From 176743ab5faec2dd275b5efd3a2dd62c610f237a Mon Sep 17 00:00:00 2001
From: Oren Novotny <oren@novotny.org>
Date: Wed, 26 Feb 2014 10:08:50 -0500
Subject: Add BouncyCastle PCL files

---
 Crypto/src/crypto/tls/TlsDsaSigner.cs | 51 +++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 Crypto/src/crypto/tls/TlsDsaSigner.cs

(limited to 'Crypto/src/crypto/tls/TlsDsaSigner.cs')

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();
+	}
+}
-- 
cgit 1.5.1