content: package com.rsen.util;
  
  import java.security.MessageDigest;
  
  /**
   * Created by angcyo on 15-09-27-027.
   */
  public class MD5 {
  
      /***
       * MD5加码 生成32位md5码
       */
      public static String toMD5(String source) {
          MessageDigest mDigest;
          StringBuffer hexString = new StringBuffer();
          try {
              mDigest = MessageDigest.getInstance("MD5");
              mDigest.update(source.getBytes("UTF-8"));
              byte[] md5bytes = mDigest.digest();
              for (byte b : md5bytes) {
                  if ((b & 0xFF) < 0x10)
                      hexString.append("0");
                  hexString.append(Integer.toHexString(b & 0xFF));
              }
          } catch (Exception e) {
              e.printStackTrace();
          }
          return hexString.toString();
      }
  
      /***
       * MD5加码 生成48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 = ((int) md5Bytes[i]) & 0xff;
              if (val < 16)
                  hexValue.append("0");
              hexValue.append(Integer.toHexString(val) + 1);
          }
          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;
      }
  }
  