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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.AlgorithmParameters;
import java.security.GeneralSecurityException;
import java.security.InvalidKeyException;
import java.security.Provider;
import java.security.ProviderException;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.cert.X509Certificate;
import java.util.HashMap;
import java.util.Map;

import javax.crypto.Cipher;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
import org.bouncycastle.jcajce.DefaultJcaJceHelper;
import org.bouncycastle.jcajce.NamedJcaJceHelper;
import org.bouncycastle.jcajce.ProviderJcaJceHelper;
import org.bouncycastle.operator.AsymmetricKeyWrapper;
import org.bouncycastle.operator.GenericKey;
import org.bouncycastle.operator.OperatorException;

public class JceAsymmetricKeyWrapper
    extends AsymmetricKeyWrapper
{
    private OperatorHelper helper = new OperatorHelper(new DefaultJcaJceHelper());
    private Map extraMappings = new HashMap();
    private PublicKey publicKey;
    private SecureRandom random;

    public JceAsymmetricKeyWrapper(PublicKey publicKey)
    {
        super(SubjectPublicKeyInfo.getInstance(publicKey.getEncoded()).getAlgorithm());

        this.publicKey = publicKey;
    }

    public JceAsymmetricKeyWrapper(X509Certificate certificate)
    {
        this(certificate.getPublicKey());
    }

    /**
     * Create a wrapper, overriding the algorithm type that is stored in the public key.
     *
     * @param algorithmIdentifier identifier for encryption algorithm to be used.
     * @param publicKey the public key to be used.
     */
    public JceAsymmetricKeyWrapper(AlgorithmIdentifier algorithmIdentifier, PublicKey publicKey)
    {
        super(algorithmIdentifier);

        this.publicKey = publicKey;
    }

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

        return this;
    }

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

        return this;
    }

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

        return this;
    }

    /**
     * Internally algorithm ids are converted into cipher names using a lookup table. For some providers
     * the standard lookup table won't work. Use this method to establish a specific mapping from an
     * algorithm identifier to a specific algorithm.
     * 
     *     For example:
     * 
     *     unwrapper.setAlgorithmMapping(PKCSObjectIdentifiers.rsaEncryption, "RSA");
     * 
     * 
     * @param algorithm  OID of algorithm in recipient.
     * @param algorithmName JCE algorithm name to use.
     * @return the current Wrapper.
     */
    public JceAsymmetricKeyWrapper setAlgorithmMapping(ASN1ObjectIdentifier algorithm, String algorithmName)
    {
        extraMappings.put(algorithm, algorithmName);

        return this;
    }

    public byte[] generateWrappedKey(GenericKey encryptionKey)
        throws OperatorException
    {
        Cipher keyEncryptionCipher = helper.createAsymmetricWrapper(getAlgorithmIdentifier().getAlgorithm(), extraMappings);
        AlgorithmParameters algParams = helper.createAlgorithmParameters(this.getAlgorithmIdentifier());

        byte[] encryptedKeyBytes = null;

        try
        {
            if (algParams != null)
            {
                keyEncryptionCipher.init(Cipher.WRAP_MODE, publicKey, algParams, random);
            }
            else
            {
                keyEncryptionCipher.init(Cipher.WRAP_MODE, publicKey, random);
            }
            encryptedKeyBytes = keyEncryptionCipher.wrap(OperatorUtils.getJceKey(encryptionKey));
        }
        catch (InvalidKeyException e)
        {
        }
        catch (GeneralSecurityException e)
        {
        }
        catch (IllegalStateException e)
        {
        }
        catch (UnsupportedOperationException e)
        {
        }
        catch (ProviderException e)
        {
        }

        // some providers do not support WRAP (this appears to be only for asymmetric algorithms)
        if (encryptedKeyBytes == null)
        {
            try
            {
                keyEncryptionCipher.init(Cipher.ENCRYPT_MODE, publicKey, random);
                encryptedKeyBytes = keyEncryptionCipher.doFinal(OperatorUtils.getJceKey(encryptionKey).getEncoded());
            }
            catch (InvalidKeyException e)
            {
                throw new OperatorException("unable to encrypt contents key", e);
            }
            catch (GeneralSecurityException e)
            {
                throw new OperatorException("unable to encrypt contents key", e);
            }
        }

        return encryptedKeyBytes;
    }
}