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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.4. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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package org.bouncycastle.cms.jcajce;

import java.io.IOException;
import java.io.InputStream;
import java.security.Key;
import java.security.PrivateKey;

import javax.crypto.Cipher;

import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.cms.CMSException;
import org.bouncycastle.cms.KeyTransRecipientId;
import org.bouncycastle.cms.RecipientOperator;
import org.bouncycastle.jcajce.io.CipherInputStream;
import org.bouncycastle.operator.InputDecryptor;

/**
 * the KeyTransRecipient class for a recipient who has been sent secret
 * key material encrypted using their public key that needs to be used to
 * derive a key and extract a message.
 */
public class JceKTSKeyTransEnvelopedRecipient
    extends JceKTSKeyTransRecipient
{
    public JceKTSKeyTransEnvelopedRecipient(PrivateKey recipientKey, KeyTransRecipientId recipientId)
        throws IOException
    {
        super(recipientKey, getPartyVInfoFromRID(recipientId));
    }

    public RecipientOperator getRecipientOperator(AlgorithmIdentifier keyEncryptionAlgorithm, final AlgorithmIdentifier contentEncryptionAlgorithm, byte[] encryptedContentEncryptionKey)
        throws CMSException
    {
        Key secretKey = extractSecretKey(keyEncryptionAlgorithm, contentEncryptionAlgorithm, encryptedContentEncryptionKey);

        final Cipher dataCipher = contentHelper.createContentCipher(secretKey, contentEncryptionAlgorithm);

        return new RecipientOperator(new InputDecryptor()
        {
            public AlgorithmIdentifier getAlgorithmIdentifier()
            {
                return contentEncryptionAlgorithm;
            }

            public InputStream getInputStream(InputStream dataIn)
            {
                return new CipherInputStream(dataIn, dataCipher);
            }
        });
    }
}