Add true repetition detection
[vchess.git] / public / javascripts / utils / md5.js
CommitLineData
331fc58c
BA
1/*
2 * A JavaScript implementation of the RSA Data Security, Inc. MD5 Message
3 * Digest Algorithm, as defined in RFC 1321.
4 * Version 2.2 Copyright (C) Paul Johnston 1999 - 2009
5 * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
6 * Distributed under the BSD License
7 * See http://pajhome.org.uk/crypt/md5 for more info.
8 */
9
10/*
11 * Configurable variables. You may need to tweak these to be compatible with
12 * the server-side, but the defaults work in most cases.
13 */
14var hexcase = 0; /* hex output format. 0 - lowercase; 1 - uppercase */
15var b64pad = ""; /* base-64 pad character. "=" for strict RFC compliance */
16
17/*
18 * These are the functions you'll usually want to call
19 * They take string arguments and return either hex or base-64 encoded strings
20 */
21function hex_md5(s) { return rstr2hex(rstr_md5(str2rstr_utf8(s))); }
22function b64_md5(s) { return rstr2b64(rstr_md5(str2rstr_utf8(s))); }
23function any_md5(s, e) { return rstr2any(rstr_md5(str2rstr_utf8(s)), e); }
24function hex_hmac_md5(k, d)
25 { return rstr2hex(rstr_hmac_md5(str2rstr_utf8(k), str2rstr_utf8(d))); }
26function b64_hmac_md5(k, d)
27 { return rstr2b64(rstr_hmac_md5(str2rstr_utf8(k), str2rstr_utf8(d))); }
28function any_hmac_md5(k, d, e)
29 { return rstr2any(rstr_hmac_md5(str2rstr_utf8(k), str2rstr_utf8(d)), e); }
30
31/*
32 * Perform a simple self-test to see if the VM is working
33 */
34function md5_vm_test()
35{
36 return hex_md5("abc").toLowerCase() == "900150983cd24fb0d6963f7d28e17f72";
37}
38
39/*
40 * Calculate the MD5 of a raw string
41 */
42function rstr_md5(s)
43{
44 return binl2rstr(binl_md5(rstr2binl(s), s.length * 8));
45}
46
47/*
48 * Calculate the HMAC-MD5, of a key and some data (raw strings)
49 */
50function rstr_hmac_md5(key, data)
51{
52 var bkey = rstr2binl(key);
53 if(bkey.length > 16) bkey = binl_md5(bkey, key.length * 8);
54
55 var ipad = Array(16), opad = Array(16);
56 for(var i = 0; i < 16; i++)
57 {
58 ipad[i] = bkey[i] ^ 0x36363636;
59 opad[i] = bkey[i] ^ 0x5C5C5C5C;
60 }
61
62 var hash = binl_md5(ipad.concat(rstr2binl(data)), 512 + data.length * 8);
63 return binl2rstr(binl_md5(opad.concat(hash), 512 + 128));
64}
65
66/*
67 * Convert a raw string to a hex string
68 */
69function rstr2hex(input)
70{
71 try { hexcase } catch(e) { hexcase=0; }
72 var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
73 var output = "";
74 var x;
75 for(var i = 0; i < input.length; i++)
76 {
77 x = input.charCodeAt(i);
78 output += hex_tab.charAt((x >>> 4) & 0x0F)
79 + hex_tab.charAt( x & 0x0F);
80 }
81 return output;
82}
83
84/*
85 * Convert a raw string to a base-64 string
86 */
87function rstr2b64(input)
88{
89 try { b64pad } catch(e) { b64pad=''; }
90 var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
91 var output = "";
92 var len = input.length;
93 for(var i = 0; i < len; i += 3)
94 {
95 var triplet = (input.charCodeAt(i) << 16)
96 | (i + 1 < len ? input.charCodeAt(i+1) << 8 : 0)
97 | (i + 2 < len ? input.charCodeAt(i+2) : 0);
98 for(var j = 0; j < 4; j++)
99 {
100 if(i * 8 + j * 6 > input.length * 8) output += b64pad;
101 else output += tab.charAt((triplet >>> 6*(3-j)) & 0x3F);
102 }
103 }
104 return output;
105}
106
107/*
108 * Convert a raw string to an arbitrary string encoding
109 */
110function rstr2any(input, encoding)
111{
112 var divisor = encoding.length;
113 var i, j, q, x, quotient;
114
115 /* Convert to an array of 16-bit big-endian values, forming the dividend */
116 var dividend = Array(Math.ceil(input.length / 2));
117 for(i = 0; i < dividend.length; i++)
118 {
119 dividend[i] = (input.charCodeAt(i * 2) << 8) | input.charCodeAt(i * 2 + 1);
120 }
121
122 /*
123 * Repeatedly perform a long division. The binary array forms the dividend,
124 * the length of the encoding is the divisor. Once computed, the quotient
125 * forms the dividend for the next step. All remainders are stored for later
126 * use.
127 */
128 var full_length = Math.ceil(input.length * 8 /
129 (Math.log(encoding.length) / Math.log(2)));
130 var remainders = Array(full_length);
131 for(j = 0; j < full_length; j++)
132 {
133 quotient = Array();
134 x = 0;
135 for(i = 0; i < dividend.length; i++)
136 {
137 x = (x << 16) + dividend[i];
138 q = Math.floor(x / divisor);
139 x -= q * divisor;
140 if(quotient.length > 0 || q > 0)
141 quotient[quotient.length] = q;
142 }
143 remainders[j] = x;
144 dividend = quotient;
145 }
146
147 /* Convert the remainders to the output string */
148 var output = "";
149 for(i = remainders.length - 1; i >= 0; i--)
150 output += encoding.charAt(remainders[i]);
151
152 return output;
153}
154
155/*
156 * Encode a string as utf-8.
157 * For efficiency, this assumes the input is valid utf-16.
158 */
159function str2rstr_utf8(input)
160{
161 var output = "";
162 var i = -1;
163 var x, y;
164
165 while(++i < input.length)
166 {
167 /* Decode utf-16 surrogate pairs */
168 x = input.charCodeAt(i);
169 y = i + 1 < input.length ? input.charCodeAt(i + 1) : 0;
170 if(0xD800 <= x && x <= 0xDBFF && 0xDC00 <= y && y <= 0xDFFF)
171 {
172 x = 0x10000 + ((x & 0x03FF) << 10) + (y & 0x03FF);
173 i++;
174 }
175
176 /* Encode output as utf-8 */
177 if(x <= 0x7F)
178 output += String.fromCharCode(x);
179 else if(x <= 0x7FF)
180 output += String.fromCharCode(0xC0 | ((x >>> 6 ) & 0x1F),
181 0x80 | ( x & 0x3F));
182 else if(x <= 0xFFFF)
183 output += String.fromCharCode(0xE0 | ((x >>> 12) & 0x0F),
184 0x80 | ((x >>> 6 ) & 0x3F),
185 0x80 | ( x & 0x3F));
186 else if(x <= 0x1FFFFF)
187 output += String.fromCharCode(0xF0 | ((x >>> 18) & 0x07),
188 0x80 | ((x >>> 12) & 0x3F),
189 0x80 | ((x >>> 6 ) & 0x3F),
190 0x80 | ( x & 0x3F));
191 }
192 return output;
193}
194
195/*
196 * Encode a string as utf-16
197 */
198function str2rstr_utf16le(input)
199{
200 var output = "";
201 for(var i = 0; i < input.length; i++)
202 output += String.fromCharCode( input.charCodeAt(i) & 0xFF,
203 (input.charCodeAt(i) >>> 8) & 0xFF);
204 return output;
205}
206
207function str2rstr_utf16be(input)
208{
209 var output = "";
210 for(var i = 0; i < input.length; i++)
211 output += String.fromCharCode((input.charCodeAt(i) >>> 8) & 0xFF,
212 input.charCodeAt(i) & 0xFF);
213 return output;
214}
215
216/*
217 * Convert a raw string to an array of little-endian words
218 * Characters >255 have their high-byte silently ignored.
219 */
220function rstr2binl(input)
221{
222 var output = Array(input.length >> 2);
223 for(var i = 0; i < output.length; i++)
224 output[i] = 0;
225 for(var i = 0; i < input.length * 8; i += 8)
226 output[i>>5] |= (input.charCodeAt(i / 8) & 0xFF) << (i%32);
227 return output;
228}
229
230/*
231 * Convert an array of little-endian words to a string
232 */
233function binl2rstr(input)
234{
235 var output = "";
236 for(var i = 0; i < input.length * 32; i += 8)
237 output += String.fromCharCode((input[i>>5] >>> (i % 32)) & 0xFF);
238 return output;
239}
240
241/*
242 * Calculate the MD5 of an array of little-endian words, and a bit length.
243 */
244function binl_md5(x, len)
245{
246 /* append padding */
247 x[len >> 5] |= 0x80 << ((len) % 32);
248 x[(((len + 64) >>> 9) << 4) + 14] = len;
249
250 var a = 1732584193;
251 var b = -271733879;
252 var c = -1732584194;
253 var d = 271733878;
254
255 for(var i = 0; i < x.length; i += 16)
256 {
257 var olda = a;
258 var oldb = b;
259 var oldc = c;
260 var oldd = d;
261
262 a = md5_ff(a, b, c, d, x[i+ 0], 7 , -680876936);
263 d = md5_ff(d, a, b, c, x[i+ 1], 12, -389564586);
264 c = md5_ff(c, d, a, b, x[i+ 2], 17, 606105819);
265 b = md5_ff(b, c, d, a, x[i+ 3], 22, -1044525330);
266 a = md5_ff(a, b, c, d, x[i+ 4], 7 , -176418897);
267 d = md5_ff(d, a, b, c, x[i+ 5], 12, 1200080426);
268 c = md5_ff(c, d, a, b, x[i+ 6], 17, -1473231341);
269 b = md5_ff(b, c, d, a, x[i+ 7], 22, -45705983);
270 a = md5_ff(a, b, c, d, x[i+ 8], 7 , 1770035416);
271 d = md5_ff(d, a, b, c, x[i+ 9], 12, -1958414417);
272 c = md5_ff(c, d, a, b, x[i+10], 17, -42063);
273 b = md5_ff(b, c, d, a, x[i+11], 22, -1990404162);
274 a = md5_ff(a, b, c, d, x[i+12], 7 , 1804603682);
275 d = md5_ff(d, a, b, c, x[i+13], 12, -40341101);
276 c = md5_ff(c, d, a, b, x[i+14], 17, -1502002290);
277 b = md5_ff(b, c, d, a, x[i+15], 22, 1236535329);
278
279 a = md5_gg(a, b, c, d, x[i+ 1], 5 , -165796510);
280 d = md5_gg(d, a, b, c, x[i+ 6], 9 , -1069501632);
281 c = md5_gg(c, d, a, b, x[i+11], 14, 643717713);
282 b = md5_gg(b, c, d, a, x[i+ 0], 20, -373897302);
283 a = md5_gg(a, b, c, d, x[i+ 5], 5 , -701558691);
284 d = md5_gg(d, a, b, c, x[i+10], 9 , 38016083);
285 c = md5_gg(c, d, a, b, x[i+15], 14, -660478335);
286 b = md5_gg(b, c, d, a, x[i+ 4], 20, -405537848);
287 a = md5_gg(a, b, c, d, x[i+ 9], 5 , 568446438);
288 d = md5_gg(d, a, b, c, x[i+14], 9 , -1019803690);
289 c = md5_gg(c, d, a, b, x[i+ 3], 14, -187363961);
290 b = md5_gg(b, c, d, a, x[i+ 8], 20, 1163531501);
291 a = md5_gg(a, b, c, d, x[i+13], 5 , -1444681467);
292 d = md5_gg(d, a, b, c, x[i+ 2], 9 , -51403784);
293 c = md5_gg(c, d, a, b, x[i+ 7], 14, 1735328473);
294 b = md5_gg(b, c, d, a, x[i+12], 20, -1926607734);
295
296 a = md5_hh(a, b, c, d, x[i+ 5], 4 , -378558);
297 d = md5_hh(d, a, b, c, x[i+ 8], 11, -2022574463);
298 c = md5_hh(c, d, a, b, x[i+11], 16, 1839030562);
299 b = md5_hh(b, c, d, a, x[i+14], 23, -35309556);
300 a = md5_hh(a, b, c, d, x[i+ 1], 4 , -1530992060);
301 d = md5_hh(d, a, b, c, x[i+ 4], 11, 1272893353);
302 c = md5_hh(c, d, a, b, x[i+ 7], 16, -155497632);
303 b = md5_hh(b, c, d, a, x[i+10], 23, -1094730640);
304 a = md5_hh(a, b, c, d, x[i+13], 4 , 681279174);
305 d = md5_hh(d, a, b, c, x[i+ 0], 11, -358537222);
306 c = md5_hh(c, d, a, b, x[i+ 3], 16, -722521979);
307 b = md5_hh(b, c, d, a, x[i+ 6], 23, 76029189);
308 a = md5_hh(a, b, c, d, x[i+ 9], 4 , -640364487);
309 d = md5_hh(d, a, b, c, x[i+12], 11, -421815835);
310 c = md5_hh(c, d, a, b, x[i+15], 16, 530742520);
311 b = md5_hh(b, c, d, a, x[i+ 2], 23, -995338651);
312
313 a = md5_ii(a, b, c, d, x[i+ 0], 6 , -198630844);
314 d = md5_ii(d, a, b, c, x[i+ 7], 10, 1126891415);
315 c = md5_ii(c, d, a, b, x[i+14], 15, -1416354905);
316 b = md5_ii(b, c, d, a, x[i+ 5], 21, -57434055);
317 a = md5_ii(a, b, c, d, x[i+12], 6 , 1700485571);
318 d = md5_ii(d, a, b, c, x[i+ 3], 10, -1894986606);
319 c = md5_ii(c, d, a, b, x[i+10], 15, -1051523);
320 b = md5_ii(b, c, d, a, x[i+ 1], 21, -2054922799);
321 a = md5_ii(a, b, c, d, x[i+ 8], 6 , 1873313359);
322 d = md5_ii(d, a, b, c, x[i+15], 10, -30611744);
323 c = md5_ii(c, d, a, b, x[i+ 6], 15, -1560198380);
324 b = md5_ii(b, c, d, a, x[i+13], 21, 1309151649);
325 a = md5_ii(a, b, c, d, x[i+ 4], 6 , -145523070);
326 d = md5_ii(d, a, b, c, x[i+11], 10, -1120210379);
327 c = md5_ii(c, d, a, b, x[i+ 2], 15, 718787259);
328 b = md5_ii(b, c, d, a, x[i+ 9], 21, -343485551);
329
330 a = safe_add(a, olda);
331 b = safe_add(b, oldb);
332 c = safe_add(c, oldc);
333 d = safe_add(d, oldd);
334 }
335 return Array(a, b, c, d);
336}
337
338/*
339 * These functions implement the four basic operations the algorithm uses.
340 */
341function md5_cmn(q, a, b, x, s, t)
342{
343 return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s),b);
344}
345function md5_ff(a, b, c, d, x, s, t)
346{
347 return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t);
348}
349function md5_gg(a, b, c, d, x, s, t)
350{
351 return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t);
352}
353function md5_hh(a, b, c, d, x, s, t)
354{
355 return md5_cmn(b ^ c ^ d, a, b, x, s, t);
356}
357function md5_ii(a, b, c, d, x, s, t)
358{
359 return md5_cmn(c ^ (b | (~d)), a, b, x, s, t);
360}
361
362/*
363 * Add integers, wrapping at 2^32. This uses 16-bit operations internally
364 * to work around bugs in some JS interpreters.
365 */
366function safe_add(x, y)
367{
368 var lsw = (x & 0xFFFF) + (y & 0xFFFF);
369 var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
370 return (msw << 16) | (lsw & 0xFFFF);
371}
372
373/*
374 * Bitwise rotate a 32-bit number to the left.
375 */
376function bit_rol(num, cnt)
377{
378 return (num << cnt) | (num >>> (32 - cnt));
379}