NullDigest.cs :  » PDF » iTextSharp » Org » BouncyCastle » Crypto » Digests » C# / CSharp Open Source

using System;
using System.IO;

namespace Org.BouncyCastle.Crypto.Digests{
  public class NullDigest : IDigest
  {
    private readonly MemoryStream bOut = new MemoryStream();

    public string AlgorithmName
    {
      get { return "NULL"; }
    }

    public int GetByteLength()
    {
      // TODO Is this okay?
      return 0;
    }

    public int GetDigestSize()
    {
      return (int) bOut.Length;
    }

    public void Update(byte b)
    {
      bOut.WriteByte(b);
    }

    public void BlockUpdate(byte[] inBytes, int inOff, int len)
    {
      bOut.Write(inBytes, inOff, len);
    }

    public int DoFinal(byte[] outBytes, int outOff)
    {
      byte[] res = bOut.ToArray();
      res.CopyTo(outBytes, outOff);
      Reset();
      return res.Length;
    }

    public void Reset()
    {
      bOut.SetLength(0);
    }
  }
}