/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2008, Red Hat Middleware LLC, and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.gatein.portal.encoder;

import java.io.UnsupportedEncodingException;
import java.security.GeneralSecurityException;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;

import org.gatein.common.util.Base64;

// import org.picketlink.identity.federation.core.util.Base64;

/**
 * Utility dealing with Password Based Encryption
 * (Code is ripped off of the PBEUtils class in JBossSecurity/PicketBox)
 * @author Scott.Stark@jboss.org
 * @author Anil.Saldhana@redhat.com
 * @since May 25, 2010
 */
public class PBEUtils {

    public static byte[] encode(byte[] secret, String cipherAlgorithm,
            SecretKey cipherKey, PBEParameterSpec cipherSpec)
            throws Exception {
            Cipher cipher = Cipher.getInstance(cipherAlgorithm);
            cipher.init(Cipher.ENCRYPT_MODE, cipherKey, cipherSpec);
            byte[] encoding = cipher.doFinal(secret);
            return encoding;
         }

         public static String encode64(byte[] secret, String cipherAlgorithm,
            SecretKey cipherKey, PBEParameterSpec cipherSpec)
            throws Exception {
            byte[] encoding = encode(secret, cipherAlgorithm, cipherKey, cipherSpec);
            String b64 = Base64.encodeBytes( encoding );
            return b64;
         }

         public static byte[] decode(byte[] secret, String cipherAlgorithm,
            SecretKey cipherKey, PBEParameterSpec cipherSpec) throws GeneralSecurityException {
            Cipher cipher = Cipher.getInstance(cipherAlgorithm);
            cipher.init(Cipher.DECRYPT_MODE, cipherKey, cipherSpec);
            byte[] decode = cipher.doFinal(secret);
            return decode;
         }

         public static String decode64(String secret, String cipherAlgorithm,
            SecretKey cipherKey, PBEParameterSpec cipherSpec)  throws GeneralSecurityException, UnsupportedEncodingException {
            byte[] encoding = Base64.decode( secret );
            byte[] decode = decode(encoding, cipherAlgorithm, cipherKey, cipherSpec);
            return new String(decode, "UTF-8");
         }

         public static void main(String[] args) throws Exception {
            if( args.length != 3 ) {
               System.err.println(
                 "Encrypt a password"
                + "Usage: PBEUtils salt count domain-password password"
                +" salt : the Salt "
                +" count : the IterationCount "
                +" password : the plaintext password that should be encrypted"
               );
               throw new RuntimeException( " ERROR: please see format above" );
            }

            byte[] salt = args[0].substring(0, 8).getBytes();
            int count = Integer.parseInt(args[1]);
            char[] password = "somearbitrarycrazystringthatdoesnotmatter".toCharArray();
            byte[] passwordToEncode = args[2].getBytes("UTF-8");
            PBEParameterSpec cipherSpec = new PBEParameterSpec(salt, count);
            PBEKeySpec keySpec = new PBEKeySpec(password);
            SecretKeyFactory factory = SecretKeyFactory.getInstance("PBEwithMD5andDES");
            SecretKey cipherKey = factory.generateSecret(keySpec);
            String encodedPassword = encode64(passwordToEncode, "PBEwithMD5andDES",
               cipherKey, cipherSpec);
            System.err.println("Encoded password: MASK-"+encodedPassword);
         }
}
