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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for Android. Android ships with a stripped-down version of Bouncy Castle - this causes classloader collisions if you try to add an alternative (updated/complete) Bouncy Castle jar. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5.

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package org.spongycastle.bcpg;

import java.io.*;

/**
 * basic packet for a modification detection code packet.
 */
public class ModDetectionCodePacket 
    extends ContainedPacket
{    
    private byte[]    digest;
    
    ModDetectionCodePacket(
        BCPGInputStream in)
        throws IOException
    {    
        this.digest = new byte[20];
        in.readFully(this.digest);
    }
    
    public ModDetectionCodePacket(
        byte[]    digest)
        throws IOException
    {    
        this.digest = new byte[digest.length];
        
        System.arraycopy(digest, 0, this.digest, 0, this.digest.length);
    }
    
    public byte[] getDigest()
    {
        byte[] tmp = new byte[digest.length];
        
        System.arraycopy(digest, 0, tmp, 0, tmp.length);
        
        return tmp;
    }
    
    public void encode(
        BCPGOutputStream    out) 
        throws IOException
    {
        out.writePacket(MOD_DETECTION_CODE, digest, false);
    }
}