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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.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.ASN1TaggedObject;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.DERTaggedObject;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;

/**
 * RFC 5652:
 * Content encryption key delivery mechanisms.
 *  
 * PasswordRecipientInfo ::= SEQUENCE {
 *     version       CMSVersion,   -- Always set to 0
 *     keyDerivationAlgorithm [0] KeyDerivationAlgorithmIdentifier
 *                             OPTIONAL,
 *     keyEncryptionAlgorithm KeyEncryptionAlgorithmIdentifier,
 *     encryptedKey  EncryptedKey }
 *


 */
public class PasswordRecipientInfo
    extends ASN1Object
{
    private ASN1Integer          version;
    private AlgorithmIdentifier keyDerivationAlgorithm;
    private AlgorithmIdentifier keyEncryptionAlgorithm;
    private ASN1OctetString     encryptedKey;

    public PasswordRecipientInfo(
        AlgorithmIdentifier     keyEncryptionAlgorithm,
        ASN1OctetString         encryptedKey)
    {
        this.version = new ASN1Integer(0);
        this.keyEncryptionAlgorithm = keyEncryptionAlgorithm;
        this.encryptedKey = encryptedKey;
    }
    
    public PasswordRecipientInfo(
        AlgorithmIdentifier     keyDerivationAlgorithm,
        AlgorithmIdentifier     keyEncryptionAlgorithm,
        ASN1OctetString         encryptedKey)
    {
        this.version = new ASN1Integer(0);
        this.keyDerivationAlgorithm = keyDerivationAlgorithm;
        this.keyEncryptionAlgorithm = keyEncryptionAlgorithm;
        this.encryptedKey = encryptedKey;
    }

    /**
     * @deprecated use getInstance() method.
     */
    public PasswordRecipientInfo(
        ASN1Sequence seq)
    {
        version = (ASN1Integer)seq.getObjectAt(0);
        if (seq.getObjectAt(1) instanceof ASN1TaggedObject)
        {
            keyDerivationAlgorithm = AlgorithmIdentifier.getInstance((ASN1TaggedObject)seq.getObjectAt(1), false);
            keyEncryptionAlgorithm = AlgorithmIdentifier.getInstance(seq.getObjectAt(2));
            encryptedKey = (ASN1OctetString)seq.getObjectAt(3);
        }
        else
        {
            keyEncryptionAlgorithm = AlgorithmIdentifier.getInstance(seq.getObjectAt(1));
            encryptedKey = (ASN1OctetString)seq.getObjectAt(2);
        }
    }

    /**
     * Return a PasswordRecipientInfo object from a tagged object.
     *
     * @param obj the tagged object holding the object we want.
     * @param explicit true if the object is meant to be explicitly
     *              tagged false otherwise.
     * @exception IllegalArgumentException if the object held by the
     *          tagged object cannot be converted.
     */
    public static PasswordRecipientInfo getInstance(
        ASN1TaggedObject    obj,
        boolean             explicit)
    {
        return getInstance(ASN1Sequence.getInstance(obj, explicit));
    }
    
    /**
     * Return a PasswordRecipientInfo object from the given object.
     *

* Accepted inputs: * * null → null * {@link PasswordRecipientInfo} object * {@link org.bouncycastle.asn1.ASN1Sequence#getInstance(java.lang.Object) ASN1Sequence} input formats with PasswordRecipientInfo structure inside * * * @param obj the object we want converted. * @exception IllegalArgumentException if the object cannot be converted. */ public static PasswordRecipientInfo getInstance( Object obj) { if (obj instanceof PasswordRecipientInfo) { return (PasswordRecipientInfo)obj; } if (obj != null) { return new PasswordRecipientInfo(ASN1Sequence.getInstance(obj)); } return null; } public ASN1Integer getVersion() { return version; } public AlgorithmIdentifier getKeyDerivationAlgorithm() { return keyDerivationAlgorithm; } public AlgorithmIdentifier getKeyEncryptionAlgorithm() { return keyEncryptionAlgorithm; } public ASN1OctetString getEncryptedKey() { return encryptedKey; } /** * Produce an object suitable for an ASN1OutputStream. */ public ASN1Primitive toASN1Primitive() { ASN1EncodableVector v = new ASN1EncodableVector(4); v.add(version); if (keyDerivationAlgorithm != null) { v.add(new DERTaggedObject(false, 0, keyDerivationAlgorithm)); } v.add(keyEncryptionAlgorithm); v.add(encryptedKey); return new DERSequence(v); } }