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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.
 *  
 * KeyTransRecipientInfo ::= SEQUENCE {
 *     version CMSVersion,  -- always set to 0 or 2
 *     rid RecipientIdentifier,
 *     keyEncryptionAlgorithm KeyEncryptionAlgorithmIdentifier,
 *     encryptedKey EncryptedKey 
 * }
 *


 */
public class KeyTransRecipientInfo
    extends ASN1Object
{
    private ASN1Integer          version;
    private RecipientIdentifier rid;
    private AlgorithmIdentifier keyEncryptionAlgorithm;
    private ASN1OctetString     encryptedKey;

    public KeyTransRecipientInfo(
        RecipientIdentifier rid,
        AlgorithmIdentifier keyEncryptionAlgorithm,
        ASN1OctetString     encryptedKey)
    {
        if (rid.toASN1Primitive() instanceof ASN1TaggedObject)
        {
            this.version = new ASN1Integer(2);
        }
        else
        {
            this.version = new ASN1Integer(0);
        }

        this.rid = rid;
        this.keyEncryptionAlgorithm = keyEncryptionAlgorithm;
        this.encryptedKey = encryptedKey;
    }

    /**
     * @deprecated use getInstance()
     */
    public KeyTransRecipientInfo(
        ASN1Sequence seq)
    {
        this.version = (ASN1Integer)seq.getObjectAt(0);
        this.rid = RecipientIdentifier.getInstance(seq.getObjectAt(1));
        this.keyEncryptionAlgorithm = AlgorithmIdentifier.getInstance(seq.getObjectAt(2));
        this.encryptedKey = (ASN1OctetString)seq.getObjectAt(3);
    }

    /**
     * Return a KeyTransRecipientInfo object from the given object.
     *

* Accepted inputs: * * null → null * {@link KeyTransRecipientInfo} object * {@link org.bouncycastle.asn1.ASN1Sequence#getInstance(java.lang.Object) ASN1Sequence} input formats with KeyTransRecipientInfo structure inside * * * @param obj the object we want converted. * @exception IllegalArgumentException if the object cannot be converted. */ public static KeyTransRecipientInfo getInstance( Object obj) { if (obj instanceof KeyTransRecipientInfo) { return (KeyTransRecipientInfo)obj; } if(obj != null) { return new KeyTransRecipientInfo(ASN1Sequence.getInstance(obj)); } return null; } public ASN1Integer getVersion() { return version; } public RecipientIdentifier getRecipientIdentifier() { return rid; } 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); v.add(rid); v.add(keyEncryptionAlgorithm); v.add(encryptedKey); return new DERSequence(v); } }