246 lines
9.2 KiB
JavaScript
246 lines
9.2 KiB
JavaScript
/*
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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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* Additions by Michael Slusarz <slusarz@horde.org>
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* Removed all functions except those needed to do string->hex hashing &
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* enclosed in MD5 namespace.
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*
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* Requires prototype.js (v1.6.1+)
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*/
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window.MD5 = {
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hash: function(s)
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{
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return this.rstr2hex(this.rstr_md5(this.str2rstr_utf8(s)));
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},
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/* Calculate the MD5 of a raw string */
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rstr_md5: function(s)
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{
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return this.binl2rstr(this.binl_md5(this.rstr2binl(s), s.length * 8));
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},
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/* Convert a raw string to a hex string. */
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rstr2hex: function(input)
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{
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var i, x,
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hex_tab = "0123456789abcdef",
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output = "";
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for (i = 0; i < input.length; ++i) {
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x = input.charCodeAt(i);
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output += hex_tab.charAt((x >>> 4) & 0x0F) + hex_tab.charAt(x & 0x0F);
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}
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return output;
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},
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/* Encode a string as utf-8. For efficiency, this assumes the input is
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* valid utf-16. */
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str2rstr_utf8: function(input)
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{
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var x, y,
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i = -1,
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output = "";
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while (++i < input.length) {
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/* Decode utf-16 surrogate pairs */
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x = input.charCodeAt(i);
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y = i + 1 < input.length ? input.charCodeAt(i + 1) : 0;
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if (0xD800 <= x && x <= 0xDBFF && 0xDC00 <= y && y <= 0xDFFF) {
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x = 0x10000 + ((x & 0x03FF) << 10) + (y & 0x03FF);
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++i;
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}
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/* Encode output as utf-8 */
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if (x <= 0x7F) {
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output += String.fromCharCode(x);
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} else if (x <= 0x7FF) {
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output += String.fromCharCode(0xC0 | ((x >>> 6) & 0x1F), 0x80 | (x & 0x3F));
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} else if (x <= 0xFFFF) {
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output += String.fromCharCode(0xE0 | ((x >>> 12) & 0x0F), 0x80 | ((x >>> 6) & 0x3F), 0x80 | (x & 0x3F));
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} else if (x <= 0x1FFFFF) {
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output += String.fromCharCode(0xF0 | ((x >>> 18) & 0x07), 0x80 | ((x >>> 12) & 0x3F), 0x80 | ((x >>> 6) & 0x3F), 0x80 | (x & 0x3F));
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}
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}
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return output;
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},
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/* Convert a raw string to an array of little-endian words.
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* Characters >255 have their high-byte silently ignored. */
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rstr2binl: function(input)
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{
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var i,
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output = Array(input.length >> 2);
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for(i = 0; i < output.length; ++i) {
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output[i] = 0;
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}
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for (i = 0; i < input.length * 8; i += 8) {
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output[i>>5] |= (input.charCodeAt(i / 8) & 0xFF) << (i%32);
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}
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return output;
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},
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/* Convert an array of little-endian words to a string. */
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binl2rstr: function(input)
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{
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var i, output = "";
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for (i = 0; i < input.length * 32; i += 8) {
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output += String.fromCharCode((input[i>>5] >>> (i % 32)) & 0xFF);
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}
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return output;
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},
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/* Calculate the MD5 of an array of little-endian words, and a bit
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* length. */
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binl_md5: function(x, len)
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{
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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, olda, oldb, oldc, oldd,
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a = 1732584193,
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b = -271733879,
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c = -1732584194,
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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 = this.md5_ff(a, b, c, d, x[i+ 0], 7 , -680876936);
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d = this.md5_ff(d, a, b, c, x[i+ 1], 12, -389564586);
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c = this.md5_ff(c, d, a, b, x[i+ 2], 17, 606105819);
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b = this.md5_ff(b, c, d, a, x[i+ 3], 22, -1044525330);
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a = this.md5_ff(a, b, c, d, x[i+ 4], 7 , -176418897);
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d = this.md5_ff(d, a, b, c, x[i+ 5], 12, 1200080426);
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c = this.md5_ff(c, d, a, b, x[i+ 6], 17, -1473231341);
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b = this.md5_ff(b, c, d, a, x[i+ 7], 22, -45705983);
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a = this.md5_ff(a, b, c, d, x[i+ 8], 7 , 1770035416);
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d = this.md5_ff(d, a, b, c, x[i+ 9], 12, -1958414417);
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c = this.md5_ff(c, d, a, b, x[i+10], 17, -42063);
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b = this.md5_ff(b, c, d, a, x[i+11], 22, -1990404162);
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a = this.md5_ff(a, b, c, d, x[i+12], 7 , 1804603682);
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d = this.md5_ff(d, a, b, c, x[i+13], 12, -40341101);
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c = this.md5_ff(c, d, a, b, x[i+14], 17, -1502002290);
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b = this.md5_ff(b, c, d, a, x[i+15], 22, 1236535329);
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a = this.md5_gg(a, b, c, d, x[i+ 1], 5 , -165796510);
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d = this.md5_gg(d, a, b, c, x[i+ 6], 9 , -1069501632);
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c = this.md5_gg(c, d, a, b, x[i+11], 14, 643717713);
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b = this.md5_gg(b, c, d, a, x[i+ 0], 20, -373897302);
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a = this.md5_gg(a, b, c, d, x[i+ 5], 5 , -701558691);
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d = this.md5_gg(d, a, b, c, x[i+10], 9 , 38016083);
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c = this.md5_gg(c, d, a, b, x[i+15], 14, -660478335);
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b = this.md5_gg(b, c, d, a, x[i+ 4], 20, -405537848);
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a = this.md5_gg(a, b, c, d, x[i+ 9], 5 , 568446438);
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d = this.md5_gg(d, a, b, c, x[i+14], 9 , -1019803690);
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c = this.md5_gg(c, d, a, b, x[i+ 3], 14, -187363961);
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b = this.md5_gg(b, c, d, a, x[i+ 8], 20, 1163531501);
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a = this.md5_gg(a, b, c, d, x[i+13], 5 , -1444681467);
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d = this.md5_gg(d, a, b, c, x[i+ 2], 9 , -51403784);
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c = this.md5_gg(c, d, a, b, x[i+ 7], 14, 1735328473);
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b = this.md5_gg(b, c, d, a, x[i+12], 20, -1926607734);
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a = this.md5_hh(a, b, c, d, x[i+ 5], 4 , -378558);
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d = this.md5_hh(d, a, b, c, x[i+ 8], 11, -2022574463);
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c = this.md5_hh(c, d, a, b, x[i+11], 16, 1839030562);
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b = this.md5_hh(b, c, d, a, x[i+14], 23, -35309556);
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a = this.md5_hh(a, b, c, d, x[i+ 1], 4 , -1530992060);
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d = this.md5_hh(d, a, b, c, x[i+ 4], 11, 1272893353);
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c = this.md5_hh(c, d, a, b, x[i+ 7], 16, -155497632);
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b = this.md5_hh(b, c, d, a, x[i+10], 23, -1094730640);
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a = this.md5_hh(a, b, c, d, x[i+13], 4 , 681279174);
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d = this.md5_hh(d, a, b, c, x[i+ 0], 11, -358537222);
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c = this.md5_hh(c, d, a, b, x[i+ 3], 16, -722521979);
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b = this.md5_hh(b, c, d, a, x[i+ 6], 23, 76029189);
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a = this.md5_hh(a, b, c, d, x[i+ 9], 4 , -640364487);
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d = this.md5_hh(d, a, b, c, x[i+12], 11, -421815835);
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c = this.md5_hh(c, d, a, b, x[i+15], 16, 530742520);
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b = this.md5_hh(b, c, d, a, x[i+ 2], 23, -995338651);
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a = this.md5_ii(a, b, c, d, x[i+ 0], 6 , -198630844);
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d = this.md5_ii(d, a, b, c, x[i+ 7], 10, 1126891415);
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c = this.md5_ii(c, d, a, b, x[i+14], 15, -1416354905);
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b = this.md5_ii(b, c, d, a, x[i+ 5], 21, -57434055);
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a = this.md5_ii(a, b, c, d, x[i+12], 6 , 1700485571);
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d = this.md5_ii(d, a, b, c, x[i+ 3], 10, -1894986606);
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c = this.md5_ii(c, d, a, b, x[i+10], 15, -1051523);
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b = this.md5_ii(b, c, d, a, x[i+ 1], 21, -2054922799);
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a = this.md5_ii(a, b, c, d, x[i+ 8], 6 , 1873313359);
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d = this.md5_ii(d, a, b, c, x[i+15], 10, -30611744);
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c = this.md5_ii(c, d, a, b, x[i+ 6], 15, -1560198380);
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b = this.md5_ii(b, c, d, a, x[i+13], 21, 1309151649);
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a = this.md5_ii(a, b, c, d, x[i+ 4], 6 , -145523070);
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d = this.md5_ii(d, a, b, c, x[i+11], 10, -1120210379);
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c = this.md5_ii(c, d, a, b, x[i+ 2], 15, 718787259);
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b = this.md5_ii(b, c, d, a, x[i+ 9], 21, -343485551);
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a = this.safe_add(a, olda);
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b = this.safe_add(b, oldb);
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c = this.safe_add(c, oldc);
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d = this.safe_add(d, oldd);
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}
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return Array(a, b, c, d);
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},
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/* These functions implement the four basic operations the algorithm
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* uses. */
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md5_cmn: function(q, a, b, x, s, t)
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{
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return this.safe_add(this.bit_rol(this.safe_add(this.safe_add(a, q), this.safe_add(x, t)), s),b);
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},
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md5_ff: function(a, b, c, d, x, s, t)
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{
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return this.md5_cmn((b & c) | ((~b) & d), a, b, x, s, t);
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},
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md5_gg: function(a, b, c, d, x, s, t)
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{
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return this.md5_cmn((b & d) | (c & (~d)), a, b, x, s, t);
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},
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md5_hh: function(a, b, c, d, x, s, t)
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{
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return this.md5_cmn(b ^ c ^ d, a, b, x, s, t);
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},
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md5_ii: function(a, b, c, d, x, s, t)
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{
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return this.md5_cmn(c ^ (b | (~d)), a, b, x, s, t);
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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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safe_add: function(x, y)
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{
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var lsw = (x & 0xFFFF) + (y & 0xFFFF),
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msw = (x >> 16) + (y >> 16) + (lsw >> 16);
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return (msw << 16) | (lsw & 0xFFFF);
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},
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/* Bitwise rotate a 32-bit number to the left. */
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bit_rol: function(num, cnt)
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{
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return (num << cnt) | (num >>> (32 - cnt));
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}
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};
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