package com.gxtuan.util;

import java.security.NoSuchAlgorithmException;

import javax.crypto.Cipher;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

public class JiaMi {

 private String iv = "feie91o96t2q2p0p";
 private IvParameterSpec ivspec;
 private SecretKeySpec keyspec;
 private Cipher cipher;
 
 private String SecretKey = "8d0bfe2fb0311fd7";
 
 public JiaMi()
 {
  ivspec = new IvParameterSpec(iv.getBytes());

  keyspec = new SecretKeySpec(SecretKey.getBytes(), "AES");
  
  try {
   cipher = Cipher.getInstance("AES/CBC/NoPadding");
  } catch (NoSuchAlgorithmException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (NoSuchPaddingException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
 }
 
 public byte[] encrypt(String text) throws Exception
 {
  if(text == null || text.length() == 0)
   throw new Exception("Empty string");
  
  byte[] encrypted = null;

  try {
   cipher.init(Cipher.ENCRYPT_MODE, keyspec, ivspec);

   encrypted = cipher.doFinal(padString(text).getBytes());
  } catch (Exception e)
  {   
   throw new Exception("[encrypt] " + e.getMessage());
  }
  
  return encrypted;
 }
 
 public byte[] decrypt(String code) throws Exception
 {
  if(code == null || code.length() == 0)
   throw new Exception("Empty string");
  
  byte[] decrypted = null;

  try {
   cipher.init(Cipher.DECRYPT_MODE, keyspec, ivspec);
   
   decrypted = cipher.doFinal(hexToBytes(code));
  } catch (Exception e)
  {
   throw new Exception("[decrypt] " + e.getMessage());
  }
  return decrypted;
 }
 

 
 public static String bytesToHex(byte[] data)
 {
  if (data==null)
  {
   return null;
  }
  
  int len = data.length;
  String str = "";
  for (int i=0; i    if ((data[i]&0xFF)<16)
    str = str + "0" + java.lang.Integer.toHexString(data[i]&0xFF);
   else
    str = str + java.lang.Integer.toHexString(data[i]&0xFF);
  }
  return str;
 }
 
  
 public static byte[] hexToBytes(String str) {
  if (str==null) {
   return null;
  } else if (str.length() < 2) {
   return null;
  } else {
   int len = str.length() / 2;
   byte[] buffer = new byte[len];
   for (int i=0; i     buffer[i] = (byte) Integer.parseInt(str.substring(i*2,i*2+2),16);
   }
   return buffer;
  }
 }
 
 

 private static String padString(String source)
 {
   char paddingChar = ' ';
   int size = 16;
   int x = source.length() % size;
   int padLength = size - x;

   for (int i = 0; i < padLength; i++)
   {
    source += paddingChar;
   }

   return source;
 }
}
//使用方法：
//加密
String   encrypted = JiaMi.bytesToHex(jm.encrypt("你要加密的内容"));
//解密

String decrypted = new String(JiaMi.decrypt(encrypted));