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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 1.5.

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package org.bouncycastle.asn1.cmp;

import org.bouncycastle.asn1.ASN1Choice;
import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DERObject;
import org.bouncycastle.asn1.x509.X509CertificateStructure;

public class CMPCertificate
    extends ASN1Encodable
    implements ASN1Choice
{
    private X509CertificateStructure x509v3PKCert;

    public CMPCertificate(X509CertificateStructure x509v3PKCert)
    {
        if (x509v3PKCert.getVersion() != 3)
        {
            throw new IllegalArgumentException("only version 3 certificates allowed");
        }

        this.x509v3PKCert = x509v3PKCert;
    }

    public static CMPCertificate getInstance(Object o)
    {
        if (o instanceof CMPCertificate)
        {
            return (CMPCertificate)o;
        }

        if (o instanceof X509CertificateStructure)
        {
            return new CMPCertificate((X509CertificateStructure)o);
        }

        if (o instanceof ASN1Sequence)
        {
            return new CMPCertificate(X509CertificateStructure.getInstance(o));
        }

        throw new IllegalArgumentException("Invalid object: " + o.getClass().getName());
    }

    public X509CertificateStructure getX509v3PKCert()
    {
        return x509v3PKCert;
    }

    /**
     *      * CMPCertificate ::= CHOICE {
     *            x509v3PKCert        Certificate
     *  }
     * 
     * @return a basic ASN.1 object representation.
     */
    public DERObject toASN1Object()
    {
        return x509v3PKCert.toASN1Object();
    }
}