// parseUri 1.2.2
// (c) Steven Levithan <stevenlevithan.com>
// MIT License
// http://blog.stevenlevithan.com/archives/parseuri
function parseUri (str) {
	var	o   = parseUri.options,
		m   = o.parser[o.strictMode ? "strict" : "loose"].exec(str),
		uri = {},
		i   = 14;

	while (i--) uri[o.key[i]] = m[i] || "";

	uri[o.q.name] = {};
	uri[o.key[12]].replace(o.q.parser, function ($0, $1, $2) {
		if ($1) uri[o.q.name][$1] = $2;
	});

	return uri;
};

parseUri.options = {
	strictMode: false,
	key: ["source","protocol","authority","userInfo","user","password","host","port","relative","path","directory","file","query","anchor"],
	q:   {
		name:   "queryKey",
		parser: /(?:^|&)([^&=]*)=?([^&]*)/g
	},
	parser: {
		strict: /^(?:([^:\/?#]+):)?(?:\/\/((?:(([^:@]*)(?::([^:@]*))?)?@)?([^:\/?#]*)(?::(\d*))?))?((((?:[^?#\/]*\/)*)([^?#]*))(?:\?([^#]*))?(?:#(.*))?)/,
		loose:  /^(?:(?![^:@]+:[^:@\/]*@)([^:\/?#.]+):)?(?:\/\/)?((?:(([^:@]*)(?::([^:@]*))?)?@)?([^:\/?#]*)(?::(\d*))?)(((\/(?:[^?#](?![^?#\/]*\.[^?#\/.]+(?:[?#]|$)))*\/?)?([^?#\/]*))(?:\?([^#]*))?(?:#(.*))?)/
	}
};

function generate_password()
{
    // symbols 32 - 47 / 58 - 64 / 91 - 96 / 123 - 126
    // numbers 48 - 57
    // upper 65 - 90
    // lower 97 - 122
    var symbols = new Array(40, 47, 48, 57, 65, 90, 97, 122, 123, 126);
    // var symbols = new Array(32, 47, 58, 64, 91, 96, 123, 126, 48, 57, 65, 90, 97, 122);

    field = document.getElementById("new_password");

    var res = "";
    //for(i=0; i<16; i++)
    while (res.length < 16)
    {
	a = Math.round(Math.random() * (symbols.length/2) * 2);
	diff = symbols[a+1] - symbols[a];
	r = Math.round(Math.random()*diff);
	if (isNaN(r+symbols[a]))
	    continue;
	res += String.fromCharCode(r + symbols[a]); 
    }

    field.value = res;
}

function url_domain(data) {
    var uri = parseUri(data)
   return uri['host'];
}

function a2hex(str) {
    var hex = '';
    for (var i = 0; i < str.length; i++)
    {
	c = str.charCodeAt(i).toString(16);
	if (c.length == 1) c = "0" + c;
        hex += c;
    }
    return hex;
}

function derive_mkey(user, mkey_target)
{
    mkey_target = document.getElementById(mkey_target) ;
    mkey = mkey_target.value;

    if (mkey.length == 0)
    {
	alert('Empty master key');
	return false;
    }

    url = url_domain(document.URL) + "/" + user;

    mkey = a2hex(pkdbf2(mkey, url, 1000, 256/8));
    mkey_target.value = mkey;

    return true;
}