ssl: add post-quantum cryptography (PQC) tests

Note the key files were created by the following commands.

```
$ ${HOME}/.local/openssl-3.6.0-dev-fips-debug-8253b58d60/bin/openssl genpkey \
  -algorithm mldsa65 \
  -out mldsa65.pem
$ ${HOME}/.local/openssl-3.6.0-dev-fips-debug-8253b58d60/bin/openssl genpkey \
  -algorithm mldsa65 \
  -out mldsa-1.pem
```

Author: junaruga

test/openssl/fixtures/pkey/mldsa-1.pem

@@ -0,0 +1,88 @@
+-----BEGIN PRIVATE KEY-----
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+-----END PRIVATE KEY-----

test/openssl/fixtures/pkey/mldsa65.pem

@@ -0,0 +1,88 @@
+-----BEGIN PRIVATE KEY-----
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+nC0YNZZ0cYyN24xw8Bxzcc9RkY8/MFfbTXOG43Uuh7fkPIdY2NQSUK2tkfiMdPgu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+-----END PRIVATE KEY-----

test/openssl/test_ssl.rb

@@ -2062,6 +2062,50 @@ def test_get_sigalg
     end
   end
 
+  def test_pqc_sigalg
+    # Post-quantum cryptography is supported on OpenSSL 3.5 or later.
+    return unless openssl?(3, 5, 0)
+
+    mldsa = Fixtures.pkey("mldsa65")
+    mldsa_ca_key  = Fixtures.pkey("mldsa-1")
+    mldsa_ca_cert = issue_cert(@ca, mldsa_ca_key, 1, @ca_exts, nil, nil,
+                               digest: nil)
+    mldsa_cert = issue_cert(@svr, mldsa, 60, [], mldsa_ca_cert, mldsa_ca_key,
+                            digest: nil)
+    rsa = Fixtures.pkey("rsa2048")
+    rsa_cert = issue_cert(@svr, rsa, 61, [], @ca_cert, @ca_key)
+    ctx_proc = -> ctx {
+      ctx.add_certificate(mldsa_cert, mldsa)
+      ctx.add_certificate(rsa_cert, rsa)
+    }
+
+    server_proc = -> (ctx, ssl) {
+      assert_equal('mldsa65', ssl.sigalg)
+
+      readwrite_loop(ctx, ssl)
+    }
+    start_server(ctx_proc: ctx_proc, server_proc: server_proc) do |port|
+      server_connect(port) { |ssl|
+        assert_equal('mldsa65', ssl.peer_sigalg)
+        ssl.puts "abc"; ssl.gets
+      }
+    end
+
+    server_proc = -> (ctx, ssl) {
+      assert_equal('rsa_pss_rsae_sha256', ssl.sigalg)
+
+      readwrite_loop(ctx, ssl)
+    }
+    start_server(ctx_proc: ctx_proc, server_proc: server_proc) do |port|
+      ctx = OpenSSL::SSL::SSLContext.new
+      ctx.sigalgs = 'rsa_pss_rsae_sha256'
+      server_connect(port, ctx) { |ssl|
+        assert_equal('rsa_pss_rsae_sha256', ssl.peer_sigalg)
+        ssl.puts "abc"; ssl.gets
+      }
+    end
+  end
+
   def test_connect_works_when_setting_dh_callback_to_nil
     omit "AWS-LC does not support DHE ciphersuites" if aws_lc?
 
@@ -2158,6 +2202,29 @@ def test_set_groups_tls13
     end
   end
 
+  def test_pqc_group
+    # Post-quantum cryptography is supported on OpenSSL 3.5 or later.
+    return unless openssl?(3, 5, 0)
+
+    [
+      'X25519MLKEM768',
+      'SecP256r1MLKEM768',
+      'SecP384r1MLKEM1024'
+    ].each do |group|
+      ctx_proc = -> ctx {
+        ctx.groups = group
+      }
+      start_server(ctx_proc: ctx_proc) do |port|
+        ctx = OpenSSL::SSL::SSLContext.new
+        ctx.groups = group
+        server_connect(port, ctx) { |ssl|
+          assert_equal(group, ssl.group)
+          ssl.puts "abc"; ssl.gets
+        }
+      end
+    end
+  end
+
   def test_security_level
     ctx = OpenSSL::SSL::SSLContext.new
     ctx.security_level = 1

test/openssl/utils.rb

@@ -177,16 +177,16 @@ def setup
     @ca  = OpenSSL::X509::Name.parse("/DC=org/DC=ruby-lang/CN=CA")
     @svr = OpenSSL::X509::Name.parse("/DC=org/DC=ruby-lang/CN=localhost")
     @cli = OpenSSL::X509::Name.parse("/DC=org/DC=ruby-lang/CN=localhost")
-    ca_exts = [
+    @ca_exts = [
       ["basicConstraints","CA:TRUE",true],
       ["keyUsage","cRLSign,keyCertSign",true],
     ]
-    ee_exts = [
+    @ee_exts = [
       ["keyUsage","keyEncipherment,digitalSignature",true],
     ]
-    @ca_cert  = issue_cert(@ca, @ca_key, 1, ca_exts, nil, nil)
-    @svr_cert = issue_cert(@svr, @svr_key, 2, ee_exts, @ca_cert, @ca_key)
-    @cli_cert = issue_cert(@cli, @cli_key, 3, ee_exts, @ca_cert, @ca_key)
+    @ca_cert  = issue_cert(@ca, @ca_key, 1, @ca_exts, nil, nil)
+    @svr_cert = issue_cert(@svr, @svr_key, 2, @ee_exts, @ca_cert, @ca_key)
+    @cli_cert = issue_cert(@cli, @cli_key, 3, @ee_exts, @ca_cert, @ca_key)
     @server = nil
   end