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The Bouncy Castle Java API for handling the OpenPGP protocol. This jar contains the OpenPGP API for JDK 1.8 and up. 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.FingerprintUtil;
import org.bouncycastle.bcpg.KeyIdentifier;
import org.bouncycastle.bcpg.SignatureSubpacket;
import org.bouncycastle.bcpg.SignatureSubpacketTags;

/**
 * Signature Subpacket containing the key-id of the issuers signing (sub-) key.
 * If the version of that key is greater than 4, this subpacket MUST NOT be included in the signature.
 * For these keys, consider the {@link IssuerFingerprint} subpacket instead.
 *
 * @see 
 *     RFC4880 - Issuer
 * @see 
 *     RFC9580 - Issuer Key ID
 */
public class IssuerKeyID 
    extends SignatureSubpacket
{
    protected static byte[] keyIDToBytes(
        long    keyId)
    {
        byte[]    data = new byte[8];
        FingerprintUtil.writeKeyID(keyId, data);
        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()
    {
        return FingerprintUtil.readKeyID(data);
    }

    public KeyIdentifier getKeyIdentifier()
    {
        return new KeyIdentifier(getKeyID());
    }
}