//    uniCenta oPOS  - Touch Friendly Point Of Sale
//    Copyright (c) 2009-2017 uniCenta
//    https://unicenta.com
//
//    This file is part of uniCenta oPOS
//
//    uniCenta oPOS is free software: you can redistribute it and/or modify
//    it under the terms of the GNU General Public License as published by
//    the Free Software Foundation, either version 3 of the License, or
//    (at your option) any later version.
//
//   uniCenta oPOS 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 for more details.
//
//    You should have received a copy of the GNU General Public License
//    along with uniCenta oPOS.  If not, see <http://www.gnu.org/licenses/>.

package com.unicenta.pos.util;

import java.io.UnsupportedEncodingException;
import java.security.*;
import javax.crypto.*;

/**
 *
 * @author JG uniCenta
 */
public class AltEncrypter {
    
    private Cipher cipherDecrypt;
    private Cipher cipherEncrypt;
    
    /** Creates a new instance of Encrypter
     * @param passPhrase */
    public AltEncrypter(String passPhrase) {

        try {
            SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");
            sr.setSeed(passPhrase.getBytes("UTF8"));
            KeyGenerator kGen = KeyGenerator.getInstance("DESEDE");
            kGen.init(168, sr);
            Key key = kGen.generateKey();

            cipherEncrypt = Cipher.getInstance("DESEDE/ECB/PKCS5Padding");
            cipherEncrypt.init(Cipher.ENCRYPT_MODE, key);
            
            cipherDecrypt = Cipher.getInstance("DESEDE/ECB/PKCS5Padding");
            cipherDecrypt.init(Cipher.DECRYPT_MODE, key);
        } catch (UnsupportedEncodingException | NoSuchPaddingException 
                | NoSuchAlgorithmException | InvalidKeyException e) {
        }
    }
    
    /**
     *
     * @param str
     * @return
     */
    public String encrypt(String str) {
        try {
            return StringUtils.byte2hex(cipherEncrypt.doFinal(str.getBytes("UTF8")));
        } catch (UnsupportedEncodingException | BadPaddingException 
                | IllegalBlockSizeException e) {
        }
        return null;
    }
    
    /**
     *
     * @param str
     * @return
     */
    public String decrypt(String str) {
        try {
            return new String(cipherDecrypt.doFinal(StringUtils.hex2byte(str)), "UTF8");
        } catch (UnsupportedEncodingException | BadPaddingException | IllegalBlockSizeException e) {
       
        }
        return null;
    }    
}
