//-------------------------------------------------------------------------- 
// $Id$ 
//-------------------------------------------------------------------------- 
// Copyright (c) 1995-2005 Zhang Erning <zendragon@dragonsoft.net> 
// 
// The use and distribution terms for this software are covered by the 
// Common Public License 1.0 (http://opensource.org/licenses/cpl.php) 
// which can be found in the file CPL.TXT at the root of this distribution. 
// By using this software in any fashion, you are agreeing to be bound by 
// the terms of this license. 
// 
// You must not remove this notice, or any other, from this software. 
//-------------------------------------------------------------------------- 
 
package sample.server; 
 
import org.apache.commons.codec.binary.Base64; 
import org.apache.commons.lang.StringUtils; 
 
import javax.crypto.KeyGenerator; 
import javax.crypto.SecretKey; 
import javax.crypto.Cipher; 
import javax.crypto.spec.SecretKeySpec; 
 
import sample.SampleService; 
 
public class SampleServiceImpl implements SampleService 
{ 
    public static final char SPLITER = '|'; 
    public static final String ALGORITHM = "DES";
 
 
    public String encrypt(String b64Data) throws Exception 
    { 
        SecretKey secretKey = KeyGenerator.getInstance(ALGORITHM).generateKey(); 
        Cipher cipher = Cipher.getInstance(ALGORITHM); 
        cipher.init(Cipher.ENCRYPT_MODE, secretKey); 
        byte[] data = Base64.decodeBase64(b64Data.getBytes()); 
        byte[] encryptedData = cipher.doFinal(data); 
        String b64EncryptedData = new String(Base64.encodeBase64(encryptedData)); 
        String b64SecretKey = new String(Base64.encodeBase64(secretKey.getEncoded())); 
        String encrypted = b64EncryptedData + SPLITER + b64SecretKey; 
        return encrypted; 
    }
 
 
    public String decrypt(String encrypted) throws Exception 
    { 
        String[] strs = StringUtils.split(encrypted, SPLITER); 
        String b64EncryptedData = strs[0]; 
        String b64SecretKey = strs[1]; 
 
        SecretKey secretKey = new SecretKeySpec(Base64.decodeBase64(b64SecretKey.getBytes()), ALGORITHM); 
        Cipher cipher = Cipher.getInstance(ALGORITHM); 
        cipher.init(Cipher.DECRYPT_MODE, secretKey); 
        byte[] encryptedData = Base64.decodeBase64(b64EncryptedData.getBytes()); 
        byte[] data = cipher.doFinal(encryptedData); 
        String b64Data = new String(Base64.encodeBase64(data)); 
        return b64Data; 
    } 
 
}