diff --git a/Crypto/src/crypto/tls/TlsDsaSigner.cs b/Crypto/src/crypto/tls/TlsDsaSigner.cs
new file mode 100644
index 000000000..27d7b1f91
--- /dev/null
+++ b/Crypto/src/crypto/tls/TlsDsaSigner.cs
@@ -0,0 +1,51 @@
+using System;
+
+using Org.BouncyCastle.Crypto.Digests;
+using Org.BouncyCastle.Crypto.Parameters;
+using Org.BouncyCastle.Crypto.Signers;
+using Org.BouncyCastle.Security;
+
+namespace Org.BouncyCastle.Crypto.Tls
+{
+ internal abstract class TlsDsaSigner
+ : TlsSigner
+ {
+ public virtual byte[] CalculateRawSignature(SecureRandom random,
+ AsymmetricKeyParameter privateKey, byte[] md5andsha1)
+ {
+ ISigner s = MakeSigner(new NullDigest(), true, new ParametersWithRandom(privateKey, random));
+ // Note: Only use the SHA1 part of the hash
+ s.BlockUpdate(md5andsha1, 16, 20);
+ return s.GenerateSignature();
+ }
+
+ public bool VerifyRawSignature(byte[] sigBytes, AsymmetricKeyParameter publicKey, byte[] md5andsha1)
+ {
+ ISigner s = MakeSigner(new NullDigest(), false, publicKey);
+ // Note: Only use the SHA1 part of the hash
+ s.BlockUpdate(md5andsha1, 16, 20);
+ return s.VerifySignature(sigBytes);
+ }
+
+ public virtual ISigner CreateSigner(SecureRandom random, AsymmetricKeyParameter privateKey)
+ {
+ return MakeSigner(new Sha1Digest(), true, new ParametersWithRandom(privateKey, random));
+ }
+
+ public virtual ISigner CreateVerifyer(AsymmetricKeyParameter publicKey)
+ {
+ return MakeSigner(new Sha1Digest(), false, publicKey);
+ }
+
+ public abstract bool IsValidPublicKey(AsymmetricKeyParameter publicKey);
+
+ protected virtual ISigner MakeSigner(IDigest d, bool forSigning, ICipherParameters cp)
+ {
+ ISigner s = new DsaDigestSigner(CreateDsaImpl(), d);
+ s.Init(forSigning, cp);
+ return s;
+ }
+
+ protected abstract IDsa CreateDsaImpl();
+ }
+}
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