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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for the Android platform. Android unfortunately ships with a stripped-down version of Bouncy Castle, which prevents easy upgrades - Spongy Castle overcomes this and provides a full, up-to-date version of the Bouncy Castle cryptographic libs.

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package org.spongycastle.bcpg.sig;

import org.spongycastle.bcpg.SignatureSubpacket;
import org.spongycastle.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;
    }
}