ML-DSA PFX support

src/libraries/Common/src/Interop/Unix/System.Security.Cryptography.Native/Interop.EvpPkey.cs

@@ -339,6 +339,7 @@ internal enum EvpAlgorithmFamilyId
             ECC = 3,
             MLKem = 4,
             SlhDsa = 5,
+            MLDsa = 6,
         }
     }
 }

src/libraries/Common/tests/System/Security/Cryptography/AlgorithmImplementations/MLDsa/MLDsaImplementationTests.cs

@@ -517,16 +517,16 @@ public void RoundTrip_Import_Export_Pkcs8PrivateKeyPem(MLDsaKeyInfo info)
         {
             MLDsaTestHelpers.AssertImportFromPem(import =>
                 MLDsaTestHelpers.AssertExportToPrivateKeyPem(export =>
-                    WithDispose(import(info.PrivateKeyPem), mldsa =>
-                        Assert.Equal(info.PrivateKeyPem, export(mldsa)))));
+                    WithDispose(import(info.PrivateKeyPem_Seed), mldsa =>
+                        Assert.Equal(info.PrivateKeyPem_Seed, export(mldsa)))));
         }
 
         [Theory]
         [MemberData(nameof(MLDsaTestsData.IetfMLDsaAlgorithms), MemberType = typeof(MLDsaTestsData))]
         public void RoundTrip_EncryptedPrivateKey(MLDsaKeyInfo info)
         {
             // Load key
-            using MLDsa mldsa = MLDsa.ImportEncryptedPkcs8PrivateKey(info.EncryptionPassword, info.Pkcs8EncryptedPrivateKey);
+            using MLDsa mldsa = MLDsa.ImportEncryptedPkcs8PrivateKey(info.EncryptionPassword, info.Pkcs8EncryptedPrivateKey_Seed);
 
             byte[] secretKey = new byte[mldsa.Algorithm.SecretKeySizeInBytes];
             mldsa.ExportMLDsaSecretKey(secretKey);

src/libraries/Common/tests/System/Security/Cryptography/AlgorithmImplementations/MLDsa/MLDsaTestHelpers.cs

@@ -12,6 +12,8 @@ namespace System.Security.Cryptography.Tests
 {
     internal static class MLDsaTestHelpers
     {
+        internal static bool MLDsaIsNotSupported => !MLDsa.IsSupported;
+
         // DER encoding of ASN.1 BitString "foo"
         internal static readonly ReadOnlyMemory<byte> s_derBitStringFoo = new byte[] { 0x03, 0x04, 0x00, 0x66, 0x6f, 0x6f };
 

src/libraries/Common/tests/System/Security/Cryptography/AlgorithmImplementations/MLDsa/MLDsaTestsData.cs

@@ -3,9 +3,7 @@
 
 using System.Collections.Generic;
 using System.Text;
-using Microsoft.DotNet.XUnitExtensions;
 using Test.Cryptography;
-using Xunit;
 
 namespace System.Security.Cryptography.Tests
 {
@@ -18,8 +16,13 @@ public record MLDsaKeyInfo(
             string Pkcs8PrivateKey_Expanded_Base64,
             string Pkcs8PrivateKey_Both_Base64,
             string Pkcs8PublicKeyBase64,
-            string Pkcs8EncryptedPrivateKeyBase64,
+            string Pkcs8EncryptedPrivateKey_Seed_Base64,
+            string Pkcs8EncryptedPrivateKey_Expanded_Base64,
+            string Pkcs8EncryptedPrivateKey_Both_Base64,
             string CertificateBase64,
+            string Pfx_Seed_Base64,
+            string Pfx_Expanded_Base64,
+            string Pfx_Both_Base64,
             string EncryptionPassword,
             PbeParameters EncryptionParameters)
     {
@@ -30,12 +33,22 @@ public record MLDsaKeyInfo(
         public byte[] Pkcs8PrivateKey_Expanded => Convert.FromBase64String(Pkcs8PrivateKey_Expanded_Base64);
         public byte[] Pkcs8PrivateKey_Both => Convert.FromBase64String(Pkcs8PrivateKey_Both_Base64);
         public byte[] Pkcs8PublicKey => Convert.FromBase64String(Pkcs8PublicKeyBase64);
-        public byte[] Pkcs8EncryptedPrivateKey => Convert.FromBase64String(Pkcs8EncryptedPrivateKeyBase64);
+        public byte[] Pkcs8EncryptedPrivateKey_Seed => Convert.FromBase64String(Pkcs8EncryptedPrivateKey_Seed_Base64);
+        public byte[] Pkcs8EncryptedPrivateKey_Expanded => Convert.FromBase64String(Pkcs8EncryptedPrivateKey_Expanded_Base64);
+        public byte[] Pkcs8EncryptedPrivateKey_Both => Convert.FromBase64String(Pkcs8EncryptedPrivateKey_Both_Base64);
         public byte[] EncryptionPasswordBytes => Encoding.UTF8.GetBytes(EncryptionPassword); // Assuming UTF-8 encoding
         public byte[] Certificate => Convert.FromBase64String(CertificateBase64);
-        public string EncryptedPem => PemEncoding.WriteString("ENCRYPTED PRIVATE KEY", Pkcs8EncryptedPrivateKey);
-        public string PrivateKeyPem => PemEncoding.WriteString("PRIVATE KEY", Pkcs8PrivateKey_Seed);
+        public string EncryptedPem_Seed => PemEncoding.WriteString("ENCRYPTED PRIVATE KEY", Pkcs8EncryptedPrivateKey_Seed);
+        public string EncryptedPem_Expanded => PemEncoding.WriteString("ENCRYPTED PRIVATE KEY", Pkcs8EncryptedPrivateKey_Expanded);
+        public string EncryptedPem_Both => PemEncoding.WriteString("ENCRYPTED PRIVATE KEY", Pkcs8EncryptedPrivateKey_Both);
+        public string PrivateKeyPem_Seed => PemEncoding.WriteString("PRIVATE KEY", Pkcs8PrivateKey_Seed);
+        public string PrivateKeyPem_Expanded => PemEncoding.WriteString("PRIVATE KEY", Pkcs8PrivateKey_Expanded);
+        public string PrivateKeyPem_Both => PemEncoding.WriteString("PRIVATE KEY", Pkcs8PrivateKey_Both);
         public string PublicKeyPem => PemEncoding.WriteString("PUBLIC KEY", Pkcs8PublicKey);
+        public string CertificatePem => PemEncoding.WriteString("CERTIFICATE", Certificate);
+        public byte[] Pfx_Seed => Convert.FromBase64String(Pfx_Seed_Base64);
+        public byte[] Pfx_Expanded => Convert.FromBase64String(Pfx_Expanded_Base64);
+        public byte[] Pfx_Both => Convert.FromBase64String(Pfx_Both_Base64);
 
         public override string ToString() =>
             $"{nameof(MLDsaKeyInfo)} {{ {nameof(Algorithm)} = \"{Algorithm.Name}\" }}";
@@ -2202,5 +2215,132 @@ public static IEnumerable<object[]> AllNistTestCases()
                         "00000000000000000000000000000000000000090F13161E242832",
                 },
             ];
+
+        internal static byte[] IetfMLDsa_Pfx_Pbes1 => field ??= Convert.FromBase64String(
+            """
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+            o3JYvipqCe6Zn/knmLZqp/yLzZM8v1ON/PL9MhBYDQAr19htsEgxUU5Jb1wJj28LiH2+8+Bi1EE7
+            La+rG/54rQ/ZydxL6aWphbPSVZGcuGiWCGn2Bb1NGA3Izb0yND/+488viKQTn/hJQSG5a1bCQ6rZ
+            VyqBVs9V1v/DevxUeF3ntfOmbgu/yxLsNNKkt/nC2xd2OCTe+TgQLhQ81moHYkLDs2RxS2i4mNSv
+            JCR3sI8eGI1B+J/hKrNKJULeKTTs1w2aZ76eWP+SLDoLw1PifrMu7iubWbTtrFpGkMxlgHYYJKXO
+            xNWVdMygeInCC8ogQyIwGhecgwsc3krAPHbVIZH2TrqQXFiskuOxsYyIhk+qtpW10DWhBfXOmnnE
+            1WbBPVOQLme2adw1JN0XVLCQxx8Zt0sUoMDB0uOinyZRKet4OmW0d937bI8Vbof28ArzBL7oUM0R
+            6W+ZZFgj/VKSbe/wpFY3lLV7EET6WHVsejR34IOIt/zqqOtrIiFOl74KfE1MBw0+NmGmTcyp3kKX
+            4wOduAxysvQ+Kbz7XlNnNOOC1HnNVxtqzhsUyW+EmtZ6jylTvb6ZSKdl6rtSjS3rlN1r48cScCO/
+            SccEX+fdWQT5wl1ESn4N3oWTfXRJYeTMP89uo/flbdmxDGGEr6vQklASDgF99ZHyvPcolJNtRqws
+            M0n6mmK2j6I0evfV2TJWArN0m/4pbc4O6uEBRALYfCUNsMChdS02Npqe2J+uOpzo9r3KQjsZua8y
+            lORNLCkpl7ywawCQtQr5+gNbh/rpd+aP43LRHX5/bn6ulHwLrw1JIhFa32jfXFMvMYOiY+7tIeAj
+            7gFgTfIhV/dnNIOcw7aXm6SKAiTUrpCDyya+Gogj9YpEuaVSfhj5XLqeP7JPu8Izwk3NZs0OJHNj
+            kuozarnMsa4ByiObYoonzgUewgg4OBqRrAoGPqHn41kFOmVq5dcU/7jFk8FbMUjOs2k3S5iNJdWB
+            6Ho3SltjrxBchmDKS+g6AAqv1/2gstg8VK9MgTD9SbYTGU/xXdpso7LuxWw8mtSv9fyAovajkdBl
+            OURNyHRH7ovrtXHbiknHk1kuxRDqAdYFtQ9vhBzShFRldkGigYZV9k7w1+piBDw0TZt0lV8e/w65
+            iPTbZWPQTk4CvPcXPN+IUCJNP/myuiEFdfOEfjkQtB+wGYA7SBHVMigqXRHweeQpndMFKlz1yS2I
+            zP68x0nCCd3k0D4SpR3cKzElMCMGCSqGSIb3DQEJFTEWBBQIVLrr45wBNM4q909uTFSEU/UelzAt
+            MCEwCQYFKw4DAhoFAAQULb2cmrCiyjaTffRB9U3Yb1M8gIoECO+u8AsjAw8G
+            """);
     }
 }

src/libraries/System.Security.Cryptography/ref/System.Security.Cryptography.cs

@@ -3225,6 +3225,8 @@ public Pkcs12LoadLimitExceededException(string propertyName) { }
     public sealed partial class PublicKey
     {
         public PublicKey(System.Security.Cryptography.AsymmetricAlgorithm key) { }
+        [System.Diagnostics.CodeAnalysis.ExperimentalAttribute("SYSLIB5006")]
+        public PublicKey(System.Security.Cryptography.MLDsa key) { }
         [System.Diagnostics.CodeAnalysis.ExperimentalAttribute("SYSLIB5006", UrlFormat="https://aka.ms/dotnet-warnings/{0}")]
         public PublicKey(System.Security.Cryptography.MLKem key) { }
         public PublicKey(System.Security.Cryptography.Oid oid, System.Security.Cryptography.AsnEncodedData? parameters, System.Security.Cryptography.AsnEncodedData keyValue) { }

src/libraries/System.Security.Cryptography/src/System/Security/Cryptography/X509Certificates/OpenSslExportProvider.cs

@@ -56,6 +56,14 @@ protected override byte[] ExportPkcs8(
                 }
             }
 
+            if (evpAlgId == Interop.Crypto.EvpAlgorithmFamilyId.MLDsa)
+            {
+                using (MLDsaOpenSsl mldsa = new MLDsaOpenSsl(privateKey))
+                {
+                    return mldsa.ExportEncryptedPkcs8PrivateKey(password, pbeParameters);
+                }
+            }
+
             if (evpAlgId == Interop.Crypto.EvpAlgorithmFamilyId.SlhDsa)
             {
                 using (SlhDsaOpenSsl slhDsa = new SlhDsaOpenSsl(privateKey))

src/libraries/System.Security.Cryptography/src/System/Security/Cryptography/X509Certificates/PublicKey.cs

@@ -74,6 +74,23 @@ public PublicKey(MLKem key) : this(key.ExportSubjectPublicKeyInfo())
         {
         }
 
+        /// <summary>
+        /// Initializes a new instance of the <see cref="PublicKey" /> class
+        /// using SubjectPublicKeyInfo from an <see cref="MLDsa" />.
+        /// </summary>
+        /// <param name="key">
+        /// An <see cref="MLDsa" /> key to obtain the SubjectPublicKeyInfo from.
+        /// </param>
+        /// <exception cref="CryptographicException">
+        /// The SubjectPublicKeyInfo could not be decoded. The
+        /// <see cref="MLDsa.ExportSubjectPublicKeyInfo" /> must return a
+        /// valid ASN.1-DER encoded X.509 SubjectPublicKeyInfo.
+        /// </exception>
+        [Experimental(Experimentals.PostQuantumCryptographyDiagId)]
+        public PublicKey(MLDsa key) : this(key.ExportSubjectPublicKeyInfo())
+        {
+        }
+
         /// <summary>
         /// Initializes a new instance of the <see cref="PublicKey" /> class
         /// using SubjectPublicKeyInfo from an <see cref="SlhDsa" />.

src/libraries/System.Security.Cryptography/src/System/Security/Cryptography/X509Certificates/X509Certificate2.cs

@@ -1282,6 +1282,12 @@ Oids.EcPublicKey when IsECDsa(certificate) =>
                             [PemLabels.Pkcs8PrivateKey],
                             MLKem.ImportFromPem,
                             certificate.CopyWithPrivateKey),
+                    Oids.MLDsa44 or Oids.MLDsa65 or Oids.MLDsa87 =>
+                        ExtractKeyFromPem<MLDsa>(
+                            keyPem,
+                            [PemLabels.Pkcs8PrivateKey],
+                            MLDsa.ImportFromPem,
+                            certificate.CopyWithPrivateKey),
                     _ when Helpers.IsSlhDsaOid(keyAlgorithm) =>
                         ExtractKeyFromPem<SlhDsa>(
                             keyPem,
@@ -1375,6 +1381,12 @@ Oids.EcPublicKey when IsECDsa(certificate) =>
                             password,
                             MLKem.ImportFromEncryptedPem,
                             certificate.CopyWithPrivateKey),
+                    Oids.MLDsa44 or Oids.MLDsa65 or Oids.MLDsa87 =>
+                        ExtractKeyFromEncryptedPem<MLDsa>(
+                            keyPem,
+                            password,
+                            MLDsa.ImportFromEncryptedPem,
+                            certificate.CopyWithPrivateKey),
                     _ when Helpers.IsSlhDsaOid(keyAlgorithm) =>
                         ExtractKeyFromEncryptedPem<SlhDsa>(
                             keyPem,