Added clearfix to .buttons class

[moodle.git] / lib / md5.js

/*\r
 * A JavaScript implementation of the RSA Data Security, Inc. MD5 Message\r
 * Digest Algorithm, as defined in RFC 1321.\r
 * Version 2.1 Copyright (C) Paul Johnston 1999 - 2002.\r
 * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet\r
 * Distributed under the BSD License\r
 * See http://pajhome.org.uk/crypt/md5 for more info.\r
 */\r
\r
/*\r
 * Configurable variables. You may need to tweak these to be compatible with\r
 * the server-side, but the defaults work in most cases.\r
 */\r
var hexcase = 0;  /* hex output format. 0 - lowercase; 1 - uppercase        */\r
var b64pad  = ""; /* base-64 pad character. "=" for strict RFC compliance   */\r
var chrsz   = 8;  /* bits per input character. 8 - ASCII; 16 - Unicode      */\r
\r
/*\r
 * These are the functions you'll usually want to call\r
 * They take string arguments and return either hex or base-64 encoded strings\r
 */\r
function hex_md5(s){ return binl2hex(core_md5(str2binl(s), s.length * chrsz));}\r
function b64_md5(s){ return binl2b64(core_md5(str2binl(s), s.length * chrsz));}\r
function str_md5(s){ return binl2str(core_md5(str2binl(s), s.length * chrsz));}\r
function hex_hmac_md5(key, data) { return binl2hex(core_hmac_md5(key, data)); }\r
function b64_hmac_md5(key, data) { return binl2b64(core_hmac_md5(key, data)); }\r
function str_hmac_md5(key, data) { return binl2str(core_hmac_md5(key, data)); }\r
\r
/*\r
 * Perform a simple self-test to see if the VM is working\r
 */\r
function md5_vm_test()\r
{\r
  return hex_md5("abc") == "900150983cd24fb0d6963f7d28e17f72";\r
}\r
\r
/*\r
 * Calculate the MD5 of an array of little-endian words, and a bit length\r
 */\r
function core_md5(x, len)\r
{\r
  /* append padding */\r
  x[len >> 5] |= 0x80 << ((len) % 32);\r
  x[(((len + 64) >>> 9) << 4) + 14] = len;\r
\r
  var a =  1732584193;\r
  var b = -271733879;\r
  var c = -1732584194;\r
  var d =  271733878;\r
\r
  for(var i = 0; i < x.length; i += 16)\r
  {\r
    var olda = a;\r
    var oldb = b;\r
    var oldc = c;\r
    var oldd = d;\r
\r
    a = md5_ff(a, b, c, d, x[i+ 0], 7 , -680876936);\r
    d = md5_ff(d, a, b, c, x[i+ 1], 12, -389564586);\r
    c = md5_ff(c, d, a, b, x[i+ 2], 17,  606105819);\r
    b = md5_ff(b, c, d, a, x[i+ 3], 22, -1044525330);\r
    a = md5_ff(a, b, c, d, x[i+ 4], 7 , -176418897);\r
    d = md5_ff(d, a, b, c, x[i+ 5], 12,  1200080426);\r
    c = md5_ff(c, d, a, b, x[i+ 6], 17, -1473231341);\r
    b = md5_ff(b, c, d, a, x[i+ 7], 22, -45705983);\r
    a = md5_ff(a, b, c, d, x[i+ 8], 7 ,  1770035416);\r
    d = md5_ff(d, a, b, c, x[i+ 9], 12, -1958414417);\r
    c = md5_ff(c, d, a, b, x[i+10], 17, -42063);\r
    b = md5_ff(b, c, d, a, x[i+11], 22, -1990404162);\r
    a = md5_ff(a, b, c, d, x[i+12], 7 ,  1804603682);\r
    d = md5_ff(d, a, b, c, x[i+13], 12, -40341101);\r
    c = md5_ff(c, d, a, b, x[i+14], 17, -1502002290);\r
    b = md5_ff(b, c, d, a, x[i+15], 22,  1236535329);\r
\r
    a = md5_gg(a, b, c, d, x[i+ 1], 5 , -165796510);\r
    d = md5_gg(d, a, b, c, x[i+ 6], 9 , -1069501632);\r
    c = md5_gg(c, d, a, b, x[i+11], 14,  643717713);\r
    b = md5_gg(b, c, d, a, x[i+ 0], 20, -373897302);\r
    a = md5_gg(a, b, c, d, x[i+ 5], 5 , -701558691);\r
    d = md5_gg(d, a, b, c, x[i+10], 9 ,  38016083);\r
    c = md5_gg(c, d, a, b, x[i+15], 14, -660478335);\r
    b = md5_gg(b, c, d, a, x[i+ 4], 20, -405537848);\r
    a = md5_gg(a, b, c, d, x[i+ 9], 5 ,  568446438);\r
    d = md5_gg(d, a, b, c, x[i+14], 9 , -1019803690);\r
    c = md5_gg(c, d, a, b, x[i+ 3], 14, -187363961);\r
    b = md5_gg(b, c, d, a, x[i+ 8], 20,  1163531501);\r
    a = md5_gg(a, b, c, d, x[i+13], 5 , -1444681467);\r
    d = md5_gg(d, a, b, c, x[i+ 2], 9 , -51403784);\r
    c = md5_gg(c, d, a, b, x[i+ 7], 14,  1735328473);\r
    b = md5_gg(b, c, d, a, x[i+12], 20, -1926607734);\r
\r
    a = md5_hh(a, b, c, d, x[i+ 5], 4 , -378558);\r
    d = md5_hh(d, a, b, c, x[i+ 8], 11, -2022574463);\r
    c = md5_hh(c, d, a, b, x[i+11], 16,  1839030562);\r
    b = md5_hh(b, c, d, a, x[i+14], 23, -35309556);\r
    a = md5_hh(a, b, c, d, x[i+ 1], 4 , -1530992060);\r
    d = md5_hh(d, a, b, c, x[i+ 4], 11,  1272893353);\r
    c = md5_hh(c, d, a, b, x[i+ 7], 16, -155497632);\r
    b = md5_hh(b, c, d, a, x[i+10], 23, -1094730640);\r
    a = md5_hh(a, b, c, d, x[i+13], 4 ,  681279174);\r
    d = md5_hh(d, a, b, c, x[i+ 0], 11, -358537222);\r
    c = md5_hh(c, d, a, b, x[i+ 3], 16, -722521979);\r
    b = md5_hh(b, c, d, a, x[i+ 6], 23,  76029189);\r
    a = md5_hh(a, b, c, d, x[i+ 9], 4 , -640364487);\r
    d = md5_hh(d, a, b, c, x[i+12], 11, -421815835);\r
    c = md5_hh(c, d, a, b, x[i+15], 16,  530742520);\r
    b = md5_hh(b, c, d, a, x[i+ 2], 23, -995338651);\r
\r
    a = md5_ii(a, b, c, d, x[i+ 0], 6 , -198630844);\r
    d = md5_ii(d, a, b, c, x[i+ 7], 10,  1126891415);\r
    c = md5_ii(c, d, a, b, x[i+14], 15, -1416354905);\r
    b = md5_ii(b, c, d, a, x[i+ 5], 21, -57434055);\r
    a = md5_ii(a, b, c, d, x[i+12], 6 ,  1700485571);\r
    d = md5_ii(d, a, b, c, x[i+ 3], 10, -1894986606);\r
    c = md5_ii(c, d, a, b, x[i+10], 15, -1051523);\r
    b = md5_ii(b, c, d, a, x[i+ 1], 21, -2054922799);\r
    a = md5_ii(a, b, c, d, x[i+ 8], 6 ,  1873313359);\r
    d = md5_ii(d, a, b, c, x[i+15], 10, -30611744);\r
    c = md5_ii(c, d, a, b, x[i+ 6], 15, -1560198380);\r
    b = md5_ii(b, c, d, a, x[i+13], 21,  1309151649);\r
    a = md5_ii(a, b, c, d, x[i+ 4], 6 , -145523070);\r
    d = md5_ii(d, a, b, c, x[i+11], 10, -1120210379);\r
    c = md5_ii(c, d, a, b, x[i+ 2], 15,  718787259);\r
    b = md5_ii(b, c, d, a, x[i+ 9], 21, -343485551);\r
\r
    a = safe_add(a, olda);\r
    b = safe_add(b, oldb);\r
    c = safe_add(c, oldc);\r
    d = safe_add(d, oldd);\r
  }\r
  return Array(a, b, c, d);\r
\r
}\r
\r
/*\r
 * These functions implement the four basic operations the algorithm uses.\r
 */\r
function md5_cmn(q, a, b, x, s, t)\r
{\r
  return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s),b);\r
}\r
function md5_ff(a, b, c, d, x, s, t)\r
{\r
  return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t);\r
}\r
function md5_gg(a, b, c, d, x, s, t)\r
{\r
  return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t);\r
}\r
function md5_hh(a, b, c, d, x, s, t)\r
{\r
  return md5_cmn(b ^ c ^ d, a, b, x, s, t);\r
}\r
function md5_ii(a, b, c, d, x, s, t)\r
{\r
  return md5_cmn(c ^ (b | (~d)), a, b, x, s, t);\r
}\r
\r
/*\r
 * Calculate the HMAC-MD5, of a key and some data\r
 */\r
function core_hmac_md5(key, data)\r
{\r
  var bkey = str2binl(key);\r
  if(bkey.length > 16) bkey = core_md5(bkey, key.length * chrsz);\r
\r
  var ipad = Array(16), opad = Array(16);\r
  for(var i = 0; i < 16; i++)\r
  {\r
    ipad[i] = bkey[i] ^ 0x36363636;\r
    opad[i] = bkey[i] ^ 0x5C5C5C5C;\r
  }\r
\r
  var hash = core_md5(ipad.concat(str2binl(data)), 512 + data.length * chrsz);\r
  return core_md5(opad.concat(hash), 512 + 128);\r
}\r
\r
/*\r
 * Add integers, wrapping at 2^32. This uses 16-bit operations internally\r
 * to work around bugs in some JS interpreters.\r
 */\r
function safe_add(x, y)\r
{\r
  var lsw = (x & 0xFFFF) + (y & 0xFFFF);\r
  var msw = (x >> 16) + (y >> 16) + (lsw >> 16);\r
  return (msw << 16) | (lsw & 0xFFFF);\r
}\r
\r
/*\r
 * Bitwise rotate a 32-bit number to the left.\r
 */\r
function bit_rol(num, cnt)\r
{\r
  return (num << cnt) | (num >>> (32 - cnt));\r
}\r
\r
/*\r
 * Convert a string to an array of little-endian words\r
 * If chrsz is ASCII, characters >255 have their hi-byte silently ignored.\r
 */\r
function str2binl(str)\r
{\r
  var bin = Array();\r
  var mask = (1 << chrsz) - 1;\r
  for(var i = 0; i < str.length * chrsz; i += chrsz)\r
    bin[i>>5] |= (str.charCodeAt(i / chrsz) & mask) << (i%32);\r
  return bin;\r
}\r
\r
/*\r
 * Convert an array of little-endian words to a string\r
 */\r
function binl2str(bin)\r
{\r
  var str = "";\r
  var mask = (1 << chrsz) - 1;\r
  for(var i = 0; i < bin.length * 32; i += chrsz)\r
    str += String.fromCharCode((bin[i>>5] >>> (i % 32)) & mask);\r
  return str;\r
}\r
\r
/*\r
 * Convert an array of little-endian words to a hex string.\r
 */\r
function binl2hex(binarray)\r
{\r
  var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";\r
  var str = "";\r
  for(var i = 0; i < binarray.length * 4; i++)\r
  {\r
    str += hex_tab.charAt((binarray[i>>2] >> ((i%4)*8+4)) & 0xF) +\r
           hex_tab.charAt((binarray[i>>2] >> ((i%4)*8  )) & 0xF);\r
  }\r
  return str;\r
}\r
\r
/*\r
 * Convert an array of little-endian words to a base-64 string\r
 */\r
function binl2b64(binarray)\r
{\r
  var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";\r
  var str = "";\r
  for(var i = 0; i < binarray.length * 4; i += 3)\r
  {\r
    var triplet = (((binarray[i   >> 2] >> 8 * ( i   %4)) & 0xFF) << 16)\r
                | (((binarray[i+1 >> 2] >> 8 * ((i+1)%4)) & 0xFF) << 8 )\r
                |  ((binarray[i+2 >> 2] >> 8 * ((i+2)%4)) & 0xFF);\r
    for(var j = 0; j < 4; j++)\r
    {\r
      if(i * 8 + j * 6 > binarray.length * 32) str += b64pad;\r
      else str += tab.charAt((triplet >> 6*(3-j)) & 0x3F);\r
    }\r
  }\r
  return str;\r
}\r