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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 and up.

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package org.bouncycastle.asn1.cms;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.BERSequence;
import org.bouncycastle.asn1.DERIA5String;

/**
 * RFC 5544:
 * Binding Documents with Time-Stamps; TimeStampedData object.
 * 
 * 
 * TimeStampedData ::= SEQUENCE {
 *   version              INTEGER { v1(1) },
 *   dataUri              IA5String OPTIONAL,
 *   metaData             MetaData OPTIONAL,
 *   content              OCTET STRING OPTIONAL,
 *   temporalEvidence     Evidence
 * }
 * 
 */
public class TimeStampedData
    extends ASN1Object
{
    private ASN1Integer version;
    private DERIA5String dataUri;
    private MetaData metaData;
    private ASN1OctetString content;
    private Evidence temporalEvidence;

    public TimeStampedData(DERIA5String dataUri, MetaData metaData, ASN1OctetString content, Evidence temporalEvidence)
    {
        this.version = new ASN1Integer(1);
        this.dataUri = dataUri;
        this.metaData = metaData;
        this.content = content;
        this.temporalEvidence = temporalEvidence;
    }

    private TimeStampedData(ASN1Sequence seq)
    {
        this.version = ASN1Integer.getInstance(seq.getObjectAt(0));

        int index = 1;
        if (seq.getObjectAt(index) instanceof DERIA5String)
        {
            this.dataUri = DERIA5String.getInstance(seq.getObjectAt(index++));
        }
        if (seq.getObjectAt(index) instanceof MetaData || seq.getObjectAt(index) instanceof ASN1Sequence)
        {
            this.metaData = MetaData.getInstance(seq.getObjectAt(index++));
        }
        if (seq.getObjectAt(index) instanceof ASN1OctetString)
        {
            this.content = ASN1OctetString.getInstance(seq.getObjectAt(index++));
        }
        this.temporalEvidence = Evidence.getInstance(seq.getObjectAt(index));
    }

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

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

    public DERIA5String getDataUri()
    {
        return dataUri;
    }

    public MetaData getMetaData()
    {
        return metaData;
    }

    public ASN1OctetString getContent()
    {
        return content;
    }

    public Evidence getTemporalEvidence()
    {
        return temporalEvidence;
    }

    public ASN1Primitive toASN1Primitive()
    {
        ASN1EncodableVector v = new ASN1EncodableVector(5);

        v.add(version);

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

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

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

        v.add(temporalEvidence);

        return new BERSequence(v);
    }
}