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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.bc;

import java.io.InputStream;

import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.cms.CMSException;
import org.bouncycastle.cms.RecipientOperator;
import org.bouncycastle.crypto.BufferedBlockCipher;
import org.bouncycastle.crypto.StreamCipher;
import org.bouncycastle.crypto.io.CipherInputStream;
import org.bouncycastle.crypto.params.KeyParameter;
import org.bouncycastle.operator.InputDecryptor;

public class BcPasswordEnvelopedRecipient
    extends BcPasswordRecipient
{
    public BcPasswordEnvelopedRecipient(char[] password)
    {
        super(password);
    }

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

        final Object dataCipher = EnvelopedDataHelper.createContentCipher(false, secretKey, contentEncryptionAlgorithm);

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

            public InputStream getInputStream(InputStream dataOut)
            {
                if (dataCipher instanceof BufferedBlockCipher)
                {
                    return new CipherInputStream(dataOut, (BufferedBlockCipher)dataCipher);
                }
                else
                {
                    return new CipherInputStream(dataOut, (StreamCipher)dataCipher);
                }
            }
        });
    }
}