emergency release 2.2dev
[moodle.git] / lib / md5.js
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PS
1/*
2 * A JavaScript implementation of the RSA Data Security, Inc. MD5 Message
3 * Digest Algorithm, as defined in RFC 1321.
4 * Version 2.1 Copyright (C) Paul Johnston 1999 - 2002.
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 */
16var chrsz = 8; /* bits per input character. 8 - ASCII; 16 - Unicode */
17
18/*
19 * These are the functions you'll usually want to call
20 * They take string arguments and return either hex or base-64 encoded strings
21 */
22function hex_md5(s){ return binl2hex(core_md5(str2binl(s), s.length * chrsz));}
23function b64_md5(s){ return binl2b64(core_md5(str2binl(s), s.length * chrsz));}
24function str_md5(s){ return binl2str(core_md5(str2binl(s), s.length * chrsz));}
25function hex_hmac_md5(key, data) { return binl2hex(core_hmac_md5(key, data)); }
26function b64_hmac_md5(key, data) { return binl2b64(core_hmac_md5(key, data)); }
27function str_hmac_md5(key, data) { return binl2str(core_hmac_md5(key, data)); }
28
29/*
30 * Perform a simple self-test to see if the VM is working
31 */
32function md5_vm_test()
33{
34 return hex_md5("abc") == "900150983cd24fb0d6963f7d28e17f72";
35}
36
37/*
38 * Calculate the MD5 of an array of little-endian words, and a bit length
39 */
40function core_md5(x, len)
41{
42 /* append padding */
43 x[len >> 5] |= 0x80 << ((len) % 32);
44 x[(((len + 64) >>> 9) << 4) + 14] = len;
45
46 var a = 1732584193;
47 var b = -271733879;
48 var c = -1732584194;
49 var d = 271733878;
50
51 for(var i = 0; i < x.length; i += 16)
52 {
53 var olda = a;
54 var oldb = b;
55 var oldc = c;
56 var oldd = d;
57
58 a = md5_ff(a, b, c, d, x[i+ 0], 7 , -680876936);
59 d = md5_ff(d, a, b, c, x[i+ 1], 12, -389564586);
60 c = md5_ff(c, d, a, b, x[i+ 2], 17, 606105819);
61 b = md5_ff(b, c, d, a, x[i+ 3], 22, -1044525330);
62 a = md5_ff(a, b, c, d, x[i+ 4], 7 , -176418897);
63 d = md5_ff(d, a, b, c, x[i+ 5], 12, 1200080426);
64 c = md5_ff(c, d, a, b, x[i+ 6], 17, -1473231341);
65 b = md5_ff(b, c, d, a, x[i+ 7], 22, -45705983);
66 a = md5_ff(a, b, c, d, x[i+ 8], 7 , 1770035416);
67 d = md5_ff(d, a, b, c, x[i+ 9], 12, -1958414417);
68 c = md5_ff(c, d, a, b, x[i+10], 17, -42063);
69 b = md5_ff(b, c, d, a, x[i+11], 22, -1990404162);
70 a = md5_ff(a, b, c, d, x[i+12], 7 , 1804603682);
71 d = md5_ff(d, a, b, c, x[i+13], 12, -40341101);
72 c = md5_ff(c, d, a, b, x[i+14], 17, -1502002290);
73 b = md5_ff(b, c, d, a, x[i+15], 22, 1236535329);
74
75 a = md5_gg(a, b, c, d, x[i+ 1], 5 , -165796510);
76 d = md5_gg(d, a, b, c, x[i+ 6], 9 , -1069501632);
77 c = md5_gg(c, d, a, b, x[i+11], 14, 643717713);
78 b = md5_gg(b, c, d, a, x[i+ 0], 20, -373897302);
79 a = md5_gg(a, b, c, d, x[i+ 5], 5 , -701558691);
80 d = md5_gg(d, a, b, c, x[i+10], 9 , 38016083);
81 c = md5_gg(c, d, a, b, x[i+15], 14, -660478335);
82 b = md5_gg(b, c, d, a, x[i+ 4], 20, -405537848);
83 a = md5_gg(a, b, c, d, x[i+ 9], 5 , 568446438);
84 d = md5_gg(d, a, b, c, x[i+14], 9 , -1019803690);
85 c = md5_gg(c, d, a, b, x[i+ 3], 14, -187363961);
86 b = md5_gg(b, c, d, a, x[i+ 8], 20, 1163531501);
87 a = md5_gg(a, b, c, d, x[i+13], 5 , -1444681467);
88 d = md5_gg(d, a, b, c, x[i+ 2], 9 , -51403784);
89 c = md5_gg(c, d, a, b, x[i+ 7], 14, 1735328473);
90 b = md5_gg(b, c, d, a, x[i+12], 20, -1926607734);
91
92 a = md5_hh(a, b, c, d, x[i+ 5], 4 , -378558);
93 d = md5_hh(d, a, b, c, x[i+ 8], 11, -2022574463);
94 c = md5_hh(c, d, a, b, x[i+11], 16, 1839030562);
95 b = md5_hh(b, c, d, a, x[i+14], 23, -35309556);
96 a = md5_hh(a, b, c, d, x[i+ 1], 4 , -1530992060);
97 d = md5_hh(d, a, b, c, x[i+ 4], 11, 1272893353);
98 c = md5_hh(c, d, a, b, x[i+ 7], 16, -155497632);
99 b = md5_hh(b, c, d, a, x[i+10], 23, -1094730640);
100 a = md5_hh(a, b, c, d, x[i+13], 4 , 681279174);
101 d = md5_hh(d, a, b, c, x[i+ 0], 11, -358537222);
102 c = md5_hh(c, d, a, b, x[i+ 3], 16, -722521979);
103 b = md5_hh(b, c, d, a, x[i+ 6], 23, 76029189);
104 a = md5_hh(a, b, c, d, x[i+ 9], 4 , -640364487);
105 d = md5_hh(d, a, b, c, x[i+12], 11, -421815835);
106 c = md5_hh(c, d, a, b, x[i+15], 16, 530742520);
107 b = md5_hh(b, c, d, a, x[i+ 2], 23, -995338651);
108
109 a = md5_ii(a, b, c, d, x[i+ 0], 6 , -198630844);
110 d = md5_ii(d, a, b, c, x[i+ 7], 10, 1126891415);
111 c = md5_ii(c, d, a, b, x[i+14], 15, -1416354905);
112 b = md5_ii(b, c, d, a, x[i+ 5], 21, -57434055);
113 a = md5_ii(a, b, c, d, x[i+12], 6 , 1700485571);
114 d = md5_ii(d, a, b, c, x[i+ 3], 10, -1894986606);
115 c = md5_ii(c, d, a, b, x[i+10], 15, -1051523);
116 b = md5_ii(b, c, d, a, x[i+ 1], 21, -2054922799);
117 a = md5_ii(a, b, c, d, x[i+ 8], 6 , 1873313359);
118 d = md5_ii(d, a, b, c, x[i+15], 10, -30611744);
119 c = md5_ii(c, d, a, b, x[i+ 6], 15, -1560198380);
120 b = md5_ii(b, c, d, a, x[i+13], 21, 1309151649);
121 a = md5_ii(a, b, c, d, x[i+ 4], 6 , -145523070);
122 d = md5_ii(d, a, b, c, x[i+11], 10, -1120210379);
123 c = md5_ii(c, d, a, b, x[i+ 2], 15, 718787259);
124 b = md5_ii(b, c, d, a, x[i+ 9], 21, -343485551);
125
126 a = safe_add(a, olda);
127 b = safe_add(b, oldb);
128 c = safe_add(c, oldc);
129 d = safe_add(d, oldd);
130 }
131 return Array(a, b, c, d);
132
133}
134
135/*
136 * These functions implement the four basic operations the algorithm uses.
137 */
138function md5_cmn(q, a, b, x, s, t)
139{
140 return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s),b);
141}
142function md5_ff(a, b, c, d, x, s, t)
143{
144 return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t);
145}
146function md5_gg(a, b, c, d, x, s, t)
147{
148 return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t);
149}
150function md5_hh(a, b, c, d, x, s, t)
151{
152 return md5_cmn(b ^ c ^ d, a, b, x, s, t);
153}
154function md5_ii(a, b, c, d, x, s, t)
155{
156 return md5_cmn(c ^ (b | (~d)), a, b, x, s, t);
157}
158
159/*
160 * Calculate the HMAC-MD5, of a key and some data
161 */
162function core_hmac_md5(key, data)
163{
164 var bkey = str2binl(key);
165 if(bkey.length > 16) bkey = core_md5(bkey, key.length * chrsz);
166
167 var ipad = Array(16), opad = Array(16);
168 for(var i = 0; i < 16; i++)
169 {
170 ipad[i] = bkey[i] ^ 0x36363636;
171 opad[i] = bkey[i] ^ 0x5C5C5C5C;
172 }
173
174 var hash = core_md5(ipad.concat(str2binl(data)), 512 + data.length * chrsz);
175 return core_md5(opad.concat(hash), 512 + 128);
176}
177
178/*
179 * Add integers, wrapping at 2^32. This uses 16-bit operations internally
180 * to work around bugs in some JS interpreters.
181 */
182function safe_add(x, y)
183{
184 var lsw = (x & 0xFFFF) + (y & 0xFFFF);
185 var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
186 return (msw << 16) | (lsw & 0xFFFF);
187}
188
189/*
190 * Bitwise rotate a 32-bit number to the left.
191 */
192function bit_rol(num, cnt)
193{
194 return (num << cnt) | (num >>> (32 - cnt));
195}
196
197/*
198 * Convert a string to an array of little-endian words
199 * If chrsz is ASCII, characters >255 have their hi-byte silently ignored.
200 */
201function str2binl(str)
202{
203 var bin = Array();
204 var mask = (1 << chrsz) - 1;
205 for(var i = 0; i < str.length * chrsz; i += chrsz)
206 bin[i>>5] |= (str.charCodeAt(i / chrsz) & mask) << (i%32);
207 return bin;
208}
209
210/*
211 * Convert an array of little-endian words to a string
212 */
213function binl2str(bin)
214{
215 var str = "";
216 var mask = (1 << chrsz) - 1;
217 for(var i = 0; i < bin.length * 32; i += chrsz)
218 str += String.fromCharCode((bin[i>>5] >>> (i % 32)) & mask);
219 return str;
220}
221
222/*
223 * Convert an array of little-endian words to a hex string.
224 */
225function binl2hex(binarray)
226{
227 var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
228 var str = "";
229 for(var i = 0; i < binarray.length * 4; i++)
230 {
231 str += hex_tab.charAt((binarray[i>>2] >> ((i%4)*8+4)) & 0xF) +
232 hex_tab.charAt((binarray[i>>2] >> ((i%4)*8 )) & 0xF);
233 }
234 return str;
235}
236
237/*
238 * Convert an array of little-endian words to a base-64 string
239 */
240function binl2b64(binarray)
241{
242 var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
243 var str = "";
244 for(var i = 0; i < binarray.length * 4; i += 3)
245 {
246 var triplet = (((binarray[i >> 2] >> 8 * ( i %4)) & 0xFF) << 16)
247 | (((binarray[i+1 >> 2] >> 8 * ((i+1)%4)) & 0xFF) << 8 )
248 | ((binarray[i+2 >> 2] >> 8 * ((i+2)%4)) & 0xFF);
249 for(var j = 0; j < 4; j++)
250 {
251 if(i * 8 + j * 6 > binarray.length * 32) str += b64pad;
252 else str += tab.charAt((triplet >> 6*(3-j)) & 0x3F);
253 }
254 }
255 return str;
256}