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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.crmf;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DERBitString;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.DERTaggedObject;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;

public class EncryptedValue
    extends ASN1Object
{
    private AlgorithmIdentifier intendedAlg;
    private AlgorithmIdentifier symmAlg;
    private DERBitString        encSymmKey;
    private AlgorithmIdentifier keyAlg;
    private ASN1OctetString     valueHint;
    private DERBitString        encValue;

    private EncryptedValue(ASN1Sequence seq)
    {
        int index = 0;
        while (seq.getObjectAt(index) instanceof ASN1TaggedObject)
        {
            ASN1TaggedObject tObj = (ASN1TaggedObject)seq.getObjectAt(index);

            switch (tObj.getTagNo())
            {
            case 0:
                intendedAlg = AlgorithmIdentifier.getInstance(tObj, false);
                break;
            case 1:
                symmAlg = AlgorithmIdentifier.getInstance(tObj, false);
                break;
            case 2:
                encSymmKey = DERBitString.getInstance(tObj, false);
                break;
            case 3:
                keyAlg = AlgorithmIdentifier.getInstance(tObj, false);
                break;
            case 4:
                valueHint = ASN1OctetString.getInstance(tObj, false);
                break;
            default:
                throw new IllegalArgumentException("Unknown tag encountered: " + tObj.getTagNo());
            }
            index++;
        }

        encValue = DERBitString.getInstance(seq.getObjectAt(index));
    }

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

        return null;
    }

    public EncryptedValue(
        AlgorithmIdentifier intendedAlg,
        AlgorithmIdentifier symmAlg,
        DERBitString encSymmKey,
        AlgorithmIdentifier keyAlg,
        ASN1OctetString valueHint,
        DERBitString encValue)
    {
        if (encValue == null)
        {
            throw new IllegalArgumentException("'encValue' cannot be null");
        }

        this.intendedAlg = intendedAlg;
        this.symmAlg = symmAlg;
        this.encSymmKey = encSymmKey;
        this.keyAlg = keyAlg;
        this.valueHint = valueHint;
        this.encValue = encValue;
    }

    public AlgorithmIdentifier getIntendedAlg()
    {
        return intendedAlg;
    }

    public AlgorithmIdentifier getSymmAlg()
    {
        return symmAlg;
    }

    public DERBitString getEncSymmKey()
    {
        return encSymmKey;
    }

    public AlgorithmIdentifier getKeyAlg()
    {
        return keyAlg;
    }

    public ASN1OctetString getValueHint()
    {
        return valueHint;
    }

    public DERBitString getEncValue()
    {
        return encValue;
    }

    /**
     *  
     * EncryptedValue ::= SEQUENCE {
     *                     intendedAlg   [0] AlgorithmIdentifier  OPTIONAL,
     *                     -- the intended algorithm for which the value will be used
     *                     symmAlg       [1] AlgorithmIdentifier  OPTIONAL,
     *                     -- the symmetric algorithm used to encrypt the value
     *                     encSymmKey    [2] BIT STRING           OPTIONAL,
     *                     -- the (encrypted) symmetric key used to encrypt the value
     *                     keyAlg        [3] AlgorithmIdentifier  OPTIONAL,
     *                     -- algorithm used to encrypt the symmetric key
     *                     valueHint     [4] OCTET STRING         OPTIONAL,
     *                     -- a brief description or identifier of the encValue content
     *                     -- (may be meaningful only to the sending entity, and used only
     *                     -- if EncryptedValue might be re-examined by the sending entity
     *                     -- in the future)
     *                     encValue       BIT STRING }
     *                     -- the encrypted value itself
     *


     * @return a basic ASN.1 object representation.
     */
    public ASN1Primitive toASN1Primitive()
    {
        ASN1EncodableVector v = new ASN1EncodableVector(6);

        addOptional(v, 0, intendedAlg);
        addOptional(v, 1, symmAlg);
        addOptional(v, 2, encSymmKey);
        addOptional(v, 3, keyAlg);
        addOptional(v, 4, valueHint);

        v.add(encValue);

        return new DERSequence(v);
    }

    private void addOptional(ASN1EncodableVector v, int tagNo, ASN1Encodable obj)
    {
        if (obj != null)
        {
            v.add(new DERTaggedObject(false, tagNo, obj));
        }
    }
}