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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 and up.

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package org.bouncycastle.crypto.digests;

import java.io.ByteArrayOutputStream;

import org.bouncycastle.crypto.Digest;
import org.bouncycastle.util.Arrays;


public class NullDigest
    implements Digest
{
    private OpenByteArrayOutputStream bOut = new OpenByteArrayOutputStream();

    public String getAlgorithmName()
    {
        return "NULL";
    }

    public int getDigestSize()
    {
        return bOut.size();
    }

    public void update(byte in)
    {
        bOut.write(in);
    }

    public void update(byte[] in, int inOff, int len)
    {
        bOut.write(in, inOff, len);
    }

    public int doFinal(byte[] out, int outOff)
    {
        int size = bOut.size();

        bOut.copy(out, outOff);

        reset();
        
        return size;
    }

    public void reset()
    {
        bOut.reset();
    }

    private static class OpenByteArrayOutputStream
        extends ByteArrayOutputStream
    {
        public void reset()
        {
            super.reset();

            Arrays.clear(buf);
        }

        void copy(byte[] out, int outOff)
        {
            System.arraycopy(buf, 0, out, outOff, this.size());
        }
    }
}