org.bouncycastle.bcpg.ModDetectionCodePacket Maven / Gradle / Ivy

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The Bouncy Castle Java APIs for the OpenPGP Protocol. The APIs are designed primarily to be used in conjunction with the BC LTS provider but may also be used with other providers providing cryptographic services.

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package org.bouncycastle.bcpg;

import java.io.IOException;

/**
 * basic packet for a modification detection code packet.
 */
public class ModDetectionCodePacket 
    extends ContainedPacket
{    
    private byte[]    digest;

    ModDetectionCodePacket(
            BCPGInputStream in)
            throws IOException
    {
        this(in, false);
    }

    ModDetectionCodePacket(
        BCPGInputStream in,
        boolean newPacketFormat)
        throws IOException
    {
        super(MOD_DETECTION_CODE, newPacketFormat);

        this.digest = new byte[20];
        in.readFully(this.digest);
    }
    
    public ModDetectionCodePacket(
        byte[]    digest)
        throws IOException
    {
        super(MOD_DETECTION_CODE);

        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(hasNewPacketFormat(), MOD_DETECTION_CODE, digest);
    }
}