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package org.sonny.pjt.util;

import java.security.SecureRandom;
import java.security.Security;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;

public class DESService {
 
 private String  algorithm = "DES";
 private SecretKey secretKey = null;
 private Cipher cipher = null;
 private SecureRandom random = new SecureRandom();
  
 public DESService(String key) {
  init(key);
 }
 
 public byte[] deCrypt(String data) {
  try{
   cipher.init(Cipher.DECRYPT_MODE, secretKey, random);
   return cipher.doFinal(Base32.decode(data));
  }catch(Exception e) {
   e.printStackTrace();
   return null;
  }
 }
 
 public String encrypt(byte[] data) {
  try{
   cipher.init(Cipher.ENCRYPT_MODE, secretKey, random);
   byte[] cipherByte = cipher.doFinal(data);
   return Base32.encode(cipherByte);
  }catch(Exception e) {
   e.printStackTrace();
   return null;
  }
 }
 
 private void init(String key){
  try{
   Security.addProvider(new com.sun.crypto.provider.SunJCE());
   byte rawKeyData[] = key.getBytes();
   DESKeySpec dks = new DESKeySpec(rawKeyData);
   SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(algorithm);
   secretKey = keyFactory.generateSecret(dks);
   cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
  }catch(Exception e) {
   e.printStackTrace();
  }
 }
 
 private String base16Encode(byte[] data) {
  String s = "";
  for(int i = 0; i < data.length; i++) {
   String bs = Integer.toHexString(data[i]).toUpperCase();
   if(bs.length() > 2) {
    bs = bs.substring(bs.length() - 2);
   } else if(bs.length() < 2) {
    bs = "0" + bs;
   }
   s += bs;
  }
  return s;
 }
 
 private byte[] base16Decode(String data) {
  byte[] r = new byte[data.length() / 2];
  for(int i = 0; i < r.length; i++) {
   String s = data.substring(i * 2, i * 2 + 2);
   r[i] = Integer.valueOf(s, 16).byteValue();
  }
  return r;
 }
 
}

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