org.wattdepot.server.StrongAES.java Source code

Introduction

Here is the source code for org.wattdepot.server.StrongAES.java

Source

/**
 * StrongAES.java This file is part of WattDepot.
 *
 * Copyright (C) 2014  Cam Moore
 *
 * 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 org.wattdepot.server;

import java.security.InvalidKeyException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;

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

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

/**
 * StrongAES a singleton used for encrypting and decrypting user passwords.
 * 
 * @author Cam Moore
 * 
 */
public class StrongAES {

    /** The singleton instance. */
    private static StrongAES instance;

    private Key key;
    private Cipher cipher;
    private String salt;

    /**
     * @throws NoSuchPaddingException if there is a problem.
     * @throws NoSuchAlgorithmException if there is a problem.
     * @throws NoSuchProviderException if there is a problem.
     * 
     */
    private StrongAES() throws NoSuchAlgorithmException, NoSuchPaddingException, NoSuchProviderException {
        String val = System.getenv().get(ServerProperties.WATTDEPOT_SALT_ENV);
        if (val != null) {
            this.salt = val;
        } else {
            this.salt = "Watt2014Depot808";
        }
        this.key = new SecretKeySpec(salt.getBytes(), "AES");
        this.cipher = Cipher.getInstance("AES/ECB/PKCS5Padding", "SunJCE");
    }

    /**
     * @return The singleton StrongAES instance.
     */
    public static StrongAES getInstance() {
        if (instance == null) {
            try {
                instance = new StrongAES();
            } catch (NoSuchAlgorithmException e) {
                e.printStackTrace();
            } catch (NoSuchPaddingException e) {
                e.printStackTrace();
            } catch (NoSuchProviderException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        return instance;
    }

    /**
     * @param plainText the plain text to encrypt.
     * @return the encrypted text.
     */
    public String encrypt(String plainText) {
        String cipherText = null;
        try {
            this.cipher.init(Cipher.ENCRYPT_MODE, this.key);
            cipherText = Base64.encodeBase64String(cipher.doFinal(plainText.getBytes()));
        } catch (InvalidKeyException e) { // NOPMD
            // not sure what to do.
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (BadPaddingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return cipherText;
    }

    /**
     * @param cipherText the encrypted string.
     * @return the decrypted string.
     */
    public String decrypt(String cipherText) {
        String plainText = null;
        try {
            this.cipher.init(Cipher.DECRYPT_MODE, this.key);
            plainText = new String(cipher.doFinal(Base64.decodeBase64(cipherText)));
        } catch (InvalidKeyException e) { // NOPMD
            // not sure what to do.
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (BadPaddingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return plainText;

    }
}