info.bonjean.beluga.util.CryptoUtil.java Source code

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Here is the source code for info.bonjean.beluga.util.CryptoUtil.java

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/*
 * Copyright (C) 2012, 2013, 2014 Julien Bonjean <julien@bonjean.info>
 * 
 * This file is part of Beluga Player.
 * 
 * This program 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.
 * 
 * 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 General Public License for more
 * details.
 * 
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 51
 * Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */
package info.bonjean.beluga.util;

import java.util.HashMap;
import java.util.Map;

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;

import org.apache.commons.codec.DecoderException;
import org.apache.commons.codec.binary.Base64;
import org.apache.commons.codec.binary.Hex;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * 
 * @author Julien Bonjean <julien@bonjean.info>
 * 
 */
public class CryptoUtil {
    private static final Logger log = LoggerFactory.getLogger(CryptoUtil.class);

    private static final Map<String, Cipher> encryptCiphers = new HashMap<String, Cipher>();
    private static final Map<String, Cipher> decryptCiphers = new HashMap<String, Cipher>();

    private static final String ENCRYPT_KEY = "6#26FRL$ZWD";
    private static final String DECRYPT_KEY = "R=U!LH$O2B#";

    private static Cipher getCipher(String strKey, boolean encoder) {
        Cipher cipher = null;
        if (encoder)
            cipher = encryptCiphers.get(strKey);
        else
            cipher = decryptCiphers.get(strKey);

        if (cipher != null)
            return cipher;

        try {
            SecretKeySpec key = new SecretKeySpec(strKey.getBytes(), "Blowfish");
            cipher = Cipher.getInstance("Blowfish/ECB/NoPadding");
            cipher.init(encoder ? Cipher.ENCRYPT_MODE : Cipher.DECRYPT_MODE, key);

            if (encoder)
                encryptCiphers.put(strKey, cipher);
            else
                decryptCiphers.put(strKey, cipher);
        } catch (Exception e) {
            log.error(e.getMessage(), e);
        }

        return cipher;
    }

    public static String passwordDecrypt(String text, String strKey) {
        return new String(decryptBlowfish(Base64.decodeBase64(text.getBytes()), strKey)).trim();
    }

    public static String passwordEncrypt(String text, String strKey) {
        return new String(Base64.encodeBase64(encryptBlowfish(text, strKey)));
    }

    public static String pandoraDecrypt(String text) {
        try {
            return new String(decryptBlowfish(Hex.decodeHex(text.toCharArray()), DECRYPT_KEY)).trim();
        } catch (DecoderException e) {
            log.error(e.getMessage(), e);
            return null;
        }
    }

    public static String pandoraEncrypt(String text) {
        return new String(Hex.encodeHex(encryptBlowfish(text, ENCRYPT_KEY)));
    }

    public static byte[] encryptBlowfish(String strToEncrypt, String strKey) {
        if (strToEncrypt == null || strToEncrypt.isEmpty())
            return new byte[] {};

        byte[] toEncrypt = strToEncrypt.getBytes();

        // padding with null bytes if not a multiple of 8
        if (toEncrypt.length % 8 != 0) {
            byte[] padded = new byte[toEncrypt.length + 8 - (toEncrypt.length % 8)];
            System.arraycopy(toEncrypt, 0, padded, 0, toEncrypt.length);
            toEncrypt = padded;
        }

        try {
            return getCipher(strKey, true).doFinal(toEncrypt);
        } catch (Exception e) {
            // TODO: throw the exception, should be handled in higher layers
            log.error(e.getMessage(), e);
            return new byte[] {};
        }
    }

    public static byte[] decryptBlowfish(byte[] strToDecrypt, String strKey) {
        if (strToDecrypt == null || strToDecrypt.length == 0)
            return new byte[] {};

        byte[] decrypt = strToDecrypt;// .getBytes();

        try {
            return getCipher(strKey, false).doFinal(decrypt);
        } catch (Exception e) {
            // TODO: throw the exception, should be handled in higher layers
            log.error(e.getMessage(), e);
            return new byte[] {};
        }
    }
}