CombinedHash.cs :  » PDF » iTextSharp » Org » BouncyCastle » Crypto » Tls » C# / CSharp Open Source

using System;

using Org.BouncyCastle.Crypto.Digests;

namespace Org.BouncyCastle.Crypto.Tls{
  /// <remarks>A combined hash, which implements md5(m) || sha1(m).</remarks>
  public class CombinedHash
    : IDigest
  {
    private IDigest md5 = new MD5Digest();
    private IDigest sha1 = new Sha1Digest();

    /// <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();
    }
  }
}