微信小程序：MD5 加密

微信小程序是基于 js 进行封装的，所以，本质上是 js 的 MD5 加密

一个问题是，我后台服务器用的是 Python，js 和 Python 会有 MD5 密文不一致的情况

具体参考：https://segmentfault.com/q/1010000009285922

网上可以下载到很多第三方的 MD5 包，但是微信小程序和 js 还是不同的，需要稍微的进行改造

/** JavaScript MD5 1.0.1* https://github.com/blueimp/JavaScript-MD5** Copyright 2011, Sebastian Tschan* https://blueimp.net** Licensed under the MIT license:* http://www.opensource.org/licenses/MIT* * Based on* A JavaScript implementation of the RSA Data Security, Inc. MD5 Message* Digest Algorithm, as defined in RFC 1321.* Version 2.2 Copyright (C) Paul Johnston 1999 - 2009* Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet* Distributed under the BSD License* See http://pajhome.org.uk/crypt/md5 for more info.*//*jslint bitwise: true */
/*global unescape, define *//** 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),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));}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);}module.exports = {md5: md5
}

具体使用：

var key = require('../../utils/md5.js');
tokenKey = key.md5(_tokenKey);

参考文章：https://blog.csdn.net/qq_27626333/article/details/53634897

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