js MD5

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), ōpad = 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;  
}