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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 1.8. 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;

/**
 * Signature Subpacket marking a User ID as primary.
 *
 * @see 
 *     RFC4880 - Primary User ID
 * @see 
 *     RFC9580 - Primary User ID
 */
public class PrimaryUserID 
    extends SignatureSubpacket
{
    public PrimaryUserID(
        boolean    critical,
        boolean    isLongLength,
        byte[]     data)
    {
        super(SignatureSubpacketTags.PRIMARY_USER_ID, critical, isLongLength, data);
    }
    
    public PrimaryUserID(
        boolean    critical,
        boolean    isPrimaryUserID)
    {
        super(SignatureSubpacketTags.PRIMARY_USER_ID, critical, false, Utils.booleanToByteArray(isPrimaryUserID));
    }
    
    public boolean isPrimaryUserID()
    {
        return Utils.booleanFromByteArray(data);
    }
}