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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 to JDK 1.8.

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package org.bouncycastle.asn1.cms;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.x509.CertificateList;

/**
 * RFC 5544
 * Binding Documents with Time-Stamps; TimeStampAndCRL object.
 *  * TimeStampAndCRL ::= SEQUENCE {
 *     timeStamp   TimeStampToken,          -- according to RFC 3161
 *     crl         CertificateList OPTIONAL -- according to RFC 5280
 *  }
 * 
 */
public class TimeStampAndCRL
    extends ASN1Object
{
    private ContentInfo timeStamp;
    private CertificateList crl;

    public TimeStampAndCRL(ContentInfo timeStamp)
    {
        this.timeStamp = timeStamp;
    }

    private TimeStampAndCRL(ASN1Sequence seq)
    {
        this.timeStamp = ContentInfo.getInstance(seq.getObjectAt(0));
        if (seq.size() == 2)
        {
            this.crl = CertificateList.getInstance(seq.getObjectAt(1));
        }
    }

    /**
     * Return a TimeStampAndCRL object from the given object.
     * 
     * Accepted inputs:
     * 

     *  null → null
     * 
 {@link TimeStampAndCRL} object
     * 
 {@link org.bouncycastle.asn1.ASN1Sequence#getInstance(java.lang.Object) ASN1Sequence} input formats with TimeStampAndCRL structure inside
     * 
     *
     * @param obj the object we want converted.
     * @exception IllegalArgumentException if the object cannot be converted.
     */
    public static TimeStampAndCRL getInstance(Object obj)
    {
        if (obj instanceof TimeStampAndCRL)
        {
            return (TimeStampAndCRL)obj;
        }
        else if (obj != null)
        {
            return new TimeStampAndCRL(ASN1Sequence.getInstance(obj));
        }

        return null;
    }

    public ContentInfo getTimeStampToken()
    {
        return this.timeStamp;
    }

    /** @deprecated use getCRL() */
    public CertificateList getCertificateList()
    {
        return this.crl;
    }

    public CertificateList getCRL()
    {
        return this.crl;
    }

    public ASN1Primitive toASN1Primitive()
    {
        ASN1EncodableVector v = new ASN1EncodableVector(2);

        v.add(timeStamp);

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

        return new DERSequence(v);
    }
}