/*
* RapidMiner
*
* Copyright (C) 2001-2008 by Rapid-I and the contributors
*
* Complete list of developers available at our web site:
*
* http://rapid-i.com
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see http://www.gnu.org/licenses/.
*/
package com.rapidminer.tools.cipher;
import java.io.IOException;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
/**
* This class can be used to encrypt and decrypt given strings
* based on a key generated by the user. Please note that classes
* using this tool class should first ensure that a user key is available
* by invoking the method isKeyAvailable().
*
* @author Ingo Mierswa
* @version $Id: CipherTools.java,v 1.5 2008/05/09 19:23:26 ingomierswa Exp $
*/
public class CipherTools {
private static final String CIPHER_TYPE = "DESede";
public static boolean isKeyAvailable() {
try {
KeyGeneratorTool.getUserKey();
return true;
} catch (IOException e) {
return false;
}
}
public static String encrypt(String text) throws CipherException {
Key key = null;
try {
key = KeyGeneratorTool.getUserKey();
} catch (IOException e) {
throw new CipherException("Cannot retrieve key, probably no one was created: " + e.getMessage());
}
try {
Cipher cipher = Cipher.getInstance(CIPHER_TYPE);
cipher.init(Cipher.ENCRYPT_MODE, key);
byte[] outputBytes = cipher.doFinal(text.getBytes());
BASE64Encoder encoder = new BASE64Encoder();
String base64 = encoder.encode(outputBytes);
return base64;
} catch (NoSuchAlgorithmException e) {
throw new CipherException( "Failed to encrypt text: " + e.getMessage());
} catch (NoSuchPaddingException e) {
throw new CipherException( "Failed to encrypt text: " + e.getMessage());
} catch (InvalidKeyException e) {
throw new CipherException( "Failed to encrypt text: " + e.getMessage());
} catch (IllegalBlockSizeException e) {
throw new CipherException( "Failed to encrypt text: " + e.getMessage());
} catch (BadPaddingException e) {
throw new CipherException( "Failed to encrypt text: " + e.getMessage());
}
}
public static String decrypt(String text) throws CipherException {
Key key = null;
try {
key = KeyGeneratorTool.getUserKey();
} catch (IOException e) {
throw new CipherException("Cannot retrieve key, probably no one was created: " + e.getMessage());
}
try {
BASE64Decoder decoder = new BASE64Decoder();
byte[] encrypted = decoder.decodeBuffer(text);
Cipher cipher = Cipher.getInstance(CIPHER_TYPE);
cipher.init(Cipher.DECRYPT_MODE, key);
byte[] outputBytes = cipher.doFinal(encrypted);
String ret = new String(outputBytes);
return ret;
} catch (NoSuchAlgorithmException e) {
throw new CipherException( "Failed to decrypt text: " + e.getMessage());
} catch (NoSuchPaddingException e) {
throw new CipherException( "Failed to decrypt text: " + e.getMessage());
} catch (IOException e) {
throw new CipherException( "Failed to decrypt text: " + e.getMessage());
} catch (InvalidKeyException e) {
throw new CipherException( "Failed to decrypt text: " + e.getMessage());
} catch (IllegalBlockSizeException e) {
throw new CipherException( "Failed to decrypt text: " + e.getMessage());
} catch (BadPaddingException e) {
throw new CipherException( "Failed to decrypt text: " + e.getMessage());
}
}
}