truelauncher.utils.CryptoUtils.java Source code

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Here is the source code for truelauncher.utils.CryptoUtils.java

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/**
 * 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 truelauncher.utils;

import java.io.IOException;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
import java.util.Enumeration;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

import org.apache.commons.codec.binary.Base64;

public class CryptoUtils {

    private static byte[] ivBytes = new byte[] { 25, 63, 23, 13, 15, 65, 25, 28 };

    public static String decryptString(String string)
            throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException,
            BadPaddingException, ClassNotFoundException, IOException, InvalidAlgorithmParameterException {
        byte[] keyBytes = getKey();
        SecretKeySpec key = new SecretKeySpec(keyBytes, "DES");
        IvParameterSpec ivSpec = new IvParameterSpec(ivBytes);
        Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
        cipher.init(Cipher.DECRYPT_MODE, key, ivSpec);
        String decryptedString = new String(cipher.doFinal(Base64.decodeBase64(string)));
        return decryptedString;
    }

    public static String encryptString(String string)
            throws InvalidKeyException, NoSuchAlgorithmException, NoSuchPaddingException, IllegalBlockSizeException,
            BadPaddingException, IOException, ClassNotFoundException, InvalidAlgorithmParameterException {
        byte[] keyBytes = getKey();
        SecretKeySpec key = new SecretKeySpec(keyBytes, "DES");
        IvParameterSpec ivSpec = new IvParameterSpec(ivBytes);
        Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, key, ivSpec);
        String encryptedString = Base64.encodeBase64String(cipher.doFinal(string.getBytes("UTF8")));
        return encryptedString;
    }

    private static byte[] getKey() throws SocketException {
        Enumeration<NetworkInterface> ni = java.net.NetworkInterface.getNetworkInterfaces();
        if (ni.hasMoreElements()) {
            byte[] mac = ni.nextElement().getHardwareAddress();
            if (mac != null) {
                return Arrays.copyOf(mac, 8);
            } else {
                return "aGorRiaA".getBytes();
            }
        } else {
            return "aGorRiaA".getBytes();
        }
    }

}