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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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