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217 lines
6.7 KiB
JavaScript
217 lines
6.7 KiB
JavaScript
/*
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* Browser-compatible JavaScript MD5
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*
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* Modification of JavaScript MD5
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* https://github.com/blueimp/JavaScript-MD5
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*
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* Copyright 2011, Sebastian Tschan
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* https://blueimp.net
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*
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* Licensed under the MIT license:
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* https://opensource.org/licenses/MIT
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*
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* Based on
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* A JavaScript implementation of the RSA Data Security, Inc. MD5 Message
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* Digest Algorithm, as defined in RFC 1321.
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* Version 2.2 Copyright (C) Paul Johnston 1999 - 2009
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* Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
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* Distributed under the BSD License
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* See http://pajhome.org.uk/crypt/md5 for more info.
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*/
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'use strict';
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function md5(bytes) {
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if (typeof(bytes) == 'string') {
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var msg = unescape(encodeURIComponent(bytes)); // UTF8 escape
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bytes = new Array(msg.length);
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for (var i = 0; i < msg.length; i++) bytes[i] = msg.charCodeAt(i);
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}
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return md5ToHexEncodedArray(
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wordsToMd5(
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bytesToWords(bytes)
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, bytes.length * 8)
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);
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}
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/*
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* Convert an array of little-endian words to an array of bytes
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*/
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function md5ToHexEncodedArray(input) {
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var i;
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var x;
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var output = [];
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var length32 = input.length * 32;
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var hexTab = '0123456789abcdef';
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var hex;
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for (i = 0; i < length32; i += 8) {
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x = (input[i >> 5] >>> (i % 32)) & 0xFF;
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hex = parseInt(hexTab.charAt((x >>> 4) & 0x0F) + hexTab.charAt(x & 0x0F), 16);
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output.push(hex);
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}
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return output;
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}
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/*
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* Calculate the MD5 of an array of little-endian words, and a bit length.
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*/
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function wordsToMd5(x, len) {
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/* append padding */
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x[len >> 5] |= 0x80 << (len % 32);
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x[(((len + 64) >>> 9) << 4) + 14] = len;
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var i;
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var olda;
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var oldb;
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var oldc;
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var oldd;
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var a = 1732584193;
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var b = -271733879;
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var c = -1732584194;
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var d = 271733878;
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for (i = 0; i < x.length; i += 16) {
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olda = a;
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oldb = b;
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oldc = c;
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oldd = d;
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a = md5ff(a, b, c, d, x[i], 7, -680876936);
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d = md5ff(d, a, b, c, x[i + 1], 12, -389564586);
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c = md5ff(c, d, a, b, x[i + 2], 17, 606105819);
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b = md5ff(b, c, d, a, x[i + 3], 22, -1044525330);
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a = md5ff(a, b, c, d, x[i + 4], 7, -176418897);
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d = md5ff(d, a, b, c, x[i + 5], 12, 1200080426);
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c = md5ff(c, d, a, b, x[i + 6], 17, -1473231341);
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b = md5ff(b, c, d, a, x[i + 7], 22, -45705983);
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a = md5ff(a, b, c, d, x[i + 8], 7, 1770035416);
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d = md5ff(d, a, b, c, x[i + 9], 12, -1958414417);
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c = md5ff(c, d, a, b, x[i + 10], 17, -42063);
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b = md5ff(b, c, d, a, x[i + 11], 22, -1990404162);
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a = md5ff(a, b, c, d, x[i + 12], 7, 1804603682);
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d = md5ff(d, a, b, c, x[i + 13], 12, -40341101);
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c = md5ff(c, d, a, b, x[i + 14], 17, -1502002290);
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b = md5ff(b, c, d, a, x[i + 15], 22, 1236535329);
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a = md5gg(a, b, c, d, x[i + 1], 5, -165796510);
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d = md5gg(d, a, b, c, x[i + 6], 9, -1069501632);
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c = md5gg(c, d, a, b, x[i + 11], 14, 643717713);
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b = md5gg(b, c, d, a, x[i], 20, -373897302);
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a = md5gg(a, b, c, d, x[i + 5], 5, -701558691);
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d = md5gg(d, a, b, c, x[i + 10], 9, 38016083);
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c = md5gg(c, d, a, b, x[i + 15], 14, -660478335);
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b = md5gg(b, c, d, a, x[i + 4], 20, -405537848);
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a = md5gg(a, b, c, d, x[i + 9], 5, 568446438);
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d = md5gg(d, a, b, c, x[i + 14], 9, -1019803690);
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c = md5gg(c, d, a, b, x[i + 3], 14, -187363961);
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b = md5gg(b, c, d, a, x[i + 8], 20, 1163531501);
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a = md5gg(a, b, c, d, x[i + 13], 5, -1444681467);
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d = md5gg(d, a, b, c, x[i + 2], 9, -51403784);
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c = md5gg(c, d, a, b, x[i + 7], 14, 1735328473);
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b = md5gg(b, c, d, a, x[i + 12], 20, -1926607734);
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a = md5hh(a, b, c, d, x[i + 5], 4, -378558);
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d = md5hh(d, a, b, c, x[i + 8], 11, -2022574463);
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c = md5hh(c, d, a, b, x[i + 11], 16, 1839030562);
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b = md5hh(b, c, d, a, x[i + 14], 23, -35309556);
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a = md5hh(a, b, c, d, x[i + 1], 4, -1530992060);
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d = md5hh(d, a, b, c, x[i + 4], 11, 1272893353);
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c = md5hh(c, d, a, b, x[i + 7], 16, -155497632);
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b = md5hh(b, c, d, a, x[i + 10], 23, -1094730640);
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a = md5hh(a, b, c, d, x[i + 13], 4, 681279174);
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d = md5hh(d, a, b, c, x[i], 11, -358537222);
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c = md5hh(c, d, a, b, x[i + 3], 16, -722521979);
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b = md5hh(b, c, d, a, x[i + 6], 23, 76029189);
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a = md5hh(a, b, c, d, x[i + 9], 4, -640364487);
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d = md5hh(d, a, b, c, x[i + 12], 11, -421815835);
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c = md5hh(c, d, a, b, x[i + 15], 16, 530742520);
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b = md5hh(b, c, d, a, x[i + 2], 23, -995338651);
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a = md5ii(a, b, c, d, x[i], 6, -198630844);
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d = md5ii(d, a, b, c, x[i + 7], 10, 1126891415);
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c = md5ii(c, d, a, b, x[i + 14], 15, -1416354905);
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b = md5ii(b, c, d, a, x[i + 5], 21, -57434055);
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a = md5ii(a, b, c, d, x[i + 12], 6, 1700485571);
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d = md5ii(d, a, b, c, x[i + 3], 10, -1894986606);
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c = md5ii(c, d, a, b, x[i + 10], 15, -1051523);
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b = md5ii(b, c, d, a, x[i + 1], 21, -2054922799);
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a = md5ii(a, b, c, d, x[i + 8], 6, 1873313359);
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d = md5ii(d, a, b, c, x[i + 15], 10, -30611744);
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c = md5ii(c, d, a, b, x[i + 6], 15, -1560198380);
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b = md5ii(b, c, d, a, x[i + 13], 21, 1309151649);
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a = md5ii(a, b, c, d, x[i + 4], 6, -145523070);
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d = md5ii(d, a, b, c, x[i + 11], 10, -1120210379);
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c = md5ii(c, d, a, b, x[i + 2], 15, 718787259);
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b = md5ii(b, c, d, a, x[i + 9], 21, -343485551);
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a = safeAdd(a, olda);
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b = safeAdd(b, oldb);
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c = safeAdd(c, oldc);
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d = safeAdd(d, oldd);
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}
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return [a, b, c, d];
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}
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/*
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* Convert an array bytes to an array of little-endian words
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* Characters >255 have their high-byte silently ignored.
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*/
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function bytesToWords(input) {
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var i;
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var output = [];
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output[(input.length >> 2) - 1] = undefined;
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for (i = 0; i < output.length; i += 1) {
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output[i] = 0;
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}
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var length8 = input.length * 8;
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for (i = 0; i < length8; i += 8) {
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output[i >> 5] |= (input[(i / 8)] & 0xFF) << (i % 32);
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}
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return output;
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}
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/*
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* Add integers, wrapping at 2^32. This uses 16-bit operations internally
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* to work around bugs in some JS interpreters.
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*/
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function safeAdd(x, y) {
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var lsw = (x & 0xFFFF) + (y & 0xFFFF);
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var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
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return (msw << 16) | (lsw & 0xFFFF);
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}
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/*
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* Bitwise rotate a 32-bit number to the left.
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*/
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function bitRotateLeft(num, cnt) {
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return (num << cnt) | (num >>> (32 - cnt));
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}
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/*
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* These functions implement the four basic operations the algorithm uses.
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*/
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function md5cmn(q, a, b, x, s, t) {
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return safeAdd(bitRotateLeft(safeAdd(safeAdd(a, q), safeAdd(x, t)), s), b);
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}
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function md5ff(a, b, c, d, x, s, t) {
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return md5cmn((b & c) | ((~b) & d), a, b, x, s, t);
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}
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function md5gg(a, b, c, d, x, s, t) {
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return md5cmn((b & d) | (c & (~d)), a, b, x, s, t);
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}
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function md5hh(a, b, c, d, x, s, t) {
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return md5cmn(b ^ c ^ d, a, b, x, s, t);
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}
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function md5ii(a, b, c, d, x, s, t) {
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return md5cmn(c ^ (b | (~d)), a, b, x, s, t);
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}
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module.exports = md5;
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