/*


 * 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


 */

// char(16)
function hex_md5(s){ return binl2hex(core_md5(str2binl(s), s.length * chrsz));}

//char(32)
function h32_md5(s){ return binl2hex32(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()


{

 // for the QuanZhou Web old user with  char(16) MD5 password  zhangdb 2007-06-25
 //  return hex_md5("abc") == "900150983cd24fb0d6963f7d28e17f72";
 
   return hex_md5("abc") == "3cd24fb0d6963f7d";


}





/*


 * 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 = "";
  var str1 = "";


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


  {


    str1 += hex_tab.charAt((binarray[i>>2] >> ((i%4)*8+4)) & 0xF) +


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


  }
  
 // change char(32) to char(16)
 // for the QuanZhou Web old user with char(16) MD5 password  zhangdb 2007-06-25
  for (var i=8 ; i< 24; i++ )
  {
  	str += str1.charAt(i);
  }
  
  return str;


}



function binl2hex32(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;


}