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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.operator.jcajce;

import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.Provider;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;

import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.jcajce.util.DefaultJcaJceHelper;
import org.bouncycastle.jcajce.util.NamedJcaJceHelper;
import org.bouncycastle.jcajce.util.ProviderJcaJceHelper;
import org.bouncycastle.operator.GenericKey;
import org.bouncycastle.operator.OperatorException;
import org.bouncycastle.operator.SymmetricKeyUnwrapper;

public class JceSymmetricKeyUnwrapper
    extends SymmetricKeyUnwrapper
{
    private OperatorHelper helper = new OperatorHelper(new DefaultJcaJceHelper());
    private SecretKey secretKey;

    public JceSymmetricKeyUnwrapper(AlgorithmIdentifier algorithmIdentifier, SecretKey secretKey)
    {
        super(algorithmIdentifier);

        this.secretKey = secretKey;
    }

    public JceSymmetricKeyUnwrapper setProvider(Provider provider)
    {
        this.helper = new OperatorHelper(new ProviderJcaJceHelper(provider));

        return this;
    }

    public JceSymmetricKeyUnwrapper setProvider(String providerName)
    {
        this.helper = new OperatorHelper(new NamedJcaJceHelper(providerName));

        return this;
    }

    public GenericKey generateUnwrappedKey(AlgorithmIdentifier encryptedKeyAlgorithm, byte[] encryptedKey)
        throws OperatorException
    {
        try
        {
            Cipher keyCipher = helper.createSymmetricWrapper(this.getAlgorithmIdentifier().getAlgorithm());

            keyCipher.init(Cipher.UNWRAP_MODE, secretKey);

            return new JceGenericKey(encryptedKeyAlgorithm, keyCipher.unwrap(encryptedKey, helper.getKeyAlgorithmName(encryptedKeyAlgorithm.getAlgorithm()), Cipher.SECRET_KEY));
        }
        catch (InvalidKeyException e)
        {
            throw new OperatorException("key invalid in message.", e);
        }
        catch (NoSuchAlgorithmException e)
        {
            throw new OperatorException("can't find algorithm.", e);
        }
    }
}