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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.
 * 
 *  
 * KeyAgreeRecipientInfo ::= SEQUENCE {
 *     version CMSVersion,  -- always set to 3
 *     originator [0] EXPLICIT OriginatorIdentifierOrKey,
 *     ukm [1] EXPLICIT UserKeyingMaterial OPTIONAL,
 *     keyEncryptionAlgorithm KeyEncryptionAlgorithmIdentifier,
 *     recipientEncryptedKeys RecipientEncryptedKeys 
 * }
 *
 * UserKeyingMaterial ::= OCTET STRING
 *


 */
public class KeyAgreeRecipientInfo
    extends ASN1Object
{
    private ASN1Integer                  version;
    private OriginatorIdentifierOrKey   originator;
    private ASN1OctetString             ukm;
    private AlgorithmIdentifier         keyEncryptionAlgorithm;
    private ASN1Sequence                recipientEncryptedKeys;
    
    public KeyAgreeRecipientInfo(
        OriginatorIdentifierOrKey   originator,
        ASN1OctetString             ukm,
        AlgorithmIdentifier         keyEncryptionAlgorithm,
        ASN1Sequence                recipientEncryptedKeys)
    {
        this.version = new ASN1Integer(3);
        this.originator = originator;
        this.ukm = ukm;
        this.keyEncryptionAlgorithm = keyEncryptionAlgorithm;
        this.recipientEncryptedKeys = recipientEncryptedKeys;
    }

    /**
     * @deprecated use getInstance()
     */
    public KeyAgreeRecipientInfo(
        ASN1Sequence seq)
    {
        int index = 0;
        
        version = (ASN1Integer)seq.getObjectAt(index++);
        originator = OriginatorIdentifierOrKey.getInstance(
                            (ASN1TaggedObject)seq.getObjectAt(index++), true);

        if (seq.getObjectAt(index) instanceof ASN1TaggedObject)
        {
            ukm = ASN1OctetString.getInstance(
                            (ASN1TaggedObject)seq.getObjectAt(index++), true);
        }

        keyEncryptionAlgorithm = AlgorithmIdentifier.getInstance(
                                                seq.getObjectAt(index++));

        recipientEncryptedKeys = (ASN1Sequence)seq.getObjectAt(index++);
    }
    
    /**
     * Return a KeyAgreeRecipientInfo 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 KeyAgreeRecipientInfo getInstance(
        ASN1TaggedObject    obj,
        boolean             explicit)
    {
        return getInstance(ASN1Sequence.getInstance(obj, explicit));
    }
    
    /**
     * Return a KeyAgreeRecipientInfo object from the given object.
     *

* Accepted inputs: * * null → null * {@link KeyAgreeRecipientInfo} object * {@link org.bouncycastle.asn1.ASN1Sequence#getInstance(java.lang.Object) ASN1Sequence} input formats with KeyAgreeRecipientInfo structure inside * * * @param obj the object we want converted. * @exception IllegalArgumentException if the object cannot be converted. */ public static KeyAgreeRecipientInfo getInstance( Object obj) { if (obj instanceof KeyAgreeRecipientInfo) { return (KeyAgreeRecipientInfo)obj; } if (obj != null) { return new KeyAgreeRecipientInfo(ASN1Sequence.getInstance(obj)); } return null; } public ASN1Integer getVersion() { return version; } public OriginatorIdentifierOrKey getOriginator() { return originator; } public ASN1OctetString getUserKeyingMaterial() { return ukm; } public AlgorithmIdentifier getKeyEncryptionAlgorithm() { return keyEncryptionAlgorithm; } public ASN1Sequence getRecipientEncryptedKeys() { return recipientEncryptedKeys; } /** * Produce an object suitable for an ASN1OutputStream. */ public ASN1Primitive toASN1Primitive() { ASN1EncodableVector v = new ASN1EncodableVector(5); v.add(version); v.add(new DERTaggedObject(true, 0, originator)); if (ukm != null) { v.add(new DERTaggedObject(true, 1, ukm)); } v.add(keyEncryptionAlgorithm); v.add(recipientEncryptedKeys); return new DERSequence(v); } }