[Security] Update bindings to Xcode 26 beta 1-7. (#23714)

Author: rolfbjarne

src/Security/SecIdentity.cs

@@ -39,5 +39,33 @@ public SecKey PrivateKey {
 				return new SecKey (p, true);
 			}
 		}
+
+		[SupportedOSPlatform ("ios26.0")]
+		[SupportedOSPlatform ("maccatalyst26.0")]
+		[SupportedOSPlatform ("macos26.0")]
+		[SupportedOSPlatform ("tvos26.0")]
+		[DllImport (Constants.SecurityLibrary)]
+		extern static /* __nullable CF_RETURNS_RETAINED SecIdentityRef */ IntPtr SecIdentityCreate (
+			IntPtr /* CFAllocatorRef __nullable */ allocator,
+			IntPtr /* SecCertificateRef */ certificate,
+			IntPtr /* SecKeyRef */ privateKey);
+
+		/// <summary>Create a <see cref="SecIdentity" /> instance from a certificate and a private key.</summary>
+		/// <param name="certificate">The certificate to use for the new <see cref="SecIdentity" /> instance.</param>
+		/// <param name="privateKey">The private to use for the new <see cref="SecIdentity" /> instance.</param>
+		/// <returns>A new <see cref="SecIdentity" /> instance if successful, otherwise <see langword="null" />.</returns>
+		[SupportedOSPlatform ("ios26.0")]
+		[SupportedOSPlatform ("maccatalyst26.0")]
+		[SupportedOSPlatform ("macos26.0")]
+		[SupportedOSPlatform ("tvos26.0")]
+		public static SecIdentity? Create (SecCertificate certificate, SecKey privateKey)
+		{
+			var rv = SecIdentityCreate (IntPtr.Zero, certificate.GetNonNullHandle (nameof (certificate)), privateKey.GetNonNullHandle (nameof (privateKey)));
+			GC.KeepAlive (certificate);
+			GC.KeepAlive (privateKey);
+			if (rv == IntPtr.Zero)
+				return null;
+			return new SecIdentity (rv, true /* CF_RETURNS_RETAINED */);
+		}
 	}
 }

tests/monotouch-test/Security/IdentityTest.cs

@@ -31,6 +31,16 @@ static public SecIdentity GetIdentity ()
 			}
 		}
 
+		[Test]
+		public void Create ()
+		{
+			TestRuntime.AssertXcodeVersion (26, 0);
+
+			using var identity = GetIdentity ();
+			using var newIdentity = SecIdentity.Create (identity.Certificate, identity.PrivateKey);
+			Assert.That (newIdentity, Is.Not.Null, "new identity");
+		}
+
 		[Test]
 		public void Identity ()
 		{