Java String Decode decode(String s)

Description

decode

License

Open Source License

Declaration

public static String decode(String s) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * HELIUM V, Open Source ERP software for sustained success
 * at small and medium-sized enterprises.
 * Copyright (C) 2004 - 2014 HELIUM V IT-Solutions GmbH
 * /* w  w  w  .  ja va 2s .c o m*/
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published 
 * by the Free Software Foundation, either version 3 of theLicense, or 
 * (at your option) any later version.
 * 
 * According to sec. 7 of the GNU Affero General Public License, version 3, 
 * the terms of the AGPL are supplemented with the following terms:
 * 
 * "HELIUM V" and "HELIUM 5" are registered trademarks of 
 * HELIUM V IT-Solutions GmbH. The licensing of the program under the 
 * AGPL does not imply a trademark license. Therefore any rights, title and
 * interest in our trademarks remain entirely with us. If you want to propagate
 * modified versions of the Program under the name "HELIUM V" or "HELIUM 5",
 * you may only do so if you have a written permission by HELIUM V IT-Solutions 
 * GmbH (to acquire a permission please contact HELIUM V IT-Solutions
 * at trademark@heliumv.com).
 * 
 * This program 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 Affero General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 * 
 * Contact: developers@heliumv.com
 ******************************************************************************/

import java.io.IOException;

import sun.misc.BASE64Decoder;

public class Main {
    public static String decode(String s) {
        if (s != null) {
            return new String(xorWithKey(base64Decode(s),
                    "HELIUMV".getBytes()));
        } else {
            return null;
        }
    }

    private static byte[] xorWithKey(byte[] a, byte[] key) {
        byte[] out = new byte[a.length];
        for (int i = 0; i < a.length; i++) {
            out[i] = (byte) (a[i] ^ key[i % key.length]);
        }
        return out;
    }

    private static byte[] base64Decode(String s) {
        try {
            BASE64Decoder d = new BASE64Decoder();
            return d.decodeBuffer(s);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}

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