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;

/**
 * <pre>
 * SMIMEEncryptionKeyPreference ::= CHOICE {
 * 	issuerAndSerialNumber   [0] IssuerAndSerialNumber,
 * 	receipentKeyId          [1] RecipientKeyIdentifier,
 * 	subjectAltKeyIdentifier [2] SubjectKeyIdentifier
 * }
 * </pre>
 */
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)));
	}
}
