背景:使用微信小程序调用https接口,md5加密当前时间戳,然后再md5(时间戳的md5+约定好的key)生成token,来实现简单校验。服务端接口,判断时间戳是否在有效时间内,然后生成token对比传过来的token。

微信小程序使用的开发语言是js,网上找到js实现md5加密的代码,融合进小程序内使用

在utils目录下新建md5.js文件

function safeAdd (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 bitRotateLeft (num, cnt) {
  return (num << cnt) | (num >>> (32 - cnt))
}

/*
* These functions implement the four basic operations the algorithm uses.
*/
function md5cmn (q, a, b, x, s, t) {
  return safeAdd(bitRotateLeft(safeAdd(safeAdd(a, q), safeAdd(x, t)), s), b)
}
function md5ff (a, b, c, d, x, s, t) {
  return md5cmn((b & c) | ((~b) & d), a, b, x, s, t)
}
function md5gg (a, b, c, d, x, s, t) {
  return md5cmn((b & d) | (c & (~d)), a, b, x, s, t)
}
function md5hh (a, b, c, d, x, s, t) {
  return md5cmn(b ^ c ^ d, a, b, x, s, t)
}
function md5ii (a, b, c, d, x, s, t) {
  return md5cmn(c ^ (b | (~d)), a, b, x, s, t)
}

/*
* Calculate the MD5 of an array of little-endian words, and a bit length.
*/
function binlMD5 (x, len) {
  /* append padding */
  x[len >> 5] |= 0x80 << (len % 32)
  x[(((len + 64) >>> 9) << 4) + 14] = len

  var i
  var olda
  var oldb
  var oldc
  var oldd
  var a = 1732584193
  var b = -271733879
  var c = -1732584194
  var d = 271733878

  for (i = 0; i < x.length; i += 16) {
    olda = a
    oldb = b
    oldc = c
    oldd = d

    a = md5ff(a, b, c, d, x[i], 7, -680876936)
    d = md5ff(d, a, b, c, x[i + 1], 12, -389564586)
    c = md5ff(c, d, a, b, x[i + 2], 17, 606105819)
    b = md5ff(b, c, d, a, x[i + 3], 22, -1044525330)
    a = md5ff(a, b, c, d, x[i + 4], 7, -176418897)
    d = md5ff(d, a, b, c, x[i + 5], 12, 1200080426)
    c = md5ff(c, d, a, b, x[i + 6], 17, -1473231341)
    b = md5ff(b, c, d, a, x[i + 7], 22, -45705983)
    a = md5ff(a, b, c, d, x[i + 8], 7, 1770035416)
    d = md5ff(d, a, b, c, x[i + 9], 12, -1958414417)
    c = md5ff(c, d, a, b, x[i + 10], 17, -42063)
    b = md5ff(b, c, d, a, x[i + 11], 22, -1990404162)
    a = md5ff(a, b, c, d, x[i + 12], 7, 1804603682)
    d = md5ff(d, a, b, c, x[i + 13], 12, -40341101)
    c = md5ff(c, d, a, b, x[i + 14], 17, -1502002290)
    b = md5ff(b, c, d, a, x[i + 15], 22, 1236535329)

    a = md5gg(a, b, c, d, x[i + 1], 5, -165796510)
    d = md5gg(d, a, b, c, x[i + 6], 9, -1069501632)
    c = md5gg(c, d, a, b, x[i + 11], 14, 643717713)
    b = md5gg(b, c, d, a, x[i], 20, -373897302)
    a = md5gg(a, b, c, d, x[i + 5], 5, -701558691)
    d = md5gg(d, a, b, c, x[i + 10], 9, 38016083)
    c = md5gg(c, d, a, b, x[i + 15], 14, -660478335)
    b = md5gg(b, c, d, a, x[i + 4], 20, -405537848)
    a = md5gg(a, b, c, d, x[i + 9], 5, 568446438)
    d = md5gg(d, a, b, c, x[i + 14], 9, -1019803690)
    c = md5gg(c, d, a, b, x[i + 3], 14, -187363961)
    b = md5gg(b, c, d, a, x[i + 8], 20, 1163531501)
    a = md5gg(a, b, c, d, x[i + 13], 5, -1444681467)
    d = md5gg(d, a, b, c, x[i + 2], 9, -51403784)
    c = md5gg(c, d, a, b, x[i + 7], 14, 1735328473)
    b = md5gg(b, c, d, a, x[i + 12], 20, -1926607734)

    a = md5hh(a, b, c, d, x[i + 5], 4, -378558)
    d = md5hh(d, a, b, c, x[i + 8], 11, -2022574463)
    c = md5hh(c, d, a, b, x[i + 11], 16, 1839030562)
    b = md5hh(b, c, d, a, x[i + 14], 23, -35309556)
    a = md5hh(a, b, c, d, x[i + 1], 4, -1530992060)
    d = md5hh(d, a, b, c, x[i + 4], 11, 1272893353)
    c = md5hh(c, d, a, b, x[i + 7], 16, -155497632)
    b = md5hh(b, c, d, a, x[i + 10], 23, -1094730640)
    a = md5hh(a, b, c, d, x[i + 13], 4, 681279174)
    d = md5hh(d, a, b, c, x[i], 11, -358537222)
    c = md5hh(c, d, a, b, x[i + 3], 16, -722521979)
    b = md5hh(b, c, d, a, x[i + 6], 23, 76029189)
    a = md5hh(a, b, c, d, x[i + 9], 4, -640364487)
    d = md5hh(d, a, b, c, x[i + 12], 11, -421815835)
    c = md5hh(c, d, a, b, x[i + 15], 16, 530742520)
    b = md5hh(b, c, d, a, x[i + 2], 23, -995338651)

    a = md5ii(a, b, c, d, x[i], 6, -198630844)
    d = md5ii(d, a, b, c, x[i + 7], 10, 1126891415)
    c = md5ii(c, d, a, b, x[i + 14], 15, -1416354905)
    b = md5ii(b, c, d, a, x[i + 5], 21, -57434055)
    a = md5ii(a, b, c, d, x[i + 12], 6, 1700485571)
    d = md5ii(d, a, b, c, x[i + 3], 10, -1894986606)
    c = md5ii(c, d, a, b, x[i + 10], 15, -1051523)
    b = md5ii(b, c, d, a, x[i + 1], 21, -2054922799)
    a = md5ii(a, b, c, d, x[i + 8], 6, 1873313359)
    d = md5ii(d, a, b, c, x[i + 15], 10, -30611744)
    c = md5ii(c, d, a, b, x[i + 6], 15, -1560198380)
    b = md5ii(b, c, d, a, x[i + 13], 21, 1309151649)
    a = md5ii(a, b, c, d, x[i + 4], 6, -145523070)
    d = md5ii(d, a, b, c, x[i + 11], 10, -1120210379)
    c = md5ii(c, d, a, b, x[i + 2], 15, 718787259)
    b = md5ii(b, c, d, a, x[i + 9], 21, -343485551)

    a = safeAdd(a, olda)
    b = safeAdd(b, oldb)
    c = safeAdd(c, oldc)
    d = safeAdd(d, oldd)
  }
  return [a, b, c, d]
}

/*
* Convert an array of little-endian words to a string
*/
function binl2rstr (input) {
  var i
  var output = ''
  var length32 = input.length * 32
  for (i = 0; i < length32; i += 8) {
    output += String.fromCharCode((input[i >> 5] >>> (i % 32)) & 0xFF)
  }
  return output
}

/*
* Convert a raw string to an array of little-endian words
* Characters >255 have their high-byte silently ignored.
*/
function rstr2binl (input) {
  var i
  var output = []
  output[(input.length >> 2) - 1] = undefined
  for (i = 0; i < output.length; i += 1) {
    output[i] = 0
  }
  var length8 = input.length * 8
  for (i = 0; i < length8; i += 8) {
    output[i >> 5] |= (input.charCodeAt(i / 8) & 0xFF) << (i % 32)
  }
  return output
}

/*
* Calculate the MD5 of a raw string
*/
function rstrMD5 (s) {
  return binl2rstr(binlMD5(rstr2binl(s), s.length * 8))
}

/*
* Calculate the HMAC-MD5, of a key and some data (raw strings)
*/
function rstrHMACMD5 (key, data) {
  var i
  var bkey = rstr2binl(key)
  var ipad = []
  var opad = []
  var hash
  ipad[15] = opad[15] = undefined
  if (bkey.length > 16) {
    bkey = binlMD5(bkey, key.length * 8)
  }
  for (i = 0; i < 16; i += 1) {
    ipad[i] = bkey[i] ^ 0x36363636
    opad[i] = bkey[i] ^ 0x5C5C5C5C
  }
  hash = binlMD5(ipad.concat(rstr2binl(data)), 512 + data.length * 8)
  return binl2rstr(binlMD5(opad.concat(hash), 512 + 128))
}

/*
* Convert a raw string to a hex string
*/
function rstr2hex (input) {
  var hexTab = '0123456789abcdef'
  var output = ''
  var x
  var i
  for (i = 0; i < input.length; i += 1) {
    x = input.charCodeAt(i)
    output += hexTab.charAt((x >>> 4) & 0x0F) +
    hexTab.charAt(x & 0x0F)
  }
  return output
}

/*
* Encode a string as utf-8
*/
function str2rstrUTF8 (input) {
  return unescape(encodeURIComponent(input))
}

/*
* Take string arguments and return either raw or hex encoded strings
*/
function rawMD5 (s) {
  return rstrMD5(str2rstrUTF8(s))
}
function hexMD5 (s) {
  return rstr2hex(rawMD5(s))
}
function rawHMACMD5 (k, d) {
  return rstrHMACMD5(str2rstrUTF8(k), str2rstrUTF8(d))
}
function hexHMACMD5 (k, d) {
  return rstr2hex(rawHMACMD5(k, d))
}

function md5 (string, key, raw) {
  if (!key) {
    if (!raw) {
      return hexMD5(string)
    }
    return rawMD5(string)
  }
  if (!raw) {
    return hexHMACMD5(key, string)
  }
  return rawHMACMD5(key, string)
}

module.exports.md5 = md5

根据微信小程序文档

模块化 我们可以将一些公共的代码抽离成为一个单独的 js 文件,作为一个模块。模块只有通过 module.exports 或者
exports 才能对外暴露接口。

最后通过 module.exports.md5 = md5 将方法暴露出来,然后通过以下方式调用md5方法

var utilMd5 = require("../../utils/md5.js");
var d=new Date();
var callTime = parseInt(d.getTime()/1000);
console.log(utilMd5.md5(callTime));

完整的调用api接口示例如下:
如pages/index/index.js

var utilMd5 = require("../../utils/md5.js")

var app = getApp()
Page({
  data: {
    matchList: {},
    userInfo: {}
  },
  onLoad: function () {
    var d=new Date()
    var callTime = parseInt(d.getTime()/1000)
    var token = utilMd5.md5(utilMd5.md5(callTime)+"key")
    wx.request({
      url: 'https://api.xxxxx.com/xxxxxx',
      data: {},
      header: {
          'content-type': 'application/x-www-form-urlencoded',
          'callTime':callTime,
          'token':token
      },
      success: function(res) {
        console.log(res.data)
      },
      complete: function(res) {
        console.log(res.message)
      }
    })
  }
})