进行HTTP网络通信的时候，调用API向服务器请求数据，有时为了防止API调用过程中被黑客恶意篡改，所请求参数需要进行MD5算法计算，得到摘要签名。服务端会根据请求参数，对签名进行验证，签名不合法的请求将会被拒绝。
但是目前原生JS貌似并没有提供MD5计算相关的函数方法，只能自己实现或者使用前辈大神写好的。网上找了下，找到了这个MD5的javaScript实现。
直接上类库代码
/* * JavaScript MD5 * https://github.com/blueimp/JavaScript-MD5 * * Copyright 2011, Sebastian Tschan * https://blueimp.net * * Licensed under the MIT license: * https://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. *//* global define */;(function($){ 'use strict' /* * Add integers, wrapping at 2^32. This uses 16-bit operations internally * to work around bugs in some JS interpreters. */ 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) } if (typeof define === 'function' && define.amd) { define(function() { return md5 }) } else if (typeof module === 'object' && module.exports) { module.exports = md5 } else { $.md5 = md5 }})(this)
在应用代码中，通过调用以字符串作为参数的MD5方法来计算字符串的MD5值，结果返回32位小写的十六进制值的字符串。
var v1= md5('{"name":"嘻嘻嘻嘻嘻嘻嘻嘻嘻","age":22}'); //56b21847ed32d2d96cf74077b22342eb console.log(v1); var v2= md5('{"name":"嘻嘻嘻嘻嘻嘻嘻嘻嘻"}');//80b36b8a15ece3158c4e30130d4d4453 console.log(v2);
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