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The Bouncy Castle Java API for handling the OpenPGP protocol. This jar contains the OpenPGP API for JDK 1.5 to JDK 1.8. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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package org.bouncycastle.bcpg;

import java.io.IOException;
import java.security.SecureRandom;

import org.bouncycastle.util.Arrays;
import org.bouncycastle.util.io.Streams;

public class PaddingPacket
    extends ContainedPacket
{
    private final byte[] padding;

    public PaddingPacket(BCPGInputStream in)
            throws IOException
    {
        this(in, true);
    }

    public PaddingPacket(BCPGInputStream in, boolean newPacketFormat)
        throws IOException
    {
        super(PADDING, newPacketFormat);

        padding = Streams.readAll(in);
    }

    public PaddingPacket(byte[] padding)
    {
        super(PADDING, true);

        this.padding = padding;
    }

    public PaddingPacket(int octetLen, SecureRandom random)
    {
        this(randomBytes(octetLen, random));
    }

    private static byte[] randomBytes(int octetCount, SecureRandom random)
    {
        if (octetCount <= 0)
        {
            throw new IllegalArgumentException("Octet count MUST NOT be 0 nor negative.");
        }
        byte[] bytes = new byte[octetCount];
        random.nextBytes(bytes);
        return bytes;
    }

    public byte[] getPadding()
    {
        return Arrays.clone(padding);
    }

    @Override
    public void encode(BCPGOutputStream pOut)
        throws IOException
    {
        pOut.writePacket(hasNewPacketFormat(), PacketTags.PADDING, padding);
    }
}