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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;
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);
    }
}