1 files changed, 82 insertions, 0 deletions
diff --git a/Crypto/src/crypto/tls/CombinedHash.cs b/Crypto/src/crypto/tls/CombinedHash.cs
new file mode 100644
index 000000000..59ad87a7b
--- /dev/null
+++ b/Crypto/src/crypto/tls/CombinedHash.cs
@@ -0,0 +1,82 @@
+using System;
+
+using Org.BouncyCastle.Crypto.Digests;
+
+namespace Org.BouncyCastle.Crypto.Tls
+{
+	/// <remarks>A combined hash, which implements md5(m) || sha1(m).</remarks>
+	internal class CombinedHash
+		: IDigest
+	{
+		private readonly MD5Digest md5;
+		private readonly Sha1Digest sha1;
+
+		internal CombinedHash()
+		{
+			this.md5 = new MD5Digest();
+			this.sha1 = new Sha1Digest();
+		}
+
+		internal CombinedHash(CombinedHash t)
+		{
+			this.md5 = new MD5Digest(t.md5);
+			this.sha1 = new Sha1Digest(t.sha1);
+		}
+
+		/// <seealso cref="IDigest.AlgorithmName"/>
+		public string AlgorithmName
+		{
+			get
+			{
+				return md5.AlgorithmName + " and " + sha1.AlgorithmName + " for TLS 1.0";
+			}
+		}
+
+		/// <seealso cref="IDigest.GetByteLength"/>
+		public int GetByteLength()
+		{
+			return System.Math.Max(md5.GetByteLength(), sha1.GetByteLength());
+		}
+
+		/// <seealso cref="IDigest.GetDigestSize"/>
+		public int GetDigestSize()
+		{
+			return md5.GetDigestSize() + sha1.GetDigestSize();
+		}
+
+		/// <seealso cref="IDigest.Update"/>
+		public void Update(
+			byte input)
+		{
+			md5.Update(input);
+			sha1.Update(input);
+		}
+
+		/// <seealso cref="IDigest.BlockUpdate"/>
+		public void BlockUpdate(
+			byte[]	input,
+			int		inOff,
+			int		len)
+		{
+			md5.BlockUpdate(input, inOff, len);
+			sha1.BlockUpdate(input, inOff, len);
+		}
+
+		/// <seealso cref="IDigest.DoFinal"/>
+		public int DoFinal(
+			byte[]	output,
+			int		outOff)
+		{
+			int i1 = md5.DoFinal(output, outOff);
+			int i2 = sha1.DoFinal(output, outOff + i1);
+			return i1 + i2;
+		}
+
+		/// <seealso cref="IDigest.Reset"/>
+		public void Reset()
+		{
+			md5.Reset();
+			sha1.Reset();
+		}
+	}
+}