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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.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DERBitString;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;

/**
 * RFC 5652:
 * Content encryption key delivery mechanisms.
 * 
 *  
 * OriginatorPublicKey ::= SEQUENCE {
 *     algorithm AlgorithmIdentifier,
 *     publicKey BIT STRING 
 * }
 *


 */
public class OriginatorPublicKey
    extends ASN1Object
{
    private AlgorithmIdentifier algorithm;
    private DERBitString        publicKey;
    
    public OriginatorPublicKey(
        AlgorithmIdentifier algorithm,
        byte[]              publicKey)
    {
        this.algorithm = algorithm;
        this.publicKey = new DERBitString(publicKey);
    }

    /**
     * @deprecated use getInstance()
     */
    public OriginatorPublicKey(
        ASN1Sequence seq)
    {
        algorithm = AlgorithmIdentifier.getInstance(seq.getObjectAt(0));
        publicKey = (DERBitString)seq.getObjectAt(1);
    }
    
    /**
     * Return an OriginatorPublicKey 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 OriginatorPublicKey getInstance(
        ASN1TaggedObject    obj,
        boolean             explicit)
    {
        return getInstance(ASN1Sequence.getInstance(obj, explicit));
    }
    
    /**
     * Return an OriginatorPublicKey object from the given object.
     *

* Accepted inputs: * * null → null * {@link OriginatorPublicKey} object * {@link org.bouncycastle.asn1.ASN1Sequence#getInstance(java.lang.Object) ASN1Sequence} input formats with OriginatorPublicKey structure inside * * * @param obj the object we want converted. * @exception IllegalArgumentException if the object cannot be converted. */ public static OriginatorPublicKey getInstance( Object obj) { if (obj instanceof OriginatorPublicKey) { return (OriginatorPublicKey)obj; } if (obj != null) { return new OriginatorPublicKey(ASN1Sequence.getInstance(obj)); } return null; } public AlgorithmIdentifier getAlgorithm() { return algorithm; } public DERBitString getPublicKey() { return publicKey; } /** * Produce an object suitable for an ASN1OutputStream. */ public ASN1Primitive toASN1Primitive() { ASN1EncodableVector v = new ASN1EncodableVector(2); v.add(algorithm); v.add(publicKey); return new DERSequence(v); } }