javascript 生成MD5加密

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https://www.bootcdn.cn/blueimp-md5/。

<script src="https://cdn.bootcss.com/blueimp-md5/2.10.0/js/md5.js"></script>

<script src="https://cdn.bootcss.com/blueimp-md5/2.10.0/js/md5.min.js"></script>

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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