微信小程序使用 sha1 进行密码加密方法详解

function encodeUTF8(s) {

 var i, r = [], c, x;

 for (i = 0; i < s.length; i++)

  if ((c = s.charCodeAt(i)) < 0x80) r.push(c);

  else if (c < 0x800) r.push(0xC0 + (c >> 6 & 0x1F), 0x80 + (c & 0x3F));

  else {

   if ((x = c ^ 0xD800) >> 10 == 0) //对四字节UTF-16转换为Unicode

    c = (x << 10) + (s.charCodeAt(++i) ^ 0xDC00) + 0x10000,

     r.push(0xF0 + (c >> 18 & 0x7), 0x80 + (c >> 12 & 0x3F));

   else r.push(0xE0 + (c >> 12 & 0xF));

   r.push(0x80 + (c >> 6 & 0x3F), 0x80 + (c & 0x3F));

  };

 return r;

};

// 字符串加密成 hex 字符串

function sha1(s) {

 var data = new Uint8Array(encodeUTF8(s))

 var i, j, t;

 var l = ((data.length + 8) >>> 6 << 4) + 16, s = new Uint8Array(l << 2);

 s.set(new Uint8Array(data.buffer)), s = new Uint32Array(s.buffer);

 for (t = new DataView(s.buffer), i = 0; i < l; i++)s[i] = t.getUint32(i << 2);

 s[data.length >> 2] |= 0x80 << (24 - (data.length & 3) * 8);

 s[l - 1] = data.length << 3;

 var w = [], f = [

  function () { return m[1] & m[2] | ~m[1] & m[3]; },

  function () { return m[1] ^ m[2] ^ m[3]; },

  function () { return m[1] & m[2] | m[1] & m[3] | m[2] & m[3]; },

  function () { return m[1] ^ m[2] ^ m[3]; }

 ], rol = function (n, c) { return n << c | n >>> (32 - c); },

  k = [1518500249, 1859775393, -1894007588, -899497514],

  m = [1732584193, -271733879, null, null, -1009589776];

 m[2] = ~m[0], m[3] = ~m[1];

 for (i = 0; i < s.length; i += 16) {

  var o = m.slice(0);

  for (j = 0; j < 80; j++)

   w[j] = j < 16 ? s[i + j] : rol(w[j - 3] ^ w[j - 8] ^ w[j - 14] ^ w[j - 16], 1),

    t = rol(m[0], 5) + f[j / 20 | 0]() + m[4] + w[j] + k[j / 20 | 0] | 0,

    m[1] = rol(m[1], 30), m.pop(), m.unshift(t);

  for (j = 0; j < 5; j++)m[j] = m[j] + o[j] | 0;

 };

 t = new DataView(new Uint32Array(m).buffer);

 for (var i = 0; i < 5; i++)m[i] = t.getUint32(i << 2);

 var hex = Array.prototype.map.call(new Uint8Array(new Uint32Array(m).buffer), function (e) {

  return (e < 16 ? "0" : "") + e.toString(16);

 }).join("");

 return hex;

};

module.exports = {

 formatTime: formatTime,

 sha1:sha1

}

var util = require('../../utils/util.js')

util.sha1("123456")