edu.wright.cs.sp16.ceg3120.util.PasswordEncryptionUtility.java Source code

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Here is the source code for edu.wright.cs.sp16.ceg3120.util.PasswordEncryptionUtility.java

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/*
 * Copyright (C) 2016
 * 
 * 
 * 
 *
 * 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, see <http://www.gnu.org/licenses/>.
 *
 */

package edu.wright.cs.sp16.ceg3120.util;

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

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

/**
 * PasswordEncryptionService class handles the password encryption. It uses
 * PBKDF2 to encrypt and decrypt clear text.
 */
public class PasswordEncryptionUtility {

    private static String initVector = "zGPDuuc7RfWJPz3t";
    private static String key = "vQ2bEnvgEehv23H9";

    /**
     * Encrypts a given string using AES.
     * 
     * @param value
     *            // String to encrypt.
     * @return // Returns encrypted string.
     */
    public static String encrypt(String value) {
        try {
            IvParameterSpec iv = new IvParameterSpec(initVector.getBytes("UTF-8"));
            SecretKeySpec skeySpec = new SecretKeySpec(key.getBytes("UTF-8"), "AES");

            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
            cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);

            byte[] encrypted = cipher.doFinal(value.getBytes("UTF-8"));
            System.out.println("encrypted string: " + Base64.encodeBase64String(encrypted));

            return Base64.encodeBase64String(encrypted);
        } catch (RuntimeException e) {
            throw e;
        } catch (Exception ex) {
            ex.printStackTrace();
        }

        return null;
    }

    /**
     * Decrypts a given string using AES.
     * 
     * @param encrypted
     *            // Encrypted string.
     * @return // Returns decrypted string.
     */
    public static String decrypt(String encrypted) {
        try {
            IvParameterSpec iv = new IvParameterSpec(initVector.getBytes("UTF-8"));
            SecretKeySpec skeySpec = new SecretKeySpec(key.getBytes("UTF-8"), "AES");

            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
            cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);

            byte[] original = cipher.doFinal(Base64.decodeBase64(encrypted));
            System.out.println("Decrypted Password: " + new String(original, "UTF-8"));
            return new String(original, "UTF-8");
        } catch (RuntimeException e) {
            throw e;
        } catch (Exception ex) {
            ex.printStackTrace();
        }

        return null;
    }

}