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The Bouncy Castle Java APIs for ASN.1 extension and utility APIs used to support bcpkix and bctls. This jar contains APIs for JDK 1.8 and up.

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package org.bouncycastle.asn1.smime;

import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.DERSet;
import org.bouncycastle.asn1.DERTaggedObject;
import org.bouncycastle.asn1.cms.Attribute;
import org.bouncycastle.asn1.cms.IssuerAndSerialNumber;
import org.bouncycastle.asn1.cms.RecipientKeyIdentifier;

/**
 * The SMIMEEncryptionKeyPreference object.
 *  * SMIMEEncryptionKeyPreference ::= CHOICE {
 *     issuerAndSerialNumber   [0] IssuerAndSerialNumber,
 *     receipentKeyId          [1] RecipientKeyIdentifier,
 *     subjectAltKeyIdentifier [2] SubjectKeyIdentifier
 * }
 * 
 */
public class SMIMEEncryptionKeyPreferenceAttribute
    extends Attribute
{
    public SMIMEEncryptionKeyPreferenceAttribute(
        IssuerAndSerialNumber issAndSer)
    {
        super(SMIMEAttributes.encrypKeyPref,
                new DERSet(new DERTaggedObject(false, 0, issAndSer)));
    }
    
    public SMIMEEncryptionKeyPreferenceAttribute(
        RecipientKeyIdentifier rKeyId)
    {

        super(SMIMEAttributes.encrypKeyPref, 
                    new DERSet(new DERTaggedObject(false, 1, rKeyId)));
    }
    
    /**
     * @param sKeyId the subjectKeyIdentifier value (normally the X.509 one)
     */
    public SMIMEEncryptionKeyPreferenceAttribute(
        ASN1OctetString sKeyId)
    {

        super(SMIMEAttributes.encrypKeyPref,
                    new DERSet(new DERTaggedObject(false, 2, sKeyId)));
    }
}