org.vosao.utils.CipherUtils.java Source code

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Here is the source code for org.vosao.utils.CipherUtils.java

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/**
 * Vosao CMS. Simple CMS for Google App Engine.
 * 
 * Copyright (C) 2009-2011 Vosao development team.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * email: vosao.dev@gmail.com
 */

package org.vosao.utils;

import java.security.NoSuchAlgorithmException;

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

import org.apache.commons.codec.binary.Base64;
import org.apache.commons.codec.binary.Hex;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class CipherUtils {

    private static final Log logger = LogFactory.getLog(CipherUtils.class);

    private static byte[] iv = { 12, 4, 7, 23, 8, 1, 0, 3, 87, 120, 39, 2, 1, 0, 2, 1 };
    private static IvParameterSpec ivspec = new IvParameterSpec(iv);

    public static String encrypt(String data, String password) {
        try {
            byte[] key = new Base64().decode(password);
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(key, "AES"), ivspec);
            byte[] dataBytes = data.getBytes("UTF-8");
            byte[] d = cipher.doFinal(dataBytes);
            return Hex.encodeHexString(d);

        } catch (Exception e) {
            logger.error(e);
        }
        return "";
    }

    public static String decrypt(String data, String password) {
        try {
            byte[] key = new Base64().decode(password);
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(key, "AES"), ivspec);
            byte[] d = (byte[]) new Hex().decode(data);
            byte[] decrypted = cipher.doFinal(d);
            return new String(decrypted, "UTF-8");

        } catch (Exception e) {
            logger.error(e);
        }
        return "";
    }

    public static String generateKey() {
        try {
            KeyGenerator kgen = KeyGenerator.getInstance("AES");
            kgen.init(128);
            return new Base64().encodeToString(kgen.generateKey().getEncoded());
        } catch (NoSuchAlgorithmException e) {
            logger.error("Error generating secret key", e);
            return "";
        }
    }

}