/* 
 * A JavaScript implementation of the RSA Data Security, Inc. MD5 Message 
 * Digest Algorithm, as defined in RFC 1321. 
 * Version 1.1 Copyright (C) Paul Johnston 1999 - 2002. 
 * Code also contributed by Greg Holt 
 * See http://pajhome.org.uk/site/legal.html for details. 
 */  
  
/* 
 * Add integers, wrapping at 2^32. This uses 16-bit operations internally 
 * to work around bugs in some JS interpreters. 
 */  
function safe_add(x, y)  
{  
  var lsw = (x & 0xFFFF) + (y & 0xFFFF)  
  var msw = (x >> 16) + (y >> 16) + (lsw >> 16)  
  return (msw << 16) | (lsw & 0xFFFF)  
}  
  
/* 
 * Bitwise rotate a 32-bit number to the left. 
 */  
function rol(num, cnt)  
{  
  return (num << cnt) | (num >>> (32 - cnt))  
}  
  
/* 
 * These functions implement the four basic operations the algorithm uses. 
 */  
function cmn(q, a, b, x, s, t)  
{  
  return safe_add(rol(safe_add(safe_add(a, q), safe_add(x, t)), s), b)  
}  
function ff(a, b, c, d, x, s, t)  
{  
  return cmn((b & c) | ((~b) & d), a, b, x, s, t)  
}  
function gg(a, b, c, d, x, s, t)  
{  
  return cmn((b & d) | (c & (~d)), a, b, x, s, t)  
}  
function