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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 1.5 to JDK 1.8. 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.CipherParameters;
import org.bouncycastle.crypto.StreamCipher;
import org.bouncycastle.crypto.io.CipherInputStream;
import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
import org.bouncycastle.operator.InputDecryptor;

public class BcRSAKeyTransEnvelopedRecipient
    extends BcKeyTransRecipient
{
    public BcRSAKeyTransEnvelopedRecipient(AsymmetricKeyParameter key)
    {
        super(key);
    }

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

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

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

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