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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.

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package org.bouncycastle.asn1.cms;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1Set;
import org.bouncycastle.asn1.BERSequence;
import org.bouncycastle.asn1.BERTaggedObject;
import org.bouncycastle.asn1.DERInteger;
import org.bouncycastle.asn1.DERObject;

public class EncryptedData
    extends ASN1Encodable
{
    private DERInteger version;
    private EncryptedContentInfo encryptedContentInfo;
    private ASN1Set unprotectedAttrs;

    public static EncryptedData getInstance(Object o)
    {
        if (o instanceof EncryptedData)
        {
            return (EncryptedData)o;
        }

        if (o instanceof ASN1Sequence)
        {
            return new EncryptedData((ASN1Sequence)o);
        }

        throw new IllegalArgumentException("Invalid EncryptedData: " + o.getClass().getName());
    }

    public EncryptedData(EncryptedContentInfo encInfo)
    {
        this(encInfo,  null);
    }

    public EncryptedData(EncryptedContentInfo encInfo, ASN1Set unprotectedAttrs)
    {
        this.version = new DERInteger((unprotectedAttrs == null) ? 0 : 2);
        this.encryptedContentInfo = encInfo;
        this.unprotectedAttrs = unprotectedAttrs;
    }

    private EncryptedData(ASN1Sequence seq)
    {
        this.version = DERInteger.getInstance(seq.getObjectAt(0));
        this.encryptedContentInfo = EncryptedContentInfo.getInstance(seq.getObjectAt(1));

        if (seq.size() == 3)
        {
            this.unprotectedAttrs = ASN1Set.getInstance(seq.getObjectAt(2));
        }
    }

    public DERInteger getVersion()
    {
        return version;
    }

    public EncryptedContentInfo getEncryptedContentInfo()
    {
        return encryptedContentInfo;
    }

    public ASN1Set getUnprotectedAttrs()
    {
        return unprotectedAttrs;
    }

    /**
     *      *       EncryptedData ::= SEQUENCE {
     *                     version CMSVersion,
     *                     encryptedContentInfo EncryptedContentInfo,
     *                     unprotectedAttrs [1] IMPLICIT UnprotectedAttributes OPTIONAL }
     * 
     * @return a basic ASN.1 object representation.
     */
    public DERObject toASN1Object()
    {
        ASN1EncodableVector v = new ASN1EncodableVector();

        v.add(version);
        v.add(encryptedContentInfo);
        if (unprotectedAttrs != null)
        {
            v.add(new BERTaggedObject(false, 1, unprotectedAttrs));
        }

        return new BERSequence(v);
    }
}