return;
        }
      
        /*
          b2iu是我写的一个把byte按照不考虑正负号的原则的＂升位＂程序，因为java没有unsigned运算
        */
        public static long b2iu(byte b) {
                return b < 0 ? b & 0x7F + 128 : b;
        }
       
/*byteHEX()，用来把一个byte类型的数转换成十六进制的ASCII表示，
　因为java中的byte的toString无法实现这一点，我们又没有C语言中的
 sprintf(outbuf,"%02X",ib)
*/
        public static String byteHEX(byte ib) {
                char[] Digit = { '0','1','2','3','4','5','6','7','8','9',
                'A','B','C','D','E','F' };
                char [] ob = new char[2];
                ob[0] = Digit[(ib >>> 4) & 0X0F];
                ob[1] = Digit[ib & 0X0F];
                String s = new String(ob);
                return s;
        }

        public static void main(String args[]) {

                MD5 m = new MD5();
                if (Array.getLength(args) == 0) {   //如果没有参数，执行标准的Test Suite
               
                        System.out.println("MD5 Test suite:");
                System.out.println("MD5(\"\"):"+m.getMD5ofStr(""));
                System.out.println("MD5(\"a\"):"+m.getMD5ofStr("a"));
                System.out.println("MD5(\"abc\"):"+m.getMD5ofStr("abc"));
                System.out.println("MD5(\"message digest\"):"+m.getMD5ofStr("message digest"));
                System.out.println("MD5(\"abcdefghijklmnopqrstuvwxyz\"):"+
                        m.getMD5ofStr("abcdefghijklmnopqrstuvwxyz"));
                System.out.println("MD5(\"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789\"):"+
                      m.getMD5ofStr("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"));
                }
                else
                      System.out.println("MD5(" + args[0] + ")=" + m.getMD5ofStr(args[0]));
               
        
        }