StrongAES.java
/**
* 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.
* @throws java.security.InvalidKeyException if there is a problem.
* @throws javax.crypto.BadPaddingException if there is a problem.
* @throws javax.crypto.IllegalBlockSizeException if there is a problem.
*/
public String decrypt(String cipherText) throws InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
String plainText = null;
this.cipher.init(Cipher.DECRYPT_MODE, this.key);
plainText = new String(cipher.doFinal(Base64.decodeBase64(cipherText)));
return plainText;
}
}