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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.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;

/**
 * RFC 5652:
 * Content encryption key delivery mechanisms.
 *  
 * RecipientEncryptedKey ::= SEQUENCE {
 *     rid KeyAgreeRecipientIdentifier,
 *     encryptedKey EncryptedKey
 * }
 *


 */
public class RecipientEncryptedKey
    extends ASN1Object
{
    private KeyAgreeRecipientIdentifier identifier;
    private ASN1OctetString encryptedKey;

    private RecipientEncryptedKey(
        ASN1Sequence seq)
    {
        identifier = KeyAgreeRecipientIdentifier.getInstance(seq.getObjectAt(0));
        encryptedKey = (ASN1OctetString)seq.getObjectAt(1);
    }
    
    /**
     * Return an RecipientEncryptedKey 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 RecipientEncryptedKey getInstance(
        ASN1TaggedObject    obj,
        boolean             explicit)
    {
        return getInstance(ASN1Sequence.getInstance(obj, explicit));
    }
    
    /**
     * Return a RecipientEncryptedKey object from the given object.
     *

* Accepted inputs: * * null → null * {@link RecipientEncryptedKey} object * {@link org.bouncycastle.asn1.ASN1Sequence#getInstance(java.lang.Object) ASN1Sequence} input formats with RecipientEncryptedKey structure inside * * * @param obj the object we want converted. * @exception IllegalArgumentException if the object cannot be converted. */ public static RecipientEncryptedKey getInstance( Object obj) { if (obj instanceof RecipientEncryptedKey) { return (RecipientEncryptedKey)obj; } if (obj != null) { return new RecipientEncryptedKey(ASN1Sequence.getInstance(obj)); } return null; } public RecipientEncryptedKey( KeyAgreeRecipientIdentifier id, ASN1OctetString encryptedKey) { this.identifier = id; this.encryptedKey = encryptedKey; } public KeyAgreeRecipientIdentifier getIdentifier() { return identifier; } public ASN1OctetString getEncryptedKey() { return encryptedKey; } /** * Produce an object suitable for an ASN1OutputStream. */ public ASN1Primitive toASN1Primitive() { ASN1EncodableVector v = new ASN1EncodableVector(2); v.add(identifier); v.add(encryptedKey); return new DERSequence(v); } }