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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 1.7. 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.sig;

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

/**
 * packet giving the issuer key ID.
 */
public class IssuerKeyID 
    extends SignatureSubpacket
{
    protected static byte[] keyIDToBytes(
        long    keyId)
    {
        byte[]    data = new byte[8];
        
        data[0] = (byte)(keyId >> 56);
        data[1] = (byte)(keyId >> 48);
        data[2] = (byte)(keyId >> 40);
        data[3] = (byte)(keyId >> 32);
        data[4] = (byte)(keyId >> 24);
        data[5] = (byte)(keyId >> 16);
        data[6] = (byte)(keyId >> 8);
        data[7] = (byte)keyId;
        
        return data;
    }
    
    public IssuerKeyID(
        boolean    critical,
        boolean    isLongLength,
        byte[]     data)
    {
        super(SignatureSubpacketTags.ISSUER_KEY_ID, critical, isLongLength, data);
    }
    
    public IssuerKeyID(
        boolean    critical,
        long       keyID)
    {
        super(SignatureSubpacketTags.ISSUER_KEY_ID, critical, false, keyIDToBytes(keyID));
    }
    
    public long getKeyID()
    {
        long    keyID = ((long)(data[0] & 0xff) << 56) | ((long)(data[1] & 0xff) << 48) | ((long)(data[2] & 0xff) << 40) | ((long)(data[3] & 0xff) << 32)
                                | ((long)(data[4] & 0xff) << 24) | ((data[5] & 0xff) << 16) | ((data[6] & 0xff) << 8) | (data[7] & 0xff);
        
        return keyID;
    }
}