在javascript中实现最快的MD5

我听说Joseph的Myers实现非常快。此外,他还有一个 lengthy article 关于描述他在编写实现时所学知识的JavaScript优化。对于任何对性能javascript感兴趣的人来说,这是一个很好的读物。

http://www.webreference.com/programming/javascript/jkm3/

可以找到他的MD5实现 here

在这种情况下,我建议您使用CryptoJS。

基本上,CryptoJS是使用最佳实践和模式在JavaScript中实现的越来越多的标准和安全加密算法的集合。它们速度很快,并且有一个一致和简单的接口。

因此,如果要计算密码字符串的MD5哈希,请执行以下操作:

<script src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/3.1.9-1/md5.js"></script>
<script>
    var passhash = CryptoJS.MD5(password);

    $.post(
      'includes/login.php', 
      { user: username, pass: passhash },
      onLogin, 
      'json' );
</script>

所以这个脚本将把密码字符串的散列值发布到服务器上。

有关其他哈希计算算法的更多信息和支持,请访问:

http://code.google.com/p/crypto-js/

在选择库的同时,重要的是看看它是否支持诸如Bower这样的现代框架,通过jslint,支持jquery的插件模型或amd/requirejs这样的模块系统,除了在积极的开发中,还有1个以上的贡献者。有几个选项可以满足这些附加标准的一部分或全部:

• CryptoJS :这可能是最具扩展性的库,每个算法都可以单独使用,而不必在JS代码中添加FAT。加上它作为编码/解码器,用于UTF8、UTF16和Base64。我坚持 github repository 它注册为Bower Package,以及如何与RequireJS一起使用的说明。
• Spark MD5 :这是基于其他答案提到的JKM代码,这也是更快的实现。但是,另外,spark实现增加了对amd的支持,passes-jslint plus有增量模式。它没有base64 O/P,但有原始O/P(即32位int插入字符串的数组)。
• JQuery MD5 plugin :非常简单,但似乎没有原始模式。
• JavaScript-MD5 :没有火花那么花哨或快,但更简单。

CryptoJS示例:

//just include md5.js from the CryptoJS rollups folder
var hash = CryptoJS.MD5("Message");
console.log(hash.toString()); 

上面的库在 http://jsperf.com/md5-shootout/7 . 在我的机器上,当前的测试(这是公认的旧测试)表明,如果您正在寻找速度火花MD5是您的最佳选择(所以是纯JKM代码)。但是,如果您寻找更全面的库,那么CryptoJS是您的最佳选择,尽管它比Spark MD5慢79%。不过,我认为CryptoJS最终会达到和它更活跃的项目相同的速度。

我找到了许多关于这个主题的文章。 他们都建议约瑟夫·迈耶斯实施。

见: http://jsperf.com/md5-shootout 在一些测试中

在追求终极速度的过程中,我看了一下这段代码,我发现它可以改进。所以我基于Joseph Meyers代码创建了一个新的JS脚本。

看见 Improved Jospeh Meyers code

MD5 = function(e) {
    function h(a, b) {
        var c, d, e, f, g;
        e = a & 2147483648;
        f = b & 2147483648;
        c = a & 1073741824;
        d = b & 1073741824;
        g = (a & 1073741823) + (b & 1073741823);
        return c & d ? g ^ 2147483648 ^ e ^ f : c | d ? g & 1073741824 ? g ^ 3221225472 ^ e ^ f : g ^ 1073741824 ^ e ^ f : g ^ e ^ f
    }

    function k(a, b, c, d, e, f, g) {
        a = h(a, h(h(b & c | ~b & d, e), g));
        return h(a << f | a >>> 32 - f, b)
    }

    function l(a, b, c, d, e, f, g) {
        a = h(a, h(h(b & d | c & ~d, e), g));
        return h(a << f | a >>> 32 - f, b)
    }

    function m(a, b, d, c, e, f, g) {
        a = h(a, h(h(b ^ d ^ c, e), g));
        return h(a << f | a >>> 32 - f, b)
    }

    function n(a, b, d, c, e, f, g) {
        a = h(a, h(h(d ^ (b | ~c), e), g));
        return h(a << f | a >>> 32 - f, b)
    }

    function p(a) {
        var b = "",
            d = "",
            c;
        for (c = 0; 3 >= c; c++) d = a >>> 8 * c & 255, d = "0" + d.toString(16), b += d.substr(d.length - 2, 2);
        return b
    }
    var f = [],
        q, r, s, t, a, b, c, d;
    e = function(a) {
        a = a.replace(/\r\n/g, "\n");
        for (var b = "", d = 0; d < a.length; d++) {
            var c = a.charCodeAt(d);
            128 > c ? b += String.fromCharCode(c) : (127 < c && 2048 > c ? b += String.fromCharCode(c >> 6 | 192) : (b += String.fromCharCode(c >> 12 | 224), b += String.fromCharCode(c >> 6 & 63 | 128)), b += String.fromCharCode(c & 63 | 128))
        }
        return b
    }(e);
    f = function(b) {
        var a, c = b.length;
        a = c + 8;
        for (var d = 16 * ((a - a % 64) / 64 + 1), e = Array(d - 1), f = 0, g = 0; g < c;) a = (g - g % 4) / 4, f = g % 4 * 8, e[a] |= b.charCodeAt(g) << f, g++;
        a = (g - g % 4) / 4;
        e[a] |= 128 << g % 4 * 8;
        e[d - 2] = c << 3;
        e[d - 1] = c >>> 29;
        return e
    }(e);
    a = 1732584193;
    b = 4023233417;
    c = 2562383102;
    d = 271733878;
    for (e = 0; e < f.length; e += 16) q = a, r = b, s = c, t = d, a = k(a, b, c, d, f[e + 0], 7, 3614090360), d = k(d, a, b, c, f[e + 1], 12, 3905402710), c = k(c, d, a, b, f[e + 2], 17, 606105819), b = k(b, c, d, a, f[e + 3], 22, 3250441966), a = k(a, b, c, d, f[e + 4], 7, 4118548399), d = k(d, a, b, c, f[e + 5], 12, 1200080426), c = k(c, d, a, b, f[e + 6], 17, 2821735955), b = k(b, c, d, a, f[e + 7], 22, 4249261313), a = k(a, b, c, d, f[e + 8], 7, 1770035416), d = k(d, a, b, c, f[e + 9], 12, 2336552879), c = k(c, d, a, b, f[e + 10], 17, 4294925233), b = k(b, c, d, a, f[e + 11], 22, 2304563134), a = k(a, b, c, d, f[e + 12], 7, 1804603682), d = k(d, a, b, c, f[e + 13], 12, 4254626195), c = k(c, d, a, b, f[e + 14], 17, 2792965006), b = k(b, c, d, a, f[e + 15], 22, 1236535329), a = l(a, b, c, d, f[e + 1], 5, 4129170786), d = l(d, a, b, c, f[e + 6], 9, 3225465664), c = l(c, d, a, b, f[e + 11], 14, 643717713), b = l(b, c, d, a, f[e + 0], 20, 3921069994), a = l(a, b, c, d, f[e + 5], 5, 3593408605), d = l(d, a, b, c, f[e + 10], 9, 38016083), c = l(c, d, a, b, f[e + 15], 14, 3634488961), b = l(b, c, d, a, f[e + 4], 20, 3889429448), a = l(a, b, c, d, f[e + 9], 5, 568446438), d = l(d, a, b, c, f[e + 14], 9, 3275163606), c = l(c, d, a, b, f[e + 3], 14, 4107603335), b = l(b, c, d, a, f[e + 8], 20, 1163531501), a = l(a, b, c, d, f[e + 13], 5, 2850285829), d = l(d, a, b, c, f[e + 2], 9, 4243563512), c = l(c, d, a, b, f[e + 7], 14, 1735328473), b = l(b, c, d, a, f[e + 12], 20, 2368359562), a = m(a, b, c, d, f[e + 5], 4, 4294588738), d = m(d, a, b, c, f[e + 8], 11, 2272392833), c = m(c, d, a, b, f[e + 11], 16, 1839030562), b = m(b, c, d, a, f[e + 14], 23, 4259657740), a = m(a, b, c, d, f[e + 1], 4, 2763975236), d = m(d, a, b, c, f[e + 4], 11, 1272893353), c = m(c, d, a, b, f[e + 7], 16, 4139469664), b = m(b, c, d, a, f[e + 10], 23, 3200236656), a = m(a, b, c, d, f[e + 13], 4, 681279174), d = m(d, a, b, c, f[e + 0], 11, 3936430074), c = m(c, d, a, b, f[e + 3], 16, 3572445317), b = m(b, c, d, a, f[e + 6], 23, 76029189), a = m(a, b, c, d, f[e + 9], 4, 3654602809), d = m(d, a, b, c, f[e + 12], 11, 3873151461), c = m(c, d, a, b, f[e + 15], 16, 530742520), b = m(b, c, d, a, f[e + 2], 23, 3299628645), a = n(a, b, c, d, f[e + 0], 6, 4096336452), d = n(d, a, b, c, f[e + 7], 10, 1126891415), c = n(c, d, a, b, f[e + 14], 15, 2878612391), b = n(b, c, d, a, f[e + 5], 21, 4237533241), a = n(a, b, c, d, f[e + 12], 6, 1700485571), d = n(d, a, b, c, f[e + 3], 10, 2399980690), c = n(c, d, a, b, f[e + 10], 15, 4293915773), b = n(b, c, d, a, f[e + 1], 21, 2240044497), a = n(a, b, c, d, f[e + 8], 6, 1873313359), d = n(d, a, b, c, f[e + 15], 10, 4264355552), c = n(c, d, a, b, f[e + 6], 15, 2734768916), b = n(b, c, d, a, f[e + 13], 21, 1309151649), a = n(a, b, c, d, f[e + 4], 6, 4149444226), d = n(d, a, b, c, f[e + 11], 10, 3174756917), c = n(c, d, a, b, f[e + 2], 15, 718787259), b = n(b, c, d, a, f[e + 9], 21, 3951481745), a = h(a, q), b = h(b, r), c = h(c, s), d = h(d, t);
    return (p(a) + p(b) + p(c) + p(d)).toLowerCase()
};

我只需要支持支持类型化数组(DataView、ArrayBuffer等)的HTML5浏览器。 我想我取了Joseph Myers代码并修改它以支持在uint8数组中传递。我没有捕捉到所有的改进,可能还有一些char()数组工件可以改进。我需要这个来添加到pouchdb项目中。

var PouchUtils = {};
PouchUtils.Crypto = {};
(function () {
    PouchUtils.Crypto.MD5 = function (uint8Array) {
        function md5cycle(x, k) {
            var a = x[0], b = x[1], c = x[2], d = x[3];

            a = ff(a, b, c, d, k[0], 7, -680876936);
            d = ff(d, a, b, c, k[1], 12, -389564586);
            c = ff(c, d, a, b, k[2], 17, 606105819);
            b = ff(b, c, d, a, k[3], 22, -1044525330);
            a = ff(a, b, c, d, k[4], 7, -176418897);
            d = ff(d, a, b, c, k[5], 12, 1200080426);
            c = ff(c, d, a, b, k[6], 17, -1473231341);
            b = ff(b, c, d, a, k[7], 22, -45705983);
            a = ff(a, b, c, d, k[8], 7, 1770035416);
            d = ff(d, a, b, c, k[9], 12, -1958414417);
            c = ff(c, d, a, b, k[10], 17, -42063);
            b = ff(b, c, d, a, k[11], 22, -1990404162);
            a = ff(a, b, c, d, k[12], 7, 1804603682);
            d = ff(d, a, b, c, k[13], 12, -40341101);
            c = ff(c, d, a, b, k[14], 17, -1502002290);
            b = ff(b, c, d, a, k[15], 22, 1236535329);

            a = gg(a, b, c, d, k[1], 5, -165796510);
            d = gg(d, a, b, c, k[6], 9, -1069501632);
            c = gg(c, d, a, b, k[11], 14, 643717713);
            b = gg(b, c, d, a, k[0], 20, -373897302);
            a = gg(a, b, c, d, k[5], 5, -701558691);
            d = gg(d, a, b, c, k[10], 9, 38016083);
            c = gg(c, d, a, b, k[15], 14, -660478335);
            b = gg(b, c, d, a, k[4], 20, -405537848);
            a = gg(a, b, c, d, k[9], 5, 568446438);
            d = gg(d, a, b, c, k[14], 9, -1019803690);
            c = gg(c, d, a, b, k[3], 14, -187363961);
            b = gg(b, c, d, a, k[8], 20, 1163531501);
            a = gg(a, b, c, d, k[13], 5, -1444681467);
            d = gg(d, a, b, c, k[2], 9, -51403784);
            c = gg(c, d, a, b, k[7], 14, 1735328473);
            b = gg(b, c, d, a, k[12], 20, -1926607734);

            a = hh(a, b, c, d, k[5], 4, -378558);
            d = hh(d, a, b, c, k[8], 11, -2022574463);
            c = hh(c, d, a, b, k[11], 16, 1839030562);
            b = hh(b, c, d, a, k[14], 23, -35309556);
            a = hh(a, b, c, d, k[1], 4, -1530992060);
            d = hh(d, a, b, c, k[4], 11, 1272893353);
            c = hh(c, d, a, b, k[7], 16, -155497632);
            b = hh(b, c, d, a, k[10], 23, -1094730640);
            a = hh(a, b, c, d, k[13], 4, 681279174);
            d = hh(d, a, b, c, k[0], 11, -358537222);
            c = hh(c, d, a, b, k[3], 16, -722521979);
            b = hh(b, c, d, a, k[6], 23, 76029189);
            a = hh(a, b, c, d, k[9], 4, -640364487);
            d = hh(d, a, b, c, k[12], 11, -421815835);
            c = hh(c, d, a, b, k[15], 16, 530742520);
            b = hh(b, c, d, a, k[2], 23, -995338651);

            a = ii(a, b, c, d, k[0], 6, -198630844);
            d = ii(d, a, b, c, k[7], 10, 1126891415);
            c = ii(c, d, a, b, k[14], 15, -1416354905);
            b = ii(b, c, d, a, k[5], 21, -57434055);
            a = ii(a, b, c, d, k[12], 6, 1700485571);
            d = ii(d, a, b, c, k[3], 10, -1894986606);
            c = ii(c, d, a, b, k[10], 15, -1051523);
            b = ii(b, c, d, a, k[1], 21, -2054922799);
            a = ii(a, b, c, d, k[8], 6, 1873313359);
            d = ii(d, a, b, c, k[15], 10, -30611744);
            c = ii(c, d, a, b, k[6], 15, -1560198380);
            b = ii(b, c, d, a, k[13], 21, 1309151649);
            a = ii(a, b, c, d, k[4], 6, -145523070);
            d = ii(d, a, b, c, k[11], 10, -1120210379);
            c = ii(c, d, a, b, k[2], 15, 718787259);
            b = ii(b, c, d, a, k[9], 21, -343485551);

            x[0] = add32(a, x[0]);
            x[1] = add32(b, x[1]);
            x[2] = add32(c, x[2]);
            x[3] = add32(d, x[3]);

        }

        function cmn(q, a, b, x, s, t) {
            a = add32(add32(a, q), add32(x, t));
            return add32((a << s) | (a >>> (32 - s)), b);
        }

        function ff(a, b, c, d, x, s, t) {
            return cmn((b & c) | ((~b) & d), a, b, x, s, t);
        }

        function gg(a, b, c, d, x, s, t) {
            return cmn((b & d) | (c & (~d)), a, b, x, s, t);
        }

        function hh(a, b, c, d, x, s, t) {
            return cmn(b ^ c ^ d, a, b, x, s, t);
        }

        function ii(a, b, c, d, x, s, t) {
            return cmn(c ^ (b | (~d)), a, b, x, s, t);
        }

        function md51(s) {
            txt = '';
            var n = s.length,
            state = [1732584193, -271733879, -1732584194, 271733878], i;
            for (i = 64; i <= s.length; i += 64) {
                md5cycle(state, md5blk(s.subarray(i - 64, i)));
            }
            s = s.subarray(i - 64);
            var tail = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
            for (i = 0; i < s.length; i++)
                tail[i >> 2] |= s[i] << ((i % 4) << 3);
            tail[i >> 2] |= 0x80 << ((i % 4) << 3);
            if (i > 55) {
                md5cycle(state, tail);
                for (i = 0; i < 16; i++) tail[i] = 0;
            }
            tail[14] = n * 8;
            md5cycle(state, tail);
            return state;
        }

        /* there needs to be support for Unicode here,
         * unless we pretend that we can redefine the MD-5
         * algorithm for multi-byte characters (perhaps
         * by adding every four 16-bit characters and
         * shortening the sum to 32 bits). Otherwise
         * I suggest performing MD-5 as if every character
         * was two bytes--e.g., 0040 0025 = @%--but then
         * how will an ordinary MD-5 sum be matched?
         * There is no way to standardize text to something
         * like UTF-8 before transformation; speed cost is
         * utterly prohibitive. The JavaScript standard
         * itself needs to look at this: it should start
         * providing access to strings as preformed UTF-8
         * 8-bit unsigned value arrays.
         */
        function md5blk(s) { /* I figured global was faster.   */
            var md5blks = [], i; /* Andy King said do it this way. */
            for (i = 0; i < 64; i += 4) {
                md5blks[i >> 2] = s[i]
                + (s[i + 1] << 8)
                + (s[i + 2] << 16)
                + (s[i + 3] << 24);
            }
            return md5blks;
        }

        var hex_chr = '0123456789abcdef'.split('');

        function rhex(n) {
            var s = '', j = 0;
            for (; j < 4; j++)
                s += hex_chr[(n >> (j * 8 + 4)) & 0x0F]
                + hex_chr[(n >> (j * 8)) & 0x0F];
            return s;
        }

        function hex(x) {
            for (var i = 0; i < x.length; i++)
                x[i] = rhex(x[i]);
            return x.join('');
        }

        function md5(s) {
            return hex(md51(s));
        }

        function add32(a, b) {
            return (a + b) & 0xFFFFFFFF;
        }

        return md5(uint8Array);
    };
})();

目前最快实现MD5(基于Joseph Myers的代码):

https://github.com/iReal/FastMD5

jspef比较: http://jsperf.com/md5-shootout/63

我编写了测试来比较几个JavaScript哈希实现,包括这里提到的大多数MD5实现。 要运行测试,请转到 http://brillout.github.io/test-javascript-hash-implementations/ 稍等一下。

似乎 YaMD5 执行 R. Hill's answer 是最快的。

我发现一个既快速又支持Unicode字符串的实现,这让我很烦恼。

所以我做了一个支持Unicode字符串的 shows as faster (在写入时)比当前最快的纯ASCII字符串实现:

https://github.com/gorhill/yamd5.js

基于Joseph Myers的代码,但使用了typedarray,以及其他改进。

通过在图形卡上进行计算(在WebGL中实现哈希算法),应该可以更快地进行哈希,如关于sha256的讨论: Is it possible to calculate sha256 hashes in the browser using the user's video card, eg. by using WebGL or Flash?

js-md5 支持utf-8字符串、数组、arrayBuffer、amd….

而且速度快。 jsperf

为什么不试试 http://phpjs.org/functions/md5/ 是吗?

不幸的是,任何模拟脚本的性能都受到限制,但是这可以呈现真正的MD5哈希。尽管我建议不要使用MD5作为密码,因为它是一个快速呈现的哈希。

你也可以检查我的 md5 implementation . 它应该和上面贴的那张差不多。不幸的是,性能受到内部循环的限制,无法进一步优化。

如果您的应用程序的性能受到MD5的JavaScript实现的限制,那么您确实做了一些错误的事情。考虑架构更改(提示:不经常使用MD5)