/********
* cvhMD5 - The MD5 Message Digest Algorithm in JavasScript
* Distributed under the BSD License
* Based on Paul Johnston's JavaScript MD5 2.1 (c) 1999 - 2002 Paul Johnston
* Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
* See http://pajhome.org.uk/crypt/md5
* Object version (c) 2008 Chris VandenHeuvel
* hexcaseupper = set to false for lowercase output
* b64pad = set to "=" for strict RFC compliance
* bitsperchar = 8 for ASCII, 16 for Unicode
********/
var cvhMD5 = function(hexcaseupper, b64pad, bitsperchar) {
	var that = {};
	hexcaseupper = hexcaseupper == undefined ? false : hexcaseupper;
	b64pad = b64pad == undefined ? "" : b64pad;
	bitsperchar = bitsperchar == undefined ? 8 : bitsperchar;
	/* public functions */
	that.hex_md5 = function(s) { return binl2hex(core_md5(str2binl(s), s.length * bitsperchar));}
	that.b64_md5 = function(s) { return binl2b64(core_md5(str2binl(s), s.length * bitsperchar));}
	that.str_md5 = function(s) { return binl2str(core_md5(str2binl(s), s.length * bitsperchar));}
	that.hex_hmac_md5 = function(key, data) { return binl2hex(core_hmac_md5(key, data)); }
	that.b64_hmac_md5 = function(key, data) { return binl2b64(core_hmac_md5(key, data)); }
	that.str_hmac_md5 = function(key, data) { return binl2str(core_hmac_md5(key, data)); }
	/* private functions */
	var md5_vm_test = function() {
	  return that.hex_md5("abc") == "900150983cd24fb0d6963f7d28e17f72";
	}
	var safe_add = function(x, y) {
  	var lsw = (x & 0xFFFF) + (y & 0xFFFF);
	  var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
  	return (msw << 16) | (lsw & 0xFFFF);
	}
	var bit_rol = function(num, cnt) {
	  return (num << cnt) | (num >>> (32 - cnt));
	}
	var str2binl = function(str) {
	  var bin = Array();
  	var mask = (1 << bitsperchar) - 1;
	  for (var i = 0; i < str.length * bitsperchar; i += bitsperchar) {
  	  bin[i>>5] |= (str.charCodeAt(i / bitsperchar) & mask) << (i%32);
		}
	  return bin;
	}
	var binl2str = function(bin) {
	  var str = "";
  	var mask = (1 << bitsperchar) - 1;
	  for (var i = 0; i < bin.length * 32; i += bitsperchar) {
  	  str += String.fromCharCode((bin[i>>5] >>> (i % 32)) & mask);
		}
	  return str;
	}
	var binl2hex = function(binarray) {
	  var hex_tab = hexcaseupper ? "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;
	}
	var binl2b64 = function(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;
	}
	var md5_cmn = function(q, a, b, x, s, t) {
	  return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s),b);
	}
	var md5_ff = function(a, b, c, d, x, s, t) {
	  return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t);
	}
	var md5_gg = function(a, b, c, d, x, s, t) {
	  return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t);
	}
	var md5_hh = function(a, b, c, d, x, s, t) {
	  return md5_cmn(b ^ c ^ d, a, b, x, s, t);
	}
	var md5_ii = function(a, b, c, d, x, s, t) {
	  return md5_cmn(c ^ (b | (~d)), a, b, x, s, t);
	}
	var core_md5 = function(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);
	}
	var core_hmac_md5 = function(key, data) {
	  var bkey = str2binl(key);
  	if(bkey.length > 16) bkey = core_md5(bkey, key.length * bitsperchar);

	  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 * bitsperchar);
	  return core_md5(opad.concat(hash), 512 + 128);
	}
	return that;
}