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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.crmf;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DERInteger;
import org.bouncycastle.asn1.DERObject;
import org.bouncycastle.asn1.DERSequence;

public class CertRequest
    extends ASN1Encodable
{
    private DERInteger certReqId;
    private CertTemplate certTemplate;
    private Controls controls;

    private CertRequest(ASN1Sequence seq)
    {
        certReqId = DERInteger.getInstance(seq.getObjectAt(0));
        certTemplate = CertTemplate.getInstance(seq.getObjectAt(1));
        if (seq.size() > 2)
        {
            controls = Controls.getInstance(seq.getObjectAt(2));
        }
    }

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

        if (o instanceof ASN1Sequence)
        {
            return new CertRequest((ASN1Sequence)o);
        }

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

    public DERInteger getCertReqId()
    {
        return certReqId;
    }

    public CertTemplate getCertTemplate()
    {
        return certTemplate;
    }

    public Controls getControls()
    {
        return controls;
    }

    /**
     *      * CertRequest ::= SEQUENCE {
     *                      certReqId     INTEGER,          -- ID for matching request and reply
     *                      certTemplate  CertTemplate,  -- Selected fields of cert to be issued
     *                      controls      Controls OPTIONAL }   -- Attributes affecting issuance
     * 
     * @return a basic ASN.1 object representation.
     */
    public DERObject toASN1Object()
    {
        ASN1EncodableVector v = new ASN1EncodableVector();

        v.add(certReqId);
        v.add(certTemplate);

        if (controls != null)
        {
            v.add(controls);
        }

        return new DERSequence(v);
    }
}