org.keycloak.jose.jwe.alg.AesKeyWrapAlgorithmProvider Maven / Gradle / Ivy
/*
* Copyright 2017 Red Hat, Inc. and/or its affiliates
* and other contributors as indicated by the @author tags.
*
* 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.keycloak.jose.jwe.alg;
import java.security.Key;
import org.bouncycastle.crypto.Wrapper;
import org.bouncycastle.crypto.engines.AESWrapEngine;
import org.bouncycastle.crypto.params.KeyParameter;
import org.keycloak.jose.jwe.JWEKeyStorage;
import org.keycloak.jose.jwe.enc.JWEEncryptionProvider;
/**
* @author Marek Posolda
*/
public class AesKeyWrapAlgorithmProvider implements JWEAlgorithmProvider {
@Override
public byte[] decodeCek(byte[] encodedCek, Key encryptionKey) throws Exception {
Wrapper encrypter = new AESWrapEngine();
encrypter.init(false, new KeyParameter(encryptionKey.getEncoded()));
return encrypter.unwrap(encodedCek, 0, encodedCek.length);
}
@Override
public byte[] encodeCek(JWEEncryptionProvider encryptionProvider, JWEKeyStorage keyStorage, Key encryptionKey) throws Exception {
Wrapper encrypter = new AESWrapEngine();
encrypter.init(true, new KeyParameter(encryptionKey.getEncoded()));
byte[] cekBytes = keyStorage.getCekBytes();
return encrypter.wrap(cekBytes, 0, cekBytes.length);
}
}