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The jose.4.j library is a robust and easy to use open source implementation of JSON Web Token (JWT) and the JOSE specification suite (JWS, JWE, and JWK). It is written in Java and relies solely on the JCA APIs for cryptography. Please see https://bitbucket.org/b_c/jose4j/wiki/Home for more info, examples, etc..

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/*
 * Copyright 2012-2017 Brian Campbell
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.jose4j.jwe;

import org.jose4j.jca.ProviderContext;
import org.jose4j.jwa.AlgorithmInfo;
import org.jose4j.jwk.EllipticCurveJsonWebKey;
import org.jose4j.jwx.HeaderParameterNames;
import org.jose4j.jwx.Headers;
import org.jose4j.keys.AesKey;
import org.jose4j.keys.KeyPersuasion;
import org.jose4j.lang.ByteUtil;
import org.jose4j.lang.InvalidKeyException;
import org.jose4j.lang.JoseException;

import javax.crypto.spec.SecretKeySpec;
import java.security.Key;

/**
 */
public class EcdhKeyAgreementWithAesKeyWrapAlgorithm extends AlgorithmInfo implements KeyManagementAlgorithm
{
    private AesKeyWrapManagementAlgorithm keyWrap;

    private ContentEncryptionKeyDescriptor keyWrapKeyDescriptor;

    private EcdhKeyAgreementAlgorithm ecdh;

    public EcdhKeyAgreementWithAesKeyWrapAlgorithm(String alg, AesKeyWrapManagementAlgorithm keyWrapAlgorithm)
    {
        setAlgorithmIdentifier(alg);
        setJavaAlgorithm("N/A");
        setKeyType(EllipticCurveJsonWebKey.KEY_TYPE);
        setKeyPersuasion(KeyPersuasion.ASYMMETRIC);
        this.keyWrap = keyWrapAlgorithm;
        this.ecdh = new EcdhKeyAgreementAlgorithm(HeaderParameterNames.ALGORITHM);
        keyWrapKeyDescriptor = new ContentEncryptionKeyDescriptor(keyWrapAlgorithm.getKeyByteLength(), AesKey.ALGORITHM);
    }

    public ContentEncryptionKeys manageForEncrypt(Key managementKey, ContentEncryptionKeyDescriptor cekDesc, Headers headers, byte[] cekOverride, ProviderContext providerContext)
            throws JoseException
    {
        ContentEncryptionKeys agreedKeys = ecdh.manageForEncrypt(managementKey, keyWrapKeyDescriptor, headers, (byte[])null, providerContext);
        String contentEncryptionKeyAlgorithm = keyWrapKeyDescriptor.getContentEncryptionKeyAlgorithm();
        Key agreedKey = new SecretKeySpec(agreedKeys.getContentEncryptionKey(), contentEncryptionKeyAlgorithm);
        return keyWrap.manageForEncrypt(agreedKey, cekDesc, headers, cekOverride, providerContext);
    }

    public Key manageForDecrypt(Key managementKey, byte[] encryptedKey, ContentEncryptionKeyDescriptor cekDesc, Headers headers, ProviderContext providerContext)
            throws JoseException
    {
        Key agreedKey = ecdh.manageForDecrypt(managementKey, ByteUtil.EMPTY_BYTES, keyWrapKeyDescriptor, headers, providerContext);
        return keyWrap.manageForDecrypt(agreedKey, encryptedKey, cekDesc, headers, providerContext);
    }

    @Override
    public void validateEncryptionKey(Key managementKey, ContentEncryptionAlgorithm contentEncryptionAlg) throws InvalidKeyException
    {
        ecdh.validateEncryptionKey(managementKey, contentEncryptionAlg);
    }

    @Override
    public void validateDecryptionKey(Key managementKey, ContentEncryptionAlgorithm contentEncryptionAlg) throws InvalidKeyException
    {
        ecdh.validateDecryptionKey(managementKey, contentEncryptionAlg);
    }

    @Override
    public boolean isAvailable()
    {
        return ecdh.isAvailable() && keyWrap.isAvailable();
    }

    public static class EcdhKeyAgreementWithAes128KeyWrapAlgorithm extends EcdhKeyAgreementWithAesKeyWrapAlgorithm implements KeyManagementAlgorithm
    {
        public EcdhKeyAgreementWithAes128KeyWrapAlgorithm()
        {
            super(KeyManagementAlgorithmIdentifiers.ECDH_ES_A128KW, new AesKeyWrapManagementAlgorithm.Aes128().setUseGeneralProviderContext());
        }
    }

    public static class EcdhKeyAgreementWithAes192KeyWrapAlgorithm extends EcdhKeyAgreementWithAesKeyWrapAlgorithm implements KeyManagementAlgorithm
    {
        public EcdhKeyAgreementWithAes192KeyWrapAlgorithm()
        {
            super(KeyManagementAlgorithmIdentifiers.ECDH_ES_A192KW, new AesKeyWrapManagementAlgorithm.Aes192().setUseGeneralProviderContext());
        }
    }

    public static class EcdhKeyAgreementWithAes256KeyWrapAlgorithm extends EcdhKeyAgreementWithAesKeyWrapAlgorithm implements KeyManagementAlgorithm
    {
        public EcdhKeyAgreementWithAes256KeyWrapAlgorithm()
        {
            super(KeyManagementAlgorithmIdentifiers.ECDH_ES_A256KW, new AesKeyWrapManagementAlgorithm.Aes256().setUseGeneralProviderContext());
        }
    }
}