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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.sig;

import org.bouncycastle.bcpg.SignatureSubpacket;
import org.bouncycastle.bcpg.SignatureSubpacketTags;

/**
 * Represents revocation key OpenPGP signature sub packet.
 */
public class RevocationKey extends SignatureSubpacket
{
    // 1 octet of class, 
    // 1 octet of public-key algorithm ID, 
    // 20 octets of fingerprint
    public RevocationKey(boolean isCritical, boolean isLongLength, byte[] data)
    {
        super(SignatureSubpacketTags.REVOCATION_KEY, isCritical, isLongLength, data);
    }

    public RevocationKey(boolean isCritical, byte signatureClass, int keyAlgorithm,
        byte[] fingerprint)
    {
        super(SignatureSubpacketTags.REVOCATION_KEY, isCritical, false, createData(signatureClass,
            (byte)(keyAlgorithm & 0xff), fingerprint));
    }

    private static byte[] createData(byte signatureClass, byte keyAlgorithm, byte[] fingerprint)
    {
        byte[] data = new byte[2 + fingerprint.length];
        data[0] = signatureClass;
        data[1] = keyAlgorithm;
        System.arraycopy(fingerprint, 0, data, 2, fingerprint.length);
        return data;
    }

    public byte getSignatureClass()
    {
        return this.getData()[0];
    }

    public int getAlgorithm()
    {
        return this.getData()[1];
    }

    public byte[] getFingerprint()
    {
        byte[] data = this.getData();
        byte[] fingerprint = new byte[data.length - 2];
        System.arraycopy(data, 2, fingerprint, 0, fingerprint.length);
        return fingerprint;
    }
}