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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.6.

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package org.bouncycastle.asn1.crmf;

import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1Choice;
import org.bouncycastle.asn1.DERObject;

public class POPOPrivKey
    extends ASN1Encodable
    implements ASN1Choice
{
    private DERObject obj;

    private POPOPrivKey(DERObject obj)
    {
        this.obj = obj;
    }

    public static ASN1Encodable getInstance(ASN1TaggedObject tagged, boolean explicit)
    {
        return new POPOPrivKey(tagged.getObject()); // must be explictly tagged as choice
    }

    /**
     *      * POPOPrivKey ::= CHOICE {
     *        thisMessage       [0] BIT STRING,         -- Deprecated
     *         -- possession is proven in this message (which contains the private
     *         -- key itself (encrypted for the CA))
     *        subsequentMessage [1] SubsequentMessage,
     *         -- possession will be proven in a subsequent message
     *        dhMAC             [2] BIT STRING,         -- Deprecated
     *        agreeMAC          [3] PKMACValue,
     *        encryptedKey      [4] EnvelopedData }
     * 
     */
    public DERObject toASN1Object()
    {
        return obj;
    }
}