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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.FingerprintUtil;
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];
        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);
    }
}