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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.x509.AlgorithmIdentifier;

/**
 * RFC 5652:
 * Content encryption key delivery mechanisms.
 * 
 *  
 * KEKRecipientInfo ::= SEQUENCE {
 *     version CMSVersion,  -- always set to 4
 *     kekid KEKIdentifier,
 *     keyEncryptionAlgorithm KeyEncryptionAlgorithmIdentifier,
 *     encryptedKey EncryptedKey 
 * }
 *


 */
public class KEKRecipientInfo
    extends ASN1Object
{
    private ASN1Integer          version;
    private KEKIdentifier       kekid;
    private AlgorithmIdentifier keyEncryptionAlgorithm;
    private ASN1OctetString     encryptedKey;

    public KEKRecipientInfo(
        KEKIdentifier       kekid,
        AlgorithmIdentifier keyEncryptionAlgorithm,
        ASN1OctetString     encryptedKey)
    {
        this.version = new ASN1Integer(4);
        this.kekid = kekid;
        this.keyEncryptionAlgorithm = keyEncryptionAlgorithm;
        this.encryptedKey = encryptedKey;
    }
    
    public KEKRecipientInfo(
        ASN1Sequence seq)
    {
        version = (ASN1Integer)seq.getObjectAt(0);
        kekid = KEKIdentifier.getInstance(seq.getObjectAt(1));
        keyEncryptionAlgorithm = AlgorithmIdentifier.getInstance(seq.getObjectAt(2));
        encryptedKey = (ASN1OctetString)seq.getObjectAt(3);
    }

    /**
     * Return a KEKRecipientInfo 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 KEKRecipientInfo getInstance(
        ASN1TaggedObject    obj,
        boolean             explicit)
    {
        return getInstance(ASN1Sequence.getInstance(obj, explicit));
    }
    
    /**
     * Return a KEKRecipientInfo object from the given object.
     *

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