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();
+ }
+ }
+}
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