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403 lines
15 KiB
JavaScript
403 lines
15 KiB
JavaScript
/*******************************************************************************
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YaMD5 - Yet another MD5 hasher.
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home: https://github.com/gorhill/yamd5.js
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I needed an MD5 hasher, and as usual I want small code base, and fast.
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Originally found md5-o-matic [1]. It was fast but did not work with Unicode
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strings. Also, eventually realized it was really based on code from
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Joseph Myers [2] with no proper credits given (not nice).
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Then I found SparkMD5 [3], which works with Unicode strings, but at a steep
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cost to performance. Also, glancing at the code I saw avoidable redundancies
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causing the code base to be much larger than needed.
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So from this point I set out to write my own version, YaMD5 (sorry, I am
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not good with naming projects), of course heavily relying on the original
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code from Joseph Myers [2], and bits from SparkMD5 -- I started to work from
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SparkMD5 implementation, so there might be bits of code original to SparkMD5
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code left in a few places (like say, MD5.end()).
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Advantages of YaMD5:
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- Can handle Unicode strings
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- Natively incremental
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- Small code base
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- Fastest MD5 hasher out there so far for large input [4]
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- Even faster than versions supporting only simpler ascii strings
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[1] https://github.com/trentmillar/md5-o-matic
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[2] http://www.myersdaily.org/joseph/javascript/md5-text.html
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[3] https://github.com/satazor/SparkMD5
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[4] http://jsperf.com/md5-shootout/75
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So with that said, I don't know what license covers Joseph Myers' code (need
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to find out). In any case, concerning whatever original code I contributed in
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there:
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The MIT License (MIT)
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Copyright (C) 2014 Raymond Hill
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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**/
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/* jshint bitwise: false */
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(function(root) {
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'use strict';
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/*
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* Fastest md5 implementation around (JKM md5)
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* Credits: Joseph Myers
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*
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* @see http://www.myersdaily.org/joseph/javascript/md5-text.html
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* @see http://jsperf.com/md5-shootout/7
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*/
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// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Operator_Precedence
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var md5cycle = function(x, k) {
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var a = x[0],
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b = x[1],
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c = x[2],
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d = x[3];
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// ff()
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a += (b & c | ~b & d) + k[0] - 680876936 | 0;
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a = (a << 7 | a >>> 25) + b | 0;
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d += (a & b | ~a & c) + k[1] - 389564586 | 0;
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d = (d << 12 | d >>> 20) + a | 0;
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c += (d & a | ~d & b) + k[2] + 606105819 | 0;
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c = (c << 17 | c >>> 15) + d | 0;
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b += (c & d | ~c & a) + k[3] - 1044525330 | 0;
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b = (b << 22 | b >>> 10) + c | 0;
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a += (b & c | ~b & d) + k[4] - 176418897 | 0;
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a = (a << 7 | a >>> 25) + b | 0;
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d += (a & b | ~a & c) + k[5] + 1200080426 | 0;
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d = (d << 12 | d >>> 20) + a | 0;
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c += (d & a | ~d & b) + k[6] - 1473231341 | 0;
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c = (c << 17 | c >>> 15) + d | 0;
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b += (c & d | ~c & a) + k[7] - 45705983 | 0;
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b = (b << 22 | b >>> 10) + c | 0;
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a += (b & c | ~b & d) + k[8] + 1770035416 | 0;
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a = (a << 7 | a >>> 25) + b | 0;
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d += (a & b | ~a & c) + k[9] - 1958414417 | 0;
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d = (d << 12 | d >>> 20) + a | 0;
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c += (d & a | ~d & b) + k[10] - 42063 | 0;
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c = (c << 17 | c >>> 15) + d | 0;
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b += (c & d | ~c & a) + k[11] - 1990404162 | 0;
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b = (b << 22 | b >>> 10) + c | 0;
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a += (b & c | ~b & d) + k[12] + 1804603682 | 0;
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a = (a << 7 | a >>> 25) + b | 0;
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d += (a & b | ~a & c) + k[13] - 40341101 | 0;
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d = (d << 12 | d >>> 20) + a | 0;
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c += (d & a | ~d & b) + k[14] - 1502002290 | 0;
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c = (c << 17 | c >>> 15) + d | 0;
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b += (c & d | ~c & a) + k[15] + 1236535329 | 0;
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b = (b << 22 | b >>> 10) + c | 0;
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// gg()
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a += (b & d | c & ~d) + k[1] - 165796510 | 0;
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a = (a << 5 | a >>> 27) + b | 0;
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d += (a & c | b & ~c) + k[6] - 1069501632 | 0;
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d = (d << 9 | d >>> 23) + a | 0;
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c += (d & b | a & ~b) + k[11] + 643717713 | 0;
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c = (c << 14 | c >>> 18) + d | 0;
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b += (c & a | d & ~a) + k[0] - 373897302 | 0;
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b = (b << 20 | b >>> 12) + c | 0;
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a += (b & d | c & ~d) + k[5] - 701558691 | 0;
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a = (a << 5 | a >>> 27) + b | 0;
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d += (a & c | b & ~c) + k[10] + 38016083 | 0;
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d = (d << 9 | d >>> 23) + a | 0;
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c += (d & b | a & ~b) + k[15] - 660478335 | 0;
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c = (c << 14 | c >>> 18) + d | 0;
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b += (c & a | d & ~a) + k[4] - 405537848 | 0;
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b = (b << 20 | b >>> 12) + c | 0;
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a += (b & d | c & ~d) + k[9] + 568446438 | 0;
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a = (a << 5 | a >>> 27) + b | 0;
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d += (a & c | b & ~c) + k[14] - 1019803690 | 0;
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d = (d << 9 | d >>> 23) + a | 0;
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c += (d & b | a & ~b) + k[3] - 187363961 | 0;
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c = (c << 14 | c >>> 18) + d | 0;
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b += (c & a | d & ~a) + k[8] + 1163531501 | 0;
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b = (b << 20 | b >>> 12) + c | 0;
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a += (b & d | c & ~d) + k[13] - 1444681467 | 0;
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a = (a << 5 | a >>> 27) + b | 0;
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d += (a & c | b & ~c) + k[2] - 51403784 | 0;
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d = (d << 9 | d >>> 23) + a | 0;
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c += (d & b | a & ~b) + k[7] + 1735328473 | 0;
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c = (c << 14 | c >>> 18) + d | 0;
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b += (c & a | d & ~a) + k[12] - 1926607734 | 0;
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b = (b << 20 | b >>> 12) + c | 0;
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// hh()
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a += (b ^ c ^ d) + k[5] - 378558 | 0;
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a = (a << 4 | a >>> 28) + b | 0;
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d += (a ^ b ^ c) + k[8] - 2022574463 | 0;
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d = (d << 11 | d >>> 21) + a | 0;
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c += (d ^ a ^ b) + k[11] + 1839030562 | 0;
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c = (c << 16 | c >>> 16) + d | 0;
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b += (c ^ d ^ a) + k[14] - 35309556 | 0;
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b = (b << 23 | b >>> 9) + c | 0;
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a += (b ^ c ^ d) + k[1] - 1530992060 | 0;
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a = (a << 4 | a >>> 28) + b | 0;
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d += (a ^ b ^ c) + k[4] + 1272893353 | 0;
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d = (d << 11 | d >>> 21) + a | 0;
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c += (d ^ a ^ b) + k[7] - 155497632 | 0;
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c = (c << 16 | c >>> 16) + d | 0;
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b += (c ^ d ^ a) + k[10] - 1094730640 | 0;
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b = (b << 23 | b >>> 9) + c | 0;
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a += (b ^ c ^ d) + k[13] + 681279174 | 0;
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a = (a << 4 | a >>> 28) + b | 0;
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d += (a ^ b ^ c) + k[0] - 358537222 | 0;
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d = (d << 11 | d >>> 21) + a | 0;
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c += (d ^ a ^ b) + k[3] - 722521979 | 0;
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c = (c << 16 | c >>> 16) + d | 0;
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b += (c ^ d ^ a) + k[6] + 76029189 | 0;
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b = (b << 23 | b >>> 9) + c | 0;
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a += (b ^ c ^ d) + k[9] - 640364487 | 0;
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a = (a << 4 | a >>> 28) + b | 0;
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d += (a ^ b ^ c) + k[12] - 421815835 | 0;
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d = (d << 11 | d >>> 21) + a | 0;
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c += (d ^ a ^ b) + k[15] + 530742520 | 0;
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c = (c << 16 | c >>> 16) + d | 0;
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b += (c ^ d ^ a) + k[2] - 995338651 | 0;
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b = (b << 23 | b >>> 9) + c | 0;
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// ii()
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a += (c ^ (b | ~d)) + k[0] - 198630844 | 0;
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a = (a << 6 | a >>> 26) + b | 0;
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d += (b ^ (a | ~c)) + k[7] + 1126891415 | 0;
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d = (d << 10 | d >>> 22) + a | 0;
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c += (a ^ (d | ~b)) + k[14] - 1416354905 | 0;
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c = (c << 15 | c >>> 17) + d | 0;
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b += (d ^ (c | ~a)) + k[5] - 57434055 | 0;
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b = (b << 21 |b >>> 11) + c | 0;
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a += (c ^ (b | ~d)) + k[12] + 1700485571 | 0;
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a = (a << 6 | a >>> 26) + b | 0;
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d += (b ^ (a | ~c)) + k[3] - 1894986606 | 0;
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d = (d << 10 | d >>> 22) + a | 0;
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c += (a ^ (d | ~b)) + k[10] - 1051523 | 0;
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c = (c << 15 | c >>> 17) + d | 0;
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b += (d ^ (c | ~a)) + k[1] - 2054922799 | 0;
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b = (b << 21 |b >>> 11) + c | 0;
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a += (c ^ (b | ~d)) + k[8] + 1873313359 | 0;
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a = (a << 6 | a >>> 26) + b | 0;
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d += (b ^ (a | ~c)) + k[15] - 30611744 | 0;
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d = (d << 10 | d >>> 22) + a | 0;
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c += (a ^ (d | ~b)) + k[6] - 1560198380 | 0;
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c = (c << 15 | c >>> 17) + d | 0;
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b += (d ^ (c | ~a)) + k[13] + 1309151649 | 0;
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b = (b << 21 |b >>> 11) + c | 0;
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a += (c ^ (b | ~d)) + k[4] - 145523070 | 0;
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a = (a << 6 | a >>> 26) + b | 0;
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d += (b ^ (a | ~c)) + k[11] - 1120210379 | 0;
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d = (d << 10 | d >>> 22) + a | 0;
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c += (a ^ (d | ~b)) + k[2] + 718787259 | 0;
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c = (c << 15 | c >>> 17) + d | 0;
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b += (d ^ (c | ~a)) + k[9] - 343485551 | 0;
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b = (b << 21 | b >>> 11) + c | 0;
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x[0] = a + x[0] | 0;
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x[1] = b + x[1] | 0;
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x[2] = c + x[2] | 0;
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x[3] = d + x[3] | 0;
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};
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var hexChars = '0123456789abcdef';
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var hexOut = [];
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var hex = function(x) {
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var hc = hexChars;
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var ho = hexOut;
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var n, offset, j;
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for (var i = 0; i < 4; i++) {
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offset = i * 8;
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n = x[i];
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for ( j = 0; j < 8; j += 2 ) {
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ho[offset+1+j] = hc.charAt(n & 0x0F);
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n >>>= 4;
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ho[offset+0+j] = hc.charAt(n & 0x0F);
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n >>>= 4;
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}
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}
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return ho.join('');
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};
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var MD5 = function() {
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this._dataLength = 0;
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this._state = new Int32Array(4);
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this._buffer = new ArrayBuffer(68);
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this._bufferLength = 0;
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this._buffer8 = new Uint8Array(this._buffer, 0, 68);
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this._buffer32 = new Uint32Array(this._buffer, 0, 17);
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this.start();
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};
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var stateIdentity = new Int32Array([1732584193, -271733879, -1732584194, 271733878]);
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var buffer32Identity = new Int32Array([0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]);
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// Char to code point to to array conversion:
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// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/charCodeAt#Example.3A_Fixing_charCodeAt_to_handle_non-Basic-Multilingual-Plane_characters_if_their_presence_earlier_in_the_string_is_unknown
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MD5.prototype.appendStr = function(str) {
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var buf8 = this._buffer8;
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var buf32 = this._buffer32;
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var bufLen = this._bufferLength;
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var code;
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for ( var i = 0; i < str.length; i++ ) {
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code = str.charCodeAt(i);
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if ( code < 128 ) {
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buf8[bufLen++] = code;
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} else if ( code < 0x800 ) {
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buf8[bufLen++] = (code >>> 6) + 0xC0;
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buf8[bufLen++] = code & 0x3F | 0x80;
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} else if ( code < 0xD800 || code > 0xDBFF ) {
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buf8[bufLen++] = (code >>> 12) + 0xE0;
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buf8[bufLen++] = (code >>> 6 & 0x3F) | 0x80;
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buf8[bufLen++] = (code & 0x3F) | 0x80;
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} else {
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code = ((code - 0xD800) * 0x400) + (str.charCodeAt(++i) - 0xDC00) + 0x10000;
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if ( code > 0x10FFFF ) {
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throw 'Unicode standard supports code points up to U+10FFFF';
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}
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buf8[bufLen++] = (code >>> 18) + 0xF0;
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buf8[bufLen++] = (code >>> 12 & 0x3F) | 0x80;
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buf8[bufLen++] = (code >>> 6 & 0x3F) | 0x80;
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buf8[bufLen++] = (code & 0x3F) | 0x80;
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}
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if ( bufLen >= 64 ) {
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this._dataLength += 64;
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md5cycle(this._state, buf32);
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bufLen -= 64;
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buf32[0] = buf32[16];
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}
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}
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this._bufferLength = bufLen;
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return this;
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};
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MD5.prototype.appendAsciiStr = function(str) {
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var buf8 = this._buffer8;
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var buf32 = this._buffer32;
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var bufLen = this._bufferLength;
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var i, j = 0;
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for (;;) {
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i = Math.min(str.length-j, 64-bufLen);
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while ( i-- ) {
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buf8[bufLen++] = str.charCodeAt(j++);
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}
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if ( bufLen < 64 ) {
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break;
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}
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this._dataLength += 64;
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md5cycle(this._state, buf32);
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bufLen = 0;
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}
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this._bufferLength = bufLen;
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return this;
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};
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MD5.prototype.appendByteArray = function(input) {
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var buf8 = this._buffer8;
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var buf32 = this._buffer32;
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var bufLen = this._bufferLength;
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var i, j = 0;
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for (;;) {
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i = Math.min(input.length-j, 64-bufLen);
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while ( i-- ) {
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buf8[bufLen++] = input[j++];
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}
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if ( bufLen < 64 ) {
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break;
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}
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this._dataLength += 64;
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md5cycle(this._state, buf32);
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bufLen = 0;
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}
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this._bufferLength = bufLen;
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return this;
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};
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MD5.prototype.start = function() {
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this._dataLength = 0;
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this._bufferLength = 0;
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this._state.set(stateIdentity);
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return this;
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};
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MD5.prototype.end = function(raw) {
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var bufLen = this._bufferLength;
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this._dataLength += bufLen;
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var buf8 = this._buffer8;
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buf8[bufLen] = 0x80;
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buf8[bufLen+1] = buf8[bufLen+2] = buf8[bufLen+3] = 0;
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var buf32 = this._buffer32;
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var i = (bufLen >> 2) + 1;
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buf32.set(buffer32Identity.subarray(i), i);
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if (bufLen > 55) {
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md5cycle(this._state, buf32);
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buf32.set(buffer32Identity);
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}
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// Do the final computation based on the tail and length
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// Beware that the final length may not fit in 32 bits so we take care of that
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var dataBitsLen = this._dataLength * 8;
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if ( dataBitsLen <= 0xFFFFFFFF ) {
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buf32[14] = dataBitsLen;
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} else {
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var matches = dataBitsLen.toString(16).match(/(.*?)(.{0,8})$/);
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var lo = parseInt(matches[2], 16);
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var hi = parseInt(matches[1], 16) || 0;
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buf32[14] = lo;
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buf32[15] = hi;
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}
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md5cycle(this._state, buf32);
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return !!raw ? this._state : hex(this._state);
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};
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// This permanent instance is to use for one-call hashing
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var onePassHasher = new MD5();
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MD5.hashStr = function(str, raw) {
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return onePassHasher
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.start()
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.appendStr(str)
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.end(raw);
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};
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MD5.hashAsciiStr = function(str, raw) {
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return onePassHasher
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.start()
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.appendAsciiStr(str)
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.end(raw);
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};
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// Self-test
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// In some cases the fast add32 function cannot be used..
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if ( MD5.hashStr('hello') !== '5d41402abc4b2a76b9719d911017c592' ) {
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console.error('YaMD5> this javascript engine does not support YaMD5. Sorry.');
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}
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if ( typeof root === 'object' ) {
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root.YaMD5 = MD5;
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}
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return MD5;
|
|
})(this);
|