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), ��pad = 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;   
}