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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 LTS provider but may also be used with other providers providing cryptographic services.

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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());
    }
}