微信小程序如何进行md5加密？

在util下新建md5.js文件，内容如下：

/* 
 * 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 hh(a, b, c, d, x, s, t)  
{  
 return cmn(b ^ c ^ d, a, b, x, s, t)  
}  
function ii(a, b, c, d, x, s, t)  
{  
 return cmn(c ^ (b | (~d)), a, b, x, s, t)  
}  
  
/* 
 * Calculate the MD5 of an array of little-endian words, producing an array 
 * of little-endian words. 
 */  
function coreMD5(x)  
{  
 var a = 1732584193  
 var b = -271733879  
 var c = -1732584194  
 var d = 271733878  
  
 for(var i = 0; i < x.length; i += 16)  
 {  
  var olda = a  
  var oldb = b  
  var oldc = c  
  var oldd = d  
  
  a = ff(a, b, c, d, x[i+ 0], 7 , -680876936)  
  d = ff(d, a, b, c, x[i+ 1], 12, -389564586)  
  c = ff(c, d, a, b, x[i+ 2], 17, 606105819)  
  b = ff(b, c, d, a, x[i+ 3], 22, -1044525330)  
  a = ff(a, b, c, d, x[i+ 4], 7 , -176418897)  
  d = ff(d, a, b, c, x[i+ 5], 12, 1200080426)  
  c = ff(c, d, a, b, x[i+ 6], 17, -1473231341)  
  b = ff(b, c, d, a, x[i+ 7], 22, -45705983)  
  a = ff(a, b, c, d, x[i+ 8], 7 , 1770035416)  
  d = ff(d, a, b, c, x[i+ 9], 12, -1958414417)  
  c = ff(c, d, a, b, x[i+10], 17, -42063)  
  b = ff(b, c, d, a, x[i+11], 22, -1990404162)  
  a = ff(a, b, c, d, x[i+12], 7 , 1804603682)  
  d = ff(d, a, b, c, x[i+13], 12, -40341101)  
  c = ff(c, d, a, b, x[i+14], 17, -1502002290)  
  b = ff(b, c, d, a, x[i+15], 22, 1236535329)  
  
  a = gg(a, b, c, d, x[i+ 1], 5 , -165796510)  
  d = gg(d, a, b, c, x[i+ 6], 9 , -1069501632)  
  c = gg(c, d, a, b, x[i+11], 14, 6437...

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