微信小程序md5加密算法封装及用法详解--微信小程序生成md5签名
- 解释：
微信小程序不让引入现成的库文件，于是自己封装一个md5加密算法的js - 用途：
各种加密场景，比如生成md5签名（本文以生成md5签名为例）
md5.js（目录: /utils/md5.js，通过export 输出md5加密方法）
/*
* 小程序MD5加密算法封装
* +-----------------------------------------------------
* Author: 武当山道士
* Created: 2018-01-06
* Md5 Lib Source: http://cdn.bootcss.com/blueimp-md5/1.1.0/js/md5.js
* Tips: js库文件改装,加密算法没动，我只是封装了一下，便于小程序调用
* Thanks: 感谢js库文件作者 Sebastian Tschan 的辛勤付出
* +-----------------------------------------------------
* Usage:
*
* 引入(比如index.js页面引入md5.js):
* //pages/index.js
* import md5 from 'utils/md5.js';
*
* 调用base64MD5加密:
* var encryptedStr = md5('需要加密的字符串');
*/
function safe_add(x, y) {
var lsw = (x & 0xFFFF) + (y & 0xFFFF),
msw = (x >> 16) + (y >> 16) + (lsw >> 16);
return (msw << 16) | (lsw & 0xFFFF);
}
/*
* Bitwise rotate a 32-bit number to the left.
*/
function bit_rol(num, cnt) {
return (num << cnt) | (num >>> (32 - cnt));
}
/*
* These functions implement the four basic operations the algorithm uses.
*/
function md5_cmn(q, a, b, x, s, t) {
return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s), b);
}
function md5_ff(a, b, c, d, x, s, t) {
return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t);
}
function md5_gg(a, b, c, d, x, s, t) {
return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t);
}
function md5_hh(a, b, c, d, x, s, t) {
return md5_cmn(b ^ c ^ d, a, b, x, s, t);
}
function md5_ii(a, b, c, d, x, s, t) {
return md5_cmn(c ^ (b | (~d)), a, b, x, s, t);
}
/*
* Calculate the MD5 of an array of little-endian words, and a bit length.
*/
function binl_md5(x, len) {
/* append padding */
x[len >> 5] |= 0x80 << (len % 32);
x[(((len + 64) >>> 9) << 4) + 14] = len;
var i, olda, oldb, oldc, oldd,
a = 1732584193,
b = -271733879,
c = -1732584194,
d = 271733878;
for (i = 0; i < x.length; i += 16) {
olda = a;
oldb = b;
oldc = c;
oldd = d;
a = md5_ff(a, b, c, d, x[i], 7, -680876936);
d = md5_ff(d, a, b, c, x[i + 1], 12, -389564586);
c = md5_ff(c, d, a, b, x[i + 2], 17, 606105819);
b = md5_ff(b, c, d, a, x[i + 3], 22, -1044525330);
a = md5_ff(a, b, c, d, x[i + 4], 7, -176418897);
d = md5_ff(d, a, b, c, x[i + 5], 12, 1200080426);
c = md5_ff(c, d, a, b, x[i + 6], 17, -1473231341);
b = md5_ff(b, c, d, a, x[i + 7], 22, -45705983);
a = md5_ff(a, b, c, d, x[i + 8], 7, 1770035416);
d = md5_ff(d, a, b, c, x[i + 9], 12, -1958414417);
c = md5_ff(c, d, a, b, x[i + 10], 17, -42063);
b = md5_ff(b, c, d, a, x[i + 11], 22, -1990404162);
a = md5_ff(a, b, c, d, x[i + 12], 7, 1804603682);
d = md5_ff(d, a, b, c, x[i + 13], 12, -40341101);
c = md5_ff(c, d, a, b, x[i + 14], 17, -1502002290);
b = md5_ff(b, c, d, a, x[i + 15], 22, 1236535329);
a = md5_gg(a, b, c, d, x[i + 1], 5, -165796510);
d = md5_gg(d, a, b, c, x[i + 6], 9, -1069501632);
c = md5_gg(c, d, a, b, x[i + 11], 14, 643717713);
b = md5_gg(b, c, d, a, x[i], 20, -373897302);
a = md5_gg(a, b, c, d, x[i + 5], 5, -701558691);
d = md5_gg(d, a, b, c, x[i + 10], 9, 38016083);
c = md5_gg(c, d, a, b, x[i + 15], 14, -660478335);
b = md5_gg(b, c, d, a, x[i + 4], 20, -405537848);
a = md5_gg(a, b, c, d, x[i + 9], 5, 568446438);
d = md5_gg(d, a, b, c, x[i + 14], 9, -1019803690);
c = md5_gg(c, d, a, b, x[i + 3], 14, -187363961);
b = md5_gg(b, c, d, a, x[i + 8], 20, 1163531501);
a = md5_gg(a, b, c, d, x[i + 13], 5, -1444681467);
d = md5_gg(d, a, b, c, x[i + 2], 9, -51403784);
c = md5_gg(c, d, a, b, x[i + 7], 14, 1735328473);
b = md5_gg(b, c, d, a, x[i + 12], 20, -1926607734);
a = md5_hh(a, b, c, d, x[i + 5], 4, -378558);
d = md5_hh(d, a, b, c, x[i + 8], 11, -2022574463);
c = md5_hh(c, d, a, b, x[i + 11], 16, 1839030562);
b = md5_hh(b, c, d, a, x[i + 14], 23, -35309556);
a = md5_hh(a, b, c, d, x[i + 1], 4, -1530992060);
d = md5_hh(d, a, b, c, x[i + 4], 11, 1272893353);
c = md5_hh(c, d, a, b, x[i + 7], 16, -155497632);
b = md5_hh(b, c, d, a, x[i + 10], 23, -1094730640);
a = md5_hh(a, b, c, d, x[i + 13], 4, 681279174);
d = md5_hh(d, a, b, c, x[i], 11, -358537222);
c = md5_hh(c, d, a, b, x[i + 3], 16, -722521979);
b = md5_hh(b, c, d, a, x[i + 6], 23, 76029189);
a = md5_hh(a, b, c, d, x[i + 9], 4, -640364487);
d = md5_hh(d, a, b, c, x[i + 12], 11, -421815835);
c = md5_hh(c, d, a, b, x[i + 15], 16, 530742520);
b = md5_hh(b, c, d, a, x[i + 2], 23, -995338651);
a = md5_ii(a, b, c, d, x[i], 6, -198630844);
d = md5_ii(d, a, b, c, x[i + 7], 10, 1126891415);
c = md5_ii(c, d, a, b, x[i + 14], 15, -1416354905);
b = md5_ii(b, c, d, a, x[i + 5], 21, -57434055);
a = md5_ii(a, b, c, d, x[i + 12], 6, 1700485571);
d = md5_ii(d, a, b, c, x[i + 3], 10, -1894986606);
c = md5_ii(c, d, a, b, x[i + 10], 15, -1051523);
b = md5_ii(b, c, d, a, x[i + 1], 21, -2054922799);
a = md5_ii(a, b, c, d, x[i + 8], 6, 1873313359);
d = md5_ii(d, a, b, c, x[i + 15], 10, -30611744);
c = md5_ii(c, d, a, b, x[i + 6], 15, -1560198380);
b = md5_ii(b, c, d, a, x[i + 13], 21, 1309151649);
a = md5_ii(a, b, c, d, x[i + 4], 6, -145523070);
d = md5_ii(d, a, b, c, x[i + 11], 10, -1120210379);
c = md5_ii(c, d, a, b, x[i + 2], 15, 718787259);
b = md5_ii(b, c, d, a, x[i + 9], 21, -343485551);
a = safe_add(a, olda);
b = safe_add(b, oldb);
c = safe_add(c, oldc);
d = safe_add(d, oldd);
}
return [a, b, c, d];
}
/*
* Convert an array of little-endian words to a string
*/
function binl2rstr(input) {
var i,
output = '';
for (i = 0; i < input.length * 32; 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,
output = [];
output[(input.length >> 2) - 1] = undefined;
for (i = 0; i < output.length; i += 1) {
output[i] = 0;
}
for (i = 0; i < input.length * 8; i += 8) {
output[i >> 5] |= (input.charCodeAt(i / 8) & 0xFF) << (i % 32);
}
return output;
}
/*
* Calculate the MD5 of a raw string
*/
function rstr_md5(s) {
return binl2rstr(binl_md5(rstr2binl(s), s.length * 8));
}
/*
* Calculate the HMAC-MD5, of a key and some data (raw strings)
*/
function rstr_hmac_md5(key, data) {
var i,
bkey = rstr2binl(key),
ipad = [],
opad = [],
hash;
ipad[15] = opad[15] = undefined;
if (bkey.length > 16) {
bkey = binl_md5(bkey, key.length * 8);
}
for (i = 0; i < 16; i += 1) {
ipad[i] = bkey[i] ^ 0x36363636;
opad[i] = bkey[i] ^ 0x5C5C5C5C;
}
hash = binl_md5(ipad.concat(rstr2binl(data)), 512 + data.length * 8);
return binl2rstr(binl_md5(opad.concat(hash), 512 + 128));
}
/*
* Convert a raw string to a hex string
*/
function rstr2hex(input) {
var hex_tab = '0123456789abcdef',
output = '',
x,
i;
for (i = 0; i < input.length; i += 1) {
x = input.charCodeAt(i);
output += hex_tab.charAt((x >>> 4) & 0x0F) +
hex_tab.charAt(x & 0x0F);
}
return output;
}
/*
* Encode a string as utf-8
*/
function str2rstr_utf8(input) {
return unescape(encodeURIComponent(input));
}
/*
* Take string arguments and return either raw or hex encoded strings
*/
function raw_md5(s) {
return rstr_md5(str2rstr_utf8(s));
}
function hex_md5(s) {
return rstr2hex(raw_md5(s));
}
function raw_hmac_md5(k, d) {
return rstr_hmac_md5(str2rstr_utf8(k), str2rstr_utf8(d));
}
function hex_hmac_md5(k, d) {
return rstr2hex(raw_hmac_md5(k, d));
}
/**
* 暴露接口给小程序 因为export default，所以引入的时候可以自定义方法名称
* +--------------------
* @param {String} string 需要加密的字符串
* @param {String} key 加密key
* @param {Boolean} raw 规则 false: 返回hex_md5, true: 返回raw_md5
*/
export default function md5(string, key, raw) {
if (!key) {
if (!raw) {
return hex_md5(string);
}
return raw_md5(string);
}
if (!raw) {
return hex_hmac_md5(key, string);
}
return raw_hmac_md5(key, string);
}app.js （通过import引入md5加密方法）:
//app.js
//方法名自定义 比如import makeMd5 from 'utils/md5.js';
import md5 from 'utils/md5.js';
App({
globalData: {
appSecret: 'adfjjlw',
//other data
},
onReady: function(){
},
onLaunch: function () {
},
/**
* 数组对象按key升序, 并生成 md5_hex 签名
* @param {Array/Object} obj 数组对象
* @return {String} encrypted md5加密后的字符串
*/
makeSign: function(obj){
if(!obj) {console.log('需要加密的数组对象为空')}
var str = '';
var secret = this.globalData.appSecret;
if (!secret) { console.log('密钥未获取'); }
//生成key升序数组
var arr = Object.keys(obj);
arr.sort();
for(var i in arr){
str += arr[i] + obj[arr[i]];
}
var encrypted = md5(str + secret);
return encrypted;
},
})其他页面调用签名算法 /pages/index.js：
//pages/index.js
const app = getApp()
Page({
data:{
userInfo:{name:'Terrance',age:33},
appkey: 'fff222',
//other data
},
onLoad: function(){
},
// 根据传参数组obj，追加appkey，生成签名，并返回加签后的数据，用于网络传输
makePostData: function(obj){
var postData = obj;
postData.key = this.data.appkey;
postData.sign = app.makeSign(obj);//调用app.js的加密方法
return postData;
},
//网络操作: 设置用户信息
setUserInfo: function(){
var userData = this.data.userInfo;
var postData = this.makePostData(userData);
wx.request(
wx.request({
url: 'https://接口网址',
data: postData,
method:'POST',
header: { 'content-type':'application/x-www-form-urlencoded'},
success: function (res) {
console.log(res.data);
}
)
}，
})