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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.operator.bc;

import java.security.SecureRandom;

import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.crypto.Wrapper;
import org.bouncycastle.crypto.params.KeyParameter;
import org.bouncycastle.crypto.params.ParametersWithRandom;
import org.bouncycastle.operator.GenericKey;
import org.bouncycastle.operator.OperatorException;
import org.bouncycastle.operator.SymmetricKeyWrapper;

public class BcSymmetricKeyWrapper
    extends SymmetricKeyWrapper
{
    private SecureRandom random;
    private Wrapper wrapper;
    private KeyParameter wrappingKey;

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

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

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

        return this;
    }

    public byte[] generateWrappedKey(GenericKey encryptionKey)
        throws OperatorException
    {
        byte[] contentEncryptionKeySpec = OperatorUtils.getKeyBytes(encryptionKey);

        if (random == null)
        {
            wrapper.init(true, wrappingKey);
        }
        else
        {
            wrapper.init(true, new ParametersWithRandom(wrappingKey, random));
        }

        return wrapper.wrap(contentEncryptionKeySpec, 0, contentEncryptionKeySpec.length);
    }
}