com.friendconnect.utils.Encrypter.java Source code

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Here is the source code for com.friendconnect.utils.Encrypter.java

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/*   **********************************************************************  **
 **   Copyright notice                                                       **
 **                                                                          **
 **   (c) 2009, FriendConnect                                             **
 **   All rights reserved.                                                   **
 **                                                                          **
 **     This program and the accompanying materials are made available under   **
 **   the terms of the GPLv3 license which accompanies this                 **
 **   distribution. A copy is found in the textfile LICENSE.txt             **
 **                                                                          **
 **   This copyright notice MUST APPEAR in all copies of the file!           **
 **                                                                          **
 **   Main developers:                                                       **
 **     Juri Strumpflohner      http://blog.js-development.com                **
 **     Matthias Braunhofer      http://matthias.jimdo.com                    **
 **                                                                          **
 **  **********************************************************************  */

package com.friendconnect.utils;

import org.bouncycastle.crypto.BufferedBlockCipher;
import org.bouncycastle.crypto.CryptoException;
import org.bouncycastle.crypto.engines.RijndaelEngine;
import org.bouncycastle.crypto.modes.CBCBlockCipher;
import org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher;
import org.bouncycastle.crypto.params.KeyParameter;

/**
 * Utility class that can be used to encrypt/decrypt passwords.
 */
public class Encrypter {

    private String key = "abc123abc123abcd"; //note: this key must match the client-side key
    private BufferedBlockCipher cipher;

    public Encrypter() {
        RijndaelEngine engine = new RijndaelEngine();
        CBCBlockCipher c = new CBCBlockCipher(engine);
        cipher = new PaddedBufferedBlockCipher(c);
    }

    public byte[] encryptPassword(String pass) {
        byte[] password = pass.getBytes();
        cipher.init(true, new KeyParameter(key.getBytes()));
        byte[] encryptedPassword = new byte[cipher.getOutputSize(password.length)];

        int size = cipher.processBytes(password, 0, password.length, encryptedPassword, 0);
        try {
            cipher.doFinal(encryptedPassword, size);
        } catch (CryptoException ce) {
            System.out.println("Encryption failed");
        }
        return encryptedPassword;

    }

    public String performDecrypt(byte[] cipherText) {
        cipher.init(false, new KeyParameter(key.getBytes()));

        byte[] rv = new byte[cipher.getOutputSize(cipherText.length)];

        int oLen = cipher.processBytes(cipherText, 0, cipherText.length, rv, 0);
        try {
            cipher.doFinal(rv, oLen);
        } catch (CryptoException ce) {
            System.out.println("dencryption failed");
        }
        return new String(rv).trim();
    }

}