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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 FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified and used appropriately.

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package org.bouncycastle.bcpg;

import java.io.IOException;

import org.bouncycastle.util.Arrays;

/**
 * Packet representing AEAD encrypted data. At the moment this appears to exist in the following
 * expired draft only, but it's appearing despite this.
 *
 * @ref https://datatracker.ietf.org/doc/html/draft-ietf-openpgp-rfc4880bis-04#section-5.16
 */
public class AEADEncDataPacket
    extends InputStreamPacket
    implements AEADAlgorithmTags
{
    private final byte version;
    private final byte algorithm;
    private final byte aeadAlgorithm;
    private final byte chunkSize;
    private final byte[] iv;

    public AEADEncDataPacket(BCPGInputStream in)
        throws IOException
    {
        super(in);

        version = (byte)in.read();
        if (version != 1)
        {
            throw new IllegalArgumentException("wrong AEAD packet version: " + version);
        }

        algorithm = (byte)in.read();
        aeadAlgorithm = (byte)in.read();
        chunkSize = (byte)in.read();

        iv = new byte[getIVLength(aeadAlgorithm)];
        in.read(iv, 0, iv.length);
    }

    public AEADEncDataPacket(int algorithm, int aeadAlgorithm, int chunkSize, byte[] iv)
    {
        super(null);
        this.version = 1;
        this.algorithm = (byte)algorithm;
        this.aeadAlgorithm = (byte)aeadAlgorithm;
        this.chunkSize = (byte)chunkSize;
        this.iv = Arrays.clone(iv);
    }

    public byte getVersion()
    {
        return version;
    }

    public byte getAlgorithm()
    {
        return algorithm;
    }

    public byte getAEADAlgorithm()
    {
        return aeadAlgorithm;
    }

    public int getChunkSize()
    {
        return chunkSize;
    }

    public byte[] getIV()
    {
        return iv;
    }

    public static int getIVLength(byte aeadAlgorithm)
    {
        switch (aeadAlgorithm)
        {
        case EAX:
            return 16;
        case OCB:
            return 15;
        case GCM:
            return 12;
        default:
            throw new IllegalArgumentException("unknown mode: " + aeadAlgorithm);
        }
    }
}