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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.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.BERSequence;
import org.bouncycastle.asn1.BERTaggedObject;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;

/**
 * RFC 5652 EncryptedContentInfo object.
 *
 *  
 * EncryptedContentInfo ::= SEQUENCE {
 *     contentType ContentType,
 *     contentEncryptionAlgorithm ContentEncryptionAlgorithmIdentifier,
 *     encryptedContent [0] IMPLICIT EncryptedContent OPTIONAL 
 * }
 *


 */
public class EncryptedContentInfo
    extends ASN1Object
{
    private ASN1ObjectIdentifier contentType;
    private AlgorithmIdentifier contentEncryptionAlgorithm;
    private ASN1OctetString     encryptedContent;
    
    public EncryptedContentInfo(
        ASN1ObjectIdentifier contentType, 
        AlgorithmIdentifier contentEncryptionAlgorithm,
        ASN1OctetString     encryptedContent)
    {
        this.contentType = contentType;
        this.contentEncryptionAlgorithm = contentEncryptionAlgorithm;
        this.encryptedContent = encryptedContent;
    }
    
    private EncryptedContentInfo(
        ASN1Sequence seq)
    {
        if (seq.size() < 2)
        {
            throw new IllegalArgumentException("Truncated Sequence Found");
        }

        contentType = (ASN1ObjectIdentifier)seq.getObjectAt(0);
        contentEncryptionAlgorithm = AlgorithmIdentifier.getInstance(
                                                        seq.getObjectAt(1));
        if (seq.size() > 2)
        {
            encryptedContent = ASN1OctetString.getInstance(
                                (ASN1TaggedObject)seq.getObjectAt(2), false);
        }
    }

    /**
     * Return an EncryptedContentInfo object from the given object.
     *

* Accepted inputs: * * null → null * {@link EncryptedContentInfo} object * {@link org.bouncycastle.asn1.ASN1Sequence#getInstance(java.lang.Object) ASN1Sequence} input formats * * * @param obj the object we want converted. * @exception IllegalArgumentException if the object cannot be converted. */ public static EncryptedContentInfo getInstance( Object obj) { if (obj instanceof EncryptedContentInfo) { return (EncryptedContentInfo)obj; } if (obj != null) { return new EncryptedContentInfo(ASN1Sequence.getInstance(obj)); } return null; } public ASN1ObjectIdentifier getContentType() { return contentType; } public AlgorithmIdentifier getContentEncryptionAlgorithm() { return contentEncryptionAlgorithm; } public ASN1OctetString getEncryptedContent() { return encryptedContent; } /** * Produce an object suitable for an ASN1OutputStream. */ public ASN1Primitive toASN1Primitive() { ASN1EncodableVector v = new ASN1EncodableVector(3); v.add(contentType); v.add(contentEncryptionAlgorithm); if (encryptedContent != null) { v.add(new BERTaggedObject(false, 0, encryptedContent)); } return new BERSequence(v); } }