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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 java.io.IOException;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1SequenceParser;
import org.bouncycastle.asn1.ASN1TaggedObjectParser;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;

/**
 * Parser for RFC 5652 EncryptedContentInfo object.
 * 
 * 
 * EncryptedContentInfo ::= SEQUENCE {
 *     contentType ContentType,
 *     contentEncryptionAlgorithm ContentEncryptionAlgorithmIdentifier,
 *     encryptedContent [0] IMPLICIT EncryptedContent OPTIONAL 
 * }
 * 
 */
public class EncryptedContentInfoParser
{
    private ASN1ObjectIdentifier    _contentType;
    private AlgorithmIdentifier     _contentEncryptionAlgorithm;
    private ASN1TaggedObjectParser _encryptedContent;

    public EncryptedContentInfoParser(
        ASN1SequenceParser  seq) 
        throws IOException
    {
        _contentType = (ASN1ObjectIdentifier)seq.readObject();
        _contentEncryptionAlgorithm = AlgorithmIdentifier.getInstance(seq.readObject().toASN1Primitive());
        _encryptedContent = (ASN1TaggedObjectParser)seq.readObject();
    }
    
    public ASN1ObjectIdentifier getContentType()
    {
        return _contentType;
    }
    
    public AlgorithmIdentifier getContentEncryptionAlgorithm()
    {
        return _contentEncryptionAlgorithm;
    }

    public ASN1Encodable getEncryptedContent(
        int  tag) 
        throws IOException
    {
        return _encryptedContent.getObjectParser(tag, false);
    }
}