722523,4531520,-29468672,-7302055,31474879,3483633,-1193175,-4030831 ),
+                    new FieldElement( -185635,9921305,31456609,-13536438,-12013818,13348923,33142652,6546660,-19985279,-3948376 )
+                ),
+                new GroupElementPreComp(
+                    new FieldElement( -32460596,11266712,-11197107,-7899103,31703694,3855903,-8537131,-12833048,-30772034,-15486313 ),
+                    new FieldElement( -18006477,12709068,3991746,-6479188,-21491523,-10550425,-31135347,-16049879,10928917,3011958 ),
+                    new FieldElement( -6957757,-15594337,31696059,334240,29576716,14796075,-30831056,-12805180,18008031,10258577 )
+                ),
+                new GroupElementPreComp(
+                    new FieldElement( -22448644,15655569,7018479,-4410003,-30314266,-1201591,-1853465,1367120,25127874,6671743 ),
+                    new FieldElement( 29701166,-14373934,-10878120,9279288,-17568,13127210,21382910,11042292,25838796,4642684 ),
+                    new FieldElement( -20430234,14955537,-24126347,8124619,-5369288,-5990470,30468147,-13900640,18423289,4177476 )
+                )
+            }
+        };
+    }
+}
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/base2.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/base2.cs
new file mode 100644
index 000000000..03676e5cf
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/base2.cs
@@ -0,0 +1,50 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+    internal static partial class LookupTables
+    {
+        internal static readonly GroupElementPreComp[] Base2 = new GroupElementPreComp[]{
+            new GroupElementPreComp(
+              new FieldElement( 25967493,-14356035,29566456,3660896,-12694345,4014787,27544626,-11754271,-6079156,2047605 ),
+            new FieldElement( -12545711,934262,-2722910,3049990,-727428,9406986,12720692,5043384,19500929,-15469378 ),
+            new FieldElement( -8738181,4489570,9688441,-14785194,10184609,-12363380,29287919,11864899,-24514362,-4438546 )
+             ),
+            new GroupElementPreComp(
+            new FieldElement( 15636291,-9688557,24204773,-7912398,616977,-16685262,27787600,-14772189,28944400,-1550024 ),
+            new FieldElement( 16568933,4717097,-11556148,-1102322,15682896,-11807043,16354577,-11775962,7689662,11199574 ),
+            new FieldElement( 30464156,-5976125,-11779434,-15670865,23220365,15915852,7512774,10017326,-17749093,-9920357 )
+             ),
+            new GroupElementPreComp(
+            new FieldElement( 10861363,11473154,27284546,1981175,-30064349,12577861,32867885,14515107,-15438304,10819380 ),
+            new FieldElement( 4708026,6336745,20377586,9066809,-11272109,6594696,-25653668,12483688,-12668491,5581306 ),
+            new FieldElement( 19563160,16186464,-29386857,4097519,10237984,-4348115,28542350,13850243,-23678021,-15815942 )
+             ),
+            new GroupElementPreComp(
+            new FieldElement( 5153746,9909285,1723747,-2777874,30523605,5516873,19480852,5230134,-23952439,-15175766 ),
+            new FieldElement( -30269007,-3463509,7665486,10083793,28475525,1649722,20654025,16520125,30598449,7715701 ),
+            new FieldElement( 28881845,14381568,9657904,3680757,-20181635,7843316,-31400660,1370708,29794553,-1409300 )
+             ),
+            new GroupElementPreComp(
+            new FieldElement( -22518993,-6692182,14201702,-8745502,-23510406,8844726,18474211,-1361450,-13062696,13821877 ),
+            new FieldElement( -6455177,-7839871,3374702,-4740862,-27098617,-10571707,31655028,-7212327,18853322,-14220951 ),
+            new FieldElement( 4566830,-12963868,-28974889,-12240689,-7602672,-2830569,-8514358,-10431137,2207753,-3209784 )
+             ),
+            new GroupElementPreComp(
+            new FieldElement( -25154831,-4185821,29681144,7868801,-6854661,-9423865,-12437364,-663000,-31111463,-16132436 ),
+            new FieldElement( 25576264,-2703214,7349804,-11814844,16472782,9300885,3844789,15725684,171356,6466918 ),
+            new FieldElement( 23103977,13316479,9739013,-16149481,817875,-15038942,8965339,-14088058,-30714912,16193877 )
+             ),
+            new GroupElementPreComp(
+            new FieldElement( -33521811,3180713,-2394130,14003687,-16903474,-16270840,17238398,4729455,-18074513,9256800 ),
+            new FieldElement( -25182317,-4174131,32336398,5036987,-21236817,11360617,22616405,9761698,-19827198,630305 ),
+            new FieldElement( -13720693,2639453,-24237460,-7406481,9494427,-5774029,-6554551,-15960994,-2449256,-14291300 )
+             ),
+            new GroupElementPreComp(
+            new FieldElement( -3151181,-5046075,9282714,6866145,-31907062,-863023,-18940575,15033784,25105118,-7894876 ),
+            new FieldElement( -24326370,15950226,-31801215,-14592823,-11662737,-5090925,1573892,-2625887,2198790,-15804619 ),
+            new FieldElement( -3099351,10324967,-2241613,7453183,-5446979,-2735503,-13812022,-16236442,-32461234,-12290683 )
+             )
+		};
+    }
+}
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/d.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/d.cs
new file mode 100644
index 000000000..9a9343ab6
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/d.cs
@@ -0,0 +1,9 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+	internal static partial class LookupTables
+	{
+		internal static FieldElement d = new FieldElement(-10913610, 13857413, -15372611, 6949391, 114729, -8787816, -6275908, -3247719, -18696448, -12055116);
+	}
+}
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/d2.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/d2.cs
new file mode 100644
index 000000000..74793114b
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/d2.cs
@@ -0,0 +1,9 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+	internal static partial class LookupTables
+	{
+		internal static FieldElement d2 = new FieldElement(-21827239, -5839606, -30745221, 13898782, 229458, 15978800, -12551817, -6495438, 29715968, 9444199);
+	}
+}
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_0.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_0.cs
new file mode 100644
index 000000000..f20753261
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_0.cs
@@ -0,0 +1,12 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+	internal static partial class FieldOperations
+	{
+		public static void fe_0(out FieldElement h)
+		{
+			h = default(FieldElement);
+		}
+	}
+}
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_1.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_1.cs
new file mode 100644
index 000000000..822ea59a3
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_1.cs
@@ -0,0 +1,13 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+	internal static partial class FieldOperations
+	{
+		public static void fe_1(out FieldElement h)
+		{
+			h = default(FieldElement);
+			h.x0 = 1;
+		}
+	}
+}
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_add.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_add.cs
new file mode 100644
index 000000000..a5c2fb71d
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_add.cs
@@ -0,0 +1,63 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+	internal static partial class FieldOperations
+	{
+		/*
+		h = f + g
+		Can overlap h with f or g.
+
+		Preconditions:
+		   |f| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
+		   |g| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
+
+		Postconditions:
+		   |h| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc.
+		*/
+		//void fe_add(fe h,const fe f,const fe g)
+		internal static void fe_add(out FieldElement h, ref FieldElement f, ref FieldElement g)
+		{
+			Int32 f0 = f.x0;
+			Int32 f1 = f.x1;
+			Int32 f2 = f.x2;
+			Int32 f3 = f.x3;
+			Int32 f4 = f.x4;
+			Int32 f5 = f.x5;
+			Int32 f6 = f.x6;
+			Int32 f7 = f.x7;
+			Int32 f8 = f.x8;
+			Int32 f9 = f.x9;
+			Int32 g0 = g.x0;
+			Int32 g1 = g.x1;
+			Int32 g2 = g.x2;
+			Int32 g3 = g.x3;
+			Int32 g4 = g.x4;
+			Int32 g5 = g.x5;
+			Int32 g6 = g.x6;
+			Int32 g7 = g.x7;
+			Int32 g8 = g.x8;
+			Int32 g9 = g.x9;
+			Int32 h0 = f0 + g0;
+			Int32 h1 = f1 + g1;
+			Int32 h2 = f2 + g2;
+			Int32 h3 = f3 + g3;
+			Int32 h4 = f4 + g4;
+			Int32 h5 = f5 + g5;
+			Int32 h6 = f6 + g6;
+			Int32 h7 = f7 + g7;
+			Int32 h8 = f8 + g8;
+			Int32 h9 = f9 + g9;
+			h.x0 = h0;
+			h.x1 = h1;
+			h.x2 = h2;
+			h.x3 = h3;
+			h.x4 = h4;
+			h.x5 = h5;
+			h.x6 = h6;
+			h.x7 = h7;
+			h.x8 = h8;
+			h.x9 = h9;
+		}
+	}
+}
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_cmov.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_cmov.cs
new file mode 100644
index 000000000..039905b07
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_cmov.cs
@@ -0,0 +1,70 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+	internal static partial class FieldOperations
+	{
+		/*
+		Replace (f,g) with (g,g) if b == 1;
+		replace (f,g) with (f,g) if b == 0.
+
+		Preconditions: b in {0,1}.
+		*/
+
+		//void fe_cmov(fe f,const fe g,unsigned int b)
+		internal static void fe_cmov(ref FieldElement f, ref FieldElement g, int b)
+		{
+			Int32 f0 = f.x0;
+			Int32 f1 = f.x1;
+			Int32 f2 = f.x2;
+			Int32 f3 = f.x3;
+			Int32 f4 = f.x4;
+			Int32 f5 = f.x5;
+			Int32 f6 = f.x6;
+			Int32 f7 = f.x7;
+			Int32 f8 = f.x8;
+			Int32 f9 = f.x9;
+			Int32 g0 = g.x0;
+			Int32 g1 = g.x1;
+			Int32 g2 = g.x2;
+			Int32 g3 = g.x3;
+			Int32 g4 = g.x4;
+			Int32 g5 = g.x5;
+			Int32 g6 = g.x6;
+			Int32 g7 = g.x7;
+			Int32 g8 = g.x8;
+			Int32 g9 = g.x9;
+			Int32 x0 = f0 ^ g0;
+			Int32 x1 = f1 ^ g1;
+			Int32 x2 = f2 ^ g2;
+			Int32 x3 = f3 ^ g3;
+			Int32 x4 = f4 ^ g4;
+			Int32 x5 = f5 ^ g5;
+			Int32 x6 = f6 ^ g6;
+			Int32 x7 = f7 ^ g7;
+			Int32 x8 = f8 ^ g8;
+			Int32 x9 = f9 ^ g9;
+			b = -b;
+			x0 &= b;
+			x1 &= b;
+			x2 &= b;
+			x3 &= b;
+			x4 &= b;
+			x5 &= b;
+			x6 &= b;
+			x7 &= b;
+			x8 &= b;
+			x9 &= b;
+			f.x0 = f0 ^ x0;
+			f.x1 = f1 ^ x1;
+			f.x2 = f2 ^ x2;
+			f.x3 = f3 ^ x3;
+			f.x4 = f4 ^ x4;
+			f.x5 = f5 ^ x5;
+			f.x6 = f6 ^ x6;
+			f.x7 = f7 ^ x7;
+			f.x8 = f8 ^ x8;
+			f.x9 = f9 ^ x9;
+		}
+	}
+}
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_cswap.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_cswap.cs
new file mode 100644
index 000000000..b28bf20d5
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_cswap.cs
@@ -0,0 +1,78 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+    internal static partial class FieldOperations
+    {
+        /*
+        Replace (f,g) with (g,f) if b == 1;
+        replace (f,g) with (f,g) if b == 0.
+
+        Preconditions: b in {0,1}.
+        */
+        public static void fe_cswap(ref FieldElement f, ref FieldElement g, uint b)
+        {
+            Int32 f0 = f.x0;
+            Int32 f1 = f.x1;
+            Int32 f2 = f.x2;
+            Int32 f3 = f.x3;
+            Int32 f4 = f.x4;
+            Int32 f5 = f.x5;
+            Int32 f6 = f.x6;
+            Int32 f7 = f.x7;
+            Int32 f8 = f.x8;
+            Int32 f9 = f.x9;
+            Int32 g0 = g.x0;
+            Int32 g1 = g.x1;
+            Int32 g2 = g.x2;
+            Int32 g3 = g.x3;
+            Int32 g4 = g.x4;
+            Int32 g5 = g.x5;
+            Int32 g6 = g.x6;
+            Int32 g7 = g.x7;
+            Int32 g8 = g.x8;
+            Int32 g9 = g.x9;
+            Int32 x0 = f0 ^ g0;
+            Int32 x1 = f1 ^ g1;
+            Int32 x2 = f2 ^ g2;
+            Int32 x3 = f3 ^ g3;
+            Int32 x4 = f4 ^ g4;
+            Int32 x5 = f5 ^ g5;
+            Int32 x6 = f6 ^ g6;
+            Int32 x7 = f7 ^ g7;
+            Int32 x8 = f8 ^ g8;
+            Int32 x9 = f9 ^ g9;
+            int negb = unchecked((int)-b);
+            x0 &= negb;
+            x1 &= negb;
+            x2 &= negb;
+            x3 &= negb;
+            x4 &= negb;
+            x5 &= negb;
+            x6 &= negb;
+            x7 &= negb;
+            x8 &= negb;
+            x9 &= negb;
+            f.x0 = f0 ^ x0;
+            f.x1 = f1 ^ x1;
+            f.x2 = f2 ^ x2;
+            f.x3 = f3 ^ x3;
+            f.x4 = f4 ^ x4;
+            f.x5 = f5 ^ x5;
+            f.x6 = f6 ^ x6;
+            f.x7 = f7 ^ x7;
+            f.x8 = f8 ^ x8;
+            f.x9 = f9 ^ x9;
+            g.x0 = g0 ^ x0;
+            g.x1 = g1 ^ x1;
+            g.x2 = g2 ^ x2;
+            g.x3 = g3 ^ x3;
+            g.x4 = g4 ^ x4;
+            g.x5 = g5 ^ x5;
+            g.x6 = g6 ^ x6;
+            g.x7 = g7 ^ x7;
+            g.x8 = g8 ^ x8;
+            g.x9 = g9 ^ x9;
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_frombytes.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_frombytes.cs
new file mode 100644
index 000000000..49afb1833
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_frombytes.cs
@@ -0,0 +1,122 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+	internal static partial class FieldOperations
+	{
+		private static Int64 load_3(byte[] data, int offset)
+		{
+			uint result;
+			result = (uint)data[offset + 0];
+			result |= (uint)data[offset + 1] << 8;
+			result |= (uint)data[offset + 2] << 16;
+			return (Int64)(UInt64)result;
+		}
+
+		private static Int64 load_4(byte[] data, int offset)
+		{
+			uint result;
+			result = (uint)data[offset + 0];
+			result |= (uint)data[offset + 1] << 8;
+			result |= (uint)data[offset + 2] << 16;
+			result |= (uint)data[offset + 3] << 24;
+			return (Int64)(UInt64)result;
+		}
+
+		//	Ignores top bit of h.
+		internal static void fe_frombytes(out FieldElement h, byte[] data, int offset)
+		{
+			Int64 h0 = load_4(data, offset);
+			Int64 h1 = load_3(data, offset + 4) << 6;
+			Int64 h2 = load_3(data, offset + 7) << 5;
+			Int64 h3 = load_3(data, offset + 10) << 3;
+			Int64 h4 = load_3(data, offset + 13) << 2;
+			Int64 h5 = load_4(data, offset + 16);
+			Int64 h6 = load_3(data, offset + 20) << 7;
+			Int64 h7 = load_3(data, offset + 23) << 5;
+			Int64 h8 = load_3(data, offset + 26) << 4;
+			Int64 h9 = (load_3(data, offset + 29) & 8388607) << 2;
+			Int64 carry0;
+			Int64 carry1;
+			Int64 carry2;
+			Int64 carry3;
+			Int64 carry4;
+			Int64 carry5;
+			Int64 carry6;
+			Int64 carry7;
+			Int64 carry8;
+			Int64 carry9;
+
+			carry9 = (h9 + (Int64)(1 << 24)) >> 25; h0 += carry9 * 19; h9 -= carry9 << 25;
+			carry1 = (h1 + (Int64)(1 << 24)) >> 25; h2 += carry1; h1 -= carry1 << 25;
+			carry3 = (h3 + (Int64)(1 << 24)) >> 25; h4 += carry3; h3 -= carry3 << 25;
+			carry5 = (h5 + (Int64)(1 << 24)) >> 25; h6 += carry5; h5 -= carry5 << 25;
+			carry7 = (h7 + (Int64)(1 << 24)) >> 25; h8 += carry7; h7 -= carry7 << 25;
+
+			carry0 = (h0 + (Int64)(1 << 25)) >> 26; h1 += carry0; h0 -= carry0 << 26;
+			carry2 = (h2 + (Int64)(1 << 25)) >> 26; h3 += carry2; h2 -= carry2 << 26;
+			carry4 = (h4 + (Int64)(1 << 25)) >> 26; h5 += carry4; h4 -= carry4 << 26;
+			carry6 = (h6 + (Int64)(1 << 25)) >> 26; h7 += carry6; h6 -= carry6 << 26;
+			carry8 = (h8 + (Int64)(1 << 25)) >> 26; h9 += carry8; h8 -= carry8 << 26;
+
+			h.x0 = (int)h0;
+			h.x1 = (int)h1;
+			h.x2 = (int)h2;
+			h.x3 = (int)h3;
+			h.x4 = (int)h4;
+			h.x5 = (int)h5;
+			h.x6 = (int)h6;
+			h.x7 = (int)h7;
+			h.x8 = (int)h8;
+			h.x9 = (int)h9;
+		}
+
+		// does NOT ignore top bit
+		internal static void fe_frombytes2(out FieldElement h, byte[] data, int offset)
+		{
+			Int64 h0 = load_4(data, offset);
+			Int64 h1 = load_3(data, offset + 4) << 6;
+			Int64 h2 = load_3(data, offset + 7) << 5;
+			Int64 h3 = load_3(data, offset + 10) << 3;
+			Int64 h4 = load_3(data, offset + 13) << 2;
+			Int64 h5 = load_4(data, offset + 16);
+			Int64 h6 = load_3(data, offset + 20) << 7;
+			Int64 h7 = load_3(data, offset + 23) << 5;
+			Int64 h8 = load_3(data, offset + 26) << 4;
+			Int64 h9 = load_3(data, offset + 29) << 2;
+			Int64 carry0;
+			Int64 carry1;
+			Int64 carry2;
+			Int64 carry3;
+			Int64 carry4;
+			Int64 carry5;
+			Int64 carry6;
+			Int64 carry7;
+			Int64 carry8;
+			Int64 carry9;
+
+			carry9 = (h9 + (Int64)(1 << 24)) >> 25; h0 += carry9 * 19; h9 -= carry9 << 25;
+			carry1 = (h1 + (Int64)(1 << 24)) >> 25; h2 += carry1; h1 -= carry1 << 25;
+			carry3 = (h3 + (Int64)(1 << 24)) >> 25; h4 += carry3; h3 -= carry3 << 25;
+			carry5 = (h5 + (Int64)(1 << 24)) >> 25; h6 += carry5; h5 -= carry5 << 25;
+			carry7 = (h7 + (Int64)(1 << 24)) >> 25; h8 += carry7; h7 -= carry7 << 25;
+
+			carry0 = (h0 + (Int64)(1 << 25)) >> 26; h1 += carry0; h0 -= carry0 << 26;
+			carry2 = (h2 + (Int64)(1 << 25)) >> 26; h3 += carry2; h2 -= carry2 << 26;
+			carry4 = (h4 + (Int64)(1 << 25)) >> 26; h5 += carry4; h4 -= carry4 << 26;
+			carry6 = (h6 + (Int64)(1 << 25)) >> 26; h7 += carry6; h6 -= carry6 << 26;
+			carry8 = (h8 + (Int64)(1 << 25)) >> 26; h9 += carry8; h8 -= carry8 << 26;
+
+			h.x0 = (int)h0;
+			h.x1 = (int)h1;
+			h.x2 = (int)h2;
+			h.x3 = (int)h3;
+			h.x4 = (int)h4;
+			h.x5 = (int)h5;
+			h.x6 = (int)h6;
+			h.x7 = (int)h7;
+			h.x8 = (int)h8;
+			h.x9 = (int)h9;
+		}
+	}
+}
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_invert.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_invert.cs
new file mode 100644
index 000000000..697fcc4bd
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_invert.cs
@@ -0,0 +1,179 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+	internal static partial class FieldOperations
+	{
+		internal static void fe_invert(out FieldElement result, ref FieldElement z)
+		{
+			FieldElement t0;
+			FieldElement t1;
+			FieldElement t2;
+			FieldElement t3;
+			int i;
+
+			/* qhasm: fe z1 */
+
+			/* qhasm: fe z2 */
+
+			/* qhasm: fe z8 */
+
+			/* qhasm: fe z9 */
+
+			/* qhasm: fe z11 */
+
+			/* qhasm: fe z22 */
+
+			/* qhasm: fe z_5_0 */
+
+			/* qhasm: fe z_10_5 */
+
+			/* qhasm: fe z_10_0 */
+
+			/* qhasm: fe z_20_10 */
+
+			/* qhasm: fe z_20_0 */
+
+			/* qhasm: fe z_40_20 */
+
+			/* qhasm: fe z_40_0 */
+
+			/* qhasm: fe z_50_10 */
+
+			/* qhasm: fe z_50_0 */
+
+			/* qhasm: fe z_100_50 */
+
+			/* qhasm: fe z_100_0 */
+
+			/* qhasm: fe z_200_100 */
+
+			/* qhasm: fe z_200_0 */
+
+			/* qhasm: fe z_250_50 */
+
+			/* qhasm: fe z_250_0 */
+
+			/* qhasm: fe z_255_5 */
+
+			/* qhasm: fe z_255_21 */
+
+			/* qhasm: enter pow225521 */
+
+			/* qhasm: z2 = z1^2^1 */
+			/* asm 1: fe_sq(>z2=fe#1,<z1=fe#11); for (i = 1;i < 1;++i) fe_sq(>z2=fe#1,>z2=fe#1); */
+			/* asm 2: fe_sq(>z2=t0,<z1=z); for (i = 1;i < 1;++i) fe_sq(>z2=t0,>z2=t0); */
+			fe_sq(out t0, ref z); //for (i = 1; i < 1; ++i) fe_sq(out t0, ref t0);
+
+			/* qhasm: z8 = z2^2^2 */
+			/* asm 1: fe_sq(>z8=fe#2,<z2=fe#1); for (i = 1;i < 2;++i) fe_sq(>z8=fe#2,>z8=fe#2); */
+			/* asm 2: fe_sq(>z8=t1,<z2=t0); for (i = 1;i < 2;++i) fe_sq(>z8=t1,>z8=t1); */
+			fe_sq(out t1, ref t0); for (i = 1; i < 2; ++i) fe_sq(out t1, ref t1);
+
+			/* qhasm: z9 = z1*z8 */
+			/* asm 1: fe_mul(>z9=fe#2,<z1=fe#11,<z8=fe#2); */
+			/* asm 2: fe_mul(>z9=t1,<z1=z,<z8=t1); */
+			fe_mul(out t1, ref z, ref t1);
+
+			/* qhasm: z11 = z2*z9 */
+			/* asm 1: fe_mul(>z11=fe#1,<z2=fe#1,<z9=fe#2); */
+			/* asm 2: fe_mul(>z11=t0,<z2=t0,<z9=t1); */
+			fe_mul(out t0, ref t0, ref t1);
+
+			/* qhasm: z22 = z11^2^1 */
+			/* asm 1: fe_sq(>z22=fe#3,<z11=fe#1); for (i = 1;i < 1;++i) fe_sq(>z22=fe#3,>z22=fe#3); */
+			/* asm 2: fe_sq(>z22=t2,<z11=t0); for (i = 1;i < 1;++i) fe_sq(>z22=t2,>z22=t2); */
+			fe_sq(out t2, ref t0); //for (i = 1; i < 1; ++i) fe_sq(out t2, ref t2);
+
+			/* qhasm: z_5_0 = z9*z22 */
+			/* asm 1: fe_mul(>z_5_0=fe#2,<z9=fe#2,<z22=fe#3); */
+			/* asm 2: fe_mul(>z_5_0=t1,<z9=t1,<z22=t2); */
+			fe_mul(out t1, ref t1, ref t2);
+
+			/* qhasm: z_10_5 = z_5_0^2^5 */
+			/* asm 1: fe_sq(>z_10_5=fe#3,<z_5_0=fe#2); for (i = 1;i < 5;++i) fe_sq(>z_10_5=fe#3,>z_10_5=fe#3); */
+			/* asm 2: fe_sq(>z_10_5=t2,<z_5_0=t1); for (i = 1;i < 5;++i) fe_sq(>z_10_5=t2,>z_10_5=t2); */
+			fe_sq(out t2, ref t1); for (i = 1; i < 5; ++i) fe_sq(out t2, ref t2);
+
+			/* qhasm: z_10_0 = z_10_5*z_5_0 */
+			/* asm 1: fe_mul(>z_10_0=fe#2,<z_10_5=fe#3,<z_5_0=fe#2); */
+			/* asm 2: fe_mul(>z_10_0=t1,<z_10_5=t2,<z_5_0=t1); */
+			fe_mul(out t1, ref t2, ref t1);
+
+			/* qhasm: z_20_10 = z_10_0^2^10 */
+			/* asm 1: fe_sq(>z_20_10=fe#3,<z_10_0=fe#2); for (i = 1;i < 10;++i) fe_sq(>z_20_10=fe#3,>z_20_10=fe#3); */
+			/* asm 2: fe_sq(>z_20_10=t2,<z_10_0=t1); for (i = 1;i < 10;++i) fe_sq(>z_20_10=t2,>z_20_10=t2); */
+			fe_sq(out t2, ref t1); for (i = 1; i < 10; ++i) fe_sq(out t2, ref t2);
+
+			/* qhasm: z_20_0 = z_20_10*z_10_0 */
+			/* asm 1: fe_mul(>z_20_0=fe#3,<z_20_10=fe#3,<z_10_0=fe#2); */
+			/* asm 2: fe_mul(>z_20_0=t2,<z_20_10=t2,<z_10_0=t1); */
+			fe_mul(out t2, ref t2, ref t1);
+
+			/* qhasm: z_40_20 = z_20_0^2^20 */
+			/* asm 1: fe_sq(>z_40_20=fe#4,<z_20_0=fe#3); for (i = 1;i < 20;++i) fe_sq(>z_40_20=fe#4,>z_40_20=fe#4); */
+			/* asm 2: fe_sq(>z_40_20=t3,<z_20_0=t2); for (i = 1;i < 20;++i) fe_sq(>z_40_20=t3,>z_40_20=t3); */
+			fe_sq(out t3, ref t2); for (i = 1; i < 20; ++i) fe_sq(out t3, ref t3);
+
+			/* qhasm: z_40_0 = z_40_20*z_20_0 */
+			/* asm 1: fe_mul(>z_40_0=fe#3,<z_40_20=fe#4,<z_20_0=fe#3); */
+			/* asm 2: fe_mul(>z_40_0=t2,<z_40_20=t3,<z_20_0=t2); */
+			fe_mul(out t2, ref t3, ref t2);
+
+			/* qhasm: z_50_10 = z_40_0^2^10 */
+			/* asm 1: fe_sq(>z_50_10=fe#3,<z_40_0=fe#3); for (i = 1;i < 10;++i) fe_sq(>z_50_10=fe#3,>z_50_10=fe#3); */
+			/* asm 2: fe_sq(>z_50_10=t2,<z_40_0=t2); for (i = 1;i < 10;++i) fe_sq(>z_50_10=t2,>z_50_10=t2); */
+			fe_sq(out t2, ref t2); for (i = 1; i < 10; ++i) fe_sq(out t2, ref t2);
+
+			/* qhasm: z_50_0 = z_50_10*z_10_0 */
+			/* asm 1: fe_mul(>z_50_0=fe#2,<z_50_10=fe#3,<z_10_0=fe#2); */
+			/* asm 2: fe_mul(>z_50_0=t1,<z_50_10=t2,<z_10_0=t1); */
+			fe_mul(out t1, ref t2, ref t1);
+
+			/* qhasm: z_100_50 = z_50_0^2^50 */
+			/* asm 1: fe_sq(>z_100_50=fe#3,<z_50_0=fe#2); for (i = 1;i < 50;++i) fe_sq(>z_100_50=fe#3,>z_100_50=fe#3); */
+			/* asm 2: fe_sq(>z_100_50=t2,<z_50_0=t1); for (i = 1;i < 50;++i) fe_sq(>z_100_50=t2,>z_100_50=t2); */
+			fe_sq(out t2, ref t1); for (i = 1; i < 50; ++i) fe_sq(out t2, ref t2);
+
+			/* qhasm: z_100_0 = z_100_50*z_50_0 */
+			/* asm 1: fe_mul(>z_100_0=fe#3,<z_100_50=fe#3,<z_50_0=fe#2); */
+			/* asm 2: fe_mul(>z_100_0=t2,<z_100_50=t2,<z_50_0=t1); */
+			fe_mul(out t2, ref t2, ref t1);
+
+			/* qhasm: z_200_100 = z_100_0^2^100 */
+			/* asm 1: fe_sq(>z_200_100=fe#4,<z_100_0=fe#3); for (i = 1;i < 100;++i) fe_sq(>z_200_100=fe#4,>z_200_100=fe#4); */
+			/* asm 2: fe_sq(>z_200_100=t3,<z_100_0=t2); for (i = 1;i < 100;++i) fe_sq(>z_200_100=t3,>z_200_100=t3); */
+			fe_sq(out t3, ref t2); for (i = 1; i < 100; ++i) fe_sq(out t3, ref t3);
+
+			/* qhasm: z_200_0 = z_200_100*z_100_0 */
+			/* asm 1: fe_mul(>z_200_0=fe#3,<z_200_100=fe#4,<z_100_0=fe#3); */
+			/* asm 2: fe_mul(>z_200_0=t2,<z_200_100=t3,<z_100_0=t2); */
+			fe_mul(out t2, ref t3, ref t2);
+
+			/* qhasm: z_250_50 = z_200_0^2^50 */
+			/* asm 1: fe_sq(>z_250_50=fe#3,<z_200_0=fe#3); for (i = 1;i < 50;++i) fe_sq(>z_250_50=fe#3,>z_250_50=fe#3); */
+			/* asm 2: fe_sq(>z_250_50=t2,<z_200_0=t2); for (i = 1;i < 50;++i) fe_sq(>z_250_50=t2,>z_250_50=t2); */
+			fe_sq(out t2, ref t2); for (i = 1; i < 50; ++i) fe_sq(out t2, ref t2);
+
+			/* qhasm: z_250_0 = z_250_50*z_50_0 */
+			/* asm 1: fe_mul(>z_250_0=fe#2,<z_250_50=fe#3,<z_50_0=fe#2); */
+			/* asm 2: fe_mul(>z_250_0=t1,<z_250_50=t2,<z_50_0=t1); */
+			fe_mul(out t1, ref t2, ref t1);
+
+			/* qhasm: z_255_5 = z_250_0^2^5 */
+			/* asm 1: fe_sq(>z_255_5=fe#2,<z_250_0=fe#2); for (i = 1;i < 5;++i) fe_sq(>z_255_5=fe#2,>z_255_5=fe#2); */
+			/* asm 2: fe_sq(>z_255_5=t1,<z_250_0=t1); for (i = 1;i < 5;++i) fe_sq(>z_255_5=t1,>z_255_5=t1); */
+			fe_sq(out t1, ref t1); for (i = 1; i < 5; ++i) fe_sq(out t1, ref t1);
+
+			/* qhasm: z_255_21 = z_255_5*z11 */
+			/* asm 1: fe_mul(>z_255_21=fe#12,<z_255_5=fe#2,<z11=fe#1); */
+			/* asm 2: fe_mul(>z_255_21=out,<z_255_5=t1,<z11=t0); */
+			fe_mul(out result, ref t1, ref t0);
+
+			/* qhasm: return */
+
+
+			return;
+		}
+	}
+}
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_isnegative.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_isnegative.cs
new file mode 100644
index 000000000..950f0c550
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_isnegative.cs
@@ -0,0 +1,22 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+    internal static partial class FieldOperations
+    {
+        /*
+        return 1 if f is in {1,3,5,...,q-2}
+        return 0 if f is in {0,2,4,...,q-1}
+
+        Preconditions:
+        |f| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc.
+        */
+        //int fe_isnegative(const fe f)
+        public static int fe_isnegative(ref FieldElement f)
+        {
+            FieldElement fr;
+            fe_reduce(out fr, ref f);
+            return fr.x0 & 1;
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_isnonzero.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_isnonzero.cs
new file mode 100644
index 000000000..1c3a935fa
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_isnonzero.cs
@@ -0,0 +1,37 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+    internal static partial class FieldOperations
+    {
+        /*
+        return 1 if f == 0
+        return 0 if f != 0
+
+        Preconditions:
+           |f| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc.
+        */
+        // Todo: Discuss this with upstream
+        // Above comment is from the original code. But I believe the original code returned
+        //   0 if f == 0
+        //  -1 if f != 0
+        // This code actually returns 0 if f==0 and 1 if f != 0
+        internal static int fe_isnonzero(ref FieldElement f)
+        {
+            FieldElement fr;
+            fe_reduce(out fr, ref f);
+            int differentBits = 0;
+            differentBits |= fr.x0;
+            differentBits |= fr.x1;
+            differentBits |= fr.x2;
+            differentBits |= fr.x3;
+            differentBits |= fr.x4;
+            differentBits |= fr.x5;
+            differentBits |= fr.x6;
+            differentBits |= fr.x7;
+            differentBits |= fr.x8;
+            differentBits |= fr.x9;
+            return (int)((unchecked((uint)differentBits - 1) >> 31) ^ 1);
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_mul.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_mul.cs
new file mode 100644
index 000000000..d3c755b80
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_mul.cs
@@ -0,0 +1,258 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+	internal static partial class FieldOperations
+	{
+		/*
+		h = f * g
+		Can overlap h with f or g.
+
+		Preconditions:
+		   |f| bounded by 1.65*2^26,1.65*2^25,1.65*2^26,1.65*2^25,etc.
+		   |g| bounded by 1.65*2^26,1.65*2^25,1.65*2^26,1.65*2^25,etc.
+
+		Postconditions:
+		   |h| bounded by 1.01*2^25,1.01*2^24,1.01*2^25,1.01*2^24,etc.
+		*/
+
+		/*
+		Notes on implementation strategy:
+
+		Using schoolbook multiplication.
+		Karatsuba would save a little in some cost models.
+
+		Most multiplications by 2 and 19 are 32-bit precomputations;
+		cheaper than 64-bit postcomputations.
+
+		There is one remaining multiplication by 19 in the carry chain;
+		one *19 precomputation can be merged into this,
+		but the resulting data flow is considerably less clean.
+
+		There are 12 carries below.
+		10 of them are 2-way parallelizable and vectorizable.
+		Can get away with 11 carries, but then data flow is much deeper.
+
+		With tighter constraints on inputs can squeeze carries into int32.
+		*/
+
+		internal static void fe_mul(out FieldElement h, ref FieldElement f, ref FieldElement g)
+		{
+			Int32 f0 = f.x0;
+			Int32 f1 = f.x1;
+			Int32 f2 = f.x2;
+			Int32 f3 = f.x3;
+			Int32 f4 = f.x4;
+			Int32 f5 = f.x5;
+			Int32 f6 = f.x6;
+			Int32 f7 = f.x7;
+			Int32 f8 = f.x8;
+			Int32 f9 = f.x9;
+			Int32 g0 = g.x0;
+			Int32 g1 = g.x1;
+			Int32 g2 = g.x2;
+			Int32 g3 = g.x3;
+			Int32 g4 = g.x4;
+			Int32 g5 = g.x5;
+			Int32 g6 = g.x6;
+			Int32 g7 = g.x7;
+			Int32 g8 = g.x8;
+			Int32 g9 = g.x9;
+			Int32 g1_19 = 19 * g1; /* 1.959375*2^29 */
+			Int32 g2_19 = 19 * g2; /* 1.959375*2^30; still ok */
+			Int32 g3_19 = 19 * g3;
+			Int32 g4_19 = 19 * g4;
+			Int32 g5_19 = 19 * g5;
+			Int32 g6_19 = 19 * g6;
+			Int32 g7_19 = 19 * g7;
+			Int32 g8_19 = 19 * g8;
+			Int32 g9_19 = 19 * g9;
+			Int32 f1_2 = 2 * f1;
+			Int32 f3_2 = 2 * f3;
+			Int32 f5_2 = 2 * f5;
+			Int32 f7_2 = 2 * f7;
+			Int32 f9_2 = 2 * f9;
+			Int64 f0g0 = f0 * (Int64)g0;
+			Int64 f0g1 = f0 * (Int64)g1;
+			Int64 f0g2 = f0 * (Int64)g2;
+			Int64 f0g3 = f0 * (Int64)g3;
+			Int64 f0g4 = f0 * (Int64)g4;
+			Int64 f0g5 = f0 * (Int64)g5;
+			Int64 f0g6 = f0 * (Int64)g6;
+			Int64 f0g7 = f0 * (Int64)g7;
+			Int64 f0g8 = f0 * (Int64)g8;
+			Int64 f0g9 = f0 * (Int64)g9;
+			Int64 f1g0 = f1 * (Int64)g0;
+			Int64 f1g1_2 = f1_2 * (Int64)g1;
+			Int64 f1g2 = f1 * (Int64)g2;
+			Int64 f1g3_2 = f1_2 * (Int64)g3;
+			Int64 f1g4 = f1 * (Int64)g4;
+			Int64 f1g5_2 = f1_2 * (Int64)g5;
+			Int64 f1g6 = f1 * (Int64)g6;
+			Int64 f1g7_2 = f1_2 * (Int64)g7;
+			Int64 f1g8 = f1 * (Int64)g8;
+			Int64 f1g9_38 = f1_2 * (Int64)g9_19;
+			Int64 f2g0 = f2 * (Int64)g0;
+			Int64 f2g1 = f2 * (Int64)g1;
+			Int64 f2g2 = f2 * (Int64)g2;
+			Int64 f2g3 = f2 * (Int64)g3;
+			Int64 f2g4 = f2 * (Int64)g4;
+			Int64 f2g5 = f2 * (Int64)g5;
+			Int64 f2g6 = f2 * (Int64)g6;
+			Int64 f2g7 = f2 * (Int64)g7;
+			Int64 f2g8_19 = f2 * (Int64)g8_19;
+			Int64 f2g9_19 = f2 * (Int64)g9_19;
+			Int64 f3g0 = f3 * (Int64)g0;
+			Int64 f3g1_2 = f3_2 * (Int64)g1;
+			Int64 f3g2 = f3 * (Int64)g2;
+			Int64 f3g3_2 = f3_2 * (Int64)g3;
+			Int64 f3g4 = f3 * (Int64)g4;
+			Int64 f3g5_2 = f3_2 * (Int64)g5;
+			Int64 f3g6 = f3 * (Int64)g6;
+			Int64 f3g7_38 = f3_2 * (Int64)g7_19;
+			Int64 f3g8_19 = f3 * (Int64)g8_19;
+			Int64 f3g9_38 = f3_2 * (Int64)g9_19;
+			Int64 f4g0 = f4 * (Int64)g0;
+			Int64 f4g1 = f4 * (Int64)g1;
+			Int64 f4g2 = f4 * (Int64)g2;
+			Int64 f4g3 = f4 * (Int64)g3;
+			Int64 f4g4 = f4 * (Int64)g4;
+			Int64 f4g5 = f4 * (Int64)g5;
+			Int64 f4g6_19 = f4 * (Int64)g6_19;
+			Int64 f4g7_19 = f4 * (Int64)g7_19;
+			Int64 f4g8_19 = f4 * (Int64)g8_19;
+			Int64 f4g9_19 = f4 * (Int64)g9_19;
+			Int64 f5g0 = f5 * (Int64)g0;
+			Int64 f5g1_2 = f5_2 * (Int64)g1;
+			Int64 f5g2 = f5 * (Int64)g2;
+			Int64 f5g3_2 = f5_2 * (Int64)g3;
+			Int64 f5g4 = f5 * (Int64)g4;
+			Int64 f5g5_38 = f5_2 * (Int64)g5_19;
+			Int64 f5g6_19 = f5 * (Int64)g6_19;
+			Int64 f5g7_38 = f5_2 * (Int64)g7_19;
+			Int64 f5g8_19 = f5 * (Int64)g8_19;
+			Int64 f5g9_38 = f5_2 * (Int64)g9_19;
+			Int64 f6g0 = f6 * (Int64)g0;
+			Int64 f6g1 = f6 * (Int64)g1;
+			Int64 f6g2 = f6 * (Int64)g2;
+			Int64 f6g3 = f6 * (Int64)g3;
+			Int64 f6g4_19 = f6 * (Int64)g4_19;
+			Int64 f6g5_19 = f6 * (Int64)g5_19;
+			Int64 f6g6_19 = f6 * (Int64)g6_19;
+			Int64 f6g7_19 = f6 * (Int64)g7_19;
+			Int64 f6g8_19 = f6 * (Int64)g8_19;
+			Int64 f6g9_19 = f6 * (Int64)g9_19;
+			Int64 f7g0 = f7 * (Int64)g0;
+			Int64 f7g1_2 = f7_2 * (Int64)g1;
+			Int64 f7g2 = f7 * (Int64)g2;
+			Int64 f7g3_38 = f7_2 * (Int64)g3_19;
+			Int64 f7g4_19 = f7 * (Int64)g4_19;
+			Int64 f7g5_38 = f7_2 * (Int64)g5_19;
+			Int64 f7g6_19 = f7 * (Int64)g6_19;
+			Int64 f7g7_38 = f7_2 * (Int64)g7_19;
+			Int64 f7g8_19 = f7 * (Int64)g8_19;
+			Int64 f7g9_38 = f7_2 * (Int64)g9_19;
+			Int64 f8g0 = f8 * (Int64)g0;
+			Int64 f8g1 = f8 * (Int64)g1;
+			Int64 f8g2_19 = f8 * (Int64)g2_19;
+			Int64 f8g3_19 = f8 * (Int64)g3_19;
+			Int64 f8g4_19 = f8 * (Int64)g4_19;
+			Int64 f8g5_19 = f8 * (Int64)g5_19;
+			Int64 f8g6_19 = f8 * (Int64)g6_19;
+			Int64 f8g7_19 = f8 * (Int64)g7_19;
+			Int64 f8g8_19 = f8 * (Int64)g8_19;
+			Int64 f8g9_19 = f8 * (Int64)g9_19;
+			Int64 f9g0 = f9 * (Int64)g0;
+			Int64 f9g1_38 = f9_2 * (Int64)g1_19;
+			Int64 f9g2_19 = f9 * (Int64)g2_19;
+			Int64 f9g3_38 = f9_2 * (Int64)g3_19;
+			Int64 f9g4_19 = f9 * (Int64)g4_19;
+			Int64 f9g5_38 = f9_2 * (Int64)g5_19;
+			Int64 f9g6_19 = f9 * (Int64)g6_19;
+			Int64 f9g7_38 = f9_2 * (Int64)g7_19;
+			Int64 f9g8_19 = f9 * (Int64)g8_19;
+			Int64 f9g9_38 = f9_2 * (Int64)g9_19;
+			Int64 h0 = f0g0 + f1g9_38 + f2g8_19 + f3g7_38 + f4g6_19 + f5g5_38 + f6g4_19 + f7g3_38 + f8g2_19 + f9g1_38;
+			Int64 h1 = f0g1 + f1g0 + f2g9_19 + f3g8_19 + f4g7_19 + f5g6_19 + f6g5_19 + f7g4_19 + f8g3_19 + f9g2_19;
+			Int64 h2 = f0g2 + f1g1_2 + f2g0 + f3g9_38 + f4g8_19 + f5g7_38 + f6g6_19 + f7g5_38 + f8g4_19 + f9g3_38;
+			Int64 h3 = f0g3 + f1g2 + f2g1 + f3g0 + f4g9_19 + f5g8_19 + f6g7_19 + f7g6_19 + f8g5_19 + f9g4_19;
+			Int64 h4 = f0g4 + f1g3_2 + f2g2 + f3g1_2 + f4g0 + f5g9_38 + f6g8_19 + f7g7_38 + f8g6_19 + f9g5_38;
+			Int64 h5 = f0g5 + f1g4 + f2g3 + f3g2 + f4g1 + f5g0 + f6g9_19 + f7g8_19 + f8g7_19 + f9g6_19;
+			Int64 h6 = f0g6 + f1g5_2 + f2g4 + f3g3_2 + f4g2 + f5g1_2 + f6g0 + f7g9_38 + f8g8_19 + f9g7_38;
+			Int64 h7 = f0g7 + f1g6 + f2g5 + f3g4 + f4g3 + f5g2 + f6g1 + f7g0 + f8g9_19 + f9g8_19;
+			Int64 h8 = f0g8 + f1g7_2 + f2g6 + f3g5_2 + f4g4 + f5g3_2 + f6g2 + f7g1_2 + f8g0 + f9g9_38;
+			Int64 h9 = f0g9 + f1g8 + f2g7 + f3g6 + f4g5 + f5g4 + f6g3 + f7g2 + f8g1 + f9g0;
+			Int64 carry0;
+			Int64 carry1;
+			Int64 carry2;
+			Int64 carry3;
+			Int64 carry4;
+			Int64 carry5;
+			Int64 carry6;
+			Int64 carry7;
+			Int64 carry8;
+			Int64 carry9;
+
+			/*
+			|h0| <= (1.65*1.65*2^52*(1+19+19+19+19)+1.65*1.65*2^50*(38+38+38+38+38))
+			  i.e. |h0| <= 1.4*2^60; narrower ranges for h2, h4, h6, h8
+			|h1| <= (1.65*1.65*2^51*(1+1+19+19+19+19+19+19+19+19))
+			  i.e. |h1| <= 1.7*2^59; narrower ranges for h3, h5, h7, h9
+			*/
+
+			carry0 = (h0 + (Int64)(1 << 25)) >> 26; h1 += carry0; h0 -= carry0 << 26;
+			carry4 = (h4 + (Int64)(1 << 25)) >> 26; h5 += carry4; h4 -= carry4 << 26;
+			/* |h0| <= 2^25 */
+			/* |h4| <= 2^25 */
+			/* |h1| <= 1.71*2^59 */
+			/* |h5| <= 1.71*2^59 */
+
+			carry1 = (h1 + (Int64)(1 << 24)) >> 25; h2 += carry1; h1 -= carry1 << 25;
+			carry5 = (h5 + (Int64)(1 << 24)) >> 25; h6 += carry5; h5 -= carry5 << 25;
+			/* |h1| <= 2^24; from now on fits into int32 */
+			/* |h5| <= 2^24; from now on fits into int32 */
+			/* |h2| <= 1.41*2^60 */
+			/* |h6| <= 1.41*2^60 */
+
+			carry2 = (h2 + (Int64)(1 << 25)) >> 26; h3 += carry2; h2 -= carry2 << 26;
+			carry6 = (h6 + (Int64)(1 << 25)) >> 26; h7 += carry6; h6 -= carry6 << 26;
+			/* |h2| <= 2^25; from now on fits into int32 unchanged */
+			/* |h6| <= 2^25; from now on fits into int32 unchanged */
+			/* |h3| <= 1.71*2^59 */
+			/* |h7| <= 1.71*2^59 */
+
+			carry3 = (h3 + (Int64)(1 << 24)) >> 25; h4 += carry3; h3 -= carry3 << 25;
+			carry7 = (h7 + (Int64)(1 << 24)) >> 25; h8 += carry7; h7 -= carry7 << 25;
+			/* |h3| <= 2^24; from now on fits into int32 unchanged */
+			/* |h7| <= 2^24; from now on fits into int32 unchanged */
+			/* |h4| <= 1.72*2^34 */
+			/* |h8| <= 1.41*2^60 */
+
+			carry4 = (h4 + (Int64)(1 << 25)) >> 26; h5 += carry4; h4 -= carry4 << 26;
+			carry8 = (h8 + (Int64)(1 << 25)) >> 26; h9 += carry8; h8 -= carry8 << 26;
+			/* |h4| <= 2^25; from now on fits into int32 unchanged */
+			/* |h8| <= 2^25; from now on fits into int32 unchanged */
+			/* |h5| <= 1.01*2^24 */
+			/* |h9| <= 1.71*2^59 */
+
+			carry9 = (h9 + (Int64)(1 << 24)) >> 25; h0 += carry9 * 19; h9 -= carry9 << 25;
+			/* |h9| <= 2^24; from now on fits into int32 unchanged */
+			/* |h0| <= 1.1*2^39 */
+
+			carry0 = (h0 + (Int64)(1 << 25)) >> 26; h1 += carry0; h0 -= carry0 << 26;
+			/* |h0| <= 2^25; from now on fits into int32 unchanged */
+			/* |h1| <= 1.01*2^24 */
+
+			h.x0 = (Int32)h0;
+			h.x1 = (Int32)h1;
+			h.x2 = (Int32)h2;
+			h.x3 = (Int32)h3;
+			h.x4 = (Int32)h4;
+			h.x5 = (Int32)h5;
+			h.x6 = (Int32)h6;
+			h.x7 = (Int32)h7;
+			h.x8 = (Int32)h8;
+			h.x9 = (Int32)h9;
+		}
+	}
+}
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_mul121666.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_mul121666.cs
new file mode 100644
index 000000000..91325273c
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_mul121666.cs
@@ -0,0 +1,76 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+	internal static partial class FieldOperations
+	{
+
+		/*
+		h = f * 121666
+		Can overlap h with f.
+
+		Preconditions:
+		   |f| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc.
+
+		Postconditions:
+		   |h| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
+		*/
+
+		public static void fe_mul121666(out FieldElement h, ref FieldElement f)
+		{
+			Int32 f0 = f.x0;
+			Int32 f1 = f.x1;
+			Int32 f2 = f.x2;
+			Int32 f3 = f.x3;
+			Int32 f4 = f.x4;
+			Int32 f5 = f.x5;
+			Int32 f6 = f.x6;
+			Int32 f7 = f.x7;
+			Int32 f8 = f.x8;
+			Int32 f9 = f.x9;
+			Int64 h0 = f0 * (Int64)121666;
+			Int64 h1 = f1 * (Int64)121666;
+			Int64 h2 = f2 * (Int64)121666;
+			Int64 h3 = f3 * (Int64)121666;
+			Int64 h4 = f4 * (Int64)121666;
+			Int64 h5 = f5 * (Int64)121666;
+			Int64 h6 = f6 * (Int64)121666;
+			Int64 h7 = f7 * (Int64)121666;
+			Int64 h8 = f8 * (Int64)121666;
+			Int64 h9 = f9 * (Int64)121666;
+			Int64 carry0;
+			Int64 carry1;
+			Int64 carry2;
+			Int64 carry3;
+			Int64 carry4;
+			Int64 carry5;
+			Int64 carry6;
+			Int64 carry7;
+			Int64 carry8;
+			Int64 carry9;
+
+			carry9 = (h9 + (Int64)(1 << 24)) >> 25; h0 += carry9 * 19; h9 -= carry9 << 25;
+			carry1 = (h1 + (Int64)(1 << 24)) >> 25; h2 += carry1; h1 -= carry1 << 25;
+			carry3 = (h3 + (Int64)(1 << 24)) >> 25; h4 += carry3; h3 -= carry3 << 25;
+			carry5 = (h5 + (Int64)(1 << 24)) >> 25; h6 += carry5; h5 -= carry5 << 25;
+			carry7 = (h7 + (Int64)(1 << 24)) >> 25; h8 += carry7; h7 -= carry7 << 25;
+
+			carry0 = (h0 + (Int64)(1 << 25)) >> 26; h1 += carry0; h0 -= carry0 << 26;
+			carry2 = (h2 + (Int64)(1 << 25)) >> 26; h3 += carry2; h2 -= carry2 << 26;
+			carry4 = (h4 + (Int64)(1 << 25)) >> 26; h5 += carry4; h4 -= carry4 << 26;
+			carry6 = (h6 + (Int64)(1 << 25)) >> 26; h7 += carry6; h6 -= carry6 << 26;
+			carry8 = (h8 + (Int64)(1 << 25)) >> 26; h9 += carry8; h8 -= carry8 << 26;
+
+			h.x0 = (int)h0;
+			h.x1 = (int)h1;
+			h.x2 = (int)h2;
+			h.x3 = (int)h3;
+			h.x4 = (int)h4;
+			h.x5 = (int)h5;
+			h.x6 = (int)h6;
+			h.x7 = (int)h7;
+			h.x8 = (int)h8;
+			h.x9 = (int)h9;
+		}
+	}
+}
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_neg.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_neg.cs
new file mode 100644
index 000000000..64665ec55
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_neg.cs
@@ -0,0 +1,50 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+	internal static partial class FieldOperations
+	{
+		/*
+		h = -f
+
+		Preconditions:
+		   |f| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
+
+		Postconditions:
+		   |h| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
+		*/
+		internal static void fe_neg(out FieldElement h, ref FieldElement f)
+		{
+			Int32 f0 = f.x0;
+			Int32 f1 = f.x1;
+			Int32 f2 = f.x2;
+			Int32 f3 = f.x3;
+			Int32 f4 = f.x4;
+			Int32 f5 = f.x5;
+			Int32 f6 = f.x6;
+			Int32 f7 = f.x7;
+			Int32 f8 = f.x8;
+			Int32 f9 = f.x9;
+			Int32 h0 = -f0;
+			Int32 h1 = -f1;
+			Int32 h2 = -f2;
+			Int32 h3 = -f3;
+			Int32 h4 = -f4;
+			Int32 h5 = -f5;
+			Int32 h6 = -f6;
+			Int32 h7 = -f7;
+			Int32 h8 = -f8;
+			Int32 h9 = -f9;
+			h.x0 = h0;
+			h.x1 = h1;
+			h.x2 = h2;
+			h.x3 = h3;
+			h.x4 = h4;
+			h.x5 = h5;
+			h.x6 = h6;
+			h.x7 = h7;
+			h.x8 = h8;
+			h.x9 = h9;
+		}
+	}
+}
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_pow22523.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_pow22523.cs
new file mode 100644
index 000000000..5018f6dcd
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_pow22523.cs
@@ -0,0 +1,175 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+	internal static partial class FieldOperations
+	{
+		internal static void fe_pow22523(out FieldElement result, ref FieldElement z)
+		{
+			FieldElement t0;
+			FieldElement t1;
+			FieldElement t2;
+			int i;
+
+			/* qhasm: fe z1 */
+
+			/* qhasm: fe z2 */
+
+			/* qhasm: fe z8 */
+
+			/* qhasm: fe z9 */
+
+			/* qhasm: fe z11 */
+
+			/* qhasm: fe z22 */
+
+			/* qhasm: fe z_5_0 */
+
+			/* qhasm: fe z_10_5 */
+
+			/* qhasm: fe z_10_0 */
+
+			/* qhasm: fe z_20_10 */
+
+			/* qhasm: fe z_20_0 */
+
+			/* qhasm: fe z_40_20 */
+
+			/* qhasm: fe z_40_0 */
+
+			/* qhasm: fe z_50_10 */
+
+			/* qhasm: fe z_50_0 */
+
+			/* qhasm: fe z_100_50 */
+
+			/* qhasm: fe z_100_0 */
+
+			/* qhasm: fe z_200_100 */
+
+			/* qhasm: fe z_200_0 */
+
+			/* qhasm: fe z_250_50 */
+
+			/* qhasm: fe z_250_0 */
+
+			/* qhasm: fe z_252_2 */
+
+			/* qhasm: fe z_252_3 */
+
+			/* qhasm: enter pow22523 */
+
+			/* qhasm: z2 = z1^2^1 */
+			/* asm 1: fe_sq(>z2=fe#1,<z1=fe#11); for (i = 1;i < 1;++i) fe_sq(>z2=fe#1,>z2=fe#1); */
+			/* asm 2: fe_sq(>z2=t0,<z1=z); for (i = 1;i < 1;++i) fe_sq(>z2=t0,>z2=t0); */
+			fe_sq(out t0, ref z); //for (i = 1; i < 1; ++i) fe_sq(out t0, ref t0);
+
+			/* qhasm: z8 = z2^2^2 */
+			/* asm 1: fe_sq(>z8=fe#2,<z2=fe#1); for (i = 1;i < 2;++i) fe_sq(>z8=fe#2,>z8=fe#2); */
+			/* asm 2: fe_sq(>z8=t1,<z2=t0); for (i = 1;i < 2;++i) fe_sq(>z8=t1,>z8=t1); */
+			fe_sq(out t1, ref t0); for (i = 1; i < 2; ++i) fe_sq(out t1, ref t1);
+
+			/* qhasm: z9 = z1*z8 */
+			/* asm 1: fe_mul(>z9=fe#2,<z1=fe#11,<z8=fe#2); */
+			/* asm 2: fe_mul(>z9=t1,<z1=z,<z8=t1); */
+			fe_mul(out t1, ref z, ref t1);
+
+			/* qhasm: z11 = z2*z9 */
+			/* asm 1: fe_mul(>z11=fe#1,<z2=fe#1,<z9=fe#2); */
+			/* asm 2: fe_mul(>z11=t0,<z2=t0,<z9=t1); */
+			fe_mul(out t0, ref  t0, ref  t1);
+
+			/* qhasm: z22 = z11^2^1 */
+			/* asm 1: fe_sq(>z22=fe#1,<z11=fe#1); for (i = 1;i < 1;++i) fe_sq(>z22=fe#1,>z22=fe#1); */
+			/* asm 2: fe_sq(>z22=t0,<z11=t0); for (i = 1;i < 1;++i) fe_sq(>z22=t0,>z22=t0); */
+			fe_sq(out t0, ref t0); //for (i = 1; i < 1; ++i) fe_sq(out t0, ref  t0);
+
+			/* qhasm: z_5_0 = z9*z22 */
+			/* asm 1: fe_mul(>z_5_0=fe#1,<z9=fe#2,<z22=fe#1); */
+			/* asm 2: fe_mul(>z_5_0=t0,<z9=t1,<z22=t0); */
+			fe_mul(out t0, ref t1, ref  t0);
+
+			/* qhasm: z_10_5 = z_5_0^2^5 */
+			/* asm 1: fe_sq(>z_10_5=fe#2,<z_5_0=fe#1); for (i = 1;i < 5;++i) fe_sq(>z_10_5=fe#2,>z_10_5=fe#2); */
+			/* asm 2: fe_sq(>z_10_5=t1,<z_5_0=t0); for (i = 1;i < 5;++i) fe_sq(>z_10_5=t1,>z_10_5=t1); */
+			fe_sq(out t1, ref t0); for (i = 1; i < 5; ++i) fe_sq(out t1, ref  t1);
+
+			/* qhasm: z_10_0 = z_10_5*z_5_0 */
+			/* asm 1: fe_mul(>z_10_0=fe#1,<z_10_5=fe#2,<z_5_0=fe#1); */
+			/* asm 2: fe_mul(>z_10_0=t0,<z_10_5=t1,<z_5_0=t0); */
+			fe_mul(out t0, ref  t1, ref  t0);
+
+			/* qhasm: z_20_10 = z_10_0^2^10 */
+			/* asm 1: fe_sq(>z_20_10=fe#2,<z_10_0=fe#1); for (i = 1;i < 10;++i) fe_sq(>z_20_10=fe#2,>z_20_10=fe#2); */
+			/* asm 2: fe_sq(>z_20_10=t1,<z_10_0=t0); for (i = 1;i < 10;++i) fe_sq(>z_20_10=t1,>z_20_10=t1); */
+			fe_sq(out t1, ref  t0); for (i = 1; i < 10; ++i) fe_sq(out t1, ref  t1);
+
+			/* qhasm: z_20_0 = z_20_10*z_10_0 */
+			/* asm 1: fe_mul(>z_20_0=fe#2,<z_20_10=fe#2,<z_10_0=fe#1); */
+			/* asm 2: fe_mul(>z_20_0=t1,<z_20_10=t1,<z_10_0=t0); */
+			fe_mul(out t1, ref  t1, ref  t0);
+
+			/* qhasm: z_40_20 = z_20_0^2^20 */
+			/* asm 1: fe_sq(>z_40_20=fe#3,<z_20_0=fe#2); for (i = 1;i < 20;++i) fe_sq(>z_40_20=fe#3,>z_40_20=fe#3); */
+			/* asm 2: fe_sq(>z_40_20=t2,<z_20_0=t1); for (i = 1;i < 20;++i) fe_sq(>z_40_20=t2,>z_40_20=t2); */
+			fe_sq(out t2, ref  t1); for (i = 1; i < 20; ++i) fe_sq(out t2, ref  t2);
+
+			/* qhasm: z_40_0 = z_40_20*z_20_0 */
+			/* asm 1: fe_mul(>z_40_0=fe#2,<z_40_20=fe#3,<z_20_0=fe#2); */
+			/* asm 2: fe_mul(>z_40_0=t1,<z_40_20=t2,<z_20_0=t1); */
+			fe_mul(out t1, ref t2, ref  t1);
+
+			/* qhasm: z_50_10 = z_40_0^2^10 */
+			/* asm 1: fe_sq(>z_50_10=fe#2,<z_40_0=fe#2); for (i = 1;i < 10;++i) fe_sq(>z_50_10=fe#2,>z_50_10=fe#2); */
+			/* asm 2: fe_sq(>z_50_10=t1,<z_40_0=t1); for (i = 1;i < 10;++i) fe_sq(>z_50_10=t1,>z_50_10=t1); */
+			fe_sq(out t1, ref t1); for (i = 1; i < 10; ++i) fe_sq(out t1, ref t1);
+
+			/* qhasm: z_50_0 = z_50_10*z_10_0 */
+			/* asm 1: fe_mul(>z_50_0=fe#1,<z_50_10=fe#2,<z_10_0=fe#1); */
+			/* asm 2: fe_mul(>z_50_0=t0,<z_50_10=t1,<z_10_0=t0); */
+			fe_mul(out t0, ref  t1, ref  t0);
+
+			/* qhasm: z_100_50 = z_50_0^2^50 */
+			/* asm 1: fe_sq(>z_100_50=fe#2,<z_50_0=fe#1); for (i = 1;i < 50;++i) fe_sq(>z_100_50=fe#2,>z_100_50=fe#2); */
+			/* asm 2: fe_sq(>z_100_50=t1,<z_50_0=t0); for (i = 1;i < 50;++i) fe_sq(>z_100_50=t1,>z_100_50=t1); */
+			fe_sq(out t1, ref  t0); for (i = 1; i < 50; ++i) fe_sq(out t1, ref  t1);
+
+			/* qhasm: z_100_0 = z_100_50*z_50_0 */
+			/* asm 1: fe_mul(>z_100_0=fe#2,<z_100_50=fe#2,<z_50_0=fe#1); */
+			/* asm 2: fe_mul(>z_100_0=t1,<z_100_50=t1,<z_50_0=t0); */
+			fe_mul(out t1, ref t1, ref  t0);
+
+			/* qhasm: z_200_100 = z_100_0^2^100 */
+			/* asm 1: fe_sq(>z_200_100=fe#3,<z_100_0=fe#2); for (i = 1;i < 100;++i) fe_sq(>z_200_100=fe#3,>z_200_100=fe#3); */
+			/* asm 2: fe_sq(>z_200_100=t2,<z_100_0=t1); for (i = 1;i < 100;++i) fe_sq(>z_200_100=t2,>z_200_100=t2); */
+			fe_sq(out t2, ref  t1); for (i = 1; i < 100; ++i) fe_sq(out t2, ref  t2);
+
+			/* qhasm: z_200_0 = z_200_100*z_100_0 */
+			/* asm 1: fe_mul(>z_200_0=fe#2,<z_200_100=fe#3,<z_100_0=fe#2); */
+			/* asm 2: fe_mul(>z_200_0=t1,<z_200_100=t2,<z_100_0=t1); */
+			fe_mul(out t1, ref  t2, ref  t1);
+
+			/* qhasm: z_250_50 = z_200_0^2^50 */
+			/* asm 1: fe_sq(>z_250_50=fe#2,<z_200_0=fe#2); for (i = 1;i < 50;++i) fe_sq(>z_250_50=fe#2,>z_250_50=fe#2); */
+			/* asm 2: fe_sq(>z_250_50=t1,<z_200_0=t1); for (i = 1;i < 50;++i) fe_sq(>z_250_50=t1,>z_250_50=t1); */
+			fe_sq(out t1, ref t1); for (i = 1; i < 50; ++i) fe_sq(out t1, ref t1);
+
+			/* qhasm: z_250_0 = z_250_50*z_50_0 */
+			/* asm 1: fe_mul(>z_250_0=fe#1,<z_250_50=fe#2,<z_50_0=fe#1); */
+			/* asm 2: fe_mul(>z_250_0=t0,<z_250_50=t1,<z_50_0=t0); */
+			fe_mul(out t0, ref  t1, ref  t0);
+
+			/* qhasm: z_252_2 = z_250_0^2^2 */
+			/* asm 1: fe_sq(>z_252_2=fe#1,<z_250_0=fe#1); for (i = 1;i < 2;++i) fe_sq(>z_252_2=fe#1,>z_252_2=fe#1); */
+			/* asm 2: fe_sq(>z_252_2=t0,<z_250_0=t0); for (i = 1;i < 2;++i) fe_sq(>z_252_2=t0,>z_252_2=t0); */
+			fe_sq(out t0, ref  t0); for (i = 1; i < 2; ++i) fe_sq(out t0, ref t0);
+
+			/* qhasm: z_252_3 = z_252_2*z1 */
+			/* asm 1: fe_mul(>z_252_3=fe#12,<z_252_2=fe#1,<z1=fe#11); */
+			/* asm 2: fe_mul(>z_252_3=out,<z_252_2=t0,<z1=z); */
+			fe_mul(out result, ref  t0, ref z);
+
+			/* qhasm: return */
+		}
+	}
+}
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_sq.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_sq.cs
new file mode 100644
index 000000000..4770de5d4
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_sq.cs
@@ -0,0 +1,153 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+	internal static partial class FieldOperations
+	{
+		/*
+		h = f * f
+		Can overlap h with f.
+
+		Preconditions:
+		   |f| bounded by 1.65*2^26,1.65*2^25,1.65*2^26,1.65*2^25,etc.
+
+		Postconditions:
+		   |h| bounded by 1.01*2^25,1.01*2^24,1.01*2^25,1.01*2^24,etc.
+		*/
+
+		/*
+		See fe_mul.c for discussion of implementation strategy.
+		*/
+		internal static void fe_sq(out FieldElement h, ref FieldElement f)
+		{
+			Int32 f0 = f.x0;
+			Int32 f1 = f.x1;
+			Int32 f2 = f.x2;
+			Int32 f3 = f.x3;
+			Int32 f4 = f.x4;
+			Int32 f5 = f.x5;
+			Int32 f6 = f.x6;
+			Int32 f7 = f.x7;
+			Int32 f8 = f.x8;
+			Int32 f9 = f.x9;
+			Int32 f0_2 = 2 * f0;
+			Int32 f1_2 = 2 * f1;
+			Int32 f2_2 = 2 * f2;
+			Int32 f3_2 = 2 * f3;
+			Int32 f4_2 = 2 * f4;
+			Int32 f5_2 = 2 * f5;
+			Int32 f6_2 = 2 * f6;
+			Int32 f7_2 = 2 * f7;
+			Int32 f5_38 = 38 * f5; /* 1.959375*2^30 */
+			Int32 f6_19 = 19 * f6; /* 1.959375*2^30 */
+			Int32 f7_38 = 38 * f7; /* 1.959375*2^30 */
+			Int32 f8_19 = 19 * f8; /* 1.959375*2^30 */
+			Int32 f9_38 = 38 * f9; /* 1.959375*2^30 */
+			Int64 f0f0 = f0 * (Int64)f0;
+			Int64 f0f1_2 = f0_2 * (Int64)f1;
+			Int64 f0f2_2 = f0_2 * (Int64)f2;
+			Int64 f0f3_2 = f0_2 * (Int64)f3;
+			Int64 f0f4_2 = f0_2 * (Int64)f4;
+			Int64 f0f5_2 = f0_2 * (Int64)f5;
+			Int64 f0f6_2 = f0_2 * (Int64)f6;
+			Int64 f0f7_2 = f0_2 * (Int64)f7;
+			Int64 f0f8_2 = f0_2 * (Int64)f8;
+			Int64 f0f9_2 = f0_2 * (Int64)f9;
+			Int64 f1f1_2 = f1_2 * (Int64)f1;
+			Int64 f1f2_2 = f1_2 * (Int64)f2;
+			Int64 f1f3_4 = f1_2 * (Int64)f3_2;
+			Int64 f1f4_2 = f1_2 * (Int64)f4;
+			Int64 f1f5_4 = f1_2 * (Int64)f5_2;
+			Int64 f1f6_2 = f1_2 * (Int64)f6;
+			Int64 f1f7_4 = f1_2 * (Int64)f7_2;
+			Int64 f1f8_2 = f1_2 * (Int64)f8;
+			Int64 f1f9_76 = f1_2 * (Int64)f9_38;
+			Int64 f2f2 = f2 * (Int64)f2;
+			Int64 f2f3_2 = f2_2 * (Int64)f3;
+			Int64 f2f4_2 = f2_2 * (Int64)f4;
+			Int64 f2f5_2 = f2_2 * (Int64)f5;
+			Int64 f2f6_2 = f2_2 * (Int64)f6;
+			Int64 f2f7_2 = f2_2 * (Int64)f7;
+			Int64 f2f8_38 = f2_2 * (Int64)f8_19;
+			Int64 f2f9_38 = f2 * (Int64)f9_38;
+			Int64 f3f3_2 = f3_2 * (Int64)f3;
+			Int64 f3f4_2 = f3_2 * (Int64)f4;
+			Int64 f3f5_4 = f3_2 * (Int64)f5_2;
+			Int64 f3f6_2 = f3_2 * (Int64)f6;
+			Int64 f3f7_76 = f3_2 * (Int64)f7_38;
+			Int64 f3f8_38 = f3_2 * (Int64)f8_19;
+			Int64 f3f9_76 = f3_2 * (Int64)f9_38;
+			Int64 f4f4 = f4 * (Int64)f4;
+			Int64 f4f5_2 = f4_2 * (Int64)f5;
+			Int64 f4f6_38 = f4_2 * (Int64)f6_19;
+			Int64 f4f7_38 = f4 * (Int64)f7_38;
+			Int64 f4f8_38 = f4_2 * (Int64)f8_19;
+			Int64 f4f9_38 = f4 * (Int64)f9_38;
+			Int64 f5f5_38 = f5 * (Int64)f5_38;
+			Int64 f5f6_38 = f5_2 * (Int64)f6_19;
+			Int64 f5f7_76 = f5_2 * (Int64)f7_38;
+			Int64 f5f8_38 = f5_2 * (Int64)f8_19;
+			Int64 f5f9_76 = f5_2 * (Int64)f9_38;
+			Int64 f6f6_19 = f6 * (Int64)f6_19;
+			Int64 f6f7_38 = f6 * (Int64)f7_38;
+			Int64 f6f8_38 = f6_2 * (Int64)f8_19;
+			Int64 f6f9_38 = f6 * (Int64)f9_38;
+			Int64 f7f7_38 = f7 * (Int64)f7_38;
+			Int64 f7f8_38 = f7_2 * (Int64)f8_19;
+			Int64 f7f9_76 = f7_2 * (Int64)f9_38;
+			Int64 f8f8_19 = f8 * (Int64)f8_19;
+			Int64 f8f9_38 = f8 * (Int64)f9_38;
+			Int64 f9f9_38 = f9 * (Int64)f9_38;
+			Int64 h0 = f0f0 + f1f9_76 + f2f8_38 + f3f7_76 + f4f6_38 + f5f5_38;
+			Int64 h1 = f0f1_2 + f2f9_38 + f3f8_38 + f4f7_38 + f5f6_38;
+			Int64 h2 = f0f2_2 + f1f1_2 + f3f9_76 + f4f8_38 + f5f7_76 + f6f6_19;
+			Int64 h3 = f0f3_2 + f1f2_2 + f4f9_38 + f5f8_38 + f6f7_38;
+			Int64 h4 = f0f4_2 + f1f3_4 + f2f2 + f5f9_76 + f6f8_38 + f7f7_38;
+			Int64 h5 = f0f5_2 + f1f4_2 + f2f3_2 + f6f9_38 + f7f8_38;
+			Int64 h6 = f0f6_2 + f1f5_4 + f2f4_2 + f3f3_2 + f7f9_76 + f8f8_19;
+			Int64 h7 = f0f7_2 + f1f6_2 + f2f5_2 + f3f4_2 + f8f9_38;
+			Int64 h8 = f0f8_2 + f1f7_4 + f2f6_2 + f3f5_4 + f4f4 + f9f9_38;
+			Int64 h9 = f0f9_2 + f1f8_2 + f2f7_2 + f3f6_2 + f4f5_2;
+			Int64 carry0;
+			Int64 carry1;
+			Int64 carry2;
+			Int64 carry3;
+			Int64 carry4;
+			Int64 carry5;
+			Int64 carry6;
+			Int64 carry7;
+			Int64 carry8;
+			Int64 carry9;
+
+			carry0 = (h0 + (Int64)(1 << 25)) >> 26; h1 += carry0; h0 -= carry0 << 26;
+			carry4 = (h4 + (Int64)(1 << 25)) >> 26; h5 += carry4; h4 -= carry4 << 26;
+
+			carry1 = (h1 + (Int64)(1 << 24)) >> 25; h2 += carry1; h1 -= carry1 << 25;
+			carry5 = (h5 + (Int64)(1 << 24)) >> 25; h6 += carry5; h5 -= carry5 << 25;
+
+			carry2 = (h2 + (Int64)(1 << 25)) >> 26; h3 += carry2; h2 -= carry2 << 26;
+			carry6 = (h6 + (Int64)(1 << 25)) >> 26; h7 += carry6; h6 -= carry6 << 26;
+
+			carry3 = (h3 + (Int64)(1 << 24)) >> 25; h4 += carry3; h3 -= carry3 << 25;
+			carry7 = (h7 + (Int64)(1 << 24)) >> 25; h8 += carry7; h7 -= carry7 << 25;
+
+			carry4 = (h4 + (Int64)(1 << 25)) >> 26; h5 += carry4; h4 -= carry4 << 26;
+			carry8 = (h8 + (Int64)(1 << 25)) >> 26; h9 += carry8; h8 -= carry8 << 26;
+
+			carry9 = (h9 + (Int64)(1 << 24)) >> 25; h0 += carry9 * 19; h9 -= carry9 << 25;
+
+			carry0 = (h0 + (Int64)(1 << 25)) >> 26; h1 += carry0; h0 -= carry0 << 26;
+
+			h.x0 = (Int32)h0;
+			h.x1 = (Int32)h1;
+			h.x2 = (Int32)h2;
+			h.x3 = (Int32)h3;
+			h.x4 = (Int32)h4;
+			h.x5 = (Int32)h5;
+			h.x6 = (Int32)h6;
+			h.x7 = (Int32)h7;
+			h.x8 = (Int32)h8;
+			h.x9 = (Int32)h9;
+		}
+	}
+}
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_sq2.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_sq2.cs
new file mode 100644
index 000000000..40913bb7a
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_sq2.cs
@@ -0,0 +1,164 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+	internal static partial class FieldOperations
+	{
+		/*
+h = 2 * f * f
+Can overlap h with f.
+
+Preconditions:
+   |f| bounded by 1.65*2^26,1.65*2^25,1.65*2^26,1.65*2^25,etc.
+
+Postconditions:
+   |h| bounded by 1.01*2^25,1.01*2^24,1.01*2^25,1.01*2^24,etc.
+*/
+
+		/*
+		See fe_mul.c for discussion of implementation strategy.
+		*/
+		internal static void fe_sq2(out FieldElement h, ref FieldElement f)
+		{
+			Int32 f0 = f.x0;
+			Int32 f1 = f.x1;
+			Int32 f2 = f.x2;
+			Int32 f3 = f.x3;
+			Int32 f4 = f.x4;
+			Int32 f5 = f.x5;
+			Int32 f6 = f.x6;
+			Int32 f7 = f.x7;
+			Int32 f8 = f.x8;
+			Int32 f9 = f.x9;
+			Int32 f0_2 = 2 * f0;
+			Int32 f1_2 = 2 * f1;
+			Int32 f2_2 = 2 * f2;
+			Int32 f3_2 = 2 * f3;
+			Int32 f4_2 = 2 * f4;
+			Int32 f5_2 = 2 * f5;
+			Int32 f6_2 = 2 * f6;
+			Int32 f7_2 = 2 * f7;
+			Int32 f5_38 = 38 * f5; /* 1.959375*2^30 */
+			Int32 f6_19 = 19 * f6; /* 1.959375*2^30 */
+			Int32 f7_38 = 38 * f7; /* 1.959375*2^30 */
+			Int32 f8_19 = 19 * f8; /* 1.959375*2^30 */
+			Int32 f9_38 = 38 * f9; /* 1.959375*2^30 */
+			Int64 f0f0 = f0 * (Int64)f0;
+			Int64 f0f1_2 = f0_2 * (Int64)f1;
+			Int64 f0f2_2 = f0_2 * (Int64)f2;
+			Int64 f0f3_2 = f0_2 * (Int64)f3;
+			Int64 f0f4_2 = f0_2 * (Int64)f4;
+			Int64 f0f5_2 = f0_2 * (Int64)f5;
+			Int64 f0f6_2 = f0_2 * (Int64)f6;
+			Int64 f0f7_2 = f0_2 * (Int64)f7;
+			Int64 f0f8_2 = f0_2 * (Int64)f8;
+			Int64 f0f9_2 = f0_2 * (Int64)f9;
+			Int64 f1f1_2 = f1_2 * (Int64)f1;
+			Int64 f1f2_2 = f1_2 * (Int64)f2;
+			Int64 f1f3_4 = f1_2 * (Int64)f3_2;
+			Int64 f1f4_2 = f1_2 * (Int64)f4;
+			Int64 f1f5_4 = f1_2 * (Int64)f5_2;
+			Int64 f1f6_2 = f1_2 * (Int64)f6;
+			Int64 f1f7_4 = f1_2 * (Int64)f7_2;
+			Int64 f1f8_2 = f1_2 * (Int64)f8;
+			Int64 f1f9_76 = f1_2 * (Int64)f9_38;
+			Int64 f2f2 = f2 * (Int64)f2;
+			Int64 f2f3_2 = f2_2 * (Int64)f3;
+			Int64 f2f4_2 = f2_2 * (Int64)f4;
+			Int64 f2f5_2 = f2_2 * (Int64)f5;
+			Int64 f2f6_2 = f2_2 * (Int64)f6;
+			Int64 f2f7_2 = f2_2 * (Int64)f7;
+			Int64 f2f8_38 = f2_2 * (Int64)f8_19;
+			Int64 f2f9_38 = f2 * (Int64)f9_38;
+			Int64 f3f3_2 = f3_2 * (Int64)f3;
+			Int64 f3f4_2 = f3_2 * (Int64)f4;
+			Int64 f3f5_4 = f3_2 * (Int64)f5_2;
+			Int64 f3f6_2 = f3_2 * (Int64)f6;
+			Int64 f3f7_76 = f3_2 * (Int64)f7_38;
+			Int64 f3f8_38 = f3_2 * (Int64)f8_19;
+			Int64 f3f9_76 = f3_2 * (Int64)f9_38;
+			Int64 f4f4 = f4 * (Int64)f4;
+			Int64 f4f5_2 = f4_2 * (Int64)f5;
+			Int64 f4f6_38 = f4_2 * (Int64)f6_19;
+			Int64 f4f7_38 = f4 * (Int64)f7_38;
+			Int64 f4f8_38 = f4_2 * (Int64)f8_19;
+			Int64 f4f9_38 = f4 * (Int64)f9_38;
+			Int64 f5f5_38 = f5 * (Int64)f5_38;
+			Int64 f5f6_38 = f5_2 * (Int64)f6_19;
+			Int64 f5f7_76 = f5_2 * (Int64)f7_38;
+			Int64 f5f8_38 = f5_2 * (Int64)f8_19;
+			Int64 f5f9_76 = f5_2 * (Int64)f9_38;
+			Int64 f6f6_19 = f6 * (Int64)f6_19;
+			Int64 f6f7_38 = f6 * (Int64)f7_38;
+			Int64 f6f8_38 = f6_2 * (Int64)f8_19;
+			Int64 f6f9_38 = f6 * (Int64)f9_38;
+			Int64 f7f7_38 = f7 * (Int64)f7_38;
+			Int64 f7f8_38 = f7_2 * (Int64)f8_19;
+			Int64 f7f9_76 = f7_2 * (Int64)f9_38;
+			Int64 f8f8_19 = f8 * (Int64)f8_19;
+			Int64 f8f9_38 = f8 * (Int64)f9_38;
+			Int64 f9f9_38 = f9 * (Int64)f9_38;
+			Int64 h0 = f0f0 + f1f9_76 + f2f8_38 + f3f7_76 + f4f6_38 + f5f5_38;
+			Int64 h1 = f0f1_2 + f2f9_38 + f3f8_38 + f4f7_38 + f5f6_38;
+			Int64 h2 = f0f2_2 + f1f1_2 + f3f9_76 + f4f8_38 + f5f7_76 + f6f6_19;
+			Int64 h3 = f0f3_2 + f1f2_2 + f4f9_38 + f5f8_38 + f6f7_38;
+			Int64 h4 = f0f4_2 + f1f3_4 + f2f2 + f5f9_76 + f6f8_38 + f7f7_38;
+			Int64 h5 = f0f5_2 + f1f4_2 + f2f3_2 + f6f9_38 + f7f8_38;
+			Int64 h6 = f0f6_2 + f1f5_4 + f2f4_2 + f3f3_2 + f7f9_76 + f8f8_19;
+			Int64 h7 = f0f7_2 + f1f6_2 + f2f5_2 + f3f4_2 + f8f9_38;
+			Int64 h8 = f0f8_2 + f1f7_4 + f2f6_2 + f3f5_4 + f4f4 + f9f9_38;
+			Int64 h9 = f0f9_2 + f1f8_2 + f2f7_2 + f3f6_2 + f4f5_2;
+			Int64 carry0;
+			Int64 carry1;
+			Int64 carry2;
+			Int64 carry3;
+			Int64 carry4;
+			Int64 carry5;
+			Int64 carry6;
+			Int64 carry7;
+			Int64 carry8;
+			Int64 carry9;
+
+			h0 += h0;
+			h1 += h1;
+			h2 += h2;
+			h3 += h3;
+			h4 += h4;
+			h5 += h5;
+			h6 += h6;
+			h7 += h7;
+			h8 += h8;
+			h9 += h9;
+
+			carry0 = (h0 + (Int64)(1 << 25)) >> 26; h1 += carry0; h0 -= carry0 << 26;
+			carry4 = (h4 + (Int64)(1 << 25)) >> 26; h5 += carry4; h4 -= carry4 << 26;
+
+			carry1 = (h1 + (Int64)(1 << 24)) >> 25; h2 += carry1; h1 -= carry1 << 25;
+			carry5 = (h5 + (Int64)(1 << 24)) >> 25; h6 += carry5; h5 -= carry5 << 25;
+
+			carry2 = (h2 + (Int64)(1 << 25)) >> 26; h3 += carry2; h2 -= carry2 << 26;
+			carry6 = (h6 + (Int64)(1 << 25)) >> 26; h7 += carry6; h6 -= carry6 << 26;
+
+			carry3 = (h3 + (Int64)(1 << 24)) >> 25; h4 += carry3; h3 -= carry3 << 25;
+			carry7 = (h7 + (Int64)(1 << 24)) >> 25; h8 += carry7; h7 -= carry7 << 25;
+
+			carry4 = (h4 + (Int64)(1 << 25)) >> 26; h5 += carry4; h4 -= carry4 << 26;
+			carry8 = (h8 + (Int64)(1 << 25)) >> 26; h9 += carry8; h8 -= carry8 << 26;
+
+			carry9 = (h9 + (Int64)(1 << 24)) >> 25; h0 += carry9 * 19; h9 -= carry9 << 25;
+
+			carry0 = (h0 + (Int64)(1 << 25)) >> 26; h1 += carry0; h0 -= carry0 << 26;
+
+			h.x0 = (Int32)h0;
+			h.x1 = (Int32)h1;
+			h.x2 = (Int32)h2;
+			h.x3 = (Int32)h3;
+			h.x4 = (Int32)h4;
+			h.x5 = (Int32)h5;
+			h.x6 = (Int32)h6;
+			h.x7 = (Int32)h7;
+			h.x8 = (Int32)h8;
+			h.x9 = (Int32)h9;
+		}
+	}
+}
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_sub.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_sub.cs
new file mode 100644
index 000000000..4de0e6c67
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_sub.cs
@@ -0,0 +1,63 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+	internal static partial class FieldOperations
+	{
+		/*
+		h = f - g
+		Can overlap h with f or g.
+
+		Preconditions:
+		   |f| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
+		   |g| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
+
+		Postconditions:
+		   |h| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc.
+		*/
+
+		internal static void fe_sub(out FieldElement h, ref FieldElement f, ref FieldElement g)
+		{
+			Int32 f0 = f.x0;
+			Int32 f1 = f.x1;
+			Int32 f2 = f.x2;
+			Int32 f3 = f.x3;
+			Int32 f4 = f.x4;
+			Int32 f5 = f.x5;
+			Int32 f6 = f.x6;
+			Int32 f7 = f.x7;
+			Int32 f8 = f.x8;
+			Int32 f9 = f.x9;
+			Int32 g0 = g.x0;
+			Int32 g1 = g.x1;
+			Int32 g2 = g.x2;
+			Int32 g3 = g.x3;
+			Int32 g4 = g.x4;
+			Int32 g5 = g.x5;
+			Int32 g6 = g.x6;
+			Int32 g7 = g.x7;
+			Int32 g8 = g.x8;
+			Int32 g9 = g.x9;
+			Int32 h0 = f0 - g0;
+			Int32 h1 = f1 - g1;
+			Int32 h2 = f2 - g2;
+			Int32 h3 = f3 - g3;
+			Int32 h4 = f4 - g4;
+			Int32 h5 = f5 - g5;
+			Int32 h6 = f6 - g6;
+			Int32 h7 = f7 - g7;
+			Int32 h8 = f8 - g8;
+			Int32 h9 = f9 - g9;
+			h.x0 = h0;
+			h.x1 = h1;
+			h.x2 = h2;
+			h.x3 = h3;
+			h.x4 = h4;
+			h.x5 = h5;
+			h.x6 = h6;
+			h.x7 = h7;
+			h.x8 = h8;
+			h.x9 = h9;
+		}
+	}
+}
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_tobytes.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_tobytes.cs
new file mode 100644
index 000000000..9a36a8f88
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/fe_tobytes.cs
@@ -0,0 +1,154 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+    internal static partial class FieldOperations
+    {
+        /*
+        Preconditions:
+          |h| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc.
+
+        Write p=2^255-19; q=floor(h/p).
+        Basic claim: q = floor(2^(-255)(h + 19 2^(-25)h9 + 2^(-1))).
+
+        Proof:
+          Have |h|<=p so |q|<=1 so |19^2 2^(-255) q|<1/4.
+          Also have |h-2^230 h9|<2^231 so |19 2^(-255)(h-2^230 h9)|<1/4.
+
+          Write y=2^(-1)-19^2 2^(-255)q-19 2^(-255)(h-2^230 h9).
+          Then 0<y<1.
+
+          Write r=h-pq.
+          Have 0<=r<=p-1=2^255-20.
+          Thus 0<=r+19(2^-255)r<r+19(2^-255)2^255<=2^255-1.
+
+          Write x=r+19(2^-255)r+y.
+          Then 0<x<2^255 so floor(2^(-255)x) = 0 so floor(q+2^(-255)x) = q.
+
+          Have q+2^(-255)x = 2^(-255)(h + 19 2^(-25) h9 + 2^(-1))
+          so floor(2^(-255)(h + 19 2^(-25) h9 + 2^(-1))) = q.
+        */
+        internal static void fe_tobytes(byte[] s, int offset, ref FieldElement h)
+        {
+            FieldElement hr;
+            fe_reduce(out hr, ref h);
+
+            Int32 h0 = hr.x0;
+            Int32 h1 = hr.x1;
+            Int32 h2 = hr.x2;
+            Int32 h3 = hr.x3;
+            Int32 h4 = hr.x4;
+            Int32 h5 = hr.x5;
+            Int32 h6 = hr.x6;
+            Int32 h7 = hr.x7;
+            Int32 h8 = hr.x8;
+            Int32 h9 = hr.x9;
+
+            /*
+            Goal: Output h0+...+2^255 h10-2^255 q, which is between 0 and 2^255-20.
+            Have h0+...+2^230 h9 between 0 and 2^255-1;
+            evidently 2^255 h10-2^255 q = 0.
+            Goal: Output h0+...+2^230 h9.
+            */
+            unchecked
+            {
+                s[offset + 0] = (byte) (h0 >> 0);
+                s[offset + 1] = (byte) (h0 >> 8);
+                s[offset + 2] = (byte) (h0 >> 16);
+                s[offset + 3] = (byte) ((h0 >> 24) | (h1 << 2));
+                s[offset + 4] = (byte) (h1 >> 6);
+                s[offset + 5] = (byte) (h1 >> 14);
+                s[offset + 6] = (byte) ((h1 >> 22) | (h2 << 3));
+                s[offset + 7] = (byte) (h2 >> 5);
+                s[offset + 8] = (byte) (h2 >> 13);
+                s[offset + 9] = (byte) ((h2 >> 21) | (h3 << 5));
+                s[offset + 10] = (byte) (h3 >> 3);
+                s[offset + 11] = (byte) (h3 >> 11);
+                s[offset + 12] = (byte) ((h3 >> 19) | (h4 << 6));
+                s[offset + 13] = (byte) (h4 >> 2);
+                s[offset + 14] = (byte) (h4 >> 10);
+                s[offset + 15] = (byte) (h4 >> 18);
+                s[offset + 16] = (byte) (h5 >> 0);
+                s[offset + 17] = (byte) (h5 >> 8);
+                s[offset + 18] = (byte) (h5 >> 16);
+                s[offset + 19] = (byte) ((h5 >> 24) | (h6 << 1));
+                s[offset + 20] = (byte) (h6 >> 7);
+                s[offset + 21] = (byte) (h6 >> 15);
+                s[offset + 22] = (byte) ((h6 >> 23) | (h7 << 3));
+                s[offset + 23] = (byte) (h7 >> 5);
+                s[offset + 24] = (byte) (h7 >> 13);
+                s[offset + 25] = (byte) ((h7 >> 21) | (h8 << 4));
+                s[offset + 26] = (byte) (h8 >> 4);
+                s[offset + 27] = (byte) (h8 >> 12);
+                s[offset + 28] = (byte) ((h8 >> 20) | (h9 << 6));
+                s[offset + 29] = (byte) (h9 >> 2);
+                s[offset + 30] = (byte) (h9 >> 10);
+                s[offset + 31] = (byte) (h9 >> 18);
+            }
+        }
+
+        internal static void fe_reduce(out FieldElement hr, ref FieldElement h)
+        {
+            Int32 h0 = h.x0;
+            Int32 h1 = h.x1;
+            Int32 h2 = h.x2;
+            Int32 h3 = h.x3;
+            Int32 h4 = h.x4;
+            Int32 h5 = h.x5;
+            Int32 h6 = h.x6;
+            Int32 h7 = h.x7;
+            Int32 h8 = h.x8;
+            Int32 h9 = h.x9;
+            Int32 q;
+            Int32 carry0;
+            Int32 carry1;
+            Int32 carry2;
+            Int32 carry3;
+            Int32 carry4;
+            Int32 carry5;
+            Int32 carry6;
+            Int32 carry7;
+            Int32 carry8;
+            Int32 carry9;
+
+            q = (19 * h9 + (((Int32)1) << 24)) >> 25;
+            q = (h0 + q) >> 26;
+            q = (h1 + q) >> 25;
+            q = (h2 + q) >> 26;
+            q = (h3 + q) >> 25;
+            q = (h4 + q) >> 26;
+            q = (h5 + q) >> 25;
+            q = (h6 + q) >> 26;
+            q = (h7 + q) >> 25;
+            q = (h8 + q) >> 26;
+            q = (h9 + q) >> 25;
+
+            /* Goal: Output h-(2^255-19)q, which is between 0 and 2^255-20. */
+            h0 += 19 * q;
+            /* Goal: Output h-2^255 q, which is between 0 and 2^255-20. */
+
+            carry0 = h0 >> 26; h1 += carry0; h0 -= carry0 << 26;
+            carry1 = h1 >> 25; h2 += carry1; h1 -= carry1 << 25;
+            carry2 = h2 >> 26; h3 += carry2; h2 -= carry2 << 26;
+            carry3 = h3 >> 25; h4 += carry3; h3 -= carry3 << 25;
+            carry4 = h4 >> 26; h5 += carry4; h4 -= carry4 << 26;
+            carry5 = h5 >> 25; h6 += carry5; h5 -= carry5 << 25;
+            carry6 = h6 >> 26; h7 += carry6; h6 -= carry6 << 26;
+            carry7 = h7 >> 25; h8 += carry7; h7 -= carry7 << 25;
+            carry8 = h8 >> 26; h9 += carry8; h8 -= carry8 << 26;
+            carry9 = h9 >> 25; h9 -= carry9 << 25;
+            /* h10 = carry9 */
+
+            hr.x0 = h0;
+            hr.x1 = h1;
+            hr.x2 = h2;
+            hr.x3 = h3;
+            hr.x4 = h4;
+            hr.x5 = h5;
+            hr.x6 = h6;
+            hr.x7 = h7;
+            hr.x8 = h8;
+            hr.x9 = h9;
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_add.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_add.cs
new file mode 100644
index 000000000..f80a8176b
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_add.cs
@@ -0,0 +1,113 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+	internal static partial class GroupOperations
+	{
+		/*
+		r = p + q
+		*/
+
+		internal static void ge_add(out GroupElementP1P1 r, ref GroupElementP3 p, ref GroupElementCached q)
+		{
+			FieldElement t0;
+
+			/* qhasm: enter GroupElementadd */
+
+			/* qhasm: fe X1 */
+
+			/* qhasm: fe Y1 */
+
+			/* qhasm: fe Z1 */
+
+			/* qhasm: fe Z2 */
+
+			/* qhasm: fe T1 */
+
+			/* qhasm: fe ZZ */
+
+			/* qhasm: fe YpX2 */
+
+			/* qhasm: fe YmX2 */
+
+			/* qhasm: fe T2d2 */
+
+			/* qhasm: fe X3 */
+
+			/* qhasm: fe Y3 */
+
+			/* qhasm: fe Z3 */
+
+			/* qhasm: fe T3 */
+
+			/* qhasm: fe YpX1 */
+
+			/* qhasm: fe YmX1 */
+
+			/* qhasm: fe A */
+
+			/* qhasm: fe B */
+
+			/* qhasm: fe C */
+
+			/* qhasm: fe D */
+
+			/* qhasm: YpX1 = Y1+X1 */
+			/* asm 1: fe_add(>YpX1=fe#1,<Y1=fe#12,<X1=fe#11); */
+			/* asm 2: fe_add(>YpX1=r.X,<Y1=p.Y,<X1=p.X); */
+			FieldOperations.fe_add(out r.X, ref p.Y, ref p.X);
+
+			/* qhasm: YmX1 = Y1-X1 */
+			/* asm 1: fe_sub(>YmX1=fe#2,<Y1=fe#12,<X1=fe#11); */
+			/* asm 2: fe_sub(>YmX1=r.Y,<Y1=p.Y,<X1=p.X); */
+			FieldOperations.fe_sub(out r.Y, ref p.Y, ref p.X);
+
+			/* qhasm: A = YpX1*YpX2 */
+			/* asm 1: fe_mul(>A=fe#3,<YpX1=fe#1,<YpX2=fe#15); */
+			/* asm 2: fe_mul(>A=r.Z,<YpX1=r.X,<YpX2=q.YplusX); */
+			FieldOperations.fe_mul(out r.Z, ref r.X, ref q.YplusX);
+
+			/* qhasm: B = YmX1*YmX2 */
+			/* asm 1: fe_mul(>B=fe#2,<YmX1=fe#2,<YmX2=fe#16); */
+			/* asm 2: fe_mul(>B=r.Y,<YmX1=r.Y,<YmX2=q.YminusX); */
+			FieldOperations.fe_mul(out r.Y, ref r.Y, ref q.YminusX);
+
+			/* qhasm: C = T2d2*T1 */
+			/* asm 1: fe_mul(>C=fe#4,<T2d2=fe#18,<T1=fe#14); */
+			/* asm 2: fe_mul(>C=r.T,<T2d2=q.T2d,<T1=p.T); */
+			FieldOperations.fe_mul(out r.T, ref q.T2d, ref p.T);
+
+			/* qhasm: ZZ = Z1*Z2 */
+			/* asm 1: fe_mul(>ZZ=fe#1,<Z1=fe#13,<Z2=fe#17); */
+			/* asm 2: fe_mul(>ZZ=r.X,<Z1=p.Z,<Z2=q.Z); */
+			FieldOperations.fe_mul(out r.X, ref p.Z, ref q.Z);
+
+			/* qhasm: D = 2*ZZ */
+			/* asm 1: fe_add(>D=fe#5,<ZZ=fe#1,<ZZ=fe#1); */
+			/* asm 2: fe_add(>D=t0,<ZZ=r.X,<ZZ=r.X); */
+			FieldOperations.fe_add(out t0, ref r.X, ref r.X);
+
+			/* qhasm: X3 = A-B */
+			/* asm 1: fe_sub(>X3=fe#1,<A=fe#3,<B=fe#2); */
+			/* asm 2: fe_sub(>X3=r.X,<A=r.Z,<B=r.Y); */
+			FieldOperations.fe_sub(out r.X, ref r.Z, ref r.Y);
+
+			/* qhasm: Y3 = A+B */
+			/* asm 1: fe_add(>Y3=fe#2,<A=fe#3,<B=fe#2); */
+			/* asm 2: fe_add(>Y3=r.Y,<A=r.Z,<B=r.Y); */
+			FieldOperations.fe_add(out r.Y, ref r.Z, ref r.Y);
+
+			/* qhasm: Z3 = D+C */
+			/* asm 1: fe_add(>Z3=fe#3,<D=fe#5,<C=fe#4); */
+			/* asm 2: fe_add(>Z3=r.Z,<D=t0,<C=r.T); */
+			FieldOperations.fe_add(out r.Z, ref t0, ref r.T);
+
+			/* qhasm: T3 = D-C */
+			/* asm 1: fe_sub(>T3=fe#4,<D=fe#5,<C=fe#4); */
+			/* asm 2: fe_sub(>T3=r.T,<D=t0,<C=r.T); */
+			FieldOperations.fe_sub(out r.T, ref t0, ref r.T);
+
+			/* qhasm: return */
+		}
+	}
+}
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_double_scalarmult.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_double_scalarmult.cs
new file mode 100644
index 000000000..89b1f9e94
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_double_scalarmult.cs
@@ -0,0 +1,118 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+	internal static partial class GroupOperations
+	{
+		private static void slide(sbyte[] r, byte[] a)
+		{
+			int i;
+			int b;
+			int k;
+
+			for (i = 0; i < 256; ++i)
+				r[i] = (sbyte)(1 & (a[i >> 3] >> (i & 7)));
+
+			for (i = 0; i < 256; ++i)
+				if (r[i] != 0)
+				{
+					for (b = 1; b <= 6 && i + b < 256; ++b)
+					{
+						if (r[i + b] != 0)
+						{
+							if (r[i] + (r[i + b] << b) <= 15)
+							{
+								r[i] += (sbyte)(r[i + b] << b); r[i + b] = 0;
+							}
+							else if (r[i] - (r[i + b] << b) >= -15)
+							{
+								r[i] -= (sbyte)(r[i + b] << b);
+								for (k = i + b; k < 256; ++k)
+								{
+									if (r[k] == 0)
+									{
+										r[k] = 1;
+										break;
+									}
+									r[k] = 0;
+								}
+							}
+							else
+								break;
+						}
+					}
+				}
+
+		}
+
+		/*
+		r = a * A + b * B
+		where a = a[0]+256*a[1]+...+256^31 a[31].
+		and b = b[0]+256*b[1]+...+256^31 b[31].
+		B is the Ed25519 base point (x,4/5) with x positive.
+		*/
+
+		public static void ge_double_scalarmult_vartime(out GroupElementP2 r, byte[] a, ref GroupElementP3 A, byte[] b)
+		{
+			GroupElementPreComp[] Bi = LookupTables.Base2;
+            // todo: Perhaps remove these allocations?
+			sbyte[] aslide = new sbyte[256];
+			sbyte[] bslide = new sbyte[256];
+			GroupElementCached[] Ai = new GroupElementCached[8]; /* A,3A,5A,7A,9A,11A,13A,15A */
+			GroupElementP1P1 t;
+			GroupElementP3 u;
+			GroupElementP3 A2;
+			int i;
+
+			slide(aslide, a);
+			slide(bslide, b);
+
+			ge_p3_to_cached(out Ai[0], ref A);
+			ge_p3_dbl(out t, ref A); ge_p1p1_to_p3(out A2, ref t);
+			ge_add(out t, ref A2, ref Ai[0]); ge_p1p1_to_p3(out u, ref t); ge_p3_to_cached(out Ai[1], ref u);
+			ge_add(out t, ref A2, ref Ai[1]); ge_p1p1_to_p3(out u, ref t); ge_p3_to_cached(out Ai[2], ref u);
+			ge_add(out t, ref A2, ref Ai[2]); ge_p1p1_to_p3(out u, ref t); ge_p3_to_cached(out Ai[3], ref u);
+			ge_add(out t, ref A2, ref Ai[3]); ge_p1p1_to_p3(out u, ref t); ge_p3_to_cached(out Ai[4], ref u);
+			ge_add(out t, ref A2, ref Ai[4]); ge_p1p1_to_p3(out u, ref t); ge_p3_to_cached(out Ai[5], ref u);
+			ge_add(out t, ref A2, ref Ai[5]); ge_p1p1_to_p3(out u, ref t); ge_p3_to_cached(out Ai[6], ref u);
+			ge_add(out t, ref A2, ref Ai[6]); ge_p1p1_to_p3(out u, ref t); ge_p3_to_cached(out Ai[7], ref u);
+
+			ge_p2_0(out r);
+
+			for (i = 255; i >= 0; --i)
+			{
+				if ((aslide[i] != 0) || (bslide[i] != 0)) break;
+			}
+
+			for (; i >= 0; --i)
+			{
+				ge_p2_dbl(out t, ref r);
+
+				if (aslide[i] > 0)
+				{
+					ge_p1p1_to_p3(out u, ref t);
+					ge_add(out t, ref u, ref Ai[aslide[i] / 2]);
+				}
+				else if (aslide[i] < 0)
+				{
+					ge_p1p1_to_p3(out u, ref t);
+					ge_sub(out t, ref u, ref Ai[(-aslide[i]) / 2]);
+				}
+
+				if (bslide[i] > 0)
+				{
+					ge_p1p1_to_p3(out u, ref t);
+					ge_madd(out t, ref u, ref Bi[bslide[i] / 2]);
+				}
+				else if (bslide[i] < 0)
+				{
+					ge_p1p1_to_p3(out u, ref t);
+					ge_msub(out t, ref u, ref Bi[(-bslide[i]) / 2]);
+				}
+
+				ge_p1p1_to_p2(out r, ref t);
+			}
+		}
+
+	}
+}
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_frombytes.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_frombytes.cs
new file mode 100644
index 000000000..6ec8dc494
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_frombytes.cs
@@ -0,0 +1,54 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+	internal static partial class GroupOperations
+	{
+		public static int ge_frombytes_negate_vartime(out GroupElementP3 h, byte[] data, int offset)
+		{
+			FieldElement u;
+			FieldElement v;
+			FieldElement v3;
+			FieldElement vxx;
+			FieldElement check;
+
+			FieldOperations.fe_frombytes(out h.Y, data, offset);
+			FieldOperations.fe_1(out h.Z);
+			FieldOperations.fe_sq(out u, ref  h.Y);
+			FieldOperations.fe_mul(out v, ref  u, ref  LookupTables.d);
+			FieldOperations.fe_sub(out u, ref  u, ref  h.Z);       /* u = y^2-1 */
+			FieldOperations.fe_add(out v, ref  v, ref  h.Z);       /* v = dy^2+1 */
+
+			FieldOperations.fe_sq(out v3, ref  v);
+			FieldOperations.fe_mul(out v3, ref  v3, ref  v);        /* v3 = v^3 */
+			FieldOperations.fe_sq(out h.X, ref  v3);
+			FieldOperations.fe_mul(out h.X, ref  h.X, ref  v);
+			FieldOperations.fe_mul(out h.X, ref  h.X, ref  u);    /* x = uv^7 */
+
+			FieldOperations.fe_pow22523(out h.X, ref  h.X); /* x = (uv^7)^((q-5)/8) */
+			FieldOperations.fe_mul(out h.X, ref  h.X, ref  v3);
+			FieldOperations.fe_mul(out h.X, ref  h.X, ref  u);    /* x = uv^3(uv^7)^((q-5)/8) */
+
+			FieldOperations.fe_sq(out vxx, ref  h.X);
+			FieldOperations.fe_mul(out vxx, ref  vxx, ref  v);
+			FieldOperations.fe_sub(out check, ref  vxx, ref  u);    /* vx^2-u */
+			if (FieldOperations.fe_isnonzero(ref check) != 0)
+			{
+				FieldOperations.fe_add(out check, ref  vxx, ref  u);  /* vx^2+u */
+				if (FieldOperations.fe_isnonzero(ref check) != 0)
+				{
+					h = default(GroupElementP3);
+					return -1;
+				}
+				FieldOperations.fe_mul(out h.X, ref  h.X, ref  LookupTables.sqrtm1);
+			}
+
+			if (FieldOperations.fe_isnegative(ref h.X) == (data[offset + 31] >> 7))
+				FieldOperations.fe_neg(out h.X, ref h.X);
+
+			FieldOperations.fe_mul(out h.T, ref h.X, ref h.Y);
+			return 0;
+		}
+
+	}
+}
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_madd.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_madd.cs
new file mode 100644
index 000000000..de80fa61c
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_madd.cs
@@ -0,0 +1,105 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+	internal static partial class GroupOperations
+	{
+		/*
+		r = p + q
+		*/
+		public static void ge_madd(out GroupElementP1P1 r, ref  GroupElementP3 p, ref GroupElementPreComp q)
+		{
+			FieldElement t0;
+
+			/* qhasm: enter ge_madd */
+
+			/* qhasm: fe X1 */
+
+			/* qhasm: fe Y1 */
+
+			/* qhasm: fe Z1 */
+
+			/* qhasm: fe T1 */
+
+			/* qhasm: fe ypx2 */
+
+			/* qhasm: fe ymx2 */
+
+			/* qhasm: fe xy2d2 */
+
+			/* qhasm: fe X3 */
+
+			/* qhasm: fe Y3 */
+
+			/* qhasm: fe Z3 */
+
+			/* qhasm: fe T3 */
+
+			/* qhasm: fe YpX1 */
+
+			/* qhasm: fe YmX1 */
+
+			/* qhasm: fe A */
+
+			/* qhasm: fe B */
+
+			/* qhasm: fe C */
+
+			/* qhasm: fe D */
+
+			/* qhasm: YpX1 = Y1+X1 */
+			/* asm 1: fe_add(>YpX1=fe#1,<Y1=fe#12,<X1=fe#11); */
+			/* asm 2: fe_add(>YpX1=r.X,<Y1=p.Y,<X1=p.X); */
+			FieldOperations.fe_add(out r.X, ref p.Y, ref p.X);
+
+			/* qhasm: YmX1 = Y1-X1 */
+			/* asm 1: fe_sub(>YmX1=fe#2,<Y1=fe#12,<X1=fe#11); */
+			/* asm 2: fe_sub(>YmX1=r.Y,<Y1=p.Y,<X1=p.X); */
+			FieldOperations.fe_sub(out r.Y, ref p.Y, ref p.X);
+
+			/* qhasm: A = YpX1*ypx2 */
+			/* asm 1: fe_mul(>A=fe#3,<YpX1=fe#1,<ypx2=fe#15); */
+			/* asm 2: fe_mul(>A=r.Z,<YpX1=r.X,<ypx2=q.yplusx); */
+			FieldOperations.fe_mul(out r.Z, ref r.X, ref q.yplusx);
+
+			/* qhasm: B = YmX1*ymx2 */
+			/* asm 1: fe_mul(>B=fe#2,<YmX1=fe#2,<ymx2=fe#16); */
+			/* asm 2: fe_mul(>B=r.Y,<YmX1=r.Y,<ymx2=q.yminusx); */
+			FieldOperations.fe_mul(out r.Y, ref r.Y, ref q.yminusx);
+
+			/* qhasm: C = xy2d2*T1 */
+			/* asm 1: fe_mul(>C=fe#4,<xy2d2=fe#17,<T1=fe#14); */
+			/* asm 2: fe_mul(>C=r.T,<xy2d2=q.xy2d,<T1=p.T); */
+			FieldOperations.fe_mul(out r.T, ref q.xy2d, ref p.T);
+
+			/* qhasm: D = 2*Z1 */
+			/* asm 1: fe_add(>D=fe#5,<Z1=fe#13,<Z1=fe#13); */
+			/* asm 2: fe_add(>D=t0,<Z1=p.Z,<Z1=p.Z); */
+			FieldOperations.fe_add(out t0, ref p.Z, ref p.Z);
+
+			/* qhasm: X3 = A-B */
+			/* asm 1: fe_sub(>X3=fe#1,<A=fe#3,<B=fe#2); */
+			/* asm 2: fe_sub(>X3=r.X,<A=r.Z,<B=r.Y); */
+			FieldOperations.fe_sub(out r.X, ref r.Z, ref r.Y);
+
+			/* qhasm: Y3 = A+B */
+			/* asm 1: fe_add(>Y3=fe#2,<A=fe#3,<B=fe#2); */
+			/* asm 2: fe_add(>Y3=r.Y,<A=r.Z,<B=r.Y); */
+			FieldOperations.fe_add(out r.Y, ref r.Z, ref r.Y);
+
+			/* qhasm: Z3 = D+C */
+			/* asm 1: fe_add(>Z3=fe#3,<D=fe#5,<C=fe#4); */
+			/* asm 2: fe_add(>Z3=r.Z,<D=t0,<C=r.T); */
+			FieldOperations.fe_add(out r.Z, ref t0, ref r.T);
+
+			/* qhasm: T3 = D-C */
+			/* asm 1: fe_sub(>T3=fe#4,<D=fe#5,<C=fe#4); */
+			/* asm 2: fe_sub(>T3=r.T,<D=t0,<C=r.T); */
+			FieldOperations.fe_sub(out r.T, ref t0, ref r.T);
+
+			/* qhasm: return */
+
+		}
+
+	}
+}
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_msub.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_msub.cs
new file mode 100644
index 000000000..686b91dba
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_msub.cs
@@ -0,0 +1,104 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+	internal static partial class GroupOperations
+	{
+		/*
+		r = p - q
+		*/
+		public static void ge_msub(out GroupElementP1P1 r, ref  GroupElementP3 p, ref  GroupElementPreComp q)
+		{
+			FieldElement t0;
+
+			/* qhasm: enter ge_msub */
+
+			/* qhasm: fe X1 */
+
+			/* qhasm: fe Y1 */
+
+			/* qhasm: fe Z1 */
+
+			/* qhasm: fe T1 */
+
+			/* qhasm: fe ypx2 */
+
+			/* qhasm: fe ymx2 */
+
+			/* qhasm: fe xy2d2 */
+
+			/* qhasm: fe X3 */
+
+			/* qhasm: fe Y3 */
+
+			/* qhasm: fe Z3 */
+
+			/* qhasm: fe T3 */
+
+			/* qhasm: fe YpX1 */
+
+			/* qhasm: fe YmX1 */
+
+			/* qhasm: fe A */
+
+			/* qhasm: fe B */
+
+			/* qhasm: fe C */
+
+			/* qhasm: fe D */
+
+			/* qhasm: YpX1 = Y1+X1 */
+			/* asm 1: fe_add(>YpX1=fe#1,<Y1=fe#12,<X1=fe#11); */
+			/* asm 2: fe_add(>YpX1=r.X,<Y1=p.Y,<X1=p.X); */
+			FieldOperations.fe_add(out r.X, ref p.Y, ref p.X);
+
+			/* qhasm: YmX1 = Y1-X1 */
+			/* asm 1: fe_sub(>YmX1=fe#2,<Y1=fe#12,<X1=fe#11); */
+			/* asm 2: fe_sub(>YmX1=r.Y,<Y1=p.Y,<X1=p.X); */
+			FieldOperations.fe_sub(out r.Y, ref p.Y, ref p.X);
+
+			/* qhasm: A = YpX1*ymx2 */
+			/* asm 1: fe_mul(>A=fe#3,<YpX1=fe#1,<ymx2=fe#16); */
+			/* asm 2: fe_mul(>A=r.Z,<YpX1=r.X,<ymx2=q.yminusx); */
+			FieldOperations.fe_mul(out r.Z, ref r.X, ref q.yminusx);
+
+			/* qhasm: B = YmX1*ypx2 */
+			/* asm 1: fe_mul(>B=fe#2,<YmX1=fe#2,<ypx2=fe#15); */
+			/* asm 2: fe_mul(>B=r.Y,<YmX1=r.Y,<ypx2=q.yplusx); */
+			FieldOperations.fe_mul(out r.Y, ref r.Y, ref q.yplusx);
+
+			/* qhasm: C = xy2d2*T1 */
+			/* asm 1: fe_mul(>C=fe#4,<xy2d2=fe#17,<T1=fe#14); */
+			/* asm 2: fe_mul(>C=r.T,<xy2d2=q.xy2d,<T1=p.T); */
+			FieldOperations.fe_mul(out r.T, ref q.xy2d, ref p.T);
+
+			/* qhasm: D = 2*Z1 */
+			/* asm 1: fe_add(>D=fe#5,<Z1=fe#13,<Z1=fe#13); */
+			/* asm 2: fe_add(>D=t0,<Z1=p.Z,<Z1=p.Z); */
+			FieldOperations.fe_add(out t0, ref p.Z, ref p.Z);
+
+			/* qhasm: X3 = A-B */
+			/* asm 1: fe_sub(>X3=fe#1,<A=fe#3,<B=fe#2); */
+			/* asm 2: fe_sub(>X3=r.X,<A=r.Z,<B=r.Y); */
+			FieldOperations.fe_sub(out r.X, ref r.Z, ref r.Y);
+
+			/* qhasm: Y3 = A+B */
+			/* asm 1: fe_add(>Y3=fe#2,<A=fe#3,<B=fe#2); */
+			/* asm 2: fe_add(>Y3=r.Y,<A=r.Z,<B=r.Y); */
+			FieldOperations.fe_add(out r.Y, ref r.Z, ref r.Y);
+
+			/* qhasm: Z3 = D-C */
+			/* asm 1: fe_sub(>Z3=fe#3,<D=fe#5,<C=fe#4); */
+			/* asm 2: fe_sub(>Z3=r.Z,<D=t0,<C=r.T); */
+			FieldOperations.fe_sub(out r.Z, ref t0, ref r.T);
+
+			/* qhasm: T3 = D+C */
+			/* asm 1: fe_add(>T3=fe#4,<D=fe#5,<C=fe#4); */
+			/* asm 2: fe_add(>T3=r.T,<D=t0,<C=r.T); */
+			FieldOperations.fe_add(out r.T, ref t0, ref r.T);
+
+			/* qhasm: return */
+
+		}
+	}
+}
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_p1p1_to_p2.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_p1p1_to_p2.cs
new file mode 100644
index 000000000..37a8145d3
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_p1p1_to_p2.cs
@@ -0,0 +1,18 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+	internal static partial class GroupOperations
+	{
+		/*
+		r = p
+		*/
+		public static void ge_p1p1_to_p2(out GroupElementP2 r, ref GroupElementP1P1 p)
+		{
+			FieldOperations.fe_mul(out r.X, ref p.X, ref p.T);
+			FieldOperations.fe_mul(out r.Y, ref p.Y, ref p.Z);
+			FieldOperations.fe_mul(out r.Z, ref p.Z, ref p.T);
+		}
+
+	}
+}
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_p1p1_to_p3.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_p1p1_to_p3.cs
new file mode 100644
index 000000000..bfd5f17c3
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_p1p1_to_p3.cs
@@ -0,0 +1,18 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+	internal static partial class GroupOperations
+	{
+		/*
+		r = p
+		*/
+		public static void ge_p1p1_to_p3(out GroupElementP3 r, ref  GroupElementP1P1 p)
+		{
+			FieldOperations.fe_mul(out r.X, ref p.X, ref p.T);
+			FieldOperations.fe_mul(out r.Y, ref p.Y, ref p.Z);
+			FieldOperations.fe_mul(out r.Z, ref p.Z, ref p.T);
+			FieldOperations.fe_mul(out r.T, ref p.X, ref p.Y);
+		}
+	}
+}
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_p2_0.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_p2_0.cs
new file mode 100644
index 000000000..9fe4a3452
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_p2_0.cs
@@ -0,0 +1,14 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+	internal static partial class GroupOperations
+	{
+		public static void ge_p2_0(out  GroupElementP2 h)
+		{
+			FieldOperations.fe_0(out h.X);
+			FieldOperations.fe_1(out h.Y);
+			FieldOperations.fe_1(out h.Z);
+		}
+	}
+}
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_p2_dbl.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_p2_dbl.cs
new file mode 100644
index 000000000..dcef23d88
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_p2_dbl.cs
@@ -0,0 +1,90 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+	internal static partial class GroupOperations
+	{
+		/*
+		r = 2 * p
+		*/
+
+		public static void ge_p2_dbl(out GroupElementP1P1 r, ref GroupElementP2 p)
+		{
+			FieldElement t0;
+
+			/* qhasm: enter ge_p2_dbl */
+
+			/* qhasm: fe X1 */
+
+			/* qhasm: fe Y1 */
+
+			/* qhasm: fe Z1 */
+
+			/* qhasm: fe A */
+
+			/* qhasm: fe AA */
+
+			/* qhasm: fe XX */
+
+			/* qhasm: fe YY */
+
+			/* qhasm: fe B */
+
+			/* qhasm: fe X3 */
+
+			/* qhasm: fe Y3 */
+
+			/* qhasm: fe Z3 */
+
+			/* qhasm: fe T3 */
+
+			/* qhasm: XX=X1^2 */
+			/* asm 1: fe_sq(>XX=fe#1,<X1=fe#11); */
+			/* asm 2: fe_sq(>XX=r.X,<X1=p.X); */
+			FieldOperations.fe_sq(out r.X, ref p.X);
+
+			/* qhasm: YY=Y1^2 */
+			/* asm 1: fe_sq(>YY=fe#3,<Y1=fe#12); */
+			/* asm 2: fe_sq(>YY=r.Z,<Y1=p.Y); */
+			FieldOperations.fe_sq(out r.Z, ref p.Y);
+
+			/* qhasm: B=2*Z1^2 */
+			/* asm 1: fe_sq2(>B=fe#4,<Z1=fe#13); */
+			/* asm 2: fe_sq2(>B=r.T,<Z1=p.Z); */
+			FieldOperations.fe_sq2(out r.T, ref p.Z);
+
+			/* qhasm: A=X1+Y1 */
+			/* asm 1: fe_add(>A=fe#2,<X1=fe#11,<Y1=fe#12); */
+			/* asm 2: fe_add(>A=r.Y,<X1=p.X,<Y1=p.Y); */
+			FieldOperations.fe_add(out r.Y, ref p.X, ref p.Y);
+
+			/* qhasm: AA=A^2 */
+			/* asm 1: fe_sq(>AA=fe#5,<A=fe#2); */
+			/* asm 2: fe_sq(>AA=t0,<A=r.Y); */
+			FieldOperations.fe_sq(out t0, ref r.Y);
+
+			/* qhasm: Y3=YY+XX */
+			/* asm 1: fe_add(>Y3=fe#2,<YY=fe#3,<XX=fe#1); */
+			/* asm 2: fe_add(>Y3=r.Y,<YY=r.Z,<XX=r.X); */
+			FieldOperations.fe_add(out r.Y, ref r.Z, ref r.X);
+
+			/* qhasm: Z3=YY-XX */
+			/* asm 1: fe_sub(>Z3=fe#3,<YY=fe#3,<XX=fe#1); */
+			/* asm 2: fe_sub(>Z3=r.Z,<YY=r.Z,<XX=r.X); */
+			FieldOperations.fe_sub(out r.Z, ref r.Z, ref r.X);
+
+			/* qhasm: X3=AA-Y3 */
+			/* asm 1: fe_sub(>X3=fe#1,<AA=fe#5,<Y3=fe#2); */
+			/* asm 2: fe_sub(>X3=r.X,<AA=t0,<Y3=r.Y); */
+			FieldOperations.fe_sub(out r.X, ref t0, ref r.Y);
+
+			/* qhasm: T3=B-Z3 */
+			/* asm 1: fe_sub(>T3=fe#4,<B=fe#4,<Z3=fe#3); */
+			/* asm 2: fe_sub(>T3=r.T,<B=r.T,<Z3=r.Z); */
+			FieldOperations.fe_sub(out r.T, ref r.T, ref r.Z);
+
+			/* qhasm: return */
+
+		}
+	}
+}
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_p3_0.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_p3_0.cs
new file mode 100644
index 000000000..204bcbd7c
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_p3_0.cs
@@ -0,0 +1,15 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+	internal static partial class GroupOperations
+	{
+		public static void ge_p3_0(out GroupElementP3 h)
+		{
+			FieldOperations.fe_0(out h.X);
+			FieldOperations.fe_1(out h.Y);
+			FieldOperations.fe_1(out h.Z);
+			FieldOperations.fe_0(out  h.T);
+		}
+	}
+}
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_p3_dbl.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_p3_dbl.cs
new file mode 100644
index 000000000..501a2dfb0
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_p3_dbl.cs
@@ -0,0 +1,17 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+	internal static partial class GroupOperations
+	{
+		/*
+		r = 2 * p
+		*/
+		public static void ge_p3_dbl(out GroupElementP1P1 r, ref GroupElementP3 p)
+		{
+			GroupElementP2 q;
+			ge_p3_to_p2(out q, ref p);
+			ge_p2_dbl(out r, ref q);
+		}
+	}
+}
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_p3_to_cached.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_p3_to_cached.cs
new file mode 100644
index 000000000..3620f2f53
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_p3_to_cached.cs
@@ -0,0 +1,18 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+	internal static partial class GroupOperations
+	{
+		/*
+		r = p
+		*/
+		public static void ge_p3_to_cached(out GroupElementCached r, ref GroupElementP3 p)
+		{
+			FieldOperations.fe_add(out r.YplusX, ref p.Y, ref p.X);
+			FieldOperations.fe_sub(out r.YminusX, ref p.Y, ref p.X);
+			r.Z = p.Z;
+			FieldOperations.fe_mul(out r.T2d, ref p.T, ref LookupTables.d2);
+		}
+	}
+}
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_p3_to_p2.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_p3_to_p2.cs
new file mode 100644
index 000000000..8c256def4
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_p3_to_p2.cs
@@ -0,0 +1,17 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+	internal static partial class GroupOperations
+	{
+		/*
+		r = p
+		*/
+		public static void ge_p3_to_p2(out GroupElementP2 r, ref GroupElementP3 p)
+		{
+			r.X = p.X;
+			r.Y = p.Y;
+			r.Z = p.Z;
+		}
+	}
+}
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_p3_tobytes.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_p3_tobytes.cs
new file mode 100644
index 000000000..9599ab04c
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_p3_tobytes.cs
@@ -0,0 +1,20 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+	internal static partial class GroupOperations
+	{
+		public static void ge_p3_tobytes(byte[] s, int offset, ref GroupElementP3 h)
+		{
+			FieldElement recip;
+			FieldElement x;
+			FieldElement y;
+
+			FieldOperations.fe_invert(out recip, ref h.Z);
+			FieldOperations.fe_mul(out x, ref h.X, ref  recip);
+			FieldOperations.fe_mul(out y, ref  h.Y, ref  recip);
+			FieldOperations.fe_tobytes(s, offset, ref y);
+			s[offset + 31] ^= (byte)(FieldOperations.fe_isnegative(ref x) << 7);
+		}
+	}
+}
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_precomp_0.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_precomp_0.cs
new file mode 100644
index 000000000..f903edf5b
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_precomp_0.cs
@@ -0,0 +1,14 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+	internal static partial class GroupOperations
+	{
+		public static void ge_precomp_0(out GroupElementPreComp h)
+		{
+			FieldOperations.fe_1(out h.yplusx);
+			FieldOperations.fe_1(out h.yminusx);
+			FieldOperations.fe_0(out h.xy2d);
+		}
+	}
+}
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_scalarmult_base.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_scalarmult_base.cs
new file mode 100644
index 000000000..7683bf639
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_scalarmult_base.cs
@@ -0,0 +1,113 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+    internal static partial class GroupOperations
+    {
+        static byte equal(byte b, byte c)
+        {
+
+            byte ub = b;
+            byte uc = c;
+            byte x = (byte)(ub ^ uc); /* 0: yes; 1..255: no */
+            UInt32 y = x; /* 0: yes; 1..255: no */
+            unchecked { y -= 1; } /* 4294967295: yes; 0..254: no */
+            y >>= 31; /* 1: yes; 0: no */
+            return (byte)y;
+        }
+
+        static byte negative(sbyte b)
+        {
+            ulong x = unchecked((ulong)(long)b); /* 18446744073709551361..18446744073709551615: yes; 0..255: no */
+            x >>= 63; /* 1: yes; 0: no */
+            return (byte)x;
+        }
+
+        static void cmov(ref GroupElementPreComp t, ref GroupElementPreComp u, byte b)
+        {
+            FieldOperations.fe_cmov(ref t.yplusx, ref u.yplusx, b);
+            FieldOperations.fe_cmov(ref t.yminusx, ref u.yminusx, b);
+            FieldOperations.fe_cmov(ref t.xy2d, ref u.xy2d, b);
+        }
+
+        static void select(out GroupElementPreComp t, int pos, sbyte b)
+        {
+            GroupElementPreComp minust;
+            byte bnegative = negative(b);
+            byte babs = (byte)(b - (((-bnegative) & b) << 1));
+
+            ge_precomp_0(out t);
+            var table = LookupTables.Base[pos];
+            cmov(ref t, ref table[0], equal(babs, 1));
+            cmov(ref t, ref table[1], equal(babs, 2));
+            cmov(ref t, ref table[2], equal(babs, 3));
+            cmov(ref t, ref table[3], equal(babs, 4));
+            cmov(ref t, ref table[4], equal(babs, 5));
+            cmov(ref t, ref table[5], equal(babs, 6));
+            cmov(ref t, ref table[6], equal(babs, 7));
+            cmov(ref t, ref table[7], equal(babs, 8));
+            minust.yplusx = t.yminusx;
+            minust.yminusx = t.yplusx;
+            FieldOperations.fe_neg(out minust.xy2d, ref t.xy2d);
+            cmov(ref t, ref minust, bnegative);
+        }
+
+        /*
+        h = a * B
+        where a = a[0]+256*a[1]+...+256^31 a[31]
+        B is the Ed25519 base point (x,4/5) with x positive.
+
+        Preconditions:
+          a[31] <= 127
+        */
+
+        public static void ge_scalarmult_base(out GroupElementP3 h, byte[] a, int offset)
+        {
+            // todo: Perhaps remove this allocation
+            sbyte[] e = new sbyte[64];
+            sbyte carry;
+            GroupElementP1P1 r;
+            GroupElementP2 s;
+            GroupElementPreComp t;
+            int i;
+
+            for (i = 0; i < 32; ++i)
+            {
+                e[2 * i + 0] = (sbyte)((a[offset + i] >> 0) & 15);
+                e[2 * i + 1] = (sbyte)((a[offset + i] >> 4) & 15);
+            }
+            /* each e[i] is between 0 and 15 */
+            /* e[63] is between 0 and 7 */
+
+            carry = 0;
+            for (i = 0; i < 63; ++i)
+            {
+                e[i] += carry;
+                carry = (sbyte)(e[i] + 8);
+                carry >>= 4;
+                e[i] -= (sbyte)(carry << 4);
+            }
+            e[63] += carry;
+            /* each e[i] is between -8 and 8 */
+
+            ge_p3_0(out h);
+            for (i = 1; i < 64; i += 2)
+            {
+                select(out t, i / 2, e[i]);
+                ge_madd(out r, ref h, ref t); ge_p1p1_to_p3(out h, ref r);
+            }
+
+            ge_p3_dbl(out r, ref h); ge_p1p1_to_p2(out s, ref r);
+            ge_p2_dbl(out r, ref s); ge_p1p1_to_p2(out s, ref r);
+            ge_p2_dbl(out r, ref s); ge_p1p1_to_p2(out s, ref r);
+            ge_p2_dbl(out r, ref s); ge_p1p1_to_p3(out h, ref r);
+
+            for (i = 0; i < 64; i += 2)
+            {
+                select(out t, i / 2, e[i]);
+                ge_madd(out r, ref h, ref t); ge_p1p1_to_p3(out h, ref r);
+            }
+        }
+
+    }
+}
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_sub.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_sub.cs
new file mode 100644
index 000000000..0965b53fe
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_sub.cs
@@ -0,0 +1,114 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+	internal static partial class GroupOperations
+	{
+		/*
+		r = p - q
+		*/
+
+		public static void ge_sub(out GroupElementP1P1 r, ref  GroupElementP3 p, ref  GroupElementCached q)
+		{
+			FieldElement t0;
+
+			/* qhasm: enter ge_sub */
+
+			/* qhasm: fe X1 */
+
+			/* qhasm: fe Y1 */
+
+			/* qhasm: fe Z1 */
+
+			/* qhasm: fe Z2 */
+
+			/* qhasm: fe T1 */
+
+			/* qhasm: fe ZZ */
+
+			/* qhasm: fe YpX2 */
+
+			/* qhasm: fe YmX2 */
+
+			/* qhasm: fe T2d2 */
+
+			/* qhasm: fe X3 */
+
+			/* qhasm: fe Y3 */
+
+			/* qhasm: fe Z3 */
+
+			/* qhasm: fe T3 */
+
+			/* qhasm: fe YpX1 */
+
+			/* qhasm: fe YmX1 */
+
+			/* qhasm: fe A */
+
+			/* qhasm: fe B */
+
+			/* qhasm: fe C */
+
+			/* qhasm: fe D */
+
+			/* qhasm: YpX1 = Y1+X1 */
+			/* asm 1: fe_add(>YpX1=fe#1,<Y1=fe#12,<X1=fe#11); */
+			/* asm 2: fe_add(>YpX1=r.X,<Y1=p.Y,<X1=p.X); */
+			FieldOperations.fe_add(out r.X, ref p.Y, ref p.X);
+
+			/* qhasm: YmX1 = Y1-X1 */
+			/* asm 1: fe_sub(>YmX1=fe#2,<Y1=fe#12,<X1=fe#11); */
+			/* asm 2: fe_sub(>YmX1=r.Y,<Y1=p.Y,<X1=p.X); */
+			FieldOperations.fe_sub(out r.Y, ref p.Y, ref p.X);
+
+			/* qhasm: A = YpX1*YmX2 */
+			/* asm 1: fe_mul(>A=fe#3,<YpX1=fe#1,<YmX2=fe#16); */
+			/* asm 2: fe_mul(>A=r.Z,<YpX1=r.X,<YmX2=q.YminusX); */
+			FieldOperations.fe_mul(out r.Z, ref r.X, ref q.YminusX);
+
+			/* qhasm: B = YmX1*YpX2 */
+			/* asm 1: fe_mul(>B=fe#2,<YmX1=fe#2,<YpX2=fe#15); */
+			/* asm 2: fe_mul(>B=r.Y,<YmX1=r.Y,<YpX2=q.YplusX); */
+			FieldOperations.fe_mul(out r.Y, ref r.Y, ref q.YplusX);
+
+			/* qhasm: C = T2d2*T1 */
+			/* asm 1: fe_mul(>C=fe#4,<T2d2=fe#18,<T1=fe#14); */
+			/* asm 2: fe_mul(>C=r.T,<T2d2=q.T2d,<T1=p.T); */
+			FieldOperations.fe_mul(out r.T, ref q.T2d, ref p.T);
+
+			/* qhasm: ZZ = Z1*Z2 */
+			/* asm 1: fe_mul(>ZZ=fe#1,<Z1=fe#13,<Z2=fe#17); */
+			/* asm 2: fe_mul(>ZZ=r.X,<Z1=p.Z,<Z2=q.Z); */
+			FieldOperations.fe_mul(out r.X, ref p.Z, ref q.Z);
+
+			/* qhasm: D = 2*ZZ */
+			/* asm 1: fe_add(>D=fe#5,<ZZ=fe#1,<ZZ=fe#1); */
+			/* asm 2: fe_add(>D=t0,<ZZ=r.X,<ZZ=r.X); */
+			FieldOperations.fe_add(out t0, ref r.X, ref r.X);
+
+			/* qhasm: X3 = A-B */
+			/* asm 1: fe_sub(>X3=fe#1,<A=fe#3,<B=fe#2); */
+			/* asm 2: fe_sub(>X3=r.X,<A=r.Z,<B=r.Y); */
+			FieldOperations.fe_sub(out r.X, ref r.Z, ref r.Y);
+
+			/* qhasm: Y3 = A+B */
+			/* asm 1: fe_add(>Y3=fe#2,<A=fe#3,<B=fe#2); */
+			/* asm 2: fe_add(>Y3=r.Y,<A=r.Z,<B=r.Y); */
+			FieldOperations.fe_add(out r.Y, ref r.Z, ref r.Y);
+
+			/* qhasm: Z3 = D-C */
+			/* asm 1: fe_sub(>Z3=fe#3,<D=fe#5,<C=fe#4); */
+			/* asm 2: fe_sub(>Z3=r.Z,<D=t0,<C=r.T); */
+			FieldOperations.fe_sub(out r.Z, ref t0, ref r.T);
+
+			/* qhasm: T3 = D+C */
+			/* asm 1: fe_add(>T3=fe#4,<D=fe#5,<C=fe#4); */
+			/* asm 2: fe_add(>T3=r.T,<D=t0,<C=r.T); */
+			FieldOperations.fe_add(out r.T, ref t0, ref r.T);
+
+			/* qhasm: return */
+		}
+
+	}
+}
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_tobytes.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_tobytes.cs
new file mode 100644
index 000000000..595b48b8a
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/ge_tobytes.cs
@@ -0,0 +1,20 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+	internal static partial class GroupOperations
+	{
+		public static void ge_tobytes(byte[] s, int offset, ref  GroupElementP2 h)
+		{
+			FieldElement recip;
+			FieldElement x;
+			FieldElement y;
+
+			FieldOperations.fe_invert(out recip, ref h.Z);
+			FieldOperations.fe_mul(out x, ref h.X, ref recip);
+			FieldOperations.fe_mul(out y, ref h.Y, ref recip);
+			FieldOperations.fe_tobytes(s, offset, ref y);
+			s[offset + 31] ^= (byte)(FieldOperations.fe_isnegative(ref x) << 7);
+		}
+	}
+}
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/keypair.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/keypair.cs
new file mode 100644
index 000000000..bbccc1a1c
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/keypair.cs
@@ -0,0 +1,23 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+    internal static partial class Ed25519Operations
+    {
+        public static void crypto_sign_keypair(byte[] pk, int pkoffset, byte[] sk, int skoffset, byte[] seed, int seedoffset)
+        {
+            GroupElementP3 A;
+            int i;
+
+            Array.Copy(seed, seedoffset, sk, skoffset, 32);
+            byte[] h = Sha512.Hash(sk, skoffset, 32);//ToDo: Remove alloc
+            ScalarOperations.sc_clamp(h, 0);
+
+            GroupOperations.ge_scalarmult_base(out A, h, 0);
+            GroupOperations.ge_p3_tobytes(pk, pkoffset, ref A);
+
+            for (i = 0; i < 32; ++i) sk[skoffset + 32 + i] = pk[pkoffset + i];
+            CryptoBytes.Wipe(h);
+        }
+    }
+}
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/open.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/open.cs
new file mode 100644
index 000000000..a720639cf
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/open.cs
@@ -0,0 +1,80 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+    internal static partial class Ed25519Operations
+    {
+        // Original crypto_sign_open, for reference only
+        /*public static int crypto_sign_open(
+          byte[] m, out int mlen,
+          byte[] sm, int smlen,
+          byte[] pk)
+        {
+            byte[] h = new byte[64];
+            byte[] checkr = new byte[32];
+            GroupElementP3 A;
+            GroupElementP2 R;
+            int i;
+
+            mlen = -1;
+            if (smlen < 64) return -1;
+            if ((sm[63] & 224) != 0) return -1;
+            if (GroupOperations.ge_frombytes_negate_vartime(out A, pk, 0) != 0) return -1;
+
+            for (i = 0; i < smlen; ++i) m[i] = sm[i];
+            for (i = 0; i < 32; ++i) m[32 + i] = pk[i];
+            Sha512BclWrapper.crypto_hash_sha512(h, m, 0, smlen);
+            ScalarOperations.sc_reduce(h);
+
+            var sm32 = new byte[32];
+            Array.Copy(sm, 32, sm32, 0, 32);
+            GroupOperations.ge_double_scalarmult_vartime(out R, h, ref A, sm32);
+            GroupOperations.ge_tobytes(checkr, 0, ref R);
+            if (Helpers.crypto_verify_32(checkr, sm) != 0)
+            {
+                for (i = 0; i < smlen; ++i)
+                    m[i] = 0;
+                return -1;
+            }
+
+            for (i = 0; i < smlen - 64; ++i)
+                m[i] = sm[64 + i];
+            for (i = smlen - 64; i < smlen; ++i)
+                m[i] = 0;
+            mlen = smlen - 64;
+            return 0;
+        }*/
+
+        public static bool crypto_sign_verify(
+            byte[] sig, int sigoffset,
+            byte[] m, int moffset, int mlen,
+            byte[] pk, int pkoffset)
+        {
+            byte[] h;
+            byte[] checkr = new byte[32];
+            GroupElementP3 A;
+            GroupElementP2 R;
+
+            if ((sig[sigoffset + 63] & 224) != 0) return false;
+            if (GroupOperations.ge_frombytes_negate_vartime(out A, pk, pkoffset) != 0)
+                return false;
+
+            var hasher = new Sha512();
+            hasher.Update(sig, sigoffset, 32);
+            hasher.Update(pk, pkoffset, 32);
+            hasher.Update(m, moffset, mlen);
+            h = hasher.Finish();
+
+            ScalarOperations.sc_reduce(h);
+
+            var sm32 = new byte[32];//todo: remove allocation
+            Array.Copy(sig, sigoffset + 32, sm32, 0, 32);
+            GroupOperations.ge_double_scalarmult_vartime(out R, h, ref A, sm32);
+            GroupOperations.ge_tobytes(checkr, 0, ref R);
+            var result = CryptoBytes.ConstantTimeEquals(checkr, 0, sig, sigoffset, 32);
+            CryptoBytes.Wipe(h);
+            CryptoBytes.Wipe(checkr);
+            return result;
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/sc_clamp.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/sc_clamp.cs
new file mode 100644
index 000000000..a274cb446
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/sc_clamp.cs
@@ -0,0 +1,14 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+    internal static partial class ScalarOperations
+    {
+        public static void sc_clamp(byte[] s, int offset)
+        {
+            s[offset + 0] &= 248;
+            s[offset + 31] &= 127;
+            s[offset + 31] |= 64;
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/sc_mul_add.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/sc_mul_add.cs
new file mode 100644
index 000000000..d6af671bb
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/sc_mul_add.cs
@@ -0,0 +1,374 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+    internal static partial class ScalarOperations
+    {
+        static Int64 load_3(byte[] input, int offset)
+        {
+            Int64 result;
+            result = (Int64)input[offset + 0];
+            result |= ((Int64)input[offset + 1]) << 8;
+            result |= ((Int64)input[offset + 2]) << 16;
+            return result;
+        }
+
+        static Int64 load_4(byte[] input, int offset)
+        {
+            Int64 result;
+            result = (Int64)input[offset + 0];
+            result |= ((Int64)input[offset + 1]) << 8;
+            result |= ((Int64)input[offset + 2]) << 16;
+            result |= ((Int64)input[offset + 3]) << 24;
+            return result;
+        }
+
+        /*
+        Input:
+          a[0]+256*a[1]+...+256^31*a[31] = a
+          b[0]+256*b[1]+...+256^31*b[31] = b
+          c[0]+256*c[1]+...+256^31*c[31] = c
+
+        Output:
+          s[0]+256*s[1]+...+256^31*s[31] = (ab+c) mod l
+          where l = 2^252 + 27742317777372353535851937790883648493.
+        */
+
+        public static void sc_muladd(byte[] s, byte[] a, byte[] b, byte[] c)
+        {
+            Int64 a0 = 2097151 & load_3(a, 0);
+            Int64 a1 = 2097151 & (load_4(a, 2) >> 5);
+            Int64 a2 = 2097151 & (load_3(a, 5) >> 2);
+            Int64 a3 = 2097151 & (load_4(a, 7) >> 7);
+            Int64 a4 = 2097151 & (load_4(a, 10) >> 4);
+            Int64 a5 = 2097151 & (load_3(a, 13) >> 1);
+            Int64 a6 = 2097151 & (load_4(a, 15) >> 6);
+            Int64 a7 = 2097151 & (load_3(a, 18) >> 3);
+            Int64 a8 = 2097151 & load_3(a, 21);
+            Int64 a9 = 2097151 & (load_4(a, 23) >> 5);
+            Int64 a10 = 2097151 & (load_3(a, 26) >> 2);
+            Int64 a11 = (load_4(a, 28) >> 7);
+            Int64 b0 = 2097151 & load_3(b, 0);
+            Int64 b1 = 2097151 & (load_4(b, 2) >> 5);
+            Int64 b2 = 2097151 & (load_3(b, 5) >> 2);
+            Int64 b3 = 2097151 & (load_4(b, 7) >> 7);
+            Int64 b4 = 2097151 & (load_4(b, 10) >> 4);
+            Int64 b5 = 2097151 & (load_3(b, 13) >> 1);
+            Int64 b6 = 2097151 & (load_4(b, 15) >> 6);
+            Int64 b7 = 2097151 & (load_3(b, 18) >> 3);
+            Int64 b8 = 2097151 & load_3(b, 21);
+            Int64 b9 = 2097151 & (load_4(b, 23) >> 5);
+            Int64 b10 = 2097151 & (load_3(b, 26) >> 2);
+            Int64 b11 = (load_4(b, 28) >> 7);
+            Int64 c0 = 2097151 & load_3(c, 0);
+            Int64 c1 = 2097151 & (load_4(c, 2) >> 5);
+            Int64 c2 = 2097151 & (load_3(c, 5) >> 2);
+            Int64 c3 = 2097151 & (load_4(c, 7) >> 7);
+            Int64 c4 = 2097151 & (load_4(c, 10) >> 4);
+            Int64 c5 = 2097151 & (load_3(c, 13) >> 1);
+            Int64 c6 = 2097151 & (load_4(c, 15) >> 6);
+            Int64 c7 = 2097151 & (load_3(c, 18) >> 3);
+            Int64 c8 = 2097151 & load_3(c, 21);
+            Int64 c9 = 2097151 & (load_4(c, 23) >> 5);
+            Int64 c10 = 2097151 & (load_3(c, 26) >> 2);
+            Int64 c11 = (load_4(c, 28) >> 7);
+            Int64 s0;
+            Int64 s1;
+            Int64 s2;
+            Int64 s3;
+            Int64 s4;
+            Int64 s5;
+            Int64 s6;
+            Int64 s7;
+            Int64 s8;
+            Int64 s9;
+            Int64 s10;
+            Int64 s11;
+            Int64 s12;
+            Int64 s13;
+            Int64 s14;
+            Int64 s15;
+            Int64 s16;
+            Int64 s17;
+            Int64 s18;
+            Int64 s19;
+            Int64 s20;
+            Int64 s21;
+            Int64 s22;
+            Int64 s23;
+            Int64 carry0;
+            Int64 carry1;
+            Int64 carry2;
+            Int64 carry3;
+            Int64 carry4;
+            Int64 carry5;
+            Int64 carry6;
+            Int64 carry7;
+            Int64 carry8;
+            Int64 carry9;
+            Int64 carry10;
+            Int64 carry11;
+            Int64 carry12;
+            Int64 carry13;
+            Int64 carry14;
+            Int64 carry15;
+            Int64 carry16;
+            Int64 carry17;
+            Int64 carry18;
+            Int64 carry19;
+            Int64 carry20;
+            Int64 carry21;
+            Int64 carry22;
+
+            s0 = c0 + a0 * b0;
+            s1 = c1 + a0 * b1 + a1 * b0;
+            s2 = c2 + a0 * b2 + a1 * b1 + a2 * b0;
+            s3 = c3 + a0 * b3 + a1 * b2 + a2 * b1 + a3 * b0;
+            s4 = c4 + a0 * b4 + a1 * b3 + a2 * b2 + a3 * b1 + a4 * b0;
+            s5 = c5 + a0 * b5 + a1 * b4 + a2 * b3 + a3 * b2 + a4 * b1 + a5 * b0;
+            s6 = c6 + a0 * b6 + a1 * b5 + a2 * b4 + a3 * b3 + a4 * b2 + a5 * b1 + a6 * b0;
+            s7 = c7 + a0 * b7 + a1 * b6 + a2 * b5 + a3 * b4 + a4 * b3 + a5 * b2 + a6 * b1 + a7 * b0;
+            s8 = c8 + a0 * b8 + a1 * b7 + a2 * b6 + a3 * b5 + a4 * b4 + a5 * b3 + a6 * b2 + a7 * b1 + a8 * b0;
+            s9 = c9 + a0 * b9 + a1 * b8 + a2 * b7 + a3 * b6 + a4 * b5 + a5 * b4 + a6 * b3 + a7 * b2 + a8 * b1 + a9 * b0;
+            s10 = c10 + a0 * b10 + a1 * b9 + a2 * b8 + a3 * b7 + a4 * b6 + a5 * b5 + a6 * b4 + a7 * b3 + a8 * b2 + a9 * b1 + a10 * b0;
+            s11 = c11 + a0 * b11 + a1 * b10 + a2 * b9 + a3 * b8 + a4 * b7 + a5 * b6 + a6 * b5 + a7 * b4 + a8 * b3 + a9 * b2 + a10 * b1 + a11 * b0;
+            s12 = a1 * b11 + a2 * b10 + a3 * b9 + a4 * b8 + a5 * b7 + a6 * b6 + a7 * b5 + a8 * b4 + a9 * b3 + a10 * b2 + a11 * b1;
+            s13 = a2 * b11 + a3 * b10 + a4 * b9 + a5 * b8 + a6 * b7 + a7 * b6 + a8 * b5 + a9 * b4 + a10 * b3 + a11 * b2;
+            s14 = a3 * b11 + a4 * b10 + a5 * b9 + a6 * b8 + a7 * b7 + a8 * b6 + a9 * b5 + a10 * b4 + a11 * b3;
+            s15 = a4 * b11 + a5 * b10 + a6 * b9 + a7 * b8 + a8 * b7 + a9 * b6 + a10 * b5 + a11 * b4;
+            s16 = a5 * b11 + a6 * b10 + a7 * b9 + a8 * b8 + a9 * b7 + a10 * b6 + a11 * b5;
+            s17 = a6 * b11 + a7 * b10 + a8 * b9 + a9 * b8 + a10 * b7 + a11 * b6;
+            s18 = a7 * b11 + a8 * b10 + a9 * b9 + a10 * b8 + a11 * b7;
+            s19 = a8 * b11 + a9 * b10 + a10 * b9 + a11 * b8;
+            s20 = a9 * b11 + a10 * b10 + a11 * b9;
+            s21 = a10 * b11 + a11 * b10;
+            s22 = a11 * b11;
+            s23 = 0;
+
+            carry0 = (s0 + (1 << 20)) >> 21; s1 += carry0; s0 -= carry0 << 21;
+            carry2 = (s2 + (1 << 20)) >> 21; s3 += carry2; s2 -= carry2 << 21;
+            carry4 = (s4 + (1 << 20)) >> 21; s5 += carry4; s4 -= carry4 << 21;
+            carry6 = (s6 + (1 << 20)) >> 21; s7 += carry6; s6 -= carry6 << 21;
+            carry8 = (s8 + (1 << 20)) >> 21; s9 += carry8; s8 -= carry8 << 21;
+            carry10 = (s10 + (1 << 20)) >> 21; s11 += carry10; s10 -= carry10 << 21;
+            carry12 = (s12 + (1 << 20)) >> 21; s13 += carry12; s12 -= carry12 << 21;
+            carry14 = (s14 + (1 << 20)) >> 21; s15 += carry14; s14 -= carry14 << 21;
+            carry16 = (s16 + (1 << 20)) >> 21; s17 += carry16; s16 -= carry16 << 21;
+            carry18 = (s18 + (1 << 20)) >> 21; s19 += carry18; s18 -= carry18 << 21;
+            carry20 = (s20 + (1 << 20)) >> 21; s21 += carry20; s20 -= carry20 << 21;
+            carry22 = (s22 + (1 << 20)) >> 21; s23 += carry22; s22 -= carry22 << 21;
+
+            carry1 = (s1 + (1 << 20)) >> 21; s2 += carry1; s1 -= carry1 << 21;
+            carry3 = (s3 + (1 << 20)) >> 21; s4 += carry3; s3 -= carry3 << 21;
+            carry5 = (s5 + (1 << 20)) >> 21; s6 += carry5; s5 -= carry5 << 21;
+            carry7 = (s7 + (1 << 20)) >> 21; s8 += carry7; s7 -= carry7 << 21;
+            carry9 = (s9 + (1 << 20)) >> 21; s10 += carry9; s9 -= carry9 << 21;
+            carry11 = (s11 + (1 << 20)) >> 21; s12 += carry11; s11 -= carry11 << 21;
+            carry13 = (s13 + (1 << 20)) >> 21; s14 += carry13; s13 -= carry13 << 21;
+            carry15 = (s15 + (1 << 20)) >> 21; s16 += carry15; s15 -= carry15 << 21;
+            carry17 = (s17 + (1 << 20)) >> 21; s18 += carry17; s17 -= carry17 << 21;
+            carry19 = (s19 + (1 << 20)) >> 21; s20 += carry19; s19 -= carry19 << 21;
+            carry21 = (s21 + (1 << 20)) >> 21; s22 += carry21; s21 -= carry21 << 21;
+
+            s11 += s23 * 666643;
+            s12 += s23 * 470296;
+            s13 += s23 * 654183;
+            s14 -= s23 * 997805;
+            s15 += s23 * 136657;
+            s16 -= s23 * 683901;
+            s23 = 0;
+
+            s10 += s22 * 666643;
+            s11 += s22 * 470296;
+            s12 += s22 * 654183;
+            s13 -= s22 * 997805;
+            s14 += s22 * 136657;
+            s15 -= s22 * 683901;
+            s22 = 0;
+
+            s9 += s21 * 666643;
+            s10 += s21 * 470296;
+            s11 += s21 * 654183;
+            s12 -= s21 * 997805;
+            s13 += s21 * 136657;
+            s14 -= s21 * 683901;
+            s21 = 0;
+
+            s8 += s20 * 666643;
+            s9 += s20 * 470296;
+            s10 += s20 * 654183;
+            s11 -= s20 * 997805;
+            s12 += s20 * 136657;
+            s13 -= s20 * 683901;
+            s20 = 0;
+
+            s7 += s19 * 666643;
+            s8 += s19 * 470296;
+            s9 += s19 * 654183;
+            s10 -= s19 * 997805;
+            s11 += s19 * 136657;
+            s12 -= s19 * 683901;
+            s19 = 0;
+
+            s6 += s18 * 666643;
+            s7 += s18 * 470296;
+            s8 += s18 * 654183;
+            s9 -= s18 * 997805;
+            s10 += s18 * 136657;
+            s11 -= s18 * 683901;
+            s18 = 0;
+
+            carry6 = (s6 + (1 << 20)) >> 21; s7 += carry6; s6 -= carry6 << 21;
+            carry8 = (s8 + (1 << 20)) >> 21; s9 += carry8; s8 -= carry8 << 21;
+            carry10 = (s10 + (1 << 20)) >> 21; s11 += carry10; s10 -= carry10 << 21;
+            carry12 = (s12 + (1 << 20)) >> 21; s13 += carry12; s12 -= carry12 << 21;
+            carry14 = (s14 + (1 << 20)) >> 21; s15 += carry14; s14 -= carry14 << 21;
+            carry16 = (s16 + (1 << 20)) >> 21; s17 += carry16; s16 -= carry16 << 21;
+
+            carry7 = (s7 + (1 << 20)) >> 21; s8 += carry7; s7 -= carry7 << 21;
+            carry9 = (s9 + (1 << 20)) >> 21; s10 += carry9; s9 -= carry9 << 21;
+            carry11 = (s11 + (1 << 20)) >> 21; s12 += carry11; s11 -= carry11 << 21;
+            carry13 = (s13 + (1 << 20)) >> 21; s14 += carry13; s13 -= carry13 << 21;
+            carry15 = (s15 + (1 << 20)) >> 21; s16 += carry15; s15 -= carry15 << 21;
+
+            s5 += s17 * 666643;
+            s6 += s17 * 470296;
+            s7 += s17 * 654183;
+            s8 -= s17 * 997805;
+            s9 += s17 * 136657;
+            s10 -= s17 * 683901;
+            s17 = 0;
+
+            s4 += s16 * 666643;
+            s5 += s16 * 470296;
+            s6 += s16 * 654183;
+            s7 -= s16 * 997805;
+            s8 += s16 * 136657;
+            s9 -= s16 * 683901;
+            s16 = 0;
+
+            s3 += s15 * 666643;
+            s4 += s15 * 470296;
+            s5 += s15 * 654183;
+            s6 -= s15 * 997805;
+            s7 += s15 * 136657;
+            s8 -= s15 * 683901;
+            s15 = 0;
+
+            s2 += s14 * 666643;
+            s3 += s14 * 470296;
+            s4 += s14 * 654183;
+            s5 -= s14 * 997805;
+            s6 += s14 * 136657;
+            s7 -= s14 * 683901;
+            s14 = 0;
+
+            s1 += s13 * 666643;
+            s2 += s13 * 470296;
+            s3 += s13 * 654183;
+            s4 -= s13 * 997805;
+            s5 += s13 * 136657;
+            s6 -= s13 * 683901;
+            s13 = 0;
+
+            s0 += s12 * 666643;
+            s1 += s12 * 470296;
+            s2 += s12 * 654183;
+            s3 -= s12 * 997805;
+            s4 += s12 * 136657;
+            s5 -= s12 * 683901;
+            s12 = 0;
+
+            carry0 = (s0 + (1 << 20)) >> 21; s1 += carry0; s0 -= carry0 << 21;
+            carry2 = (s2 + (1 << 20)) >> 21; s3 += carry2; s2 -= carry2 << 21;
+            carry4 = (s4 + (1 << 20)) >> 21; s5 += carry4; s4 -= carry4 << 21;
+            carry6 = (s6 + (1 << 20)) >> 21; s7 += carry6; s6 -= carry6 << 21;
+            carry8 = (s8 + (1 << 20)) >> 21; s9 += carry8; s8 -= carry8 << 21;
+            carry10 = (s10 + (1 << 20)) >> 21; s11 += carry10; s10 -= carry10 << 21;
+
+            carry1 = (s1 + (1 << 20)) >> 21; s2 += carry1; s1 -= carry1 << 21;
+            carry3 = (s3 + (1 << 20)) >> 21; s4 += carry3; s3 -= carry3 << 21;
+            carry5 = (s5 + (1 << 20)) >> 21; s6 += carry5; s5 -= carry5 << 21;
+            carry7 = (s7 + (1 << 20)) >> 21; s8 += carry7; s7 -= carry7 << 21;
+            carry9 = (s9 + (1 << 20)) >> 21; s10 += carry9; s9 -= carry9 << 21;
+            carry11 = (s11 + (1 << 20)) >> 21; s12 += carry11; s11 -= carry11 << 21;
+
+            s0 += s12 * 666643;
+            s1 += s12 * 470296;
+            s2 += s12 * 654183;
+            s3 -= s12 * 997805;
+            s4 += s12 * 136657;
+            s5 -= s12 * 683901;
+            s12 = 0;
+
+            carry0 = s0 >> 21; s1 += carry0; s0 -= carry0 << 21;
+            carry1 = s1 >> 21; s2 += carry1; s1 -= carry1 << 21;
+            carry2 = s2 >> 21; s3 += carry2; s2 -= carry2 << 21;
+            carry3 = s3 >> 21; s4 += carry3; s3 -= carry3 << 21;
+            carry4 = s4 >> 21; s5 += carry4; s4 -= carry4 << 21;
+            carry5 = s5 >> 21; s6 += carry5; s5 -= carry5 << 21;
+            carry6 = s6 >> 21; s7 += carry6; s6 -= carry6 << 21;
+            carry7 = s7 >> 21; s8 += carry7; s7 -= carry7 << 21;
+            carry8 = s8 >> 21; s9 += carry8; s8 -= carry8 << 21;
+            carry9 = s9 >> 21; s10 += carry9; s9 -= carry9 << 21;
+            carry10 = s10 >> 21; s11 += carry10; s10 -= carry10 << 21;
+            carry11 = s11 >> 21; s12 += carry11; s11 -= carry11 << 21;
+
+            s0 += s12 * 666643;
+            s1 += s12 * 470296;
+            s2 += s12 * 654183;
+            s3 -= s12 * 997805;
+            s4 += s12 * 136657;
+            s5 -= s12 * 683901;
+            s12 = 0;
+
+            carry0 = s0 >> 21; s1 += carry0; s0 -= carry0 << 21;
+            carry1 = s1 >> 21; s2 += carry1; s1 -= carry1 << 21;
+            carry2 = s2 >> 21; s3 += carry2; s2 -= carry2 << 21;
+            carry3 = s3 >> 21; s4 += carry3; s3 -= carry3 << 21;
+            carry4 = s4 >> 21; s5 += carry4; s4 -= carry4 << 21;
+            carry5 = s5 >> 21; s6 += carry5; s5 -= carry5 << 21;
+            carry6 = s6 >> 21; s7 += carry6; s6 -= carry6 << 21;
+            carry7 = s7 >> 21; s8 += carry7; s7 -= carry7 << 21;
+            carry8 = s8 >> 21; s9 += carry8; s8 -= carry8 << 21;
+            carry9 = s9 >> 21; s10 += carry9; s9 -= carry9 << 21;
+            carry10 = s10 >> 21; s11 += carry10; s10 -= carry10 << 21;
+
+            unchecked
+            {
+                s[0] = (byte)(s0 >> 0);
+                s[1] = (byte)(s0 >> 8);
+                s[2] = (byte)((s0 >> 16) | (s1 << 5));
+                s[3] = (byte)(s1 >> 3);
+                s[4] = (byte)(s1 >> 11);
+                s[5] = (byte)((s1 >> 19) | (s2 << 2));
+                s[6] = (byte)(s2 >> 6);
+                s[7] = (byte)((s2 >> 14) | (s3 << 7));
+                s[8] = (byte)(s3 >> 1);
+                s[9] = (byte)(s3 >> 9);
+                s[10] = (byte)((s3 >> 17) | (s4 << 4));
+                s[11] = (byte)(s4 >> 4);
+                s[12] = (byte)(s4 >> 12);
+                s[13] = (byte)((s4 >> 20) | (s5 << 1));
+                s[14] = (byte)(s5 >> 7);
+                s[15] = (byte)((s5 >> 15) | (s6 << 6));
+                s[16] = (byte)(s6 >> 2);
+                s[17] = (byte)(s6 >> 10);
+                s[18] = (byte)((s6 >> 18) | (s7 << 3));
+                s[19] = (byte)(s7 >> 5);
+                s[20] = (byte)(s7 >> 13);
+                s[21] = (byte)(s8 >> 0);
+                s[22] = (byte)(s8 >> 8);
+                s[23] = (byte)((s8 >> 16) | (s9 << 5));
+                s[24] = (byte)(s9 >> 3);
+                s[25] = (byte)(s9 >> 11);
+                s[26] = (byte)((s9 >> 19) | (s10 << 2));
+                s[27] = (byte)(s10 >> 6);
+                s[28] = (byte)((s10 >> 14) | (s11 << 7));
+                s[29] = (byte)(s11 >> 1);
+                s[30] = (byte)(s11 >> 9);
+                s[31] = (byte)(s11 >> 17);
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/sc_reduce.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/sc_reduce.cs
new file mode 100644
index 000000000..493bf5a40
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/sc_reduce.cs
@@ -0,0 +1,263 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+    internal static partial class ScalarOperations
+    {
+        /*
+        Input:
+          s[0]+256*s[1]+...+256^63*s[63] = s
+
+        Output:
+          s[0]+256*s[1]+...+256^31*s[31] = s mod l
+          where l = 2^252 + 27742317777372353535851937790883648493.
+          Overwrites s in place.
+        */
+
+        public static void sc_reduce(byte[] s)
+        {
+            Int64 s0 = 2097151 & load_3(s, 0);
+            Int64 s1 = 2097151 & (load_4(s, 2) >> 5);
+            Int64 s2 = 2097151 & (load_3(s, 5) >> 2);
+            Int64 s3 = 2097151 & (load_4(s, 7) >> 7);
+            Int64 s4 = 2097151 & (load_4(s, 10) >> 4);
+            Int64 s5 = 2097151 & (load_3(s, 13) >> 1);
+            Int64 s6 = 2097151 & (load_4(s, 15) >> 6);
+            Int64 s7 = 2097151 & (load_3(s, 18) >> 3);
+            Int64 s8 = 2097151 & load_3(s, 21);
+            Int64 s9 = 2097151 & (load_4(s, 23) >> 5);
+            Int64 s10 = 2097151 & (load_3(s, 26) >> 2);
+            Int64 s11 = 2097151 & (load_4(s, 28) >> 7);
+            Int64 s12 = 2097151 & (load_4(s, 31) >> 4);
+            Int64 s13 = 2097151 & (load_3(s, 34) >> 1);
+            Int64 s14 = 2097151 & (load_4(s, 36) >> 6);
+            Int64 s15 = 2097151 & (load_3(s, 39) >> 3);
+            Int64 s16 = 2097151 & load_3(s, 42);
+            Int64 s17 = 2097151 & (load_4(s, 44) >> 5);
+            Int64 s18 = 2097151 & (load_3(s, 47) >> 2);
+            Int64 s19 = 2097151 & (load_4(s, 49) >> 7);
+            Int64 s20 = 2097151 & (load_4(s, 52) >> 4);
+            Int64 s21 = 2097151 & (load_3(s, 55) >> 1);
+            Int64 s22 = 2097151 & (load_4(s, 57) >> 6);
+            Int64 s23 = (load_4(s, 60) >> 3);
+            Int64 carry0;
+            Int64 carry1;
+            Int64 carry2;
+            Int64 carry3;
+            Int64 carry4;
+            Int64 carry5;
+            Int64 carry6;
+            Int64 carry7;
+            Int64 carry8;
+            Int64 carry9;
+            Int64 carry10;
+            Int64 carry11;
+            Int64 carry12;
+            Int64 carry13;
+            Int64 carry14;
+            Int64 carry15;
+            Int64 carry16;
+
+            s11 += s23 * 666643;
+            s12 += s23 * 470296;
+            s13 += s23 * 654183;
+            s14 -= s23 * 997805;
+            s15 += s23 * 136657;
+            s16 -= s23 * 683901;
+            s23 = 0;
+
+            s10 += s22 * 666643;
+            s11 += s22 * 470296;
+            s12 += s22 * 654183;
+            s13 -= s22 * 997805;
+            s14 += s22 * 136657;
+            s15 -= s22 * 683901;
+            s22 = 0;
+
+            s9 += s21 * 666643;
+            s10 += s21 * 470296;
+            s11 += s21 * 654183;
+            s12 -= s21 * 997805;
+            s13 += s21 * 136657;
+            s14 -= s21 * 683901;
+            s21 = 0;
+
+            s8 += s20 * 666643;
+            s9 += s20 * 470296;
+            s10 += s20 * 654183;
+            s11 -= s20 * 997805;
+            s12 += s20 * 136657;
+            s13 -= s20 * 683901;
+            s20 = 0;
+
+            s7 += s19 * 666643;
+            s8 += s19 * 470296;
+            s9 += s19 * 654183;
+            s10 -= s19 * 997805;
+            s11 += s19 * 136657;
+            s12 -= s19 * 683901;
+            s19 = 0;
+
+            s6 += s18 * 666643;
+            s7 += s18 * 470296;
+            s8 += s18 * 654183;
+            s9 -= s18 * 997805;
+            s10 += s18 * 136657;
+            s11 -= s18 * 683901;
+            s18 = 0;
+
+            carry6 = (s6 + (1 << 20)) >> 21; s7 += carry6; s6 -= carry6 << 21;
+            carry8 = (s8 + (1 << 20)) >> 21; s9 += carry8; s8 -= carry8 << 21;
+            carry10 = (s10 + (1 << 20)) >> 21; s11 += carry10; s10 -= carry10 << 21;
+            carry12 = (s12 + (1 << 20)) >> 21; s13 += carry12; s12 -= carry12 << 21;
+            carry14 = (s14 + (1 << 20)) >> 21; s15 += carry14; s14 -= carry14 << 21;
+            carry16 = (s16 + (1 << 20)) >> 21; s17 += carry16; s16 -= carry16 << 21;
+
+            carry7 = (s7 + (1 << 20)) >> 21; s8 += carry7; s7 -= carry7 << 21;
+            carry9 = (s9 + (1 << 20)) >> 21; s10 += carry9; s9 -= carry9 << 21;
+            carry11 = (s11 + (1 << 20)) >> 21; s12 += carry11; s11 -= carry11 << 21;
+            carry13 = (s13 + (1 << 20)) >> 21; s14 += carry13; s13 -= carry13 << 21;
+            carry15 = (s15 + (1 << 20)) >> 21; s16 += carry15; s15 -= carry15 << 21;
+
+            s5 += s17 * 666643;
+            s6 += s17 * 470296;
+            s7 += s17 * 654183;
+            s8 -= s17 * 997805;
+            s9 += s17 * 136657;
+            s10 -= s17 * 683901;
+            s17 = 0;
+
+            s4 += s16 * 666643;
+            s5 += s16 * 470296;
+            s6 += s16 * 654183;
+            s7 -= s16 * 997805;
+            s8 += s16 * 136657;
+            s9 -= s16 * 683901;
+            s16 = 0;
+
+            s3 += s15 * 666643;
+            s4 += s15 * 470296;
+            s5 += s15 * 654183;
+            s6 -= s15 * 997805;
+            s7 += s15 * 136657;
+            s8 -= s15 * 683901;
+            s15 = 0;
+
+            s2 += s14 * 666643;
+            s3 += s14 * 470296;
+            s4 += s14 * 654183;
+            s5 -= s14 * 997805;
+            s6 += s14 * 136657;
+            s7 -= s14 * 683901;
+            s14 = 0;
+
+            s1 += s13 * 666643;
+            s2 += s13 * 470296;
+            s3 += s13 * 654183;
+            s4 -= s13 * 997805;
+            s5 += s13 * 136657;
+            s6 -= s13 * 683901;
+            s13 = 0;
+
+            s0 += s12 * 666643;
+            s1 += s12 * 470296;
+            s2 += s12 * 654183;
+            s3 -= s12 * 997805;
+            s4 += s12 * 136657;
+            s5 -= s12 * 683901;
+            s12 = 0;
+
+            carry0 = (s0 + (1 << 20)) >> 21; s1 += carry0; s0 -= carry0 << 21;
+            carry2 = (s2 + (1 << 20)) >> 21; s3 += carry2; s2 -= carry2 << 21;
+            carry4 = (s4 + (1 << 20)) >> 21; s5 += carry4; s4 -= carry4 << 21;
+            carry6 = (s6 + (1 << 20)) >> 21; s7 += carry6; s6 -= carry6 << 21;
+            carry8 = (s8 + (1 << 20)) >> 21; s9 += carry8; s8 -= carry8 << 21;
+            carry10 = (s10 + (1 << 20)) >> 21; s11 += carry10; s10 -= carry10 << 21;
+
+            carry1 = (s1 + (1 << 20)) >> 21; s2 += carry1; s1 -= carry1 << 21;
+            carry3 = (s3 + (1 << 20)) >> 21; s4 += carry3; s3 -= carry3 << 21;
+            carry5 = (s5 + (1 << 20)) >> 21; s6 += carry5; s5 -= carry5 << 21;
+            carry7 = (s7 + (1 << 20)) >> 21; s8 += carry7; s7 -= carry7 << 21;
+            carry9 = (s9 + (1 << 20)) >> 21; s10 += carry9; s9 -= carry9 << 21;
+            carry11 = (s11 + (1 << 20)) >> 21; s12 += carry11; s11 -= carry11 << 21;
+
+            s0 += s12 * 666643;
+            s1 += s12 * 470296;
+            s2 += s12 * 654183;
+            s3 -= s12 * 997805;
+            s4 += s12 * 136657;
+            s5 -= s12 * 683901;
+            s12 = 0;
+
+            carry0 = s0 >> 21; s1 += carry0; s0 -= carry0 << 21;
+            carry1 = s1 >> 21; s2 += carry1; s1 -= carry1 << 21;
+            carry2 = s2 >> 21; s3 += carry2; s2 -= carry2 << 21;
+            carry3 = s3 >> 21; s4 += carry3; s3 -= carry3 << 21;
+            carry4 = s4 >> 21; s5 += carry4; s4 -= carry4 << 21;
+            carry5 = s5 >> 21; s6 += carry5; s5 -= carry5 << 21;
+            carry6 = s6 >> 21; s7 += carry6; s6 -= carry6 << 21;
+            carry7 = s7 >> 21; s8 += carry7; s7 -= carry7 << 21;
+            carry8 = s8 >> 21; s9 += carry8; s8 -= carry8 << 21;
+            carry9 = s9 >> 21; s10 += carry9; s9 -= carry9 << 21;
+            carry10 = s10 >> 21; s11 += carry10; s10 -= carry10 << 21;
+            carry11 = s11 >> 21; s12 += carry11; s11 -= carry11 << 21;
+
+            s0 += s12 * 666643;
+            s1 += s12 * 470296;
+            s2 += s12 * 654183;
+            s3 -= s12 * 997805;
+            s4 += s12 * 136657;
+            s5 -= s12 * 683901;
+            s12 = 0;
+
+            carry0 = s0 >> 21; s1 += carry0; s0 -= carry0 << 21;
+            carry1 = s1 >> 21; s2 += carry1; s1 -= carry1 << 21;
+            carry2 = s2 >> 21; s3 += carry2; s2 -= carry2 << 21;
+            carry3 = s3 >> 21; s4 += carry3; s3 -= carry3 << 21;
+            carry4 = s4 >> 21; s5 += carry4; s4 -= carry4 << 21;
+            carry5 = s5 >> 21; s6 += carry5; s5 -= carry5 << 21;
+            carry6 = s6 >> 21; s7 += carry6; s6 -= carry6 << 21;
+            carry7 = s7 >> 21; s8 += carry7; s7 -= carry7 << 21;
+            carry8 = s8 >> 21; s9 += carry8; s8 -= carry8 << 21;
+            carry9 = s9 >> 21; s10 += carry9; s9 -= carry9 << 21;
+            carry10 = s10 >> 21; s11 += carry10; s10 -= carry10 << 21;
+
+            unchecked
+            {
+                s[0] = (byte)(s0 >> 0);
+                s[1] = (byte)(s0 >> 8);
+                s[2] = (byte)((s0 >> 16) | (s1 << 5));
+                s[3] = (byte)(s1 >> 3);
+                s[4] = (byte)(s1 >> 11);
+                s[5] = (byte)((s1 >> 19) | (s2 << 2));
+                s[6] = (byte)(s2 >> 6);
+                s[7] = (byte)((s2 >> 14) | (s3 << 7));
+                s[8] = (byte)(s3 >> 1);
+                s[9] = (byte)(s3 >> 9);
+                s[10] = (byte)((s3 >> 17) | (s4 << 4));
+                s[11] = (byte)(s4 >> 4);
+                s[12] = (byte)(s4 >> 12);
+                s[13] = (byte)((s4 >> 20) | (s5 << 1));
+                s[14] = (byte)(s5 >> 7);
+                s[15] = (byte)((s5 >> 15) | (s6 << 6));
+                s[16] = (byte)(s6 >> 2);
+                s[17] = (byte)(s6 >> 10);
+                s[18] = (byte)((s6 >> 18) | (s7 << 3));
+                s[19] = (byte)(s7 >> 5);
+                s[20] = (byte)(s7 >> 13);
+                s[21] = (byte)(s8 >> 0);
+                s[22] = (byte)(s8 >> 8);
+                s[23] = (byte)((s8 >> 16) | (s9 << 5));
+                s[24] = (byte)(s9 >> 3);
+                s[25] = (byte)(s9 >> 11);
+                s[26] = (byte)((s9 >> 19) | (s10 << 2));
+                s[27] = (byte)(s10 >> 6);
+                s[28] = (byte)((s10 >> 14) | (s11 << 7));
+                s[29] = (byte)(s11 >> 1);
+                s[30] = (byte)(s11 >> 9);
+                s[31] = (byte)(s11 >> 17);
+            }
+        }
+
+    }
+}
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/scalarmult.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/scalarmult.cs
new file mode 100644
index 000000000..d2843c7c9
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/scalarmult.cs
@@ -0,0 +1,207 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+#pragma warning disable CS1591 // Fehledes XML-Kommentar für öffentlich sichtbaren Typ oder Element
+    public static class MontgomeryOperations
+    {
+		public static void scalarmult(
+			byte[] q, int qoffset,
+			byte[] n, int noffset,
+			byte[] p, int poffset)
+		{
+			FieldElement p0;
+			FieldElement q0;
+			FieldOperations.fe_frombytes2(out p0, p, poffset);
+			scalarmult(out q0, n, noffset, ref p0);
+			FieldOperations.fe_tobytes(q, qoffset, ref q0);
+		}
+
+		internal static void scalarmult(
+			out FieldElement q,
+			byte[] n, int noffset,
+			ref FieldElement p)
+		{
+			byte[] e = new byte[32];//ToDo: remove allocation
+			UInt32 i;
+			FieldElement x1;
+			FieldElement x2;
+			FieldElement z2;
+			FieldElement x3;
+			FieldElement z3;
+			FieldElement tmp0;
+			FieldElement tmp1;
+			int pos;
+			UInt32 swap;
+			UInt32 b;
+
+			for (i = 0; i < 32; ++i)
+				e[i] = n[noffset + i];
+		    ScalarOperations.sc_clamp(e, 0);
+			x1 = p;
+			FieldOperations.fe_1(out x2);
+			FieldOperations.fe_0(out z2);
+			x3 = x1;
+			FieldOperations.fe_1(out z3);
+
+			swap = 0;
+			for (pos = 254; pos >= 0; --pos)
+			{
+				b = (uint)(e[pos / 8] >> (pos & 7));
+				b &= 1;
+				swap ^= b;
+				FieldOperations.fe_cswap(ref x2, ref x3, swap);
+				FieldOperations.fe_cswap(ref z2, ref z3, swap);
+				swap = b;
+				/* qhasm: fe X2 */
+
+				/* qhasm: fe Z2 */
+
+				/* qhasm: fe X3 */
+
+				/* qhasm: fe Z3 */
+
+				/* qhasm: fe X4 */
+
+				/* qhasm: fe Z4 */
+
+				/* qhasm: fe X5 */
+
+				/* qhasm: fe Z5 */
+
+				/* qhasm: fe A */
+
+				/* qhasm: fe B */
+
+				/* qhasm: fe C */
+
+				/* qhasm: fe D */
+
+				/* qhasm: fe E */
+
+				/* qhasm: fe AA */
+
+				/* qhasm: fe BB */
+
+				/* qhasm: fe DA */
+
+				/* qhasm: fe CB */
+
+				/* qhasm: fe t0 */
+
+				/* qhasm: fe t1 */
+
+				/* qhasm: fe t2 */
+
+				/* qhasm: fe t3 */
+
+				/* qhasm: fe t4 */
+
+				/* qhasm: enter ladder */
+
+				/* qhasm: D = X3-Z3 */
+				/* asm 1: fe_sub(>D=fe#5,<X3=fe#3,<Z3=fe#4); */
+				/* asm 2: fe_sub(>D=tmp0,<X3=x3,<Z3=z3); */
+				FieldOperations.fe_sub(out tmp0, ref  x3, ref  z3);
+
+				/* qhasm: B = X2-Z2 */
+				/* asm 1: fe_sub(>B=fe#6,<X2=fe#1,<Z2=fe#2); */
+				/* asm 2: fe_sub(>B=tmp1,<X2=x2,<Z2=z2); */
+				FieldOperations.fe_sub(out tmp1, ref x2, ref z2);
+
+				/* qhasm: A = X2+Z2 */
+				/* asm 1: fe_add(>A=fe#1,<X2=fe#1,<Z2=fe#2); */
+				/* asm 2: fe_add(>A=x2,<X2=x2,<Z2=z2); */
+				FieldOperations.fe_add(out x2, ref x2, ref z2);
+
+				/* qhasm: C = X3+Z3 */
+				/* asm 1: fe_add(>C=fe#2,<X3=fe#3,<Z3=fe#4); */
+				/* asm 2: fe_add(>C=z2,<X3=x3,<Z3=z3); */
+				FieldOperations.fe_add(out z2, ref  x3, ref z3);
+
+				/* qhasm: DA = D*A */
+				/* asm 1: fe_mul(>DA=fe#4,<D=fe#5,<A=fe#1); */
+				/* asm 2: fe_mul(>DA=z3,<D=tmp0,<A=x2); */
+				FieldOperations.fe_mul(out z3, ref tmp0, ref x2);
+
+				/* qhasm: CB = C*B */
+				/* asm 1: fe_mul(>CB=fe#2,<C=fe#2,<B=fe#6); */
+				/* asm 2: fe_mul(>CB=z2,<C=z2,<B=tmp1); */
+				FieldOperations.fe_mul(out z2, ref  z2, ref tmp1);
+
+				/* qhasm: BB = B^2 */
+				/* asm 1: fe_sq(>BB=fe#5,<B=fe#6); */
+				/* asm 2: fe_sq(>BB=tmp0,<B=tmp1); */
+				FieldOperations.fe_sq(out tmp0, ref  tmp1);
+
+				/* qhasm: AA = A^2 */
+				/* asm 1: fe_sq(>AA=fe#6,<A=fe#1); */
+				/* asm 2: fe_sq(>AA=tmp1,<A=x2); */
+				FieldOperations.fe_sq(out tmp1, ref  x2);
+
+				/* qhasm: t0 = DA+CB */
+				/* asm 1: fe_add(>t0=fe#3,<DA=fe#4,<CB=fe#2); */
+				/* asm 2: fe_add(>t0=x3,<DA=z3,<CB=z2); */
+				FieldOperations.fe_add(out x3, ref z3, ref  z2);
+
+				/* qhasm: assign x3 to t0 */
+
+				/* qhasm: t1 = DA-CB */
+				/* asm 1: fe_sub(>t1=fe#2,<DA=fe#4,<CB=fe#2); */
+				/* asm 2: fe_sub(>t1=z2,<DA=z3,<CB=z2); */
+				FieldOperations.fe_sub(out z2, ref z3, ref  z2);
+
+				/* qhasm: X4 = AA*BB */
+				/* asm 1: fe_mul(>X4=fe#1,<AA=fe#6,<BB=fe#5); */
+				/* asm 2: fe_mul(>X4=x2,<AA=tmp1,<BB=tmp0); */
+				FieldOperations.fe_mul(out x2, ref tmp1, ref  tmp0);
+
+				/* qhasm: E = AA-BB */
+				/* asm 1: fe_sub(>E=fe#6,<AA=fe#6,<BB=fe#5); */
+				/* asm 2: fe_sub(>E=tmp1,<AA=tmp1,<BB=tmp0); */
+				FieldOperations.fe_sub(out tmp1, ref  tmp1, ref tmp0);
+
+				/* qhasm: t2 = t1^2 */
+				/* asm 1: fe_sq(>t2=fe#2,<t1=fe#2); */
+				/* asm 2: fe_sq(>t2=z2,<t1=z2); */
+				FieldOperations.fe_sq(out z2, ref z2);
+
+				/* qhasm: t3 = a24*E */
+				/* asm 1: fe_mul121666(>t3=fe#4,<E=fe#6); */
+				/* asm 2: fe_mul121666(>t3=z3,<E=tmp1); */
+				FieldOperations.fe_mul121666(out z3, ref tmp1);
+
+				/* qhasm: X5 = t0^2 */
+				/* asm 1: fe_sq(>X5=fe#3,<t0=fe#3); */
+				/* asm 2: fe_sq(>X5=x3,<t0=x3); */
+				FieldOperations.fe_sq(out x3, ref  x3);
+
+				/* qhasm: t4 = BB+t3 */
+				/* asm 1: fe_add(>t4=fe#5,<BB=fe#5,<t3=fe#4); */
+				/* asm 2: fe_add(>t4=tmp0,<BB=tmp0,<t3=z3); */
+				FieldOperations.fe_add(out tmp0, ref  tmp0, ref z3);
+
+				/* qhasm: Z5 = X1*t2 */
+				/* asm 1: fe_mul(>Z5=fe#4,x1,<t2=fe#2); */
+				/* asm 2: fe_mul(>Z5=z3,x1,<t2=z2); */
+				FieldOperations.fe_mul(out z3, ref x1, ref  z2);
+
+				/* qhasm: Z4 = E*t4 */
+				/* asm 1: fe_mul(>Z4=fe#2,<E=fe#6,<t4=fe#5); */
+				/* asm 2: fe_mul(>Z4=z2,<E=tmp1,<t4=tmp0); */
+				FieldOperations.fe_mul(out z2, ref  tmp1, ref  tmp0);
+
+				/* qhasm: return */
+
+			}
+			FieldOperations.fe_cswap(ref x2, ref x3, swap);
+			FieldOperations.fe_cswap(ref z2, ref z3, swap);
+
+			FieldOperations.fe_invert(out z2, ref z2);
+			FieldOperations.fe_mul(out x2, ref x2, ref z2);
+			q = x2;
+			CryptoBytes.Wipe(e);
+		}
+	}
+}
+#pragma warning restore CS1591 // Fehledes XML-Kommentar für öffentlich sichtbaren Typ oder Element
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/sign.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/sign.cs
new file mode 100644
index 000000000..3d54c291e
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/sign.cs
@@ -0,0 +1,81 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+	internal static partial class Ed25519Operations
+	{
+		/*public static void crypto_sign(
+		  byte[] sm, out int smlen,
+		   byte[] m, int mlen,
+		   byte[] sk
+		)
+		{
+			byte[] az = new byte[64];
+			byte[] r = new byte[64];
+			byte[] hram = new byte[64];
+			GroupElementP3 R;
+			int i;
+
+			Helpers.crypto_hash_sha512(az, sk, 0, 32);
+			az[0] &= 248;
+			az[31] &= 63;
+			az[31] |= 64;
+
+			smlen = mlen + 64;
+			for (i = 0; i < mlen; ++i) sm[64 + i] = m[i];
+			for (i = 0; i < 32; ++i) sm[32 + i] = az[32 + i];
+			Helpers.crypto_hash_sha512(r, sm, 32, mlen + 32);
+			for (i = 0; i < 32; ++i) sm[32 + i] = sk[32 + i];
+
+			ScalarOperations.sc_reduce(r);
+			GroupOperations.ge_scalarmult_base(out R, r, 0);
+			GroupOperations.ge_p3_tobytes(sm, 0, ref R);
+
+			Helpers.crypto_hash_sha512(hram, sm, 0, mlen + 64);
+			ScalarOperations.sc_reduce(hram);
+			var sm32 = new byte[32];
+			Array.Copy(sm, 32, sm32, 0, 32);
+			ScalarOperations.sc_muladd(sm32, hram, az, r);
+			Array.Copy(sm32, 0, sm, 32, 32);
+		}*/
+
+		public static void crypto_sign2(
+			byte[] sig, int sigoffset,
+			byte[] m, int moffset, int mlen,
+			byte[] sk, int skoffset)
+		{
+			byte[] az;
+			byte[] r;
+			byte[] hram;
+			GroupElementP3 R;
+		    var hasher = new Sha512();
+			{
+                hasher.Update(sk, skoffset, 32);
+			    az = hasher.Finish();
+			    ScalarOperations.sc_clamp(az, 0);
+
+			    hasher.Init();
+				hasher.Update(az, 32, 32);
+				hasher.Update(m, moffset, mlen);
+				r = hasher.Finish();
+
+				ScalarOperations.sc_reduce(r);
+				GroupOperations.ge_scalarmult_base(out R, r, 0);
+				GroupOperations.ge_p3_tobytes(sig, sigoffset, ref R);
+
+				hasher.Init();
+				hasher.Update(sig, sigoffset, 32);
+				hasher.Update(sk, skoffset + 32, 32);
+				hasher.Update(m, moffset, mlen);
+				hram = hasher.Finish();
+
+				ScalarOperations.sc_reduce(hram);
+				var s = new byte[32];//todo: remove allocation
+				Array.Copy(sig, sigoffset + 32, s, 0, 32);
+				ScalarOperations.sc_muladd(s, hram, az, r);
+				Array.Copy(s, 0, sig, sigoffset + 32, 32);
+				CryptoBytes.Wipe(s);
+			}
+		}
+	}
+}
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/sqrtm1.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/sqrtm1.cs
new file mode 100644
index 000000000..fb8b50122
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Ed25519Ref10/sqrtm1.cs
@@ -0,0 +1,9 @@
+using System;
+
+namespace Chaos.NaCl.Internal.Ed25519Ref10
+{
+	internal static partial class LookupTables
+	{
+		internal static FieldElement sqrtm1 = new FieldElement(-32595792, -7943725, 9377950, 3500415, 12389472, -272473, -25146209, -2005654, 326686, 11406482);
+	}
+}
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/InternalAssert.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/InternalAssert.cs
new file mode 100644
index 000000000..43fbfd47f
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/InternalAssert.cs
@@ -0,0 +1,13 @@
+using System;
+
+namespace Chaos.NaCl.Internal
+{
+    internal static class InternalAssert
+    {
+        public static void Assert(bool condition, string message)
+        {
+            if (!condition)
+                throw new InvalidOperationException("An assertion in Chaos.Crypto failed " + message);
+        }
+    }
+}
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/License.txt b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/License.txt
new file mode 100644
index 000000000..fa608d142
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/License.txt
@@ -0,0 +1,23 @@
+Public domain
+
+C# port + code by Christian Winnerlein (CodesInChaos)
+
+Poly1305 in c
+        written by Andrew M. (floodyberry)
+        original license: MIT or PUBLIC DOMAIN
+        https://github.com/floodyberry/poly1305-donna/blob/master/poly1305-donna-unrolled.c
+
+Curve25519 and Ed25519 in c
+        written by Dan Bernstein (djb)
+        public domain
+        from Ref10 in SUPERCOP http://bench.cr.yp.to/supercop.html
+
+(H)Salsa20 in c
+        written by Dan Bernstein (djb)
+        public domain
+        from SUPERCOP http://bench.cr.yp.to/supercop.html
+
+SHA512
+        written by Christian Winnerlein (CodesInChaos)
+        public domain
+        directly from the specification
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/MontgomeryCurve25519.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/MontgomeryCurve25519.cs
new file mode 100644
index 000000000..7eb6614d2
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/MontgomeryCurve25519.cs
@@ -0,0 +1,143 @@
+using System;
+using Chaos.NaCl.Internal;
+using Chaos.NaCl.Internal.Ed25519Ref10;
+using Chaos.NaCl.Internal.Salsa;
+
+#pragma warning disable CS1591 // Fehledes XML-Kommentar für öffentlich sichtbaren Typ oder Element
+namespace Chaos.NaCl
+{
+    // This class is mainly for compatibility with NaCl's Curve25519 implementation
+    // If you don't need that compatibility, use Ed25519.KeyExchange
+    public static class MontgomeryCurve25519
+    {
+        public static readonly int PublicKeySizeInBytes = 32;
+        public static readonly int PrivateKeySizeInBytes = 32;
+        public static readonly int SharedKeySizeInBytes = 32;
+
+        public static byte[] GetPublicKey(byte[] privateKey)
+        {
+            if (privateKey == null)
+                throw new ArgumentNullException("privateKey");
+            if (privateKey.Length != PrivateKeySizeInBytes)
+                throw new ArgumentException("privateKey.Length must be 32");
+            var publicKey = new byte[32];
+            GetPublicKey(new ArraySegment<byte>(publicKey), new ArraySegment<byte>(privateKey));
+            return publicKey;
+        }
+
+        static readonly byte[] _basePoint = new byte[32]
+		{
+			9, 0, 0, 0, 0, 0, 0, 0,
+			0, 0, 0 ,0, 0, 0, 0, 0,
+			0, 0, 0 ,0, 0, 0, 0, 0,
+			0, 0, 0 ,0, 0, 0, 0, 0
+		};
+
+        public static void GetPublicKey(ArraySegment<byte> publicKey, ArraySegment<byte> privateKey)
+        {
+            if (publicKey.Array == null)
+                throw new ArgumentNullException("publicKey.Array");
+            if (privateKey.Array == null)
+                throw new ArgumentNullException("privateKey.Array");
+            if (publicKey.Count != PublicKeySizeInBytes)
+                throw new ArgumentException("privateKey.Count must be 32");
+            if (privateKey.Count != PrivateKeySizeInBytes)
+                throw new ArgumentException("privateKey.Count must be 32");
+
+            // hack: abusing publicKey as temporary storage
+            // todo: remove hack
+            for (int i = 0; i < 32; i++)
+            {
+                publicKey.Array[publicKey.Offset + i] = privateKey.Array[privateKey.Offset + i];
+            }
+            ScalarOperations.sc_clamp(publicKey.Array, publicKey.Offset);
+
+            GroupElementP3 A;
+            GroupOperations.ge_scalarmult_base(out A, publicKey.Array, publicKey.Offset);
+            FieldElement publicKeyFE;
+            EdwardsToMontgomeryX(out publicKeyFE, ref A.Y, ref A.Z);
+            FieldOperations.fe_tobytes(publicKey.Array, publicKey.Offset, ref publicKeyFE);
+        }
+
+        // hashes like the Curve25519 paper says
+        internal static void KeyExchangeOutputHashCurve25519Paper(byte[] sharedKey, int offset)
+        {
+            //c = Curve25519output
+            const UInt32 c0 = 'C' | 'u' << 8 | 'r' << 16 | (UInt32)'v' << 24;
+            const UInt32 c1 = 'e' | '2' << 8 | '5' << 16 | (UInt32)'5' << 24;
+            const UInt32 c2 = '1' | '9' << 8 | 'o' << 16 | (UInt32)'u' << 24;
+            const UInt32 c3 = 't' | 'p' << 8 | 'u' << 16 | (UInt32)'t' << 24;
+
+            Array16<UInt32> salsaState;
+            salsaState.x0 = c0;
+            salsaState.x1 = ByteIntegerConverter.LoadLittleEndian32(sharedKey, offset + 0);
+            salsaState.x2 = 0;
+            salsaState.x3 = ByteIntegerConverter.LoadLittleEndian32(sharedKey, offset + 4);
+            salsaState.x4 = ByteIntegerConverter.LoadLittleEndian32(sharedKey, offset + 8);
+            salsaState.x5 = c1;
+            salsaState.x6 = ByteIntegerConverter.LoadLittleEndian32(sharedKey, offset + 12);
+            salsaState.x7 = 0;
+            salsaState.x8 = 0;
+            salsaState.x9 = ByteIntegerConverter.LoadLittleEndian32(sharedKey, offset + 16);
+            salsaState.x10 = c2;
+            salsaState.x11 = ByteIntegerConverter.LoadLittleEndian32(sharedKey, offset + 20);
+            salsaState.x12 = ByteIntegerConverter.LoadLittleEndian32(sharedKey, offset + 24);
+            salsaState.x13 = 0;
+            salsaState.x14 = ByteIntegerConverter.LoadLittleEndian32(sharedKey, offset + 28);
+            salsaState.x15 = c3;
+            SalsaCore.Salsa(out salsaState, ref salsaState, 20);
+
+            ByteIntegerConverter.StoreLittleEndian32(sharedKey, offset + 0, salsaState.x0);
+            ByteIntegerConverter.StoreLittleEndian32(sharedKey, offset + 4, salsaState.x1);
+            ByteIntegerConverter.StoreLittleEndian32(sharedKey, offset + 8, salsaState.x2);
+            ByteIntegerConverter.StoreLittleEndian32(sharedKey, offset + 12, salsaState.x3);
+            ByteIntegerConverter.StoreLittleEndian32(sharedKey, offset + 16, salsaState.x4);
+            ByteIntegerConverter.StoreLittleEndian32(sharedKey, offset + 20, salsaState.x5);
+            ByteIntegerConverter.StoreLittleEndian32(sharedKey, offset + 24, salsaState.x6);
+            ByteIntegerConverter.StoreLittleEndian32(sharedKey, offset + 28, salsaState.x7);
+        }
+
+        private static readonly byte[] _zero16 = new byte[16];
+
+        // hashes like the NaCl paper says instead i.e. HSalsa(x,0)
+        internal static void KeyExchangeOutputHashNaCl(byte[] sharedKey, int offset)
+        {
+            Salsa20.HSalsa20(sharedKey, offset, sharedKey, offset, _zero16, 0);
+        }
+
+        public static byte[] KeyExchange(byte[] publicKey, byte[] privateKey)
+        {
+            var sharedKey = new byte[SharedKeySizeInBytes];
+            KeyExchange(new ArraySegment<byte>(sharedKey), new ArraySegment<byte>(publicKey), new ArraySegment<byte>(privateKey));
+            return sharedKey;
+        }
+
+        public static void KeyExchange(ArraySegment<byte> sharedKey, ArraySegment<byte> publicKey, ArraySegment<byte> privateKey)
+        {
+            if (sharedKey.Array == null)
+                throw new ArgumentNullException("sharedKey.Array");
+            if (publicKey.Array == null)
+                throw new ArgumentNullException("publicKey.Array");
+            if (privateKey.Array == null)
+                throw new ArgumentNullException("privateKey");
+            if (sharedKey.Count != 32)
+                throw new ArgumentException("sharedKey.Count != 32");
+            if (publicKey.Count != 32)
+                throw new ArgumentException("publicKey.Count != 32");
+            if (privateKey.Count != 32)
+                throw new ArgumentException("privateKey.Count != 32");
+            MontgomeryOperations.scalarmult(sharedKey.Array, sharedKey.Offset, privateKey.Array, privateKey.Offset, publicKey.Array, publicKey.Offset);
+            KeyExchangeOutputHashNaCl(sharedKey.Array, sharedKey.Offset);
+        }
+
+        internal static void EdwardsToMontgomeryX(out FieldElement montgomeryX, ref FieldElement edwardsY, ref FieldElement edwardsZ)
+        {
+            FieldElement tempX, tempZ;
+            FieldOperations.fe_add(out tempX, ref edwardsZ, ref edwardsY);
+            FieldOperations.fe_sub(out tempZ, ref edwardsZ, ref edwardsY);
+            FieldOperations.fe_invert(out tempZ, ref tempZ);
+            FieldOperations.fe_mul(out montgomeryX, ref tempX, ref tempZ);
+        }
+    }
+}
+#pragma warning restore CS1591 // Fehledes XML-Kommentar für öffentlich sichtbaren Typ oder Element
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Poly1305Donna.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Poly1305Donna.cs
new file mode 100644
index 000000000..fff69d2e9
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Poly1305Donna.cs
@@ -0,0 +1,154 @@
+using System;
+using System.Collections.Generic;
+
+namespace Chaos.NaCl.Internal
+{
+    internal class Poly1305Donna
+    {
+        // written by floodyberry (Andrew M.)
+        // original license: MIT or PUBLIC DOMAIN
+        // https://github.com/floodyberry/poly1305-donna/blob/master/poly1305-donna-unrolled.c
+        public static void poly1305_auth(byte[] output, int outputOffset, byte[] m, int mStart, int mLength, ref Array8<UInt32> key)
+        {
+            UInt32 t0, t1, t2, t3;
+            UInt32 h0, h1, h2, h3, h4;
+            UInt32 r0, r1, r2, r3, r4;
+            UInt32 s1, s2, s3, s4;
+            UInt32 b, nb;
+            int j;
+            UInt64 tt0, tt1, tt2, tt3, tt4;
+            UInt64 f0, f1, f2, f3;
+            UInt32 g0, g1, g2, g3, g4;
+            UInt64 c;
+
+            /* clamp key */
+            t0 = key.x0;
+            t1 = key.x1;
+            t2 = key.x2;
+            t3 = key.x3;
+
+            /* precompute multipliers */
+            r0 = t0 & 0x3ffffff; t0 >>= 26; t0 |= t1 << 6;
+            r1 = t0 & 0x3ffff03; t1 >>= 20; t1 |= t2 << 12;
+            r2 = t1 & 0x3ffc0ff; t2 >>= 14; t2 |= t3 << 18;
+            r3 = t2 & 0x3f03fff; t3 >>= 8;
+            r4 = t3 & 0x00fffff;
+
+            s1 = r1 * 5;
+            s2 = r2 * 5;
+            s3 = r3 * 5;
+            s4 = r4 * 5;
+
+            /* init state */
+            h0 = 0;
+            h1 = 0;
+            h2 = 0;
+            h3 = 0;
+            h4 = 0;
+
+            /* full blocks */
+            if (mLength < 16)
+                goto poly1305_donna_atmost15bytes;
+
+        poly1305_donna_16bytes:
+            mStart += 16;
+            mLength -= 16;
+
+            t0 = ByteIntegerConverter.LoadLittleEndian32(m, mStart - 16);
+            t1 = ByteIntegerConverter.LoadLittleEndian32(m, mStart - 12);
+            t2 = ByteIntegerConverter.LoadLittleEndian32(m, mStart - 8);
+            t3 = ByteIntegerConverter.LoadLittleEndian32(m, mStart - 4);
+
+            //todo: looks like these can be simplified a bit
+            h0 += t0 & 0x3ffffff;
+            h1 += (uint)(((((UInt64)t1 << 32) | t0) >> 26) & 0x3ffffff);
+            h2 += (uint)(((((UInt64)t2 << 32) | t1) >> 20) & 0x3ffffff);
+            h3 += (uint)(((((UInt64)t3 << 32) | t2) >> 14) & 0x3ffffff);
+            h4 += (t3 >> 8) | (1 << 24);
+
+
+        poly1305_donna_mul:
+            tt0 = (ulong)h0 * r0 + (ulong)h1 * s4 + (ulong)h2 * s3 + (ulong)h3 * s2 + (ulong)h4 * s1;
+            tt1 = (ulong)h0 * r1 + (ulong)h1 * r0 + (ulong)h2 * s4 + (ulong)h3 * s3 + (ulong)h4 * s2;
+            tt2 = (ulong)h0 * r2 + (ulong)h1 * r1 + (ulong)h2 * r0 + (ulong)h3 * s4 + (ulong)h4 * s3;
+            tt3 = (ulong)h0 * r3 + (ulong)h1 * r2 + (ulong)h2 * r1 + (ulong)h3 * r0 + (ulong)h4 * s4;
+            tt4 = (ulong)h0 * r4 + (ulong)h1 * r3 + (ulong)h2 * r2 + (ulong)h3 * r1 + (ulong)h4 * r0;
+
+            unchecked
+            {
+                h0 = (UInt32)tt0 & 0x3ffffff; c = (tt0 >> 26);
+                tt1 += c; h1 = (UInt32)tt1 & 0x3ffffff; b = (UInt32)(tt1 >> 26);
+                tt2 += b; h2 = (UInt32)tt2 & 0x3ffffff; b = (UInt32)(tt2 >> 26);
+                tt3 += b; h3 = (UInt32)tt3 & 0x3ffffff; b = (UInt32)(tt3 >> 26);
+                tt4 += b; h4 = (UInt32)tt4 & 0x3ffffff; b = (UInt32)(tt4 >> 26);
+            }
+            h0 += b * 5;
+
+            if (mLength >= 16)
+                goto poly1305_donna_16bytes;
+
+    /* final bytes */
+        poly1305_donna_atmost15bytes:
+            if (mLength == 0)
+                goto poly1305_donna_finish;
+
+            byte[] mp = new byte[16];//todo remove allocation
+
+            for (j = 0; j < mLength; j++)
+                mp[j] = m[mStart + j];
+            mp[j++] = 1;
+            for (; j < 16; j++)
+                mp[j] = 0;
+            mLength = 0;
+
+            t0 = ByteIntegerConverter.LoadLittleEndian32(mp, 0);
+            t1 = ByteIntegerConverter.LoadLittleEndian32(mp, 4);
+            t2 = ByteIntegerConverter.LoadLittleEndian32(mp, 8);
+            t3 = ByteIntegerConverter.LoadLittleEndian32(mp, 12);
+            CryptoBytes.Wipe(mp);
+
+            h0 += t0 & 0x3ffffff;
+            h1 += (uint)(((((UInt64)t1 << 32) | t0) >> 26) & 0x3ffffff);
+            h2 += (uint)(((((UInt64)t2 << 32) | t1) >> 20) & 0x3ffffff);
+            h3 += (uint)(((((UInt64)t3 << 32) | t2) >> 14) & 0x3ffffff);
+            h4 += t3 >> 8;
+
+            goto poly1305_donna_mul;
+
+        poly1305_donna_finish:
+            b = h0 >> 26; h0 = h0 & 0x3ffffff;
+            h1 += b; b = h1 >> 26; h1 = h1 & 0x3ffffff;
+            h2 += b; b = h2 >> 26; h2 = h2 & 0x3ffffff;
+            h3 += b; b = h3 >> 26; h3 = h3 & 0x3ffffff;
+            h4 += b; b = h4 >> 26; h4 = h4 & 0x3ffffff;
+            h0 += b * 5;
+
+            g0 = h0 + 5; b = g0 >> 26; g0 &= 0x3ffffff;
+            g1 = h1 + b; b = g1 >> 26; g1 &= 0x3ffffff;
+            g2 = h2 + b; b = g2 >> 26; g2 &= 0x3ffffff;
+            g3 = h3 + b; b = g3 >> 26; g3 &= 0x3ffffff;
+            g4 = unchecked(h4 + b - (1 << 26));
+
+            b = (g4 >> 31) - 1;
+            nb = ~b;
+            h0 = (h0 & nb) | (g0 & b);
+            h1 = (h1 & nb) | (g1 & b);
+            h2 = (h2 & nb) | (g2 & b);
+            h3 = (h3 & nb) | (g3 & b);
+            h4 = (h4 & nb) | (g4 & b);
+
+            f0 = ((h0) | (h1 << 26)) + (UInt64)key.x4;
+            f1 = ((h1 >> 6) | (h2 << 20)) + (UInt64)key.x5;
+            f2 = ((h2 >> 12) | (h3 << 14)) + (UInt64)key.x6;
+            f3 = ((h3 >> 18) | (h4 << 8)) + (UInt64)key.x7;
+
+            unchecked
+            {
+                ByteIntegerConverter.StoreLittleEndian32(output, outputOffset + 0, (uint)f0); f1 += (f0 >> 32);
+                ByteIntegerConverter.StoreLittleEndian32(output, outputOffset + 4, (uint)f1); f2 += (f1 >> 32);
+                ByteIntegerConverter.StoreLittleEndian32(output, outputOffset + 8, (uint)f2); f3 += (f2 >> 32);
+                ByteIntegerConverter.StoreLittleEndian32(output, outputOffset + 12, (uint)f3);
+            }
+        }
+    }
+}
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Salsa/Salsa20.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Salsa/Salsa20.cs
new file mode 100644
index 000000000..4578f6436
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Salsa/Salsa20.cs
@@ -0,0 +1,45 @@
+using System;
+using System.Collections.Generic;
+
+namespace Chaos.NaCl.Internal.Salsa
+{
+    internal class Salsa20
+    {
+        public const uint SalsaConst0 = 0x61707865;
+        public const uint SalsaConst1 = 0x3320646e;
+        public const uint SalsaConst2 = 0x79622d32;
+        public const uint SalsaConst3 = 0x6b206574;
+
+        public static void HSalsa20(byte[] output, int outputOffset, byte[] key, int keyOffset, byte[] nonce, int nonceOffset)
+        {
+            Array16<UInt32> state;
+            state.x0 = SalsaConst0;
+            state.x1 = ByteIntegerConverter.LoadLittleEndian32(key, keyOffset + 0);
+            state.x2 = ByteIntegerConverter.LoadLittleEndian32(key, keyOffset + 4);
+            state.x3 = ByteIntegerConverter.LoadLittleEndian32(key, keyOffset + 8);
+            state.x4 = ByteIntegerConverter.LoadLittleEndian32(key, keyOffset + 12);
+            state.x5 = SalsaConst1;
+            state.x6 = ByteIntegerConverter.LoadLittleEndian32(nonce, nonceOffset + 0);
+            state.x7 = ByteIntegerConverter.LoadLittleEndian32(nonce, nonceOffset + 4);
+            state.x8 = ByteIntegerConverter.LoadLittleEndian32(nonce, nonceOffset + 8);
+            state.x9 = ByteIntegerConverter.LoadLittleEndian32(nonce, nonceOffset + 12);
+            state.x10 = SalsaConst2;
+            state.x11 = ByteIntegerConverter.LoadLittleEndian32(key, keyOffset + 16);
+            state.x12 = ByteIntegerConverter.LoadLittleEndian32(key, keyOffset + 20);
+            state.x13 = ByteIntegerConverter.LoadLittleEndian32(key, keyOffset + 24);
+            state.x14 = ByteIntegerConverter.LoadLittleEndian32(key, keyOffset + 28);
+            state.x15 = SalsaConst3;
+
+            SalsaCore.HSalsa(out state, ref state, 20);
+
+            ByteIntegerConverter.StoreLittleEndian32(output, outputOffset + 0, state.x0);
+            ByteIntegerConverter.StoreLittleEndian32(output, outputOffset + 4, state.x5);
+            ByteIntegerConverter.StoreLittleEndian32(output, outputOffset + 8, state.x10);
+            ByteIntegerConverter.StoreLittleEndian32(output, outputOffset + 12, state.x15);
+            ByteIntegerConverter.StoreLittleEndian32(output, outputOffset + 16, state.x6);
+            ByteIntegerConverter.StoreLittleEndian32(output, outputOffset + 20, state.x7);
+            ByteIntegerConverter.StoreLittleEndian32(output, outputOffset + 24, state.x8);
+            ByteIntegerConverter.StoreLittleEndian32(output, outputOffset + 28, state.x9);
+        }
+    }
+}
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Salsa/SalsaCore.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Salsa/SalsaCore.cs
new file mode 100644
index 000000000..8e3ecad7b
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Salsa/SalsaCore.cs
@@ -0,0 +1,263 @@
+using System;
+using System.Collections.Generic;
+
+namespace Chaos.NaCl.Internal.Salsa
+{
+    internal static class SalsaCore
+    {
+        public static void HSalsa(out Array16<UInt32> output, ref Array16<UInt32> input, int rounds)
+        {
+            InternalAssert.Assert(rounds % 2 == 0, "Number of salsa rounds must be even");
+
+            int doubleRounds = rounds / 2;
+
+            UInt32 x0 = input.x0;
+            UInt32 x1 = input.x1;
+            UInt32 x2 = input.x2;
+            UInt32 x3 = input.x3;
+            UInt32 x4 = input.x4;
+            UInt32 x5 = input.x5;
+            UInt32 x6 = input.x6;
+            UInt32 x7 = input.x7;
+            UInt32 x8 = input.x8;
+            UInt32 x9 = input.x9;
+            UInt32 x10 = input.x10;
+            UInt32 x11 = input.x11;
+            UInt32 x12 = input.x12;
+            UInt32 x13 = input.x13;
+            UInt32 x14 = input.x14;
+            UInt32 x15 = input.x15;
+
+            unchecked
+            {
+                for (int i = 0; i < doubleRounds; i++)
+                {
+                    UInt32 y;
+
+                    // row 0
+                    y = x0 + x12;
+                    x4 ^= (y << 7) | (y >> (32 - 7));
+                    y = x4 + x0;
+                    x8 ^= (y << 9) | (y >> (32 - 9));
+                    y = x8 + x4;
+                    x12 ^= (y << 13) | (y >> (32 - 13));
+                    y = x12 + x8;
+                    x0 ^= (y << 18) | (y >> (32 - 18));
+
+                    // row 1
+                    y = x5 + x1;
+                    x9 ^= (y << 7) | (y >> (32 - 7));
+                    y = x9 + x5;
+                    x13 ^= (y << 9) | (y >> (32 - 9));
+                    y = x13 + x9;
+                    x1 ^= (y << 13) | (y >> (32 - 13));
+                    y = x1 + x13;
+                    x5 ^= (y << 18) | (y >> (32 - 18));
+
+                    // row 2
+                    y = x10 + x6;
+                    x14 ^= (y << 7) | (y >> (32 - 7));
+                    y = x14 + x10;
+                    x2 ^= (y << 9) | (y >> (32 - 9));
+                    y = x2 + x14;
+                    x6 ^= (y << 13) | (y >> (32 - 13));
+                    y = x6 + x2;
+                    x10 ^= (y << 18) | (y >> (32 - 18));
+
+                    // row 3
+                    y = x15 + x11;
+                    x3 ^= (y << 7) | (y >> (32 - 7));
+                    y = x3 + x15;
+                    x7 ^= (y << 9) | (y >> (32 - 9));
+                    y = x7 + x3;
+                    x11 ^= (y << 13) | (y >> (32 - 13));
+                    y = x11 + x7;
+                    x15 ^= (y << 18) | (y >> (32 - 18));
+
+                    // column 0
+                    y = x0 + x3;
+                    x1 ^= (y << 7) | (y >> (32 - 7));
+                    y = x1 + x0;
+                    x2 ^= (y << 9) | (y >> (32 - 9));
+                    y = x2 + x1;
+                    x3 ^= (y << 13) | (y >> (32 - 13));
+                    y = x3 + x2;
+                    x0 ^= (y << 18) | (y >> (32 - 18));
+
+                    // column 1
+                    y = x5 + x4;
+                    x6 ^= (y << 7) | (y >> (32 - 7));
+                    y = x6 + x5;
+                    x7 ^= (y << 9) | (y >> (32 - 9));
+                    y = x7 + x6;
+                    x4 ^= (y << 13) | (y >> (32 - 13));
+                    y = x4 + x7;
+                    x5 ^= (y << 18) | (y >> (32 - 18));
+
+                    // column 2
+                    y = x10 + x9;
+                    x11 ^= (y << 7) | (y >> (32 - 7));
+                    y = x11 + x10;
+                    x8 ^= (y << 9) | (y >> (32 - 9));
+                    y = x8 + x11;
+                    x9 ^= (y << 13) | (y >> (32 - 13));
+                    y = x9 + x8;
+                    x10 ^= (y << 18) | (y >> (32 - 18));
+
+                    // column 3
+                    y = x15 + x14;
+                    x12 ^= (y << 7) | (y >> (32 - 7));
+                    y = x12 + x15;
+                    x13 ^= (y << 9) | (y >> (32 - 9));
+                    y = x13 + x12;
+                    x14 ^= (y << 13) | (y >> (32 - 13));
+                    y = x14 + x13;
+                    x15 ^= (y << 18) | (y >> (32 - 18));
+                }
+            }
+
+            output.x0 = x0;
+            output.x1 = x1;
+            output.x2 = x2;
+            output.x3 = x3;
+            output.x4 = x4;
+            output.x5 = x5;
+            output.x6 = x6;
+            output.x7 = x7;
+            output.x8 = x8;
+            output.x9 = x9;
+            output.x10 = x10;
+            output.x11 = x11;
+            output.x12 = x12;
+            output.x13 = x13;
+            output.x14 = x14;
+            output.x15 = x15;
+        }
+
+        public static void Salsa(out Array16<UInt32> output, ref Array16<UInt32> input, int rounds)
+        {
+            Array16<UInt32> temp;
+            HSalsa(out temp, ref input, rounds);
+            unchecked
+            {
+                output.x0 = temp.x0 + input.x0;
+                output.x1 = temp.x1 + input.x1;
+                output.x2 = temp.x2 + input.x2;
+                output.x3 = temp.x3 + input.x3;
+                output.x4 = temp.x4 + input.x4;
+                output.x5 = temp.x5 + input.x5;
+                output.x6 = temp.x6 + input.x6;
+                output.x7 = temp.x7 + input.x7;
+                output.x8 = temp.x8 + input.x8;
+                output.x9 = temp.x9 + input.x9;
+                output.x10 = temp.x10 + input.x10;
+                output.x11 = temp.x11 + input.x11;
+                output.x12 = temp.x12 + input.x12;
+                output.x13 = temp.x13 + input.x13;
+                output.x14 = temp.x14 + input.x14;
+                output.x15 = temp.x15 + input.x15;
+            }
+        }
+
+        /*public static void SalsaCore(int[] output, int outputOffset, int[] input, int inputOffset, int rounds)
+        {
+            if (rounds % 2 != 0)
+                throw new ArgumentException("rounds must be even");
+        }
+
+
+static void store_littleendian(unsigned char *x,uint32 u)
+{
+  x[0] = u; u >>= 8;
+  x[1] = u; u >>= 8;
+  x[2] = u; u >>= 8;
+  x[3] = u;
+}
+
+        public static void HSalsaCore(int[] output, int outputOffset, int[] input, int inputOffset, int rounds)
+        {
+            if (rounds % 2 != 0)
+                throw new ArgumentException("rounds must be even");
+            static uint32 rotate(uint32 u,int c)
+{
+  return (u << c) | (u >> (32 - c));
+}
+
+
+
+int crypto_core(
+        unsigned char *out,
+  const unsigned char *in,
+  const unsigned char *k,
+  const unsigned char *c
+)
+{
+  uint32 x0, x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, x13, x14, x15;
+  int i;
+
+  x0 = load_littleendian(c + 0);
+  x1 = load_littleendian(k + 0);
+  x2 = load_littleendian(k + 4);
+  x3 = load_littleendian(k + 8);
+  x4 = load_littleendian(k + 12);
+  x5 = load_littleendian(c + 4);
+  x6 = load_littleendian(in + 0);
+  x7 = load_littleendian(in + 4);
+  x8 = load_littleendian(in + 8);
+  x9 = load_littleendian(in + 12);
+  x10 = load_littleendian(c + 8);
+  x11 = load_littleendian(k + 16);
+  x12 = load_littleendian(k + 20);
+  x13 = load_littleendian(k + 24);
+  x14 = load_littleendian(k + 28);
+  x15 = load_littleendian(c + 12);
+
+  for (i = ROUNDS;i > 0;i -= 2) {
+     x4 ^= rotate( x0+x12, 7);
+     x8 ^= rotate( x4+ x0, 9);
+    x12 ^= rotate( x8+ x4,13);
+     x0 ^= rotate(x12+ x8,18);
+     x9 ^= rotate( x5+ x1, 7);
+    x13 ^= rotate( x9+ x5, 9);
+     x1 ^= rotate(x13+ x9,13);
+     x5 ^= rotate( x1+x13,18);
+    x14 ^= rotate(x10+ x6, 7);
+     x2 ^= rotate(x14+x10, 9);
+     x6 ^= rotate( x2+x14,13);
+    x10 ^= rotate( x6+ x2,18);
+     x3 ^= rotate(x15+x11, 7);
+     x7 ^= rotate( x3+x15, 9);
+    x11 ^= rotate( x7+ x3,13);
+    x15 ^= rotate(x11+ x7,18);
+     x1 ^= rotate( x0+ x3, 7);
+     x2 ^= rotate( x1+ x0, 9);
+     x3 ^= rotate( x2+ x1,13);
+     x0 ^= rotate( x3+ x2,18);
+     x6 ^= rotate( x5+ x4, 7);
+     x7 ^= rotate( x6+ x5, 9);
+     x4 ^= rotate( x7+ x6,13);
+     x5 ^= rotate( x4+ x7,18);
+    x11 ^= rotate(x10+ x9, 7);
+     x8 ^= rotate(x11+x10, 9);
+     x9 ^= rotate( x8+x11,13);
+    x10 ^= rotate( x9+ x8,18);
+    x12 ^= rotate(x15+x14, 7);
+    x13 ^= rotate(x12+x15, 9);
+    x14 ^= rotate(x13+x12,13);
+    x15 ^= rotate(x14+x13,18);
+  }
+
+  store_littleendian(out + 0,x0);
+  store_littleendian(out + 4,x5);
+  store_littleendian(out + 8,x10);
+  store_littleendian(out + 12,x15);
+  store_littleendian(out + 16,x6);
+  store_littleendian(out + 20,x7);
+  store_littleendian(out + 24,x8);
+  store_littleendian(out + 28,x9);
+
+  return 0;
+}*/
+
+    }
+}
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Salsa/replace regex.txt b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Salsa/replace regex.txt
new file mode 100644
index 000000000..f4856899e
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Salsa/replace regex.txt	
@@ -0,0 +1,2 @@
+x(\d+) ^= rotate\((.+), (\d+)\);
+y = \2;\r\nx\1 ^= (y << \3) | (y >> (32 - \3));
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Sha512.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Sha512.cs
new file mode 100644
index 000000000..425de2c2e
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Sha512.cs
@@ -0,0 +1,133 @@
+#pragma warning disable CS1591 // Fehledes XML-Kommentar für öffentlich sichtbaren Typ oder Element
+using System;
+using Chaos.NaCl.Internal;
+
+namespace Chaos.NaCl
+{
+    public class Sha512
+    {
+        private Array8<UInt64> _state;
+        private readonly byte[] _buffer;
+        private ulong _totalBytes;
+        public const int BlockSize = 128;
+        private static readonly byte[] _padding = new byte[] { 0x80 };
+
+        public Sha512()
+        {
+            _buffer = new byte[BlockSize];//todo: remove allocation
+            Init();
+        }
+
+        public void Init()
+        {
+            Sha512Internal.Sha512Init(out _state);
+            _totalBytes = 0;
+        }
+
+        public void Update(ArraySegment<byte> data)
+        {
+            if (data.Array == null)
+                throw new ArgumentNullException("data.Array");
+            Update(data.Array, data.Offset, data.Count);
+        }
+
+        public void Update(byte[] data, int offset, int count)
+        {
+            if (data == null)
+                throw new ArgumentNullException("data");
+            if (offset < 0)
+                throw new ArgumentOutOfRangeException("offset");
+            if (count < 0)
+                throw new ArgumentOutOfRangeException("count");
+            if (data.Length - offset < count)
+                throw new ArgumentException("Requires offset + count <= data.Length");
+
+            Array16<ulong> block;
+            int bytesInBuffer = (int)_totalBytes & (BlockSize - 1);
+            _totalBytes += (uint)count;
+
+            if (_totalBytes >= ulong.MaxValue / 8)
+                throw new InvalidOperationException("Too much data");
+            // Fill existing buffer
+            if (bytesInBuffer != 0)
+            {
+                var toCopy = Math.Min(BlockSize - bytesInBuffer, count);
+                Buffer.BlockCopy(data, offset, _buffer, bytesInBuffer, toCopy);
+                offset += toCopy;
+                count -= toCopy;
+                bytesInBuffer += toCopy;
+                if (bytesInBuffer == BlockSize)
+                {
+                    ByteIntegerConverter.Array16LoadBigEndian64(out block, _buffer, 0);
+                    Sha512Internal.Core(out _state, ref _state, ref block);
+                    CryptoBytes.InternalWipe(_buffer, 0, _buffer.Length);
+                    bytesInBuffer = 0;
+                }
+            }
+            // Hash complete blocks without copying
+            while (count >= BlockSize)
+            {
+                ByteIntegerConverter.Array16LoadBigEndian64(out block, data, offset);
+                Sha512Internal.Core(out _state, ref _state, ref block);
+                offset += BlockSize;
+                count -= BlockSize;
+            }
+            // Copy remainder into buffer
+            if (count > 0)
+            {
+                Buffer.BlockCopy(data, offset, _buffer, bytesInBuffer, count);
+            }
+        }
+
+        public void Finish(ArraySegment<byte> output)
+        {
+            if (output.Array == null)
+                throw new ArgumentNullException("output.Array");
+            if (output.Count != 64)
+                throw new ArgumentException("output.Count must be 64");
+
+            Update(_padding, 0, _padding.Length);
+            Array16<ulong> block;
+            ByteIntegerConverter.Array16LoadBigEndian64(out block, _buffer, 0);
+            CryptoBytes.InternalWipe(_buffer, 0, _buffer.Length);
+            int bytesInBuffer = (int)_totalBytes & (BlockSize - 1);
+            if (bytesInBuffer > BlockSize - 16)
+            {
+                Sha512Internal.Core(out _state, ref _state, ref block);
+                block = default(Array16<ulong>);
+            }
+            block.x15 = (_totalBytes - 1) * 8;
+            Sha512Internal.Core(out _state, ref _state, ref block);
+
+            ByteIntegerConverter.StoreBigEndian64(output.Array, output.Offset + 0, _state.x0);
+            ByteIntegerConverter.StoreBigEndian64(output.Array, output.Offset + 8, _state.x1);
+            ByteIntegerConverter.StoreBigEndian64(output.Array, output.Offset + 16, _state.x2);
+            ByteIntegerConverter.StoreBigEndian64(output.Array, output.Offset + 24, _state.x3);
+            ByteIntegerConverter.StoreBigEndian64(output.Array, output.Offset + 32, _state.x4);
+            ByteIntegerConverter.StoreBigEndian64(output.Array, output.Offset + 40, _state.x5);
+            ByteIntegerConverter.StoreBigEndian64(output.Array, output.Offset + 48, _state.x6);
+            ByteIntegerConverter.StoreBigEndian64(output.Array, output.Offset + 56, _state.x7);
+            _state = default(Array8<ulong>);
+        }
+
+        public byte[] Finish()
+        {
+            var result = new byte[64];
+            Finish(new ArraySegment<byte>(result));
+            return result;
+        }
+
+        public static byte[] Hash(byte[] data)
+        {
+            return Hash(data, 0, data.Length);
+        }
+
+        public static byte[] Hash(byte[] data, int offset, int count)
+        {
+            var hasher = new Sha512();
+            hasher.Update(data, offset, count);
+            return hasher.Finish();
+        }
+    }
+}
+#pragma warning restore CS1591 // Fehledes XML-Kommentar für öffentlich sichtbaren Typ oder Element
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Sha512Internal.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Sha512Internal.cs
new file mode 100644
index 000000000..37670d090
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/Sha512Internal.cs
@@ -0,0 +1,447 @@
+using System;
+using System.Collections.Generic;
+
+namespace Chaos.NaCl.Internal
+{
+    internal static class Sha512Internal
+    {
+        private static readonly UInt64[] K = new UInt64[]
+            {
+                0x428a2f98d728ae22,0x7137449123ef65cd,0xb5c0fbcfec4d3b2f,0xe9b5dba58189dbbc,
+                0x3956c25bf348b538,0x59f111f1b605d019,0x923f82a4af194f9b,0xab1c5ed5da6d8118,
+                0xd807aa98a3030242,0x12835b0145706fbe,0x243185be4ee4b28c,0x550c7dc3d5ffb4e2,
+                0x72be5d74f27b896f,0x80deb1fe3b1696b1,0x9bdc06a725c71235,0xc19bf174cf692694,
+                0xe49b69c19ef14ad2,0xefbe4786384f25e3,0x0fc19dc68b8cd5b5,0x240ca1cc77ac9c65,
+                0x2de92c6f592b0275,0x4a7484aa6ea6e483,0x5cb0a9dcbd41fbd4,0x76f988da831153b5,
+                0x983e5152ee66dfab,0xa831c66d2db43210,0xb00327c898fb213f,0xbf597fc7beef0ee4,
+                0xc6e00bf33da88fc2,0xd5a79147930aa725,0x06ca6351e003826f,0x142929670a0e6e70,
+                0x27b70a8546d22ffc,0x2e1b21385c26c926,0x4d2c6dfc5ac42aed,0x53380d139d95b3df,
+                0x650a73548baf63de,0x766a0abb3c77b2a8,0x81c2c92e47edaee6,0x92722c851482353b,
+                0xa2bfe8a14cf10364,0xa81a664bbc423001,0xc24b8b70d0f89791,0xc76c51a30654be30,
+                0xd192e819d6ef5218,0xd69906245565a910,0xf40e35855771202a,0x106aa07032bbd1b8,
+                0x19a4c116b8d2d0c8,0x1e376c085141ab53,0x2748774cdf8eeb99,0x34b0bcb5e19b48a8,
+                0x391c0cb3c5c95a63,0x4ed8aa4ae3418acb,0x5b9cca4f7763e373,0x682e6ff3d6b2b8a3,
+                0x748f82ee5defb2fc,0x78a5636f43172f60,0x84c87814a1f0ab72,0x8cc702081a6439ec,
+                0x90befffa23631e28,0xa4506cebde82bde9,0xbef9a3f7b2c67915,0xc67178f2e372532b,
+                0xca273eceea26619c,0xd186b8c721c0c207,0xeada7dd6cde0eb1e,0xf57d4f7fee6ed178,
+                0x06f067aa72176fba,0x0a637dc5a2c898a6,0x113f9804bef90dae,0x1b710b35131c471b,
+                0x28db77f523047d84,0x32caab7b40c72493,0x3c9ebe0a15c9bebc,0x431d67c49c100d4c,
+                0x4cc5d4becb3e42b6,0x597f299cfc657e2a,0x5fcb6fab3ad6faec,0x6c44198c4a475817
+            };
+
+        internal static void Sha512Init(out Array8<UInt64> state)
+        {
+            state.x0 = 0x6a09e667f3bcc908;
+            state.x1 = 0xbb67ae8584caa73b;
+            state.x2 = 0x3c6ef372fe94f82b;
+            state.x3 = 0xa54ff53a5f1d36f1;
+            state.x4 = 0x510e527fade682d1;
+            state.x5 = 0x9b05688c2b3e6c1f;
+            state.x6 = 0x1f83d9abfb41bd6b;
+            state.x7 = 0x5be0cd19137e2179;
+        }
+
+        internal static void Core(out Array8<UInt64> outputState, ref Array8<UInt64> inputState, ref Array16<UInt64> input)
+        {
+            unchecked
+            {
+                UInt64 a = inputState.x0;
+                UInt64 b = inputState.x1;
+                UInt64 c = inputState.x2;
+                UInt64 d = inputState.x3;
+                UInt64 e = inputState.x4;
+                UInt64 f = inputState.x5;
+                UInt64 g = inputState.x6;
+                UInt64 h = inputState.x7;
+
+                UInt64 w0 = input.x0;
+                UInt64 w1 = input.x1;
+                UInt64 w2 = input.x2;
+                UInt64 w3 = input.x3;
+                UInt64 w4 = input.x4;
+                UInt64 w5 = input.x5;
+                UInt64 w6 = input.x6;
+                UInt64 w7 = input.x7;
+                UInt64 w8 = input.x8;
+                UInt64 w9 = input.x9;
+                UInt64 w10 = input.x10;
+                UInt64 w11 = input.x11;
+                UInt64 w12 = input.x12;
+                UInt64 w13 = input.x13;
+                UInt64 w14 = input.x14;
+                UInt64 w15 = input.x15;
+
+                int t = 0;
+                while (true)
+                {
+                    ulong t1, t2;
+
+                    {//0
+                        t1 = h +
+                             ((e >> 14) ^ (e << (64 - 14)) ^ (e >> 18) ^ (e << (64 - 18)) ^ (e >> 41) ^ (e << (64 - 41))) +
+                            //Sigma1(e)
+                             ((e & f) ^ (~e & g)) + //Ch(e,f,g)
+                             K[t] + w0;
+                        t2 = ((a >> 28) ^ (a << (64 - 28)) ^ (a >> 34) ^ (a << (64 - 34)) ^ (a >> 39) ^ (a << (64 - 39))) +
+                            //Sigma0(a)
+                             ((a & b) ^ (a & c) ^ (b & c)); //Maj(a,b,c)
+                        h = g;
+                        g = f;
+                        f = e;
+                        e = d + t1;
+                        d = c;
+                        c = b;
+                        b = a;
+                        a = t1 + t2;
+                        t++;
+                    }
+                    {//1
+                        t1 = h +
+                             ((e >> 14) ^ (e << (64 - 14)) ^ (e >> 18) ^ (e << (64 - 18)) ^ (e >> 41) ^ (e << (64 - 41))) +
+                            //Sigma1(e)
+                             ((e & f) ^ (~e & g)) + //Ch(e,f,g)
+                             K[t] + w1;
+                        t2 = ((a >> 28) ^ (a << (64 - 28)) ^ (a >> 34) ^ (a << (64 - 34)) ^ (a >> 39) ^ (a << (64 - 39))) +
+                            //Sigma0(a)
+                             ((a & b) ^ (a & c) ^ (b & c)); //Maj(a,b,c)
+                        h = g;
+                        g = f;
+                        f = e;
+                        e = d + t1;
+                        d = c;
+                        c = b;
+                        b = a;
+                        a = t1 + t2;
+                        t++;
+                    }
+                    {//2
+                        t1 = h +
+                             ((e >> 14) ^ (e << (64 - 14)) ^ (e >> 18) ^ (e << (64 - 18)) ^ (e >> 41) ^ (e << (64 - 41))) +
+                            //Sigma1(e)
+                             ((e & f) ^ (~e & g)) + //Ch(e,f,g)
+                             K[t] + w2;
+                        t2 = ((a >> 28) ^ (a << (64 - 28)) ^ (a >> 34) ^ (a << (64 - 34)) ^ (a >> 39) ^ (a << (64 - 39))) +
+                            //Sigma0(a)
+                             ((a & b) ^ (a & c) ^ (b & c)); //Maj(a,b,c)
+                        h = g;
+                        g = f;
+                        f = e;
+                        e = d + t1;
+                        d = c;
+                        c = b;
+                        b = a;
+                        a = t1 + t2;
+                        t++;
+                    }
+                    {//3
+                        t1 = h +
+                             ((e >> 14) ^ (e << (64 - 14)) ^ (e >> 18) ^ (e << (64 - 18)) ^ (e >> 41) ^ (e << (64 - 41))) +
+                            //Sigma1(e)
+                             ((e & f) ^ (~e & g)) + //Ch(e,f,g)
+                             K[t] + w3;
+                        t2 = ((a >> 28) ^ (a << (64 - 28)) ^ (a >> 34) ^ (a << (64 - 34)) ^ (a >> 39) ^ (a << (64 - 39))) +
+                            //Sigma0(a)
+                             ((a & b) ^ (a & c) ^ (b & c)); //Maj(a,b,c)
+                        h = g;
+                        g = f;
+                        f = e;
+                        e = d + t1;
+                        d = c;
+                        c = b;
+                        b = a;
+                        a = t1 + t2;
+                        t++;
+                    }
+                    {//4
+                        t1 = h +
+                             ((e >> 14) ^ (e << (64 - 14)) ^ (e >> 18) ^ (e << (64 - 18)) ^ (e >> 41) ^ (e << (64 - 41))) +
+                            //Sigma1(e)
+                             ((e & f) ^ (~e & g)) + //Ch(e,f,g)
+                             K[t] + w4;
+                        t2 = ((a >> 28) ^ (a << (64 - 28)) ^ (a >> 34) ^ (a << (64 - 34)) ^ (a >> 39) ^ (a << (64 - 39))) +
+                            //Sigma0(a)
+                             ((a & b) ^ (a & c) ^ (b & c)); //Maj(a,b,c)
+                        h = g;
+                        g = f;
+                        f = e;
+                        e = d + t1;
+                        d = c;
+                        c = b;
+                        b = a;
+                        a = t1 + t2;
+                        t++;
+                    }
+                    {//5
+                        t1 = h +
+                             ((e >> 14) ^ (e << (64 - 14)) ^ (e >> 18) ^ (e << (64 - 18)) ^ (e >> 41) ^ (e << (64 - 41))) +
+                            //Sigma1(e)
+                             ((e & f) ^ (~e & g)) + //Ch(e,f,g)
+                             K[t] + w5;
+                        t2 = ((a >> 28) ^ (a << (64 - 28)) ^ (a >> 34) ^ (a << (64 - 34)) ^ (a >> 39) ^ (a << (64 - 39))) +
+                            //Sigma0(a)
+                             ((a & b) ^ (a & c) ^ (b & c)); //Maj(a,b,c)
+                        h = g;
+                        g = f;
+                        f = e;
+                        e = d + t1;
+                        d = c;
+                        c = b;
+                        b = a;
+                        a = t1 + t2;
+                        t++;
+                    }
+                    {//6
+                        t1 = h +
+                             ((e >> 14) ^ (e << (64 - 14)) ^ (e >> 18) ^ (e << (64 - 18)) ^ (e >> 41) ^ (e << (64 - 41))) +
+                            //Sigma1(e)
+                             ((e & f) ^ (~e & g)) + //Ch(e,f,g)
+                             K[t] + w6;
+                        t2 = ((a >> 28) ^ (a << (64 - 28)) ^ (a >> 34) ^ (a << (64 - 34)) ^ (a >> 39) ^ (a << (64 - 39))) +
+                            //Sigma0(a)
+                             ((a & b) ^ (a & c) ^ (b & c)); //Maj(a,b,c)
+                        h = g;
+                        g = f;
+                        f = e;
+                        e = d + t1;
+                        d = c;
+                        c = b;
+                        b = a;
+                        a = t1 + t2;
+                        t++;
+                    }
+                    {//7
+                        t1 = h +
+                             ((e >> 14) ^ (e << (64 - 14)) ^ (e >> 18) ^ (e << (64 - 18)) ^ (e >> 41) ^ (e << (64 - 41))) +
+                            //Sigma1(e)
+                             ((e & f) ^ (~e & g)) + //Ch(e,f,g)
+                             K[t] + w7;
+                        t2 = ((a >> 28) ^ (a << (64 - 28)) ^ (a >> 34) ^ (a << (64 - 34)) ^ (a >> 39) ^ (a << (64 - 39))) +
+                            //Sigma0(a)
+                             ((a & b) ^ (a & c) ^ (b & c)); //Maj(a,b,c)
+                        h = g;
+                        g = f;
+                        f = e;
+                        e = d + t1;
+                        d = c;
+                        c = b;
+                        b = a;
+                        a = t1 + t2;
+                        t++;
+                    }
+                    {//8
+                        t1 = h +
+                             ((e >> 14) ^ (e << (64 - 14)) ^ (e >> 18) ^ (e << (64 - 18)) ^ (e >> 41) ^ (e << (64 - 41))) +
+                            //Sigma1(e)
+                             ((e & f) ^ (~e & g)) + //Ch(e,f,g)
+                             K[t] + w8;
+                        t2 = ((a >> 28) ^ (a << (64 - 28)) ^ (a >> 34) ^ (a << (64 - 34)) ^ (a >> 39) ^ (a << (64 - 39))) +
+                            //Sigma0(a)
+                             ((a & b) ^ (a & c) ^ (b & c)); //Maj(a,b,c)
+                        h = g;
+                        g = f;
+                        f = e;
+                        e = d + t1;
+                        d = c;
+                        c = b;
+                        b = a;
+                        a = t1 + t2;
+                        t++;
+                    }
+                    {//9
+                        t1 = h +
+                             ((e >> 14) ^ (e << (64 - 14)) ^ (e >> 18) ^ (e << (64 - 18)) ^ (e >> 41) ^ (e << (64 - 41))) +
+                            //Sigma1(e)
+                             ((e & f) ^ (~e & g)) + //Ch(e,f,g)
+                             K[t] + w9;
+                        t2 = ((a >> 28) ^ (a << (64 - 28)) ^ (a >> 34) ^ (a << (64 - 34)) ^ (a >> 39) ^ (a << (64 - 39))) +
+                            //Sigma0(a)
+                             ((a & b) ^ (a & c) ^ (b & c)); //Maj(a,b,c)
+                        h = g;
+                        g = f;
+                        f = e;
+                        e = d + t1;
+                        d = c;
+                        c = b;
+                        b = a;
+                        a = t1 + t2;
+                        t++;
+                    }
+                    {//10
+                        t1 = h +
+                             ((e >> 14) ^ (e << (64 - 14)) ^ (e >> 18) ^ (e << (64 - 18)) ^ (e >> 41) ^ (e << (64 - 41))) +
+                            //Sigma1(e)
+                             ((e & f) ^ (~e & g)) + //Ch(e,f,g)
+                             K[t] + w10;
+                        t2 = ((a >> 28) ^ (a << (64 - 28)) ^ (a >> 34) ^ (a << (64 - 34)) ^ (a >> 39) ^ (a << (64 - 39))) +
+                            //Sigma0(a)
+                             ((a & b) ^ (a & c) ^ (b & c)); //Maj(a,b,c)
+                        h = g;
+                        g = f;
+                        f = e;
+                        e = d + t1;
+                        d = c;
+                        c = b;
+                        b = a;
+                        a = t1 + t2;
+                        t++;
+                    }
+                    {//11
+                        t1 = h +
+                             ((e >> 14) ^ (e << (64 - 14)) ^ (e >> 18) ^ (e << (64 - 18)) ^ (e >> 41) ^ (e << (64 - 41))) +
+                            //Sigma1(e)
+                             ((e & f) ^ (~e & g)) + //Ch(e,f,g)
+                             K[t] + w11;
+                        t2 = ((a >> 28) ^ (a << (64 - 28)) ^ (a >> 34) ^ (a << (64 - 34)) ^ (a >> 39) ^ (a << (64 - 39))) +
+                            //Sigma0(a)
+                             ((a & b) ^ (a & c) ^ (b & c)); //Maj(a,b,c)
+                        h = g;
+                        g = f;
+                        f = e;
+                        e = d + t1;
+                        d = c;
+                        c = b;
+                        b = a;
+                        a = t1 + t2;
+                        t++;
+                    }
+                    {//12
+                        t1 = h +
+                             ((e >> 14) ^ (e << (64 - 14)) ^ (e >> 18) ^ (e << (64 - 18)) ^ (e >> 41) ^ (e << (64 - 41))) +
+                            //Sigma1(e)
+                             ((e & f) ^ (~e & g)) + //Ch(e,f,g)
+                             K[t] + w12;
+                        t2 = ((a >> 28) ^ (a << (64 - 28)) ^ (a >> 34) ^ (a << (64 - 34)) ^ (a >> 39) ^ (a << (64 - 39))) +
+                            //Sigma0(a)
+                             ((a & b) ^ (a & c) ^ (b & c)); //Maj(a,b,c)
+                        h = g;
+                        g = f;
+                        f = e;
+                        e = d + t1;
+                        d = c;
+                        c = b;
+                        b = a;
+                        a = t1 + t2;
+                        t++;
+                    }
+                    {//13
+                        t1 = h +
+                             ((e >> 14) ^ (e << (64 - 14)) ^ (e >> 18) ^ (e << (64 - 18)) ^ (e >> 41) ^ (e << (64 - 41))) +
+                            //Sigma1(e)
+                             ((e & f) ^ (~e & g)) + //Ch(e,f,g)
+                             K[t] + w13;
+                        t2 = ((a >> 28) ^ (a << (64 - 28)) ^ (a >> 34) ^ (a << (64 - 34)) ^ (a >> 39) ^ (a << (64 - 39))) +
+                            //Sigma0(a)
+                             ((a & b) ^ (a & c) ^ (b & c)); //Maj(a,b,c)
+                        h = g;
+                        g = f;
+                        f = e;
+                        e = d + t1;
+                        d = c;
+                        c = b;
+                        b = a;
+                        a = t1 + t2;
+                        t++;
+                    }
+                    {//14
+                        t1 = h +
+                             ((e >> 14) ^ (e << (64 - 14)) ^ (e >> 18) ^ (e << (64 - 18)) ^ (e >> 41) ^ (e << (64 - 41))) +
+                            //Sigma1(e)
+                             ((e & f) ^ (~e & g)) + //Ch(e,f,g)
+                             K[t] + w14;
+                        t2 = ((a >> 28) ^ (a << (64 - 28)) ^ (a >> 34) ^ (a << (64 - 34)) ^ (a >> 39) ^ (a << (64 - 39))) +
+                            //Sigma0(a)
+                             ((a & b) ^ (a & c) ^ (b & c)); //Maj(a,b,c)
+                        h = g;
+                        g = f;
+                        f = e;
+                        e = d + t1;
+                        d = c;
+                        c = b;
+                        b = a;
+                        a = t1 + t2;
+                        t++;
+                    }
+                    {//15
+                        t1 = h +
+                             ((e >> 14) ^ (e << (64 - 14)) ^ (e >> 18) ^ (e << (64 - 18)) ^ (e >> 41) ^ (e << (64 - 41))) +
+                            //Sigma1(e)
+                             ((e & f) ^ (~e & g)) + //Ch(e,f,g)
+                             K[t] + w15;
+                        t2 = ((a >> 28) ^ (a << (64 - 28)) ^ (a >> 34) ^ (a << (64 - 34)) ^ (a >> 39) ^ (a << (64 - 39))) +
+                            //Sigma0(a)
+                             ((a & b) ^ (a & c) ^ (b & c)); //Maj(a,b,c)
+                        h = g;
+                        g = f;
+                        f = e;
+                        e = d + t1;
+                        d = c;
+                        c = b;
+                        b = a;
+                        a = t1 + t2;
+                        t++;
+                    }
+                    if (t == 80)
+                        break;
+
+                    w0 += ((w14 >> 19) ^ (w14 << (64 - 19)) ^ (w14 >> 61) ^ (w14 << (64 - 61)) ^ (w14 >> 6)) +
+                          w9 +
+                          ((w1 >> 1) ^ (w1 << (64 - 1)) ^ (w1 >> 8) ^ (w1 << (64 - 8)) ^ (w1 >> 7));
+                    w1 += ((w15 >> 19) ^ (w15 << (64 - 19)) ^ (w15 >> 61) ^ (w15 << (64 - 61)) ^ (w15 >> 6)) +
+                          w10 +
+                          ((w2 >> 1) ^ (w2 << (64 - 1)) ^ (w2 >> 8) ^ (w2 << (64 - 8)) ^ (w2 >> 7));
+                    w2 += ((w0 >> 19) ^ (w0 << (64 - 19)) ^ (w0 >> 61) ^ (w0 << (64 - 61)) ^ (w0 >> 6)) +
+                          w11 +
+                          ((w3 >> 1) ^ (w3 << (64 - 1)) ^ (w3 >> 8) ^ (w3 << (64 - 8)) ^ (w3 >> 7));
+                    w3 += ((w1 >> 19) ^ (w1 << (64 - 19)) ^ (w1 >> 61) ^ (w1 << (64 - 61)) ^ (w1 >> 6)) +
+                          w12 +
+                          ((w4 >> 1) ^ (w4 << (64 - 1)) ^ (w4 >> 8) ^ (w4 << (64 - 8)) ^ (w4 >> 7));
+                    w4 += ((w2 >> 19) ^ (w2 << (64 - 19)) ^ (w2 >> 61) ^ (w2 << (64 - 61)) ^ (w2 >> 6)) +
+                          w13 +
+                          ((w5 >> 1) ^ (w5 << (64 - 1)) ^ (w5 >> 8) ^ (w5 << (64 - 8)) ^ (w5 >> 7));
+                    w5 += ((w3 >> 19) ^ (w3 << (64 - 19)) ^ (w3 >> 61) ^ (w3 << (64 - 61)) ^ (w3 >> 6)) +
+                          w14 +
+                          ((w6 >> 1) ^ (w6 << (64 - 1)) ^ (w6 >> 8) ^ (w6 << (64 - 8)) ^ (w6 >> 7));
+                    w6 += ((w4 >> 19) ^ (w4 << (64 - 19)) ^ (w4 >> 61) ^ (w4 << (64 - 61)) ^ (w4 >> 6)) +
+                          w15 +
+                          ((w7 >> 1) ^ (w7 << (64 - 1)) ^ (w7 >> 8) ^ (w7 << (64 - 8)) ^ (w7 >> 7));
+                    w7 += ((w5 >> 19) ^ (w5 << (64 - 19)) ^ (w5 >> 61) ^ (w5 << (64 - 61)) ^ (w5 >> 6)) +
+                          w0 +
+                          ((w8 >> 1) ^ (w8 << (64 - 1)) ^ (w8 >> 8) ^ (w8 << (64 - 8)) ^ (w8 >> 7));
+                    w8 += ((w6 >> 19) ^ (w6 << (64 - 19)) ^ (w6 >> 61) ^ (w6 << (64 - 61)) ^ (w6 >> 6)) +
+                          w1 +
+                          ((w9 >> 1) ^ (w9 << (64 - 1)) ^ (w9 >> 8) ^ (w9 << (64 - 8)) ^ (w9 >> 7));
+                    w9 += ((w7 >> 19) ^ (w7 << (64 - 19)) ^ (w7 >> 61) ^ (w7 << (64 - 61)) ^ (w7 >> 6)) +
+                          w2 +
+                          ((w10 >> 1) ^ (w10 << (64 - 1)) ^ (w10 >> 8) ^ (w10 << (64 - 8)) ^ (w10 >> 7));
+                    w10 += ((w8 >> 19) ^ (w8 << (64 - 19)) ^ (w8 >> 61) ^ (w8 << (64 - 61)) ^ (w8 >> 6)) +
+                           w3 +
+                           ((w11 >> 1) ^ (w11 << (64 - 1)) ^ (w11 >> 8) ^ (w11 << (64 - 8)) ^ (w11 >> 7));
+                    w11 += ((w9 >> 19) ^ (w9 << (64 - 19)) ^ (w9 >> 61) ^ (w9 << (64 - 61)) ^ (w9 >> 6)) +
+                           w4 +
+                           ((w12 >> 1) ^ (w12 << (64 - 1)) ^ (w12 >> 8) ^ (w12 << (64 - 8)) ^ (w12 >> 7));
+                    w12 += ((w10 >> 19) ^ (w10 << (64 - 19)) ^ (w10 >> 61) ^ (w10 << (64 - 61)) ^ (w10 >> 6)) +
+                           w5 +
+                           ((w13 >> 1) ^ (w13 << (64 - 1)) ^ (w13 >> 8) ^ (w13 << (64 - 8)) ^ (w13 >> 7));
+                    w13 += ((w11 >> 19) ^ (w11 << (64 - 19)) ^ (w11 >> 61) ^ (w11 << (64 - 61)) ^ (w11 >> 6)) +
+                           w6 +
+                           ((w14 >> 1) ^ (w14 << (64 - 1)) ^ (w14 >> 8) ^ (w14 << (64 - 8)) ^ (w14 >> 7));
+                    w14 += ((w12 >> 19) ^ (w12 << (64 - 19)) ^ (w12 >> 61) ^ (w12 << (64 - 61)) ^ (w12 >> 6)) +
+                           w7 +
+                           ((w15 >> 1) ^ (w15 << (64 - 1)) ^ (w15 >> 8) ^ (w15 << (64 - 8)) ^ (w15 >> 7));
+                    w15 += ((w13 >> 19) ^ (w13 << (64 - 19)) ^ (w13 >> 61) ^ (w13 << (64 - 61)) ^ (w13 >> 6)) +
+                           w8 +
+                           ((w0 >> 1) ^ (w0 << (64 - 1)) ^ (w0 >> 8) ^ (w0 << (64 - 8)) ^ (w0 >> 7));
+                }
+
+                outputState.x0 = inputState.x0 + a;
+                outputState.x1 = inputState.x1 + b;
+                outputState.x2 = inputState.x2 + c;
+                outputState.x3 = inputState.x3 + d;
+                outputState.x4 = inputState.x4 + e;
+                outputState.x5 = inputState.x5 + f;
+                outputState.x6 = inputState.x6 + g;
+                outputState.x7 = inputState.x7 + h;
+            }
+        }
+    }
+}
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/XSalsa20Poly1305.cs b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/XSalsa20Poly1305.cs
new file mode 100644
index 000000000..8e1afeed2
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/XSalsa20Poly1305.cs
@@ -0,0 +1,249 @@
+using System;
+using System.Collections.Generic;
+using Chaos.NaCl.Internal;
+using Chaos.NaCl.Internal.Salsa;
+
+#pragma warning disable CS1591 // Fehledes XML-Kommentar für öffentlich sichtbaren Typ oder Element
+namespace Chaos.NaCl
+{
+    public static class XSalsa20Poly1305
+    {
+        public static readonly int KeySizeInBytes = 32;
+        public static readonly int NonceSizeInBytes = 24;
+        public static readonly int MacSizeInBytes = 16;
+
+        public static byte[] Encrypt(byte[] message, byte[] key, byte[] nonce)
+        {
+            if (message == null)
+                throw new ArgumentNullException("message");
+            if (key == null)
+                throw new ArgumentNullException("key");
+            if (nonce == null)
+                throw new ArgumentNullException("nonce");
+            if (key.Length != KeySizeInBytes)
+                throw new ArgumentException("key.Length != 32");
+            if (nonce.Length != NonceSizeInBytes)
+                throw new ArgumentException("nonce.Length != 24");
+
+            var ciphertext = new byte[message.Length + MacSizeInBytes];
+            EncryptInternal(ciphertext, 0, message, 0, message.Length, key, 0, nonce, 0);
+            return ciphertext;
+        }
+
+        public static void Encrypt(ArraySegment<byte> ciphertext, ArraySegment<byte> message, ArraySegment<byte> key, ArraySegment<byte> nonce)
+        {
+            if (key.Count != KeySizeInBytes)
+                throw new ArgumentException("key.Length != 32");
+            if (nonce.Count != NonceSizeInBytes)
+                throw new ArgumentException("nonce.Length != 24");
+            if (ciphertext.Count != message.Count + MacSizeInBytes)
+                throw new ArgumentException("ciphertext.Count != message.Count + 16");
+            EncryptInternal(ciphertext.Array, ciphertext.Offset, message.Array, message.Offset, message.Count, key.Array, key.Offset, nonce.Array, nonce.Offset);
+        }
+
+        /// <summary>
+        /// Decrypts the ciphertext and verifies its authenticity
+        /// </summary>
+        /// <returns>Plaintext if MAC validation succeeds, null if the data is invalid.</returns>
+        public static byte[] TryDecrypt(byte[] ciphertext, byte[] key, byte[] nonce)
+        {
+            if (ciphertext == null)
+                throw new ArgumentNullException("ciphertext");
+            if (key == null)
+                throw new ArgumentNullException("key");
+            if (nonce == null)
+                throw new ArgumentNullException("nonce");
+            if (key.Length != KeySizeInBytes)
+                throw new ArgumentException("key.Length != 32");
+            if (nonce.Length != NonceSizeInBytes)
+                throw new ArgumentException("nonce.Length != 24");
+
+            if (ciphertext.Length < MacSizeInBytes)
+                return null;
+            var plaintext = new byte[ciphertext.Length - MacSizeInBytes];
+            bool success = DecryptInternal(plaintext, 0, ciphertext, 0, ciphertext.Length, key, 0, nonce, 0);
+            if (success)
+                return plaintext;
+            else
+                return null;
+        }
+
+        /// <summary>
+        /// Decrypts the ciphertext and verifies its authenticity
+        /// </summary>
+        /// <param name="message">Plaintext if authentication succeeded, all zero if authentication failed, unmodified if argument verification fails</param>
+        /// <param name="ciphertext"></param>
+        /// <param name="key">Symmetric key. Must be identical to key specified for encryption.</param>
+        /// <param name="nonce">Must be identical to nonce specified for encryption.</param>
+        /// <returns>true if ciphertext is authentic, false otherwise</returns>
+        public static bool TryDecrypt(ArraySegment<byte> message, ArraySegment<byte> ciphertext, ArraySegment<byte> key, ArraySegment<byte> nonce)
+        {
+            if (key.Count != KeySizeInBytes)
+                throw new ArgumentException("key.Length != 32");
+            if (nonce.Count != NonceSizeInBytes)
+                throw new ArgumentException("nonce.Length != 24");
+            if (ciphertext.Count != message.Count + MacSizeInBytes)
+                throw new ArgumentException("ciphertext.Count != message.Count + 16");
+
+            return DecryptInternal(message.Array, message.Offset, ciphertext.Array, ciphertext.Offset, ciphertext.Count, key.Array, key.Offset, nonce.Array, nonce.Offset);
+        }
+
+        private static void PrepareInternalKey(out Array16<UInt32> internalKey, byte[] key, int keyOffset, byte[] nonce, int nonceOffset)
+        {
+            internalKey.x0 = Salsa20.SalsaConst0;
+            internalKey.x1 = ByteIntegerConverter.LoadLittleEndian32(key, keyOffset + 0);
+            internalKey.x2 = ByteIntegerConverter.LoadLittleEndian32(key, keyOffset + 4);
+            internalKey.x3 = ByteIntegerConverter.LoadLittleEndian32(key, keyOffset + 8);
+            internalKey.x4 = ByteIntegerConverter.LoadLittleEndian32(key, keyOffset + 12);
+            internalKey.x5 = Salsa20.SalsaConst1;
+            internalKey.x6 = ByteIntegerConverter.LoadLittleEndian32(nonce, nonceOffset + 0);
+            internalKey.x7 = ByteIntegerConverter.LoadLittleEndian32(nonce, nonceOffset + 4);
+            internalKey.x8 = ByteIntegerConverter.LoadLittleEndian32(nonce, nonceOffset + 8);
+            internalKey.x9 = ByteIntegerConverter.LoadLittleEndian32(nonce, nonceOffset + 12);
+            internalKey.x10 = Salsa20.SalsaConst2;
+            internalKey.x11 = ByteIntegerConverter.LoadLittleEndian32(key, keyOffset + 16);
+            internalKey.x12 = ByteIntegerConverter.LoadLittleEndian32(key, keyOffset + 20);
+            internalKey.x13 = ByteIntegerConverter.LoadLittleEndian32(key, keyOffset + 24);
+            internalKey.x14 = ByteIntegerConverter.LoadLittleEndian32(key, keyOffset + 28);
+            internalKey.x15 = Salsa20.SalsaConst3;
+            SalsaCore.HSalsa(out internalKey, ref internalKey, 20);
+
+            //key
+            internalKey.x1 = internalKey.x0;
+            internalKey.x2 = internalKey.x5;
+            internalKey.x3 = internalKey.x10;
+            internalKey.x4 = internalKey.x15;
+            internalKey.x11 = internalKey.x6;
+            internalKey.x12 = internalKey.x7;
+            internalKey.x13 = internalKey.x8;
+            internalKey.x14 = internalKey.x9;
+            //const
+            internalKey.x0 = Salsa20.SalsaConst0;
+            internalKey.x5 = Salsa20.SalsaConst1;
+            internalKey.x10 = Salsa20.SalsaConst2;
+            internalKey.x15 = Salsa20.SalsaConst3;
+            //nonce
+            internalKey.x6 = ByteIntegerConverter.LoadLittleEndian32(nonce, nonceOffset + 16);
+            internalKey.x7 = ByteIntegerConverter.LoadLittleEndian32(nonce, nonceOffset + 20);
+            //offset
+            internalKey.x8 = 0;
+            internalKey.x9 = 0;
+        }
+
+        private static bool DecryptInternal(byte[] plaintext, int plaintextOffset, byte[] ciphertext, int ciphertextOffset, int ciphertextLength, byte[] key, int keyOffset, byte[] nonce, int nonceOffset)
+        {
+            int plaintextLength = ciphertextLength - MacSizeInBytes;
+            Array16<UInt32> internalKey;
+            PrepareInternalKey(out internalKey, key, keyOffset, nonce, nonceOffset);
+
+            Array16<UInt32> temp;
+            var tempBytes = new byte[64];//todo: remove allocation
+
+            // first iteration
+            {
+                SalsaCore.Salsa(out temp, ref internalKey, 20);
+
+                //first half is for Poly1305
+                Array8<UInt32> poly1305Key;
+                poly1305Key.x0 = temp.x0;
+                poly1305Key.x1 = temp.x1;
+                poly1305Key.x2 = temp.x2;
+                poly1305Key.x3 = temp.x3;
+                poly1305Key.x4 = temp.x4;
+                poly1305Key.x5 = temp.x5;
+                poly1305Key.x6 = temp.x6;
+                poly1305Key.x7 = temp.x7;
+
+                // compute MAC
+                Poly1305Donna.poly1305_auth(tempBytes, 0, ciphertext, ciphertextOffset + 16, plaintextLength, ref poly1305Key);
+                if (!CryptoBytes.ConstantTimeEquals(tempBytes, 0, ciphertext, ciphertextOffset, MacSizeInBytes))
+                {
+                    Array.Clear(plaintext, plaintextOffset, plaintextLength);
+                    return false;
+                }
+
+                // rest for the message
+                ByteIntegerConverter.StoreLittleEndian32(tempBytes, 0, temp.x8);
+                ByteIntegerConverter.StoreLittleEndian32(tempBytes, 4, temp.x9);
+                ByteIntegerConverter.StoreLittleEndian32(tempBytes, 8, temp.x10);
+                ByteIntegerConverter.StoreLittleEndian32(tempBytes, 12, temp.x11);
+                ByteIntegerConverter.StoreLittleEndian32(tempBytes, 16, temp.x12);
+                ByteIntegerConverter.StoreLittleEndian32(tempBytes, 20, temp.x13);
+                ByteIntegerConverter.StoreLittleEndian32(tempBytes, 24, temp.x14);
+                ByteIntegerConverter.StoreLittleEndian32(tempBytes, 28, temp.x15);
+                int count = Math.Min(32, plaintextLength);
+                for (int i = 0; i < count; i++)
+                    plaintext[plaintextOffset + i] = (byte)(ciphertext[MacSizeInBytes + ciphertextOffset + i] ^ tempBytes[i]);
+            }
+
+            // later iterations
+            int blockOffset = 32;
+            while (blockOffset < plaintextLength)
+            {
+                internalKey.x8++;
+                SalsaCore.Salsa(out temp, ref internalKey, 20);
+                ByteIntegerConverter.Array16StoreLittleEndian32(tempBytes, 0, ref temp);
+                int count = Math.Min(64, plaintextLength - blockOffset);
+                for (int i = 0; i < count; i++)
+                    plaintext[plaintextOffset + blockOffset + i] = (byte)(ciphertext[16 + ciphertextOffset + blockOffset + i] ^ tempBytes[i]);
+                blockOffset += 64;
+            }
+            return true;
+        }
+
+        private static void EncryptInternal(byte[] ciphertext, int ciphertextOffset, byte[] message, int messageOffset, int messageLength, byte[] key, int keyOffset, byte[] nonce, int nonceOffset)
+        {
+            Array16<UInt32> internalKey;
+            PrepareInternalKey(out internalKey, key, keyOffset, nonce, nonceOffset);
+
+            Array16<UInt32> temp;
+            var tempBytes = new byte[64];//todo: remove allocation
+            Array8<UInt32> poly1305Key;
+
+            // first iteration
+            {
+                SalsaCore.Salsa(out temp, ref internalKey, 20);
+
+                //first half is for Poly1305
+                poly1305Key.x0 = temp.x0;
+                poly1305Key.x1 = temp.x1;
+                poly1305Key.x2 = temp.x2;
+                poly1305Key.x3 = temp.x3;
+                poly1305Key.x4 = temp.x4;
+                poly1305Key.x5 = temp.x5;
+                poly1305Key.x6 = temp.x6;
+                poly1305Key.x7 = temp.x7;
+
+                // second half for the message
+                ByteIntegerConverter.StoreLittleEndian32(tempBytes, 0, temp.x8);
+                ByteIntegerConverter.StoreLittleEndian32(tempBytes, 4, temp.x9);
+                ByteIntegerConverter.StoreLittleEndian32(tempBytes, 8, temp.x10);
+                ByteIntegerConverter.StoreLittleEndian32(tempBytes, 12, temp.x11);
+                ByteIntegerConverter.StoreLittleEndian32(tempBytes, 16, temp.x12);
+                ByteIntegerConverter.StoreLittleEndian32(tempBytes, 20, temp.x13);
+                ByteIntegerConverter.StoreLittleEndian32(tempBytes, 24, temp.x14);
+                ByteIntegerConverter.StoreLittleEndian32(tempBytes, 28, temp.x15);
+                int count = Math.Min(32, messageLength);
+                for (int i = 0; i < count; i++)
+                    ciphertext[16 + ciphertextOffset + i] = (byte)(message[messageOffset + i] ^ tempBytes[i]);
+            }
+
+            // later iterations
+            int blockOffset = 32;
+            while (blockOffset < messageLength)
+            {
+                internalKey.x8++;
+                SalsaCore.Salsa(out temp, ref internalKey, 20);
+                ByteIntegerConverter.Array16StoreLittleEndian32(tempBytes, 0, ref temp);
+                int count = Math.Min(64, messageLength - blockOffset);
+                for (int i = 0; i < count; i++)
+                    ciphertext[16 + ciphertextOffset + blockOffset + i] = (byte)(message[messageOffset + blockOffset + i] ^ tempBytes[i]);
+                blockOffset += 64;
+            }
+
+            // compute MAC
+            Poly1305Donna.poly1305_auth(ciphertext, ciphertextOffset, ciphertext, ciphertextOffset + 16, messageLength, ref poly1305Key);
+        }
+    }
+}
+#pragma warning restore CS1591 // Fehledes XML-Kommentar für öffentlich sichtbaren Typ oder Element
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/readme.md b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/readme.md
new file mode 100644
index 000000000..dcecc0dfb
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/Ciphers/Ed255129/readme.md
@@ -0,0 +1,158 @@
+Chaos.NaCl
+==========
+
+Chaos.NaCl is a cryptography library written in C#. It is based on djb's NaCl.
+
+Currently it supports:
+
+* Ed25519 signatures
+* Key-exchange using either Curve25519 (montgomery form) or Ed25519 public keys
+* Authenticated encryption using XSalsa20Poly1305
+* Hashing using SHA-512
+
+Most functions come in two variants:
+
+* An easy to use variant, where inputs are complete byte arrays and results are
+  returned in newly allocated arrays. 
+* An advanced variant which uses `ArraySegment<byte>` to work on slices of the
+  passed in arrays. This can be used to avoid unnecessary allocations and copies.
+
+**WARNINGS:**
+
+* The current API is not final. I'll probably modify it.
+* Some functions are marked with the `[Obsolete("Needs more testing")]` attribute.
+  Those should work in principle, but I'm not happy with the unit test coverage.
+
+`Ed25519` (Key-exchange and signatures)
+===========================
+
+Ed25519 is a public key crypto system with a 128 bit security level.
+It is based on the 255 bit elliptic curve Curve25519 using Edwards coordinates.
+
+Data structures
+---------------
+
+* *Public Keys* are 32 byte values. All possible values of this size a valid.
+* *Private Keys* take two forms:
+
+    * A 32 byte seeds which allow arbitrary values. This is the form that should be generated and stored.
+    * A 64 byte expanded form. This forms is used internally to improve performance
+
+* *Signatures* are 64 byte values
+
+To generate a keypair first obtain a 32 byte random value, the `privateKeySeed`
+from a cryptographic random number generator, such as `RNGCryptoService`.
+
+Then call `KeyPairFromSeed` on it to get the `publicKey` and the `expandedPrivateKey`.
+
+API
+---
+
+    public static byte[] PublicKeyFromSeed(byte[] privateKeySeed)
+
+Returns the 32 byte public key corresponding the given `privateKeySeed`.
+
+    public static byte[] ExpandedPrivateKeyFromSeed(byte[] privateKeySeed)
+
+Expands the `privateKeySeed` into the form used by the `Sign` function.
+
+    public static void KeyPairFromSeed(out byte[] publicKey, out byte[] expandedPrivateKey, byte[] privateKeySeed)
+
+Equivalent to calling both `PublicKeyFromSeed` and `ExpandedPrivateKeyFromSeed`.
+
+Using this function is twice as fast as calling them individually.
+
+    public static byte[] Sign(byte[] message, byte[] expandedPrivateKey)
+
+Returns the 64 byte signature for `message` using the given private key. The signature
+can be verified using `Verify` with the corresponding public key.
+
+    public static bool Verify(byte[] signature, byte[] message, byte[] publicKey)
+
+Verifies if `signature` was produced by signing `message` using the private key
+corresponding to `publicKey`.
+
+Returns `true` if the signature is valid, `false` if it is not.
+
+    public static byte[] KeyExchange(byte[] publicKey, byte[] privateKey)
+
+Returns a secred shared by the owners of the two keys pairs. This key can be used
+with symmetric cryptography, such as encryption, MACs and authenticated encryption.
+
+This uses Edwards form public keys, but is otherwise identical to `MontgomeryCurve25519.KeyExchange`.
+The advantage of this method is that you can use one keypair for both key-exchange and signing.
+
+Performance
+-----------
+
+On a single core of my Intel Core i3 M390 with 2.66 GHz I obtain:
+
+    Key generation:             116.68 us / 8571 per second / 310356 cycles
+    Signing a short message:    122.46 us / 8166 per second / 325746 cycles
+    Verifying a short message:  279.18 us / 3582 per second / 742607 cycles
+
+This is about 1.4 times as slow as the equivalent c code.
+
+`MontgomeryCurve25519` - Key-exchange using Curve25519 in montgomery form
+=========================================================================
+
+Compatible with NaCl's `crypto_box_beforenm`
+
+`XSalsa20Poly1305` - Authenticates encryption using XSalsa20 as cipher and Poly1305 as MAC
+==========================================================================================
+
+Compatible with NaCl's `crypto_secret_box` and `crypto_box_afternm`.
+
+
+CryptoBytes
+===========
+
+Contains helper functions commonly used in cryptographic code.
+
+    void Wipe(byte[] data)
+
+Overwrites the contents of the array, wiping the previous content. This should be used
+to destroy cryptographic secrets that are no longer required.
+
+Complicating factors like swap files, crash dumps and the moving garbage collector
+reduce the reliability of this function.
+
+    public static bool ContantTimeEquals(byte[] x, byte[] y)
+
+Checks if the contents of the two arrays are the same and returns `truie` if they are equal.  
+Throws an expection if their lengthes differ.
+
+The runtime of this method does not depend on the contents of the arrays. Using constant time
+prevents timing attacks that allow an attacker to learn if the arrays have a common prefix.
+It is important to use such a constant time comparison when verifying MACs.
+
+    public static string ToHexString(byte[] data)
+
+Converts the bytes to an upper-case hex string.
+
+*constant time*
+
+    public static string ToHexStringLower(byte[] data)
+
+Converts the bytes to a lower-case hex string.
+
+*constant time*
+
+    public static byte[] FromHexString(string hexString)
+
+Converts the hex string to bytes. Case insensitive.
+
+*variable time*
+
+    public static string ToBase64String(byte[] data)
+
+Encodes the bytes with the Base64 encoding. More compact than hex, but it is case-sensitive
+and uses the special characters `+`, `/` and `=`.
+
+*variable time*
+
+    public static byte[] FromBase64String(string s)
+
+Decodes a Base64 encoded string back to bytes.
+
+*variable time*
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/ED25519DigitalSignature.cs b/src/Renci.SshNet/Security/Cryptography/ED25519DigitalSignature.cs
new file mode 100644
index 000000000..1000e904a
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/ED25519DigitalSignature.cs
@@ -0,0 +1,93 @@
+using System;
+using Renci.SshNet.Common;
+using Chaos.NaCl;
+
+namespace Renci.SshNet.Security.Cryptography
+{
+    /// <summary>
+    /// Implements ECDSA digital signature algorithm.
+    /// </summary>
+    public class ED25519DigitalSignature : DigitalSignature, IDisposable
+    {
+        private readonly ED25519Key _key;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="ED25519DigitalSignature" /> class.
+        /// </summary>
+        /// <param name="key">The ED25519Key key.</param>
+        /// <exception cref="ArgumentNullException"><paramref name="key"/> is <c>null</c>.</exception>
+        public ED25519DigitalSignature(ED25519Key key)
+        {
+            if (key == null)
+                throw new ArgumentNullException("key");
+
+            _key = key;
+        }
+
+        /// <summary>
+        /// Verifies the signature.
+        /// </summary>
+        /// <param name="input">The input.</param>
+        /// <param name="signature">The signature.</param>
+        /// <returns>
+        /// <c>true</c> if signature was successfully verified; otherwise <c>false</c>.
+        /// </returns>
+        /// <exception cref="InvalidOperationException">Invalid signature.</exception>
+        public override bool Verify(byte[] input, byte[] signature)
+        {
+            return Ed25519.Verify(signature, input, _key.PublicKey);
+        }
+
+        /// <summary>
+        /// Creates the signature.
+        /// </summary>
+        /// <param name="input">The input.</param>
+        /// <returns>
+        /// Signed input data.
+        /// </returns>
+        /// <exception cref="SshException">Invalid ED25519Key key.</exception>
+        public override byte[] Sign(byte[] input)
+        {
+            return Ed25519.Sign(input, _key.PrivateKey);
+        }
+
+        #region IDisposable Members
+
+        private bool _isDisposed;
+
+        /// <summary>
+        /// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
+        /// </summary>
+        public void Dispose()
+        {
+            Dispose(true);
+            GC.SuppressFinalize(this);
+        }
+
+        /// <summary>
+        /// Releases unmanaged and - optionally - managed resources
+        /// </summary>
+        /// <param name="disposing"><c>true</c> to release both managed and unmanaged resources; <c>false</c> to release only unmanaged resources.</param>
+        protected virtual void Dispose(bool disposing)
+        {
+            if (_isDisposed)
+                return;
+
+            if (disposing)
+            {
+                _isDisposed = true;
+            }
+        }
+
+        /// <summary>
+        /// Releases unmanaged resources and performs other cleanup operations before the
+        /// <see cref="ED25519DigitalSignature"/> is reclaimed by garbage collection.
+        /// </summary>
+        ~ED25519DigitalSignature()
+        {
+            Dispose(false);
+        }
+
+        #endregion
+    }
+}
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/ED25519Key.cs b/src/Renci.SshNet/Security/Cryptography/ED25519Key.cs
new file mode 100644
index 000000000..8e765d1a5
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/ED25519Key.cs
@@ -0,0 +1,159 @@
+using System;
+using Chaos.NaCl;
+using Renci.SshNet.Common;
+using Renci.SshNet.Security.Cryptography;
+
+namespace Renci.SshNet.Security
+{
+    /// <summary>
+    /// Contains ED25519 private and public key
+    /// </summary>
+    public class ED25519Key : Key, IDisposable
+    {
+        private ED25519DigitalSignature _digitalSignature;
+
+        private byte[] SK;
+        private byte[] PK;
+        private byte[] publicKey = new byte[Ed25519.PublicKeySizeInBytes];
+        private byte[] privateKey = new byte[Ed25519.ExpandedPrivateKeySizeInBytes];
+
+        /// <summary>
+        /// Gets the Key String.
+        /// </summary>
+        public override string ToString()
+        {
+            return "ssh-ed25519";
+        }
+
+        /// <summary>
+        /// Gets or sets the public.
+        /// </summary>
+        /// <value>
+        /// The public.
+        /// </value>
+        public override BigInteger[] Public
+        {
+            get
+            {
+                if (PK != null)
+                    return new BigInteger[] { new BigInteger(PK) };
+                return new BigInteger[] { new BigInteger(publicKey) };
+            }
+            set
+            {
+                publicKey = value[0].ToByteArray().Reverse();
+            }
+        }
+
+        /// <summary>
+        /// Gets the length of the key.
+        /// </summary>
+        /// <value>
+        /// The length of the key.
+        /// </value>
+        public override int KeyLength
+        {
+            get
+            {
+                return publicKey.Length;
+            }
+        }
+
+        /// <summary>
+        /// Gets the digital signature.
+        /// </summary>
+        protected override DigitalSignature DigitalSignature
+        {
+            get
+            {
+                if (_digitalSignature == null)
+                {
+                    _digitalSignature = new ED25519DigitalSignature(this);
+                }
+                return _digitalSignature;
+            }
+        }
+
+        /// <summary>
+        /// Gets the PublicKey Bytes
+        /// </summary>
+        public byte[] PublicKey
+        {
+            get
+            {
+                return publicKey;
+            }
+        }
+
+        /// <summary>
+        /// Gets the PrivateKey Bytes
+        /// </summary>
+        public byte[] PrivateKey
+        {
+            get
+            {
+                return privateKey;
+            }
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="ED25519Key"/> class.
+        /// </summary>
+        public ED25519Key()
+        {
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="ED25519Key"/> class.
+        /// </summary>
+        /// <param name="pk">pk data.</param>
+        /// <param name="sk">sk data.</param>
+        public ED25519Key(byte[] pk, byte[] sk)
+        {
+            PK = pk;
+            SK = sk;
+            var seed = new byte[Ed25519.PrivateKeySeedSizeInBytes];
+            Buffer.BlockCopy(sk, 0, seed, 0, seed.Length);
+            Ed25519.KeyPairFromSeed(out publicKey, out privateKey, seed);
+        }
+
+        #region IDisposable Members
+
+        private bool _isDisposed;
+
+        /// <summary>
+        /// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
+        /// </summary>
+        public void Dispose()
+        {
+            Dispose(true);
+            GC.SuppressFinalize(this);
+        }
+
+        /// <summary>
+        /// Releases unmanaged and - optionally - managed resources
+        /// </summary>
+        /// <param name="disposing"><c>true</c> to release both managed and unmanaged resources; <c>false</c> to release only unmanaged resources.</param>
+        protected virtual void Dispose(bool disposing)
+        {
+            if (_isDisposed)
+                return;
+
+            if (disposing)
+            {
+                _isDisposed = true;
+            }
+        }
+
+        /// <summary>
+        /// Releases unmanaged resources and performs other cleanup operations before the
+        /// <see cref="DsaKey"/> is reclaimed by garbage collection.
+        /// </summary>
+        ~ED25519Key()
+        {
+            Dispose(false);
+        }
+
+        #endregion
+    }
+}
diff --git a/src/Renci.SshNet/Security/Cryptography/EcdsaDigitalSignature.cs b/src/Renci.SshNet/Security/Cryptography/EcdsaDigitalSignature.cs
new file mode 100644
index 000000000..c6386b180
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/EcdsaDigitalSignature.cs
@@ -0,0 +1,197 @@
+#if FEATURE_ECDSA
+using System;
+using Renci.SshNet.Common;
+using System.Globalization;
+
+namespace Renci.SshNet.Security.Cryptography
+{
+    /// <summary>
+    /// Implements ECDSA digital signature algorithm.
+    /// </summary>
+    public class EcdsaDigitalSignature : DigitalSignature, IDisposable
+    {
+        private readonly EcdsaKey _key;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="EcdsaDigitalSignature" /> class.
+        /// </summary>
+        /// <param name="key">The ECDSA key.</param>
+        /// <exception cref="ArgumentNullException"><paramref name="key"/> is <c>null</c>.</exception>
+        public EcdsaDigitalSignature(EcdsaKey key)
+        {
+            if (key == null)
+                throw new ArgumentNullException("key");
+
+            _key = key;
+        }
+
+        /// <summary>
+        /// Verifies the signature.
+        /// </summary>
+        /// <param name="input">The input.</param>
+        /// <param name="signature">The signature.</param>
+        /// <returns>
+        /// <c>true</c> if signature was successfully verified; otherwise <c>false</c>.
+        /// </returns>
+        public override bool Verify(byte[] input, byte[] signature)
+        {
+            // for 521 sig_size is 132
+            var sig_size = _key.dsa.KeySize == 521 ? 132 : _key.dsa.KeySize / 4;
+            var ssh_data = new SshDataSignature(signature, sig_size);
+            return _key.dsa.VerifyData(input, ssh_data.Signature);
+        }
+
+        /// <summary>
+        /// Creates the signature.
+        /// </summary>
+        /// <param name="input">The input.</param>
+        /// <returns>
+        /// Signed input data.
+        /// </returns>
+        public override byte[] Sign(byte[] input)
+        {
+            var signed = _key.dsa.SignData(input);
+            var ssh_data = new SshDataSignature(signed.Length);
+            ssh_data.Signature = signed;
+            return ssh_data.GetBytes();
+        }
+
+        #region IDisposable Members
+
+        private bool _isDisposed;
+
+        /// <summary>
+        /// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
+        /// </summary>
+        public void Dispose()
+        {
+            Dispose(true);
+            GC.SuppressFinalize(this);
+        }
+
+        /// <summary>
+        /// Releases unmanaged and - optionally - managed resources
+        /// </summary>
+        /// <param name="disposing"><c>true</c> to release both managed and unmanaged resources; <c>false</c> to release only unmanaged resources.</param>
+        protected virtual void Dispose(bool disposing)
+        {
+            if (_isDisposed)
+                return;
+
+            if (disposing)
+            {
+                _isDisposed = true;
+            }
+        }
+
+        /// <summary>
+        /// Releases unmanaged resources and performs other cleanup operations before the
+        /// <see cref="EcdsaDigitalSignature"/> is reclaimed by garbage collection.
+        /// </summary>
+        ~EcdsaDigitalSignature()
+        {
+            Dispose(false);
+        }
+
+        #endregion
+    }
+
+    class SshDataSignature : SshData
+    {
+        private int _signature_size;
+
+        private byte[] _signature_r;
+        private byte[] _signature_s;
+
+        public byte[] Signature
+        {
+            get
+            {
+                var signature = new byte[_signature_size];
+                Buffer.BlockCopy(_signature_r, 0, signature, 0, _signature_r.Length);
+                Buffer.BlockCopy(_signature_s, 0, signature, _signature_r.Length, _signature_s.Length);
+                return signature;
+            }
+            set
+            {
+                var signed_r = new byte[_signature_size / 2];
+                Buffer.BlockCopy(value, 0, signed_r, 0, signed_r.Length);
+                _signature_r = BytesToSsh(signed_r);
+
+                var signed_s = new byte[_signature_size / 2];
+                Buffer.BlockCopy(value, signed_r.Length, signed_s, 0, signed_s.Length);
+                _signature_s = BytesToSsh(signed_s);
+            }
+        }
+
+        public SshDataSignature(int sig_size)
+        {
+            _signature_size = sig_size;
+        }
+
+        public SshDataSignature(byte[] data, int sig_size)
+        {
+            _signature_size = sig_size;
+            Load(data);
+        }
+
+        protected override void LoadData()
+        {
+            _signature_r = Padded(ReadBinary().TrimLeadingZeros(), _signature_size / 2);
+            _signature_s = Padded(ReadBinary().TrimLeadingZeros(), _signature_size / 2);
+        }
+
+        protected override void SaveData()
+        {
+            WriteBinaryString(BytesToSsh(_signature_r));
+            WriteBinaryString(BytesToSsh(_signature_s));
+        }
+
+        public new byte[] ReadBinary()
+        {
+            var length = ReadUInt32();
+
+            if (length > int.MaxValue)
+            {
+                throw new NotSupportedException(string.Format(CultureInfo.CurrentCulture, "Strings longer than {0} is not supported.", int.MaxValue));
+            }
+
+            return ReadBytes((int)length);
+        }
+
+        protected override int BufferCapacity
+        {
+            get
+            {
+                var capacity = base.BufferCapacity;
+                capacity += 4; // r length
+                capacity += _signature_r.Length; // signature r
+                capacity += 4; // s length
+                capacity += _signature_s.Length; // signature s
+                return capacity;
+            }
+        }
+
+        // Fill Data with Leading-Zeros if neccesary
+        private byte[] Padded(byte[] data, int length)
+        {
+            if (length <= data.Length)
+                return data;
+            var new_data = new byte[length];
+            Buffer.BlockCopy(data, 0, new_data, new_data.Length - data.Length, data.Length);
+            return new_data;
+        }
+
+        // Prepend a 0-Byte if neccesary
+        private byte[] BytesToSsh(byte[] data)
+        {
+            if ((data[0] & (1 << 7)) != 0) {
+                var buf = new byte[data.Length + 1];
+                Buffer.BlockCopy(data, 0, buf, 1, data.Length);
+                return buf;
+            }
+            return data;
+        }
+    }
+}
+#endif
\ No newline at end of file
diff --git a/src/Renci.SshNet/Security/Cryptography/EcdsaKey.cs b/src/Renci.SshNet/Security/Cryptography/EcdsaKey.cs
new file mode 100644
index 000000000..03ac93175
--- /dev/null
+++ b/src/Renci.SshNet/Security/Cryptography/EcdsaKey.cs
@@ -0,0 +1,362 @@
+#if FEATURE_ECDSA
+using System;
+using System.IO;
+using System.Text;
+using System.Runtime.InteropServices;
+using System.Security.Cryptography;
+using Renci.SshNet.Common;
+using Renci.SshNet.Security.Cryptography;
+
+namespace Renci.SshNet.Security
+{
+    /// <summary>
+    /// Contains ECDSA (ecdsa-sha2-nistp{256,384,521}) private and public key
+    /// </summary>
+    public class EcdsaKey : Key, IDisposable
+    {
+        internal enum KeyBlobMagicNumber : int
+        {
+            BCRYPT_ECDSA_PUBLIC_P256_MAGIC = 0x31534345,
+            BCRYPT_ECDSA_PRIVATE_P256_MAGIC = 0x32534345,
+            BCRYPT_ECDSA_PUBLIC_P384_MAGIC = 0x33534345,
+            BCRYPT_ECDSA_PRIVATE_P384_MAGIC = 0x34534345,
+            BCRYPT_ECDSA_PUBLIC_P521_MAGIC = 0x35534345,
+            BCRYPT_ECDSA_PRIVATE_P521_MAGIC = 0x36534345,
+
+            BCRYPT_ECDH_PUBLIC_P256_MAGIC = 0x314B4345,
+            BCRYPT_ECDH_PRIVATE_P256_MAGIC = 0x324B4345,
+            BCRYPT_ECDH_PUBLIC_P384_MAGIC = 0x334B4345,
+            BCRYPT_ECDH_PRIVATE_P384_MAGIC = 0x344B4345,
+            BCRYPT_ECDH_PUBLIC_P521_MAGIC = 0x354B4345,
+            BCRYPT_ECDH_PRIVATE_P521_MAGIC = 0x364B4345,
+
+            BCRYPT_ECDH_PUBLIC_GENERIC_MAGIC = 0x504B4345,
+            BCRYPT_ECDH_PRIVATE_GENERIC_MAGIC = 0x564B4345,
+        }
+
+        [StructLayout(LayoutKind.Sequential)]
+        internal struct BCRYPT_ECCKEY_BLOB
+        {
+            internal KeyBlobMagicNumber Magic;
+            internal int cbKey;
+        }
+
+        /// <summary>
+        /// Gets dsa
+        /// </summary>
+        public ECDsaCng dsa;
+
+        private CngKey key;
+
+        /// <summary>
+        /// Gets the SSH name of the ECDSA Key
+        /// </summary>
+        public override string ToString()
+        {
+            return string.Format("ecdsa-sha2-nistp{0}", KeyLength);
+        }
+
+        /// <summary>
+        /// Gets the length of the key.
+        /// </summary>
+        /// <value>
+        /// The length of the key.
+        /// </value>
+        public override int KeyLength
+        {
+            get
+            {
+                return key.KeySize;
+            }
+        }
+
+        /// <summary>
+        /// Gets the digital signature.
+        /// </summary>
+        protected override DigitalSignature DigitalSignature
+        {
+            get
+            {
+                if (_digitalSignature == null)
+                {
+                    _digitalSignature = new EcdsaDigitalSignature(this);
+                }
+                return _digitalSignature;
+            }
+        }
+
+        /// <summary>
+        /// Gets or sets the public.
+        /// </summary>
+        /// <value>
+        /// The public.
+        /// </value>
+        public override BigInteger[] Public
+        {
+            get
+            {
+                var blob = key.Export(CngKeyBlobFormat.EccPublicBlob);
+
+                byte[] qx;
+                byte[] qy;
+                KeyBlobMagicNumber magic;
+                using (var br = new BinaryReader(new MemoryStream(blob)))
+                {
+                    magic = (KeyBlobMagicNumber)br.ReadInt32();
+                    int cbKey = br.ReadInt32();
+                    qx = br.ReadBytes(cbKey);
+                    qy = br.ReadBytes(cbKey);
+                }
+
+                string curve = "";
+                switch (magic)
+                {
+                    case KeyBlobMagicNumber.BCRYPT_ECDSA_PUBLIC_P256_MAGIC:
+                        curve = "nistp256";
+                        break;
+                    case KeyBlobMagicNumber.BCRYPT_ECDSA_PUBLIC_P384_MAGIC:
+                        curve = "nistp384";
+                        break;
+                    case KeyBlobMagicNumber.BCRYPT_ECDSA_PUBLIC_P521_MAGIC:
+                        curve = "nistp521";
+                        break;
+                    default:
+                        throw new SshException("Unexpected Curve Magic: " + magic);
+                }
+                var curve_bn = new BigInteger(Encoding.ASCII.GetBytes(curve).Reverse());
+
+                // Make ECPoint from x and y
+                // Prepend 04 (uncompressed format) + qx-bytes + qy-bytes
+                var point_bn_bytes = new byte[1 + qx.Length + qy.Length];
+                Buffer.SetByte(point_bn_bytes, 0, 4);
+                Buffer.BlockCopy(qx, 0, point_bn_bytes, 1, qx.Length);
+                Buffer.BlockCopy(qy, 0, point_bn_bytes, qx.Length + 1, qy.Length);
+
+                // returns Curve-Name and x/y as ECPoint
+                return new[] { curve_bn, new BigInteger(point_bn_bytes.Reverse()) };
+            }
+            set
+            {
+                // value[0]:
+                // Curve Name as String
+                // nistp{256,384,521}
+                var value_0 = Encoding.ASCII.GetString(value[0].ToByteArray().Reverse()); // Curve Name as String
+
+                var curve_magic = KeyBlobMagicNumber.BCRYPT_ECDH_PRIVATE_GENERIC_MAGIC;
+                var hash_algo = CngAlgorithm.Sha256;
+                switch (value_0)
+                {
+                    case "nistp256":
+                        curve_magic = KeyBlobMagicNumber.BCRYPT_ECDSA_PUBLIC_P256_MAGIC;
+                        hash_algo = CngAlgorithm.Sha256;
+                        break;
+                    case "nistp384":
+                        curve_magic = KeyBlobMagicNumber.BCRYPT_ECDSA_PUBLIC_P384_MAGIC;
+                        hash_algo = CngAlgorithm.Sha384;
+                        break;
+                    case "nistp521":
+                        curve_magic = KeyBlobMagicNumber.BCRYPT_ECDSA_PUBLIC_P521_MAGIC;
+                        hash_algo = CngAlgorithm.Sha512;
+                        break;
+                    default:
+                        throw new SshException("Unexpected Curve Name: " + value_0);
+                }
+
+                // ECPoint as BigInteger(2)
+                var value_1 = value[1].ToByteArray().Reverse();
+
+                var cord_size = (value_1.Length - 1) / 2;
+                var value_1_x = new byte[cord_size];
+                Buffer.BlockCopy(value_1, 1, value_1_x, 0, value_1_x.Length); // first byte is format. should be checked?
+                var value_1_x_bn = new BigInteger(value_1_x);
+
+                var value_1_y = new byte[cord_size];
+                Buffer.BlockCopy(value_1, cord_size + 1, value_1_y, 0, value_1_y.Length);
+                var value_1_y_bn = new BigInteger(value_1_y);
+
+                int headerSize = Marshal.SizeOf(typeof(BCRYPT_ECCKEY_BLOB));
+                int blobSize = headerSize + (2 * cord_size);
+                byte[] blob = new byte[blobSize];
+
+                using (var bw = new BinaryWriter(new MemoryStream(blob)))
+                {
+                    bw.Write((int)curve_magic);
+                    bw.Write(cord_size);
+                    bw.Write(value_1_x_bn.ToByteArray()); // q.x
+                    bw.Write(value_1_y_bn.ToByteArray()); // q.y
+                }
+                key = CngKey.Import(blob, CngKeyBlobFormat.EccPublicBlob);
+                dsa = new ECDsaCng(key)
+                {
+                    HashAlgorithm = hash_algo
+                };
+            }
+        }
+
+        private EcdsaDigitalSignature _digitalSignature;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="EcdsaKey"/> class.
+        /// </summary>
+        public EcdsaKey()
+        {
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="EcdsaKey"/> class.
+        /// </summary>
+        /// <param name="data">DER encoded private key data.</param>
+        public EcdsaKey(byte[] data)
+        {
+            var der = new DerData(data);
+            var version = der.ReadBigInteger(); // skip version
+
+            // PrivateKey
+            var privatekey = der.ReadOctetString();
+
+            // Construct
+            var s0 = der.ReadByte();
+            if ((s0 & 0xe0) != 0xa0)
+                throw new SshException(string.Format("UnexpectedDER: wanted constructed tag (0xa0-0xbf), got: {0:X}", s0));
+            var tag = s0 & 0x1f;
+            if (tag != 0)
+                throw new SshException(string.Format("expected tag 0 in DER privkey, got: {0}", tag));
+            der.ReadByte(); // object length
+
+            // curve OID
+            var curve = der.ReadObject();
+
+            var pkcs8_data = PemToPkcs8(privatekey, curve, true);
+            key = ImportPkcs8(pkcs8_data, privatekey);
+            dsa = new ECDsaCng(key);
+
+            switch (dsa.KeySize)
+            {
+                case 256:
+                    dsa.HashAlgorithm = CngAlgorithm.Sha256;
+                    break;
+                case 384:
+                    dsa.HashAlgorithm = CngAlgorithm.Sha384;
+                    break;
+                case 521:
+                    dsa.HashAlgorithm = CngAlgorithm.Sha512;
+                    break;
+                default:
+                    throw new SshException("Unknown KeySize: " + dsa.KeySize);
+            }
+        }
+
+        private CngKey ImportPkcs8(byte[] pkcs8_data, byte[] privatekey)
+        {
+            // There was an issue in older .NET Versions which prevents
+            // the usage our keys. Was fixed with .NET 4.6.1. Workaround:
+            // Change KeyBlobMagicNumber from Key-exchange (ECDH) to Signing (ECDSA)
+            // See: https://stackoverflow.com/a/43982666
+            var key =CngKey.Import(pkcs8_data, CngKeyBlobFormat.Pkcs8PrivateBlob);
+
+            var blob = key.Export(CngKeyBlobFormat.EccPublicBlob);
+            key.Dispose();
+            byte[] qx;
+            byte[] qy;
+            KeyBlobMagicNumber magic;
+            int cbkey;
+            using (var br = new BinaryReader(new MemoryStream(blob)))
+            {
+                magic = (KeyBlobMagicNumber)br.ReadInt32();
+                cbkey = br.ReadInt32();
+                qx = br.ReadBytes(cbkey);
+                qy = br.ReadBytes(cbkey);
+            }
+
+            switch (magic)
+            {
+                case KeyBlobMagicNumber.BCRYPT_ECDH_PUBLIC_P256_MAGIC:
+                    magic = KeyBlobMagicNumber.BCRYPT_ECDSA_PRIVATE_P256_MAGIC;
+                    break;
+                case KeyBlobMagicNumber.BCRYPT_ECDH_PUBLIC_P384_MAGIC:
+                    magic = KeyBlobMagicNumber.BCRYPT_ECDSA_PRIVATE_P384_MAGIC;
+                    break;
+                case KeyBlobMagicNumber.BCRYPT_ECDH_PUBLIC_P521_MAGIC:
+                    magic = KeyBlobMagicNumber.BCRYPT_ECDSA_PRIVATE_P521_MAGIC;
+                    break;
+            }
+
+            int headerSize = Marshal.SizeOf(typeof(BCRYPT_ECCKEY_BLOB));
+            int blobSize = headerSize + qx.Length + qy.Length + privatekey.Length;
+            byte[] new_blob = new byte[blobSize];
+
+            using (var bw = new BinaryWriter(new MemoryStream(new_blob)))
+            {
+                bw.Write((int)magic);
+                bw.Write(cbkey);
+                bw.Write(qx); // q.x
+                bw.Write(qy); // q.y
+                bw.Write(privatekey); // d
+            }
+            return CngKey.Import(new_blob, CngKeyBlobFormat.EccPrivateBlob);
+        }
+
+        // Since Windows Crypto API is unable to parse/read our PEM format directly
+        // we have to convert it to PKCS#8 Format first
+        private byte[] PemToPkcs8(byte[] key, byte[] curve, bool isprivate)
+        {
+            var newdata = new DerData();
+            newdata.Write(new BigInteger(0));
+
+            // Create Infos about Content and our Curve
+            var objdata = new DerData();
+            // 1.2.840.10045.2.1 - ECDSA and ECDH Public Key.
+            var obj = new ObjectIdentifier(1, 2, 840, 10045, 2, 1);
+            objdata.Write(obj);
+            objdata.WriteObjectIdentifier(curve);
+            newdata.WriteBytes(objdata.Encode());
+
+            var keydata = new DerData();
+            keydata.Write(new BigInteger(isprivate ? 1: 0));
+            keydata.Write(key);
+
+            newdata.Write(keydata.Encode());
+
+            return newdata.Encode();
+        }
+        #region IDisposable Members
+
+        private bool _isDisposed;
+
+        /// <summary>
+        /// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
+        /// </summary>
+        public void Dispose()
+        {
+            Dispose(true);
+            GC.SuppressFinalize(this);
+        }
+
+        /// <summary>
+        /// Releases unmanaged and - optionally - managed resources
+        /// </summary>
+        /// <param name="disposing"><c>true</c> to release both managed and unmanaged resources; <c>false</c> to release only unmanaged resources.</param>
+        protected virtual void Dispose(bool disposing)
+        {
+            if (_isDisposed)
+                return;
+
+            if (disposing)
+            {
+                _isDisposed = true;
+            }
+        }
+
+        /// <summary>
+        /// Releases unmanaged resources and performs other cleanup operations before the
+        /// <see cref="DsaKey"/> is reclaimed by garbage collection.
+        /// </summary>
+        ~EcdsaKey()
+        {
+            Dispose(false);
+        }
+
+        #endregion
+    }
+}
+#endif
\ No newline at end of file