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/**
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* aagtl Advanced Geocaching Tool for Android
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* loosely based on agtl by Daniel Fett <fett@danielfett.de>
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* Copyright (C) 2010 - 2012 Zoff.cc <aagtl@work.zoff.cc>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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package com.zoffcc.applications.aagtl;
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import java.io.IOException;
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import java.io.UnsupportedEncodingException;
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import java.security.InvalidAlgorithmParameterException;
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import java.security.InvalidKeyException;
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import java.security.NoSuchAlgorithmException;
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import java.security.spec.AlgorithmParameterSpec;
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import java.security.spec.InvalidKeySpecException;
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import java.security.spec.KeySpec;
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import javax.crypto.BadPaddingException;
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import javax.crypto.Cipher;
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import javax.crypto.IllegalBlockSizeException;
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import javax.crypto.NoSuchPaddingException;
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import javax.crypto.SecretKey;
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import javax.crypto.SecretKeyFactory;
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import javax.crypto.spec.PBEKeySpec;
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import javax.crypto.spec.PBEParameterSpec;
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public class StringEnc
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{
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Cipher ecipher;
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Cipher dcipher;
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/**
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* Constructor used to create this object. Responsible for setting
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* and initializing this object's encrypter and decrypter Chipher instances
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* given a Secret Key and algorithm.
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*
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* @param key
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* Secret Key used to initialize both the encrypter and
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* decrypter instances.
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* @param algorithm
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* Which algorithm to use for creating the encrypter and
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* decrypter instances.
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*/
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StringEnc(SecretKey key, String algorithm)
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{
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try
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{
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ecipher = Cipher.getInstance(algorithm);
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dcipher = Cipher.getInstance(algorithm);
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ecipher.init(Cipher.ENCRYPT_MODE, key);
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dcipher.init(Cipher.DECRYPT_MODE, key);
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}
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catch (NoSuchPaddingException e)
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{
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System.out.println("EXCEPTION: NoSuchPaddingException");
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}
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catch (NoSuchAlgorithmException e)
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{
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System.out.println("EXCEPTION: NoSuchAlgorithmException");
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}
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catch (InvalidKeyException e)
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{
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System.out.println("EXCEPTION: InvalidKeyException");
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}
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}
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/**
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* Constructor used to create this object. Responsible for setting
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* and initializing this object's encrypter and decrypter Chipher instances
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* given a Pass Phrase and algorithm.
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*
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* @param passPhrase
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* Pass Phrase used to initialize both the encrypter and
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* decrypter instances.
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*/
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StringEnc(String passPhrase)
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{
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// 8-bytes Salt
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byte[] salt = {(byte) 0xA9, (byte) 0x9B, (byte) 0xC8, (byte) 0x32, (byte) 0x56, (byte) 0x34,
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(byte) 0xE3, (byte) 0x03};
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// Iteration count
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int iterationCount = 19;
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try
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{
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KeySpec keySpec = new PBEKeySpec(passPhrase.toCharArray(), salt, iterationCount);
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SecretKey key = SecretKeyFactory.getInstance("PBEWithMD5AndDES").generateSecret(keySpec);
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ecipher = Cipher.getInstance(key.getAlgorithm());
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dcipher = Cipher.getInstance(key.getAlgorithm());
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// Prepare the parameters to the cipthers
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AlgorithmParameterSpec paramSpec = new PBEParameterSpec(salt, iterationCount);
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ecipher.init(Cipher.ENCRYPT_MODE, key, paramSpec);
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dcipher.init(Cipher.DECRYPT_MODE, key, paramSpec);
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}
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catch (InvalidAlgorithmParameterException e)
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{
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System.out.println("EXCEPTION: InvalidAlgorithmParameterException");
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}
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catch (InvalidKeySpecException e)
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{
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System.out.println("EXCEPTION: InvalidKeySpecException");
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}
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catch (NoSuchPaddingException e)
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{
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System.out.println("EXCEPTION: NoSuchPaddingException");
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}
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catch (NoSuchAlgorithmException e)
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{
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System.out.println("EXCEPTION: NoSuchAlgorithmException");
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}
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catch (InvalidKeyException e)
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{
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System.out.println("EXCEPTION: InvalidKeyException");
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}
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}
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/**
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* Takes a single String as an argument and returns an Encrypted version
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* of that String.
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*
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* @param str
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* String to be encrypted
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* @return <code>String</code> Encrypted version of the provided String
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*/
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public String encrypt(String str)
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{
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try
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{
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// Encode the string into bytes using utf-8
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byte[] utf8 = str.getBytes("UTF8");
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// Encrypt
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byte[] enc = ecipher.doFinal(utf8);
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// Encode bytes to base64 to get a string
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return Base64.encodeBytes(enc);
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}
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catch (BadPaddingException e)
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{
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}
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catch (IllegalBlockSizeException e)
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{
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}
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catch (UnsupportedEncodingException e)
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{
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}
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catch (IOException e)
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{
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}
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return null;
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}
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/**
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* Takes a encrypted String as an argument, decrypts and returns the
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* decrypted String.
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*
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* @param str
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* Encrypted String to be decrypted
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* @return <code>String</code> Decrypted version of the provided String
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*/
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public String decrypt(String str)
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{
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try
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{
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// Decode base64 to get bytes
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byte[] dec = Base64.decode(str);
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// Decrypt
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byte[] utf8 = dcipher.doFinal(dec);
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// Decode using utf-8
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return new String(utf8, "UTF8");
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}
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catch (BadPaddingException e)
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{
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}
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catch (IllegalBlockSizeException e)
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{
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}
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catch (UnsupportedEncodingException e)
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{
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}
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catch (IOException e)
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{
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}
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return null;
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}
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//
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// /**
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// * The following method is used for testing the String Encrypter class.
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// * This method is responsible for encrypting and decrypting a sample
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// * String using several symmetric temporary Secret Keys.
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// */
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// public static void testUsingSecretKey()
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// {
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// try
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// {
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//
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// System.out.println();
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// System.out.println("+----------------------------------------+");
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// System.out.println("| -- Test Using Secret Key Method -- |");
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// System.out.println("+----------------------------------------+");
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// System.out.println();
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//
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// String secretString = "Attack at dawn!";
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//
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// // Generate a temporary key for this example. In practice, you would
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// // save this key somewhere. Keep in mind that you can also use a
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// // Pass Phrase.
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// SecretKey desKey = KeyGenerator.getInstance("DES").generateKey();
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// SecretKey blowfishKey = KeyGenerator.getInstance("Blowfish").generateKey();
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// SecretKey desedeKey = KeyGenerator.getInstance("DESede").generateKey();
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//
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// // Create encrypter/decrypter class
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// aagtlStringEncrypter desEncrypter = new aagtlStringEncrypter(desKey, desKey.getAlgorithm());
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// aagtlStringEncrypter blowfishEncrypter = new aagtlStringEncrypter(blowfishKey, blowfishKey
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// .getAlgorithm());
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// aagtlStringEncrypter desedeEncrypter = new aagtlStringEncrypter(desedeKey, desedeKey
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// .getAlgorithm());
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//
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// // Encrypt the string
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// String desEncrypted = desEncrypter.encrypt(secretString);
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// String blowfishEncrypted = blowfishEncrypter.encrypt(secretString);
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// String desedeEncrypted = desedeEncrypter.encrypt(secretString);
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//
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// // Decrypt the string
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// String desDecrypted = desEncrypter.decrypt(desEncrypted);
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// String blowfishDecrypted = blowfishEncrypter.decrypt(blowfishEncrypted);
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// String desedeDecrypted = desedeEncrypter.decrypt(desedeEncrypted);
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//
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// // Print out values
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// System.out.println(desKey.getAlgorithm() + " Encryption algorithm");
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// System.out.println(" Original String : " + secretString);
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// System.out.println(" Encrypted String : " + desEncrypted);
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// System.out.println(" Decrypted String : " + desDecrypted);
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// System.out.println();
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//
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// System.out.println(blowfishKey.getAlgorithm() + " Encryption algorithm");
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// System.out.println(" Original String : " + secretString);
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// System.out.println(" Encrypted String : " + blowfishEncrypted);
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// System.out.println(" Decrypted String : " + blowfishDecrypted);
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// System.out.println();
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//
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// System.out.println(desedeKey.getAlgorithm() + " Encryption algorithm");
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// System.out.println(" Original String : " + secretString);
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// System.out.println(" Encrypted String : " + desedeEncrypted);
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// System.out.println(" Decrypted String : " + desedeDecrypted);
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// System.out.println();
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//
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// }
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// catch (NoSuchAlgorithmException e)
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// {
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// }
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// }
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// /**
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// * The following method is used for testing the String Encrypter class.
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// * This method is responsible for encrypting and decrypting a sample
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// * String using using a Pass Phrase.
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// */
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// public static void testUsingPassPhrase()
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// {
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//
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// System.out.println();
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// System.out.println("+----------------------------------------+");
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// System.out.println("| -- Test Using Pass Phrase Method -- |");
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// System.out.println("+----------------------------------------+");
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// System.out.println();
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//
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// String secretString = "Attack at dawn!";
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// String passPhrase = "My Pass Phrase";
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//
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// // Create encrypter/decrypter class
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// aagtlStringEncrypter desEncrypter = new aagtlStringEncrypter(passPhrase);
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//
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// // Encrypt the string
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// String desEncrypted = desEncrypter.encrypt(secretString);
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//
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// // Decrypt the string
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// String desDecrypted = desEncrypter.decrypt(desEncrypted);
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//
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// // Print out values
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// System.out.println("PBEWithMD5AndDES Encryption algorithm");
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// System.out.println(" Original String : " + secretString);
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// System.out.println(" Encrypted String : " + desEncrypted);
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// System.out.println(" Decrypted String : " + desDecrypted);
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// System.out.println();
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//
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// }
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// public static void main(String[] args)
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// {
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// testUsingSecretKey();
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// testUsingPassPhrase();
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// }
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}
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