michael@0: /*
michael@0:  * A JavaScript implementation of the RSA Data Security, Inc. MD5 Message
michael@0:  * Digest Algorithm, as defined in RFC 1321.
michael@0:  * Version 2.1 Copyright (C) Paul Johnston 1999 - 2002.
michael@0:  * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
michael@0:  * Distributed under the BSD License
michael@0:  * See http://pajhome.org.uk/crypt/md5 for more info.
michael@0:  */
michael@0: 
michael@0: /*
michael@0:  * Configurable variables. You may need to tweak these to be compatible with
michael@0:  * the server-side, but the defaults work in most cases.
michael@0:  */
michael@0: var hexcase = 0;  /* hex output format. 0 - lowercase; 1 - uppercase        */
michael@0: var b64pad  = ""; /* base-64 pad character. "=" for strict RFC compliance   */
michael@0: var chrsz   = 8;  /* bits per input character. 8 - ASCII; 16 - Unicode      */
michael@0: 
michael@0: /*
michael@0:  * These are the functions you'll usually want to call
michael@0:  * They take string arguments and return either hex or base-64 encoded strings
michael@0:  */
michael@0: function hexmd5(s){ return binl2hex(coremd5(str2binl(s), s.length * chrsz));}
michael@0: function b64md5(s){ return binl2b64(coremd5(str2binl(s), s.length * chrsz));}
michael@0: function strmd5(s){ return binl2str(coremd5(str2binl(s), s.length * chrsz));}
michael@0: function hexhmacmd5(key, data) { return binl2hex(corehmacmd5(key, data)); }
michael@0: function b64hmacmd5(key, data) { return binl2b64(corehmacmd5(key, data)); }
michael@0: function strhmacmd5(key, data) { return binl2str(corehmacmd5(key, data)); }
michael@0: 
michael@0: /*
michael@0:  * Perform a simple self-test to see if the VM is working
michael@0:  */
michael@0: function md5vmtest()
michael@0: {
michael@0:   return hexmd5("abc") == "900150983cd24fb0d6963f7d28e17f72";
michael@0: }
michael@0: 
michael@0: /*
michael@0:  * Calculate the MD5 of an array of little-endian words, and a bit length
michael@0:  */
michael@0: function coremd5(x, len)
michael@0: {
michael@0:   /* append padding */
michael@0:   x[len >> 5] |= 0x80 << ((len) % 32);
michael@0:   x[(((len + 64) >>> 9) << 4) + 14] = len;
michael@0: 
michael@0:   var a =  1732584193;
michael@0:   var b = -271733879;
michael@0:   var c = -1732584194;
michael@0:   var d =  271733878;
michael@0: 
michael@0:   for(var i = 0; i < x.length; i += 16)
michael@0:   {
michael@0:     var olda = a;
michael@0:     var oldb = b;
michael@0:     var oldc = c;
michael@0:     var oldd = d;
michael@0: 
michael@0:     a = md5ff(a, b, c, d, x[i+ 0], 7 , -680876936);
michael@0:     d = md5ff(d, a, b, c, x[i+ 1], 12, -389564586);
michael@0:     c = md5ff(c, d, a, b, x[i+ 2], 17,  606105819);
michael@0:     b = md5ff(b, c, d, a, x[i+ 3], 22, -1044525330);
michael@0:     a = md5ff(a, b, c, d, x[i+ 4], 7 , -176418897);
michael@0:     d = md5ff(d, a, b, c, x[i+ 5], 12,  1200080426);
michael@0:     c = md5ff(c, d, a, b, x[i+ 6], 17, -1473231341);
michael@0:     b = md5ff(b, c, d, a, x[i+ 7], 22, -45705983);
michael@0:     a = md5ff(a, b, c, d, x[i+ 8], 7 ,  1770035416);
michael@0:     d = md5ff(d, a, b, c, x[i+ 9], 12, -1958414417);
michael@0:     c = md5ff(c, d, a, b, x[i+10], 17, -42063);
michael@0:     b = md5ff(b, c, d, a, x[i+11], 22, -1990404162);
michael@0:     a = md5ff(a, b, c, d, x[i+12], 7 ,  1804603682);
michael@0:     d = md5ff(d, a, b, c, x[i+13], 12, -40341101);
michael@0:     c = md5ff(c, d, a, b, x[i+14], 17, -1502002290);
michael@0:     b = md5ff(b, c, d, a, x[i+15], 22,  1236535329);
michael@0: 
michael@0:     a = md5gg(a, b, c, d, x[i+ 1], 5 , -165796510);
michael@0:     d = md5gg(d, a, b, c, x[i+ 6], 9 , -1069501632);
michael@0:     c = md5gg(c, d, a, b, x[i+11], 14,  643717713);
michael@0:     b = md5gg(b, c, d, a, x[i+ 0], 20, -373897302);
michael@0:     a = md5gg(a, b, c, d, x[i+ 5], 5 , -701558691);
michael@0:     d = md5gg(d, a, b, c, x[i+10], 9 ,  38016083);
michael@0:     c = md5gg(c, d, a, b, x[i+15], 14, -660478335);
michael@0:     b = md5gg(b, c, d, a, x[i+ 4], 20, -405537848);
michael@0:     a = md5gg(a, b, c, d, x[i+ 9], 5 ,  568446438);
michael@0:     d = md5gg(d, a, b, c, x[i+14], 9 , -1019803690);
michael@0:     c = md5gg(c, d, a, b, x[i+ 3], 14, -187363961);
michael@0:     b = md5gg(b, c, d, a, x[i+ 8], 20,  1163531501);
michael@0:     a = md5gg(a, b, c, d, x[i+13], 5 , -1444681467);
michael@0:     d = md5gg(d, a, b, c, x[i+ 2], 9 , -51403784);
michael@0:     c = md5gg(c, d, a, b, x[i+ 7], 14,  1735328473);
michael@0:     b = md5gg(b, c, d, a, x[i+12], 20, -1926607734);
michael@0: 
michael@0:     a = md5hh(a, b, c, d, x[i+ 5], 4 , -378558);
michael@0:     d = md5hh(d, a, b, c, x[i+ 8], 11, -2022574463);
michael@0:     c = md5hh(c, d, a, b, x[i+11], 16,  1839030562);
michael@0:     b = md5hh(b, c, d, a, x[i+14], 23, -35309556);
michael@0:     a = md5hh(a, b, c, d, x[i+ 1], 4 , -1530992060);
michael@0:     d = md5hh(d, a, b, c, x[i+ 4], 11,  1272893353);
michael@0:     c = md5hh(c, d, a, b, x[i+ 7], 16, -155497632);
michael@0:     b = md5hh(b, c, d, a, x[i+10], 23, -1094730640);
michael@0:     a = md5hh(a, b, c, d, x[i+13], 4 ,  681279174);
michael@0:     d = md5hh(d, a, b, c, x[i+ 0], 11, -358537222);
michael@0:     c = md5hh(c, d, a, b, x[i+ 3], 16, -722521979);
michael@0:     b = md5hh(b, c, d, a, x[i+ 6], 23,  76029189);
michael@0:     a = md5hh(a, b, c, d, x[i+ 9], 4 , -640364487);
michael@0:     d = md5hh(d, a, b, c, x[i+12], 11, -421815835);
michael@0:     c = md5hh(c, d, a, b, x[i+15], 16,  530742520);
michael@0:     b = md5hh(b, c, d, a, x[i+ 2], 23, -995338651);
michael@0: 
michael@0:     a = md5ii(a, b, c, d, x[i+ 0], 6 , -198630844);
michael@0:     d = md5ii(d, a, b, c, x[i+ 7], 10,  1126891415);
michael@0:     c = md5ii(c, d, a, b, x[i+14], 15, -1416354905);
michael@0:     b = md5ii(b, c, d, a, x[i+ 5], 21, -57434055);
michael@0:     a = md5ii(a, b, c, d, x[i+12], 6 ,  1700485571);
michael@0:     d = md5ii(d, a, b, c, x[i+ 3], 10, -1894986606);
michael@0:     c = md5ii(c, d, a, b, x[i+10], 15, -1051523);
michael@0:     b = md5ii(b, c, d, a, x[i+ 1], 21, -2054922799);
michael@0:     a = md5ii(a, b, c, d, x[i+ 8], 6 ,  1873313359);
michael@0:     d = md5ii(d, a, b, c, x[i+15], 10, -30611744);
michael@0:     c = md5ii(c, d, a, b, x[i+ 6], 15, -1560198380);
michael@0:     b = md5ii(b, c, d, a, x[i+13], 21,  1309151649);
michael@0:     a = md5ii(a, b, c, d, x[i+ 4], 6 , -145523070);
michael@0:     d = md5ii(d, a, b, c, x[i+11], 10, -1120210379);
michael@0:     c = md5ii(c, d, a, b, x[i+ 2], 15,  718787259);
michael@0:     b = md5ii(b, c, d, a, x[i+ 9], 21, -343485551);
michael@0: 
michael@0:     a = safeadd(a, olda);
michael@0:     b = safeadd(b, oldb);
michael@0:     c = safeadd(c, oldc);
michael@0:     d = safeadd(d, oldd);
michael@0:   }
michael@0:   return Array(a, b, c, d);
michael@0: 
michael@0: }
michael@0: 
michael@0: /*
michael@0:  * These functions implement the four basic operations the algorithm uses.
michael@0:  */
michael@0: function md5cmn(q, a, b, x, s, t)
michael@0: {
michael@0:   return safeadd(bitrol(safeadd(safeadd(a, q), safeadd(x, t)), s),b);
michael@0: }
michael@0: function md5ff(a, b, c, d, x, s, t)
michael@0: {
michael@0:   return md5cmn((b & c) | ((~b) & d), a, b, x, s, t);
michael@0: }
michael@0: function md5gg(a, b, c, d, x, s, t)
michael@0: {
michael@0:   return md5cmn((b & d) | (c & (~d)), a, b, x, s, t);
michael@0: }
michael@0: function md5hh(a, b, c, d, x, s, t)
michael@0: {
michael@0:   return md5cmn(b ^ c ^ d, a, b, x, s, t);
michael@0: }
michael@0: function md5ii(a, b, c, d, x, s, t)
michael@0: {
michael@0:   return md5cmn(c ^ (b | (~d)), a, b, x, s, t);
michael@0: }
michael@0: 
michael@0: /*
michael@0:  * Calculate the HMAC-MD5, of a key and some data
michael@0:  */
michael@0: function corehmacmd5(key, data)
michael@0: {
michael@0:   var bkey = str2binl(key);
michael@0:   if(bkey.length > 16) bkey = coremd5(bkey, key.length * chrsz);
michael@0: 
michael@0:   var ipad = Array(16), opad = Array(16);
michael@0:   for(var i = 0; i < 16; i++)
michael@0:   {
michael@0:     ipad[i] = bkey[i] ^ 0x36363636;
michael@0:     opad[i] = bkey[i] ^ 0x5C5C5C5C;
michael@0:   }
michael@0: 
michael@0:   var hash = coremd5(ipad.concat(str2binl(data)), 512 + data.length * chrsz);
michael@0:   return coremd5(opad.concat(hash), 512 + 128);
michael@0: }
michael@0: 
michael@0: /*
michael@0:  * Add integers, wrapping at 2^32. This uses 16-bit operations internally
michael@0:  * to work around bugs in some JS interpreters.
michael@0:  */
michael@0: function safeadd(x, y)
michael@0: {
michael@0:   var lsw = (x & 0xFFFF) + (y & 0xFFFF);
michael@0:   var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
michael@0:   return (msw << 16) | (lsw & 0xFFFF);
michael@0: }
michael@0: 
michael@0: /*
michael@0:  * Bitwise rotate a 32-bit number to the left.
michael@0:  */
michael@0: function bitrol(num, cnt)
michael@0: {
michael@0:   return (num << cnt) | (num >>> (32 - cnt));
michael@0: }
michael@0: 
michael@0: /*
michael@0:  * Convert a string to an array of little-endian words
michael@0:  * If chrsz is ASCII, characters >255 have their hi-byte silently ignored.
michael@0:  */
michael@0: function str2binl(str)
michael@0: {
michael@0:   var bin = Array();
michael@0:   var mask = (1 << chrsz) - 1;
michael@0:   for(var i = 0; i < str.length * chrsz; i += chrsz)
michael@0:     bin[i>>5] |= (str.charCodeAt(i / chrsz) & mask) << (i%32);
michael@0:   return bin;
michael@0: }
michael@0: 
michael@0: /*
michael@0:  * Convert an array of little-endian words to a string
michael@0:  */
michael@0: function binl2str(bin)
michael@0: {
michael@0:   var str = "";
michael@0:   var mask = (1 << chrsz) - 1;
michael@0:   for(var i = 0; i < bin.length * 32; i += chrsz)
michael@0:     str += String.fromCharCode((bin[i>>5] >>> (i % 32)) & mask);
michael@0:   return str;
michael@0: }
michael@0: 
michael@0: /*
michael@0:  * Convert an array of little-endian words to a hex string.
michael@0:  */
michael@0: function binl2hex(binarray)
michael@0: {
michael@0:   var hextab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
michael@0:   var str = "";
michael@0:   for(var i = 0; i < binarray.length * 4; i++)
michael@0:   {
michael@0:     str += hextab.charAt((binarray[i>>2] >> ((i%4)*8+4)) & 0xF) +
michael@0:            hextab.charAt((binarray[i>>2] >> ((i%4)*8  )) & 0xF);
michael@0:   }
michael@0:   return str;
michael@0: }
michael@0: 
michael@0: /*
michael@0:  * Convert an array of little-endian words to a base-64 string
michael@0:  */
michael@0: function binl2b64(binarray)
michael@0: {
michael@0:   var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
michael@0:   var str = "";
michael@0:   for(var i = 0; i < binarray.length * 4; i += 3)
michael@0:   {
michael@0:     var triplet = (((binarray[i   >> 2] >> 8 * ( i   %4)) & 0xFF) << 16)
michael@0:                 | (((binarray[i+1 >> 2] >> 8 * ((i+1)%4)) & 0xFF) << 8 )
michael@0:                 |  ((binarray[i+2 >> 2] >> 8 * ((i+2)%4)) & 0xFF);
michael@0:     for(var j = 0; j < 4; j++)
michael@0:     {
michael@0:       if(i * 8 + j * 6 > binarray.length * 32) str += b64pad;
michael@0:       else str += tab.charAt((triplet >> 6*(3-j)) & 0x3F);
michael@0:     }
michael@0:   }
michael@0:   return str;
michael@0: }