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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.bc;

import java.security.SecureRandom;

import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.crypto.InvalidCipherTextException;
import org.bouncycastle.crypto.Wrapper;
import org.bouncycastle.crypto.params.KeyParameter;
import org.bouncycastle.operator.GenericKey;
import org.bouncycastle.operator.OperatorException;
import org.bouncycastle.operator.SymmetricKeyUnwrapper;

public class BcSymmetricKeyUnwrapper
    extends SymmetricKeyUnwrapper
{
    private SecureRandom random;
    private Wrapper wrapper;
    private KeyParameter wrappingKey;

    public BcSymmetricKeyUnwrapper(AlgorithmIdentifier wrappingAlgorithm, Wrapper wrapper, KeyParameter wrappingKey)
    {
        super(wrappingAlgorithm);

        this.wrapper = wrapper;
        this.wrappingKey = wrappingKey;
    }

    public BcSymmetricKeyUnwrapper setSecureRandom(SecureRandom random)
    {
        this.random = random;

        return this;
    }

    public GenericKey generateUnwrappedKey(AlgorithmIdentifier encryptedKeyAlgorithm, byte[] encryptedKey)
        throws OperatorException
    {
        wrapper.init(false, wrappingKey);

        try
        {
            return new GenericKey(encryptedKeyAlgorithm, wrapper.unwrap(encryptedKey, 0, encryptedKey.length));
        }
        catch (InvalidCipherTextException e)
        {
            throw new OperatorException("unable to unwrap key: " + e.getMessage(), e);
        }
    }
}