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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 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.Provider;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.cert.X509Certificate;
import java.util.HashMap;

import javax.crypto.Cipher;

import org.bouncycastle.asn1.cms.GenericHybridParameters;
import org.bouncycastle.asn1.cms.RsaKemParameters;
import org.bouncycastle.asn1.iso.ISOIECObjectIdentifiers;
import org.bouncycastle.asn1.nist.NISTObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x9.X9ObjectIdentifiers;
import org.bouncycastle.crypto.util.DEROtherInfo;
import org.bouncycastle.jcajce.spec.KTSParameterSpec;
import org.bouncycastle.jcajce.util.DefaultJcaJceHelper;
import org.bouncycastle.jcajce.util.NamedJcaJceHelper;
import org.bouncycastle.jcajce.util.ProviderJcaJceHelper;
import org.bouncycastle.operator.AsymmetricKeyWrapper;
import org.bouncycastle.operator.GenericKey;
import org.bouncycastle.operator.OperatorException;
import org.bouncycastle.util.Arrays;

public class JceKTSKeyWrapper
    extends AsymmetricKeyWrapper
{
    private final String symmetricWrappingAlg;
    private final int keySizeInBits;
    private final byte[] partyUInfo;
    private final byte[] partyVInfo;

    private OperatorHelper helper = new OperatorHelper(new DefaultJcaJceHelper());
    private PublicKey publicKey;
    private SecureRandom random;

    public JceKTSKeyWrapper(PublicKey publicKey, String symmetricWrappingAlg, int keySizeInBits, byte[] partyUInfo, byte[] partyVInfo)
    {
        super(new AlgorithmIdentifier(PKCSObjectIdentifiers.id_rsa_KEM, new GenericHybridParameters(new AlgorithmIdentifier(ISOIECObjectIdentifiers.id_kem_rsa, new RsaKemParameters(new AlgorithmIdentifier(X9ObjectIdentifiers.id_kdf_kdf3, new AlgorithmIdentifier(NISTObjectIdentifiers.id_sha256)), (keySizeInBits + 7) / 8)), JceSymmetricKeyWrapper.determineKeyEncAlg(symmetricWrappingAlg, keySizeInBits))));

        this.publicKey = publicKey;
        this.symmetricWrappingAlg = symmetricWrappingAlg;
        this.keySizeInBits = keySizeInBits;
        this.partyUInfo = Arrays.clone(partyUInfo);
        this.partyVInfo = Arrays.clone(partyVInfo);
    }

    public JceKTSKeyWrapper(X509Certificate certificate, String symmetricWrappingAlg, int keySizeInBits, byte[] partyUInfo, byte[] partyVInfo)
    {
        this(certificate.getPublicKey(), symmetricWrappingAlg, keySizeInBits, partyUInfo, partyVInfo);
    }

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

        return this;
    }

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

        return this;
    }

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

        return this;
    }

    public byte[] generateWrappedKey(GenericKey encryptionKey)
        throws OperatorException
    {
        Cipher keyEncryptionCipher = helper.createAsymmetricWrapper(getAlgorithmIdentifier().getAlgorithm(), new HashMap());

        try
        {
            DEROtherInfo otherInfo = new DEROtherInfo.Builder(JceSymmetricKeyWrapper.determineKeyEncAlg(symmetricWrappingAlg, keySizeInBits), partyUInfo, partyVInfo).build();
            KTSParameterSpec ktsSpec = new KTSParameterSpec.Builder(symmetricWrappingAlg, keySizeInBits, otherInfo.getEncoded()).build();

            keyEncryptionCipher.init(Cipher.WRAP_MODE, publicKey, ktsSpec, random);

            return keyEncryptionCipher.wrap(OperatorUtils.getJceKey(encryptionKey));
        }
        catch (Exception e)
        {
            throw new OperatorException("Unable to wrap contents key: " + e.getMessage(), e);
        }
    }
}