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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.bc;

import java.math.BigInteger;
import java.util.Date;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1GeneralizedTime;
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.ASN1UTF8String;
import org.bouncycastle.asn1.DERGeneralizedTime;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.DERUTF8String;
import org.bouncycastle.util.Arrays;

/**
 *  * ObjectData ::= SEQUENCE {
 *     type             INTEGER,
 *     identifier       UTF8String,
 *     creationDate     GeneralizedTime,
 *     lastModifiedDate GeneralizedTime,
 *     data             OCTET STRING,
 *     comment          UTF8String OPTIONAL
 * }
 * 
 */
public class ObjectData
    extends ASN1Object
{
    private final BigInteger          type;
    private final String              identifier;
    private final ASN1GeneralizedTime creationDate;
    private final ASN1GeneralizedTime lastModifiedDate;
    private final ASN1OctetString data;
    private final String              comment;

    private ObjectData(ASN1Sequence seq)
    {
        this.type = ASN1Integer.getInstance(seq.getObjectAt(0)).getValue();
        this.identifier = ASN1UTF8String.getInstance(seq.getObjectAt(1)).getString();
        this.creationDate = ASN1GeneralizedTime.getInstance(seq.getObjectAt(2));
        this.lastModifiedDate = ASN1GeneralizedTime.getInstance(seq.getObjectAt(3));
        this.data = ASN1OctetString.getInstance(seq.getObjectAt(4));
        this.comment = (seq.size() == 6) ? ASN1UTF8String.getInstance(seq.getObjectAt(5)).getString() : null;
    }

    public ObjectData(BigInteger type, String identifier, Date creationDate, Date lastModifiedDate, byte[] data, String comment)
    {
        this.type = type;
        this.identifier = identifier;
        this.creationDate = new DERGeneralizedTime(creationDate);
        this.lastModifiedDate = new DERGeneralizedTime(lastModifiedDate);
        this.data = new DEROctetString(Arrays.clone(data));
        this.comment = comment;
    }

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

        return null;
    }

    public String getComment()
    {
        return comment;
    }

    public ASN1GeneralizedTime getCreationDate()
    {
        return creationDate;
    }

    public byte[] getData()
    {
        return Arrays.clone(data.getOctets());
    }

    public String getIdentifier()
    {
        return identifier;
    }

    public ASN1GeneralizedTime getLastModifiedDate()
    {
        return lastModifiedDate;
    }

    public BigInteger getType()
    {
        return type;
    }

    public ASN1Primitive toASN1Primitive()
    {
        ASN1EncodableVector v = new ASN1EncodableVector(6);

        v.add(new ASN1Integer(type));
        v.add(new DERUTF8String(identifier));
        v.add(creationDate);
        v.add(lastModifiedDate);
        v.add(data);

        if (comment != null)
        {
            v.add(new DERUTF8String(comment));
        }

        return new DERSequence(v);
    }
}