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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 and up. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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package org.bouncycastle.asn1.cmp;

import java.util.Enumeration;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.DERTaggedObject;

public class KeyRecRepContent
    extends ASN1Object
{
    private PKIStatusInfo status;
    private CMPCertificate newSigCert;
    private ASN1Sequence caCerts;
    private ASN1Sequence keyPairHist;

    private KeyRecRepContent(ASN1Sequence seq)
    {
        Enumeration en = seq.getObjects();

        status = PKIStatusInfo.getInstance(en.nextElement());

        while (en.hasMoreElements())
        {
            ASN1TaggedObject tObj = ASN1TaggedObject.getInstance(en.nextElement());

            switch (tObj.getTagNo())
            {
            case 0:
                newSigCert = CMPCertificate.getInstance(tObj.getObject());
                break;
            case 1:
                caCerts = ASN1Sequence.getInstance(tObj.getObject());
                break;
            case 2:
                keyPairHist = ASN1Sequence.getInstance(tObj.getObject());
                break;
            default:
                throw new IllegalArgumentException("unknown tag number: " + tObj.getTagNo());
            }
        }
    }

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

        if (o != null)
        {
            return new KeyRecRepContent(ASN1Sequence.getInstance(o));
        }

        return null;
    }


    public PKIStatusInfo getStatus()
    {
        return status;
    }

    public CMPCertificate getNewSigCert()
    {
        return newSigCert;
    }

    public CMPCertificate[] getCaCerts()
    {
        if (caCerts == null)
        {
            return null;
        }

        CMPCertificate[] results = new CMPCertificate[caCerts.size()];

        for (int i = 0; i != results.length; i++)
        {
            results[i] = CMPCertificate.getInstance(caCerts.getObjectAt(i));
        }

        return results;
    }

    public CertifiedKeyPair[] getKeyPairHist()
    {
        if (keyPairHist == null)
        {
            return null;
        }

        CertifiedKeyPair[] results = new CertifiedKeyPair[keyPairHist.size()];

        for (int i = 0; i != results.length; i++)
        {
            results[i] = CertifiedKeyPair.getInstance(keyPairHist.getObjectAt(i));
        }

        return results;
    }

    /**
     *      * KeyRecRepContent ::= SEQUENCE {
     *                         status                  PKIStatusInfo,
     *                         newSigCert          [0] CMPCertificate OPTIONAL,
     *                         caCerts             [1] SEQUENCE SIZE (1..MAX) OF
     *                                                           CMPCertificate OPTIONAL,
     *                         keyPairHist         [2] SEQUENCE SIZE (1..MAX) OF
     *                                                           CertifiedKeyPair OPTIONAL
     *              }
     *  
     * @return a basic ASN.1 object representation.
     */
    public ASN1Primitive toASN1Primitive()
    {
        ASN1EncodableVector v = new ASN1EncodableVector(4);

        v.add(status);

        addOptional(v, 0, newSigCert);
        addOptional(v, 1, caCerts);
        addOptional(v, 2, keyPairHist);

        return new DERSequence(v);
    }

    private void addOptional(ASN1EncodableVector v, int tagNo, ASN1Encodable obj)
    {
        if (obj != null)
        {
            v.add(new DERTaggedObject(true, tagNo, obj));
        }
    }
}