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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 1.4.

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package org.bouncycastle.asn1.cms;

import org.bouncycastle.asn1.ASN1Choice;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DERTaggedObject;
import org.bouncycastle.asn1.tsp.EvidenceRecord;

/**
 * RFC 5544:
 * Binding Documents with Time-Stamps; Evidence object.
 * 
 *  
 * Evidence ::= CHOICE {
 *     tstEvidence    [0] TimeStampTokenEvidence,   -- see RFC 3161
 *     ersEvidence    [1] EvidenceRecord,           -- see RFC 4998
 *     otherEvidence  [2] OtherEvidence
 * }
 *


 */
public class Evidence
    extends ASN1Object
    implements ASN1Choice
{
    private TimeStampTokenEvidence tstEvidence;
    private EvidenceRecord ersEvidence;
    private ASN1Sequence otherEvidence;

    public Evidence(TimeStampTokenEvidence tstEvidence)
    {
        this.tstEvidence = tstEvidence;
    }

    public Evidence(EvidenceRecord ersEvidence)
    {
        this.ersEvidence = ersEvidence;
    }

    private Evidence(ASN1TaggedObject tagged)
    {
        if (tagged.getTagNo() == 0)
        {
            this.tstEvidence = TimeStampTokenEvidence.getInstance(tagged, false);
        }
        else if (tagged.getTagNo() == 1)
        {
            this.ersEvidence = EvidenceRecord.getInstance(tagged, false);
        }
        else if (tagged.getTagNo() == 2)
        {
            this.otherEvidence = ASN1Sequence.getInstance(tagged, false);
        }
        else
        {
            throw new IllegalArgumentException("unknown tag in Evidence");
        }
    }

    /**
     * Return an Evidence object from the given object.
     *

* Accepted inputs: * * {@link Evidence} object * {@link org.bouncycastle.asn1.ASN1TaggedObject#getInstance(java.lang.Object) ASN1TaggedObject} input formats with Evidence data inside * * * @param obj the object we want converted. * @exception IllegalArgumentException if the object cannot be converted. */ public static Evidence getInstance(Object obj) { if (obj == null || obj instanceof Evidence) { return (Evidence)obj; } else if (obj instanceof ASN1TaggedObject) { return new Evidence(ASN1TaggedObject.getInstance(obj)); } throw new IllegalArgumentException("unknown object in getInstance"); } public static Evidence getInstance( ASN1TaggedObject obj, boolean explicit) { return getInstance(obj.getObject()); // must be explicitly tagged } public TimeStampTokenEvidence getTstEvidence() { return tstEvidence; } public EvidenceRecord getErsEvidence() { return ersEvidence; } public ASN1Primitive toASN1Primitive() { if (tstEvidence != null) { return new DERTaggedObject(false, 0, tstEvidence); } if (ersEvidence != null) { return new DERTaggedObject(false, 1, ersEvidence); } return new DERTaggedObject(false, 2, otherEvidence); } }