/* 
 * MD5 Construction 
 */
 
var hexcase = 0;  
var b64pad  = ""; 
var chrsz   = 8; 

function 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)); }

function md5_vm_test()
{
  return hex_md5("abc") == "900150983cd24fb0d6963f7d28e17f72";
}

function core_md5(x, len)
{
	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);

}

/*
 * MD5 Toolkits
 */
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);
}

/* 
 * MD5 Implementor
 */
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);
}

/*
 * Bitflipper
 */
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;
}