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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.ocsp;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Enumerated;
import org.bouncycastle.asn1.ASN1GeneralizedTime;
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;
import org.bouncycastle.asn1.x509.CRLReason;

public class RevokedInfo
    extends ASN1Object
{
    private ASN1GeneralizedTime  revocationTime;
    private CRLReason           revocationReason;

    public RevokedInfo(
        ASN1GeneralizedTime  revocationTime,
        CRLReason           revocationReason)
    {
        this.revocationTime = revocationTime;
        this.revocationReason = revocationReason;
    }

    private RevokedInfo(
        ASN1Sequence    seq)
    {
        this.revocationTime = ASN1GeneralizedTime.getInstance(seq.getObjectAt(0));

        if (seq.size() > 1)
        {
            this.revocationReason = CRLReason.getInstance(ASN1Enumerated.getInstance(
                (ASN1TaggedObject)seq.getObjectAt(1), true));
        }
    }

    public static RevokedInfo getInstance(
        ASN1TaggedObject obj,
        boolean          explicit)
    {
        return getInstance(ASN1Sequence.getInstance(obj, explicit));
    }

    public static RevokedInfo getInstance(
        Object  obj)
    {
        if (obj instanceof RevokedInfo)
        {
            return (RevokedInfo)obj;
        }
        else if (obj != null)
        {
            return new RevokedInfo(ASN1Sequence.getInstance(obj));
        }

        return null;
    }

    public ASN1GeneralizedTime getRevocationTime()
    {
        return revocationTime;
    }

    public CRLReason getRevocationReason()
    {
        return revocationReason;
    }

    /**
     * Produce an object suitable for an ASN1OutputStream.
     *      * RevokedInfo ::= SEQUENCE {
     *      revocationTime              GeneralizedTime,
     *      revocationReason    [0]     EXPLICIT CRLReason OPTIONAL }
     * 
     */
    public ASN1Primitive toASN1Primitive()
    {
        ASN1EncodableVector v = new ASN1EncodableVector(2);

        v.add(revocationTime);
        if (revocationReason != null)
        {
            v.add(new DERTaggedObject(true, 0, revocationReason));
        }

        return new DERSequence(v);
    }
}