/*

 * Copyright (c) 2007, 2015, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

import java.security.AlgorithmParameters;

import java.security.GeneralSecurityException;

import java.security.Provider;

import java.security.Security;

import javax.crypto.SecretKey;

import javax.crypto.Cipher;

import javax.crypto.SecretKeyFactory;

import javax.crypto.spec.PBEKeySpec;

/**

 * Wrapper class to test a given AES-based PBE algorithm.

 */

public class AESPBEWrapper extends AbstractPBEWrapper {

    /**

     * the algorithm parameters.

     */

    private AlgorithmParameters pbeParams;

    /**

     * the encryption key.

     */

    private final SecretKey key;

    /**

     * The Wrapper constructor. Instantiate Cipher using the given AES-based PBE

     * algorithm.

     *

     * @param algo AES-based PBE algorithm.

     * @param passwd password phrase.

     * @throws GeneralSecurityException all security exceptions are thrown.

     */

    public AESPBEWrapper(PBEAlgorithm algo, String passwd)

            throws GeneralSecurityException {

        // salt and iteration count will be generated during encryption

        super(algo, passwd, 0);

        // Generate secret key. We expect no mode and padding specified.

        SecretKeyFactory skf = SecretKeyFactory.getInstance(algo.baseAlgo);

        key = skf.generateSecret(new PBEKeySpec(passwd.toCharArray()));

    }

    /**

     * Initiate the Cipher object using given "mode".

     * @return a cipher object.

     * @throws GeneralSecurityException all security exceptions are thrown.

     */

    @Override

    protected Cipher initCipher(int mode) throws GeneralSecurityException {

        Provider provider = Security.getProvider("SunJCE");

        if (provider == null) {

            throw new RuntimeException("SunJCE provider does not exist.");

        }

        // get Cipher instance

        Cipher ci = Cipher.getInstance(transformation, provider);

        if (Cipher.ENCRYPT_MODE == mode) {

            ci.init(Cipher.ENCRYPT_MODE, key);

            pbeParams = ci.getParameters();

        } else {

            ci.init(Cipher.DECRYPT_MODE, key, pbeParams);

        }

        return ci;

    }

}