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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 1.8 and up. The APIs are designed primarily to be used in conjunction with the BC LTS provider but may also be used with other providers providing cryptographic services.

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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.params.KeyParameter;
import org.bouncycastle.operator.InputDecryptor;
import org.bouncycastle.operator.bc.BcSymmetricKeyUnwrapper;

public class BcKEKEnvelopedRecipient
    extends BcKEKRecipient
{
    public BcKEKEnvelopedRecipient(BcSymmetricKeyUnwrapper unwrapper)
    {
        super(unwrapper);
    }

    public RecipientOperator getRecipientOperator(AlgorithmIdentifier keyEncryptionAlgorithm, final AlgorithmIdentifier contentEncryptionAlgorithm, byte[] encryptedContentEncryptionKey)
        throws CMSException
    {
        KeyParameter secretKey = (KeyParameter)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 dataOut)
            {
                if (dataCipher instanceof BufferedBlockCipher)
                {
                    return new org.bouncycastle.crypto.io.CipherInputStream(dataOut, (BufferedBlockCipher)dataCipher);
                }
                else
                {
                    return new org.bouncycastle.crypto.io.CipherInputStream(dataOut, (StreamCipher)dataCipher);
                }
            }
        });
    }
}