MD5 加密与解密

package com.csl.common.utils;
import java.security.MessageDigest;  
public class MD5Util {
  /*** 
   * MD5加码 生成32位md5码 
   */  
  public static String string2MD5(String inStr){  
      MessageDigest md5 = null;  
      try{  
          md5 = MessageDigest.getInstance("MD5");  
      }catch (Exception e){  
          System.out.println(e.toString());  
          e.printStackTrace();  
          return "";  
      }  
      char[] charArray = inStr.toCharArray();  
      byte[] byteArray = new byte[charArray.length];  

      for (int i = 0; i < charArray.length; i++)  
          byteArray[i] = (byte) charArray[i];  
      byte[] md5Bytes = md5.digest(byteArray);  
      StringBuffer hexValue = new StringBuffer();  
      for (int i = 0; i < md5Bytes.length; i++){  
          int val = (md5Bytes[i]) & 0xff;  
          if (val < 16)  
              hexValue.append("0");  
          hexValue.append(Integer.toHexString(val));  
      }  
      return hexValue.toString();  

  }  

  /** 
   * 加密解密算法 执行一次加密，两次解密 
   */   
  public static String convertMD5(String inStr){  

      char[] a = inStr.toCharArray();  
      for (int i = 0; i < a.length; i++){  
          a[i] = (char) (a[i] ^ 't');  
      }  
      String s = new String(a);  
      return s;  
  }  
  
  /**
   * MD5解密
   * @param inStr
   * @return
   */
  public static String decrypt(String inStr){  

    String str= convertMD5(convertMD5(inStr));
    return str;
  }  
  

  // 测试主函数  
  public static void main(String args[]) {  
      String s = new String("A20180101,B20180101,C20180101,D20180101,E20180101,F20180101,G20180101,F20180101;2-1");  
      System.out.println("原始：" + s);  
      System.out.println("MD5后：" + string2MD5(s));  
      System.out.println("加密的：" + convertMD5(s));  
      System.out.println("解密的：" + decrypt(s));
    
  } 
    
}