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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 and up.
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package org.bouncycastle.asn1.isismtt.ocsp;

import java.io.IOException;

import org.bouncycastle.asn1.ASN1Choice;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.DERTaggedObject;
import org.bouncycastle.asn1.x509.Certificate;
import org.bouncycastle.util.Arrays;

/**
 * ISIS-MTT-Optional: The certificate requested by the client by inserting the
 * RetrieveIfAllowed extension in the request, will be returned in this
 * extension.
 * 
 * ISIS-MTT-SigG: The signature act allows publishing certificates only then,
 * when the certificate owner gives his explicit permission. Accordingly, there
 * may be �nondownloadable� certificates, about which the responder must provide
 * status information, but MUST NOT include them in the response. Clients may
 * get therefore the following three kind of answers on a single request
 * including the RetrieveIfAllowed extension:
 * 

 *  a) the responder supports the extension and is allowed to publish the
 * certificate: RequestedCertificate returned including the requested
 * certificate
 * 
b) the responder supports the extension but is NOT allowed to publish
 * the certificate: RequestedCertificate returned including an empty OCTET
 * STRING
 * 
c) the responder does not support the extension: RequestedCertificate is
 * not included in the response
 * 
 * Clients requesting RetrieveIfAllowed MUST be able to handle these cases. If
 * any of the OCTET STRING options is used, it MUST contain the DER encoding of
 * the requested certificate.
 *  *            RequestedCertificate ::= CHOICE {
 *              Certificate Certificate,
 *              publicKeyCertificate [0] EXPLICIT OCTET STRING,
 *              attributeCertificate [1] EXPLICIT OCTET STRING
 *            }
 * 
 */
public class RequestedCertificate
    extends ASN1Object
    implements ASN1Choice
{
    public static final int certificate = -1;
    public static final int publicKeyCertificate = 0;
    public static final int attributeCertificate = 1;

    private Certificate cert;
    private byte[] publicKeyCert;
    private byte[] attributeCert;

    public static RequestedCertificate getInstance(Object obj)
    {
        if (obj == null || obj instanceof RequestedCertificate)
        {
            return (RequestedCertificate)obj;
        }

        if (obj instanceof ASN1Sequence)
        {
            return new RequestedCertificate(Certificate.getInstance(obj));
        }
        if (obj instanceof ASN1TaggedObject)
        {
            return new RequestedCertificate((ASN1TaggedObject)obj);
        }

        throw new IllegalArgumentException("illegal object in getInstance: "
            + obj.getClass().getName());
    }

    public static RequestedCertificate getInstance(ASN1TaggedObject obj, boolean explicit)
    {
        if (!explicit)
        {
            throw new IllegalArgumentException("choice item must be explicitly tagged");
        }

        return getInstance(obj.getObject());
    }

    private RequestedCertificate(ASN1TaggedObject tagged)
    {
        if (tagged.getTagNo() == publicKeyCertificate)
        {
            publicKeyCert = ASN1OctetString.getInstance(tagged, true).getOctets();
        }
        else if (tagged.getTagNo() == attributeCertificate)
        {
            attributeCert = ASN1OctetString.getInstance(tagged, true).getOctets();
        }
        else
        {
            throw new IllegalArgumentException("unknown tag number: " + tagged.getTagNo());
        }
    }

    /**
     * Constructor from a given details.
     * 
     * Only one parameter can be given. All other must be null.
     *
     * @param certificate          Given as Certificate
     */
    public RequestedCertificate(Certificate certificate)
    {
        this.cert = certificate;
    }

    public RequestedCertificate(int type, byte[] certificateOctets)
    {
        this(new DERTaggedObject(type, new DEROctetString(certificateOctets)));
    }

    public int getType()
    {
        if (cert != null)
        {
            return certificate;
        }
        if (publicKeyCert != null)
        {
            return publicKeyCertificate;
        }
        return attributeCertificate;
    }

    public byte[] getCertificateBytes()
    {
        if (cert != null)
        {
            try
            {
                return cert.getEncoded();
            }
            catch (IOException e)
            {
                throw new IllegalStateException("can't decode certificate: " + e);
            }
        }
        if (publicKeyCert != null)
        {
            return Arrays.clone(publicKeyCert);
        }
        return Arrays.clone(attributeCert);
    }
    
    /**
     * Produce an object suitable for an ASN1OutputStream.
     * 

     * Returns:
     * 
     *            RequestedCertificate ::= CHOICE {
     *              Certificate Certificate,
     *              publicKeyCertificate [0] EXPLICIT OCTET STRING,
     *              attributeCertificate [1] EXPLICIT OCTET STRING
     *            }
     * 
     *
     * @return a DERObject
     */
    public ASN1Primitive toASN1Primitive()
    {
        if (publicKeyCert != null)
        {
            return new DERTaggedObject(0, new DEROctetString(publicKeyCert));
        }
        if (attributeCert != null)
        {
            return new DERTaggedObject(1, new DEROctetString(attributeCert));
        }
        return cert.toASN1Primitive();
    }
}