/*

  * A JavaScript implementation of the RSA Data Security, Inc. MD5 Message

  * Digest Algorithm, as defined in RFC 1321.

  * Version 2.1 Copyright (C) Paul Johnston 1999 - 2002.

  * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet

  * Distributed under the BSD License

  * See http://pajhome.org.uk/crypt/md5 for more info.

  */

 

 /*

  * Configurable variables. You may need to tweak these to be compatible with

  * the server-side, but the defaults work in most cases.

  */

 var hexcase = 0;  /* hex output format. 0 - lowercase; 1 - uppercase        */

 var b64pad  = ""; /* base-64 pad character. "=" for strict RFC compliance   */

 var chrsz   = 8;  /* bits per input character. 8 - ASCII; 16 - Unicode      */

 

 /*

  * These are the functions you'll usually want to call

  * They take string arguments and return either hex or base-64 encoded strings

  */

 function hex_md5(s){ return binl2hex(core_md5(str2binl(s), s.length * chrsz));}

 function b64_md5(s){ return binl2b64(core_md5(str2binl(s), s.length * chrsz));}

 function str_md5(s){ return binl2str(core_md5(str2binl(s), s.length * chrsz));}

 function hex_hmac_md5(key, data) { return binl2hex(core_hmac_md5(key, data)); }

 function b64_hmac_md5(key, data) { return binl2b64(core_hmac_md5(key, data)); }

 function str_hmac_md5(key, data) { return binl2str(core_hmac_md5(key, data)); }

 

 /*

  * Perform a simple self-test to see if the VM is working

  */

 function md5_vm_test()

 {

   return hex_md5("abc") == "900150983cd24fb0d6963f7d28e17f72";

 }

 

 /*

  * Calculate the MD5 of an array of little-endian words, and a bit length

  */

 function core_md5(x, len)

 {

   /* append padding */

   x[len >> 5] |= 0x80 << ((len) % 32);

   x[(((len + 64) >>> 9) << 4) + 14] = len;

 

   var a =  1732584193;

   var b = -271733879;

   var c = -1732584194;

   var d =  271733878;

 

   for(var i = 0; i < x.length; i += 16)

   {

     var olda = a;

     var oldb = b;

     var oldc = c;

     var oldd = d;

 

     a = md5_ff(a, b, c, d, x[i+ 0], 7 , -680876936);

     d = md5_ff(d, a, b, c, x[i+ 1], 12, -389564586);

     c = md5_ff(c, d, a, b, x[i+ 2], 17,  606105819);

     b = md5_ff(b, c, d, a, x[i+ 3], 22, -1044525330);

     a = md5_ff(a, b, c, d, x[i+ 4], 7 , -176418897);

     d = md5_ff(d, a, b, c, x[i+ 5], 12,  1200080426);

     c = md5_ff(c, d, a, b, x[i+ 6], 17, -1473231341);

     b = md5_ff(b, c, d, a, x[i+ 7], 22, -45705983);

     a = md5_ff(a, b, c, d, x[i+ 8], 7 ,  1770035416);

     d = md5_ff(d, a, b, c, x[i+ 9], 12, -1958414417);

     c = md5_ff(c, d, a, b, x[i+10], 17, -42063);

     b = md5_ff(b, c, d, a, x[i+11], 22, -1990404162);

     a = md5_ff(a, b, c, d, x[i+12], 7 ,  1804603682);

     d = md5_ff(d, a, b, c, x[i+13], 12, -40341101);

     c = md5_ff(c, d, a, b, x[i+14], 17, -1502002290);

     b = md5_ff(b, c, d, a, x[i+15], 22,  1236535329);

 

     a = md5_gg(a, b, c, d, x[i+ 1], 5 , -165796510);

     d = md5_gg(d, a, b, c, x[i+ 6], 9 , -1069501632);

     c = md5_gg(c, d, a, b, x[i+11], 14,  643717713);

     b = md5_gg(b, c, d, a, x[i+ 0], 20, -373897302);

     a = md5_gg(a, b, c, d, x[i+ 5], 5 , -701558691);

     d = md5_gg(d, a, b, c, x[i+10], 9 ,  38016083);

     c = md5_gg(c, d, a, b, x[i+15], 14, -660478335);

     b = md5_gg(b, c, d, a, x[i+ 4], 20, -405537848);

     a = md5_gg(a, b, c, d, x[i+ 9], 5 ,  568446438);

     d = md5_gg(d, a, b, c, x[i+14], 9 , -1019803690);

     c = md5_gg(c, d, a, b, x[i+ 3], 14, -187363961);

     b = md5_gg(b, c, d, a, x[i+ 8], 20,  1163531501);

     a = md5_gg(a, b, c, d, x[i+13], 5 , -1444681467);

     d = md5_gg(d, a, b, c, x[i+ 2], 9 , -51403784);

     c = md5_gg(c, d, a, b, x[i+ 7], 14,  1735328473);

     b = md5_gg(b, c, d, a, x[i+12], 20, -1926607734);

 

     a = md5_hh(a, b, c, d, x[i+ 5], 4 , -378558);

     d = md5_hh(d, a, b, c, x[i+ 8], 11, -2022574463);

     c = md5_hh(c, d, a, b, x[i+11], 16,  1839030562);

     b = md5_hh(b, c, d, a, x[i+14], 23, -35309556);

     a = md5_hh(a, b, c, d, x[i+ 1], 4 , -1530992060);

     d = md5_hh(d, a, b, c, x[i+ 4], 11,  1272893353);

     c = md5_hh(c, d, a, b, x[i+ 7], 16, -155497632);

     b = md5_hh(b, c, d, a, x[i+10], 23, -1094730640);

     a = md5_hh(a, b, c, d, x[i+13], 4 ,  681279174);

     d = md5_hh(d, a, b, c, x[i+ 0], 11, -358537222);

     c = md5_hh(c, d, a, b, x[i+ 3], 16, -722521979);

     b = md5_hh(b, c, d, a, x[i+ 6], 23,  76029189);

     a = md5_hh(a, b, c, d, x[i+ 9], 4 , -640364487);

     d = md5_hh(d, a, b, c, x[i+12], 11, -421815835);

     c = md5_hh(c, d, a, b, x[i+15], 16,  530742520);

     b = md5_hh(b, c, d, a, x[i+ 2], 23, -995338651);

 

     a = md5_ii(a, b, c, d, x[i+ 0], 6 , -198630844);

     d = md5_ii(d, a, b, c, x[i+ 7], 10,  1126891415);

     c = md5_ii(c, d, a, b, x[i+14], 15, -1416354905);

     b = md5_ii(b, c, d, a, x[i+ 5], 21, -57434055);

     a = md5_ii(a, b, c, d, x[i+12], 6 ,  1700485571);

     d = md5_ii(d, a, b, c, x[i+ 3], 10, -1894986606);

     c = md5_ii(c, d, a, b, x[i+10], 15, -1051523);

     b = md5_ii(b, c, d, a, x[i+ 1], 21, -2054922799);

     a = md5_ii(a, b, c, d, x[i+ 8], 6 ,  1873313359);

     d = md5_ii(d, a, b, c, x[i+15], 10, -30611744);

     c = md5_ii(c, d, a, b, x[i+ 6], 15, -1560198380);

     b = md5_ii(b, c, d, a, x[i+13], 21,  1309151649);

     a = md5_ii(a, b, c, d, x[i+ 4], 6 , -145523070);

     d = md5_ii(d, a, b, c, x[i+11], 10, -1120210379);

     c = md5_ii(c, d, a, b, x[i+ 2], 15,  718787259);

     b = md5_ii(b, c, d, a, x[i+ 9], 21, -343485551);

 

     a = safe_add(a, olda);

     b = safe_add(b, oldb);

     c = safe_add(c, oldc);

     d = safe_add(d, oldd);

   }

   return Array(a, b, c, d);

 

 }

 

 /*

  * These functions implement the four basic operations the algorithm uses.

  */

 function md5_cmn(q, a, b, x, s, t)

 {

   return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s),b);

 }

 function md5_ff(a, b, c, d, x, s, t)

 {

   return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t);

 }

 function md5_gg(a, b, c, d, x, s, t)

 {

   return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t);

 }

 function md5_hh(a, b, c, d, x, s, t)

 {

   return md5_cmn(b ^ c ^ d, a, b, x, s, t);

 }

 function md5_ii(a, b, c, d, x, s, t)

 {

   return md5_cmn(c ^ (b | (~d)), a, b, x, s, t);

 }

 

 /*

  * Calculate the HMAC-MD5, of a key and some data

  */

 function core_hmac_md5(key, data)

 {

   var bkey = str2binl(key);

   if(bkey.length > 16) bkey = core_md5(bkey, key.length * chrsz);

 

   var ipad = Array(16), opad = Array(16);

   for(var i = 0; i < 16; i++)

   {

     ipad[i] = bkey[i] ^ 0x36363636;

     opad[i] = bkey[i] ^ 0x5C5C5C5C;

   }

 

   var hash = core_md5(ipad.concat(str2binl(data)), 512 + data.length * chrsz);

   return core_md5(opad.concat(hash), 512 + 128);

 }

 

 /*

  * Add integers, wrapping at 2^32. This uses 16-bit operations internally

  * to work around bugs in some JS interpreters.

  */

 function safe_add(x, y)

 {

   var lsw = (x & 0xFFFF) + (y & 0xFFFF);

   var msw = (x >> 16) + (y >> 16) + (lsw >> 16);

   return (msw << 16) | (lsw & 0xFFFF);

 }

 

 /*

  * Bitwise rotate a 32-bit number to the left.

  */

 function bit_rol(num, cnt)

 {

   return (num << cnt) | (num >>> (32 - cnt));

 }

 

 /*

  * Convert a string to an array of little-endian words

  * If chrsz is ASCII, characters >255 have their hi-byte silently ignored.

  */

 function str2binl(str)

 {

   var bin = Array();

   var mask = (1 << chrsz) - 1;

   for(var i = 0; i < str.length * chrsz; i += chrsz)

     bin[i>>5] |= (str.charCodeAt(i / chrsz) & mask) << (i%32);

   return bin;

 }

 

 /*

  * Convert an array of little-endian words to a string

  */

 function binl2str(bin)

 {

   var str = "";

   var mask = (1 << chrsz) - 1;

   for(var i = 0; i < bin.length * 32; i += chrsz)

     str += String.fromCharCode((bin[i>>5] >>> (i % 32)) & mask);

   return str;

 }

 

 /*

  * Convert an array of little-endian words to a hex string.

  */

 function binl2hex(binarray)

 {

   var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";

   var str = "";

   for(var i = 0; i < binarray.length * 4; i++)

   {

     str += hex_tab.charAt((binarray[i>>2] >> ((i%4)*8+4)) & 0xF) +

            hex_tab.charAt((binarray[i>>2] >> ((i%4)*8  )) & 0xF);

   }

   return str;

 }

 

 /*

  * Convert an array of little-endian words to a base-64 string

  */

 function binl2b64(binarray)

 {

   var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

   var str = "";

   for(var i = 0; i < binarray.length * 4; i += 3)

   {

     var triplet = (((binarray[i   >> 2] >> 8 * ( i   %4)) & 0xFF) << 16)

                 | (((binarray[i+1 >> 2] >> 8 * ((i+1)%4)) & 0xFF) << 8 )

                 |  ((binarray[i+2 >> 2] >> 8 * ((i+2)%4)) & 0xFF);

     for(var j = 0; j < 4; j++)

     {

       if(i * 8 + j * 6 > binarray.length * 32) str += b64pad;

       else str += tab.charAt((triplet >> 6*(3-j)) & 0x3F);

     }

   }

   return str;

 }