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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.ASN1Choice;
import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DERTaggedObject;

/**
 * RFC 5652:
 * Content encryption key delivery mechanisms.
 * 
 *  
 * RecipientInfo ::= CHOICE {
 *     ktri      KeyTransRecipientInfo,
 *     kari  [1] KeyAgreeRecipientInfo,
 *     kekri [2] KEKRecipientInfo,
 *     pwri  [3] PasswordRecipientInfo,
 *     ori   [4] OtherRecipientInfo }
 *


 */
public class RecipientInfo
    extends ASN1Object
    implements ASN1Choice
{
    ASN1Encodable    info;

    public RecipientInfo(
        KeyTransRecipientInfo info)
    {
        this.info = info;
    }

    public RecipientInfo(
        KeyAgreeRecipientInfo info)
    {
        this.info = new DERTaggedObject(false, 1, info);
    }

    public RecipientInfo(
        KEKRecipientInfo info)
    {
        this.info = new DERTaggedObject(false, 2, info);
    }

    public RecipientInfo(
        PasswordRecipientInfo info)
    {
        this.info = new DERTaggedObject(false, 3, info);
    }

    public RecipientInfo(
        OtherRecipientInfo info)
    {
        this.info = new DERTaggedObject(false, 4, info);
    }

    public RecipientInfo(
        ASN1Primitive   info)
    {
        this.info = info;
    }

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

* Accepted inputs: * * null → null * {@link RecipientInfo} object * {@link org.bouncycastle.asn1.ASN1Sequence#getInstance(java.lang.Object) ASN1Sequence} input formats with RecipientInfo structure inside * {@link org.bouncycastle.asn1.ASN1TaggedObject#getInstance(java.lang.Object) ASN1TaggedObject} input formats with RecipientInfo structure inside * * * @param o the object we want converted. * @exception IllegalArgumentException if the object cannot be converted. */ public static RecipientInfo getInstance( Object o) { if (o == null || o instanceof RecipientInfo) { return (RecipientInfo)o; } else if (o instanceof ASN1Sequence) { return new RecipientInfo((ASN1Sequence)o); } else if (o instanceof ASN1TaggedObject) { return new RecipientInfo((ASN1TaggedObject)o); } throw new IllegalArgumentException("unknown object in factory: " + o.getClass().getName()); } public ASN1Integer getVersion() { if (info instanceof ASN1TaggedObject) { ASN1TaggedObject o = (ASN1TaggedObject)info; switch (o.getTagNo()) { case 1: return KeyAgreeRecipientInfo.getInstance(o, false).getVersion(); case 2: return getKEKInfo(o).getVersion(); case 3: return PasswordRecipientInfo.getInstance(o, false).getVersion(); case 4: return new ASN1Integer(0); // no syntax version for OtherRecipientInfo default: throw new IllegalStateException("unknown tag"); } } return KeyTransRecipientInfo.getInstance(info).getVersion(); } public boolean isTagged() { return (info instanceof ASN1TaggedObject); } public ASN1Encodable getInfo() { if (info instanceof ASN1TaggedObject) { ASN1TaggedObject o = (ASN1TaggedObject)info; switch (o.getTagNo()) { case 1: return KeyAgreeRecipientInfo.getInstance(o, false); case 2: return getKEKInfo(o); case 3: return PasswordRecipientInfo.getInstance(o, false); case 4: return OtherRecipientInfo.getInstance(o, false); default: throw new IllegalStateException("unknown tag"); } } return KeyTransRecipientInfo.getInstance(info); } private KEKRecipientInfo getKEKInfo(ASN1TaggedObject o) { if (o.isExplicit()) { // compatibilty with erroneous version return KEKRecipientInfo.getInstance(o, true); } else { return KEKRecipientInfo.getInstance(o, false); } } /** * Produce an object suitable for an ASN1OutputStream. */ public ASN1Primitive toASN1Primitive() { return info.toASN1Primitive(); } }