var hexcase = 0;
var b64pad	= "";
var chrsz	 = 8;

function hex_sha1(s){return binb2hex(core_sha1(str2binb(s),s.length * chrsz));}
function b64_sha1(s){return binb2b64(core_sha1(str2binb(s),s.length * chrsz));}
function str_sha1(s){return binb2str(core_sha1(str2binb(s),s.length * chrsz));}
function hex_hmac_sha1(key, data){ return binb2hex(core_hmac_sha1(key, data));}
function b64_hmac_sha1(key, data){ return binb2b64(core_hmac_sha1(key, data));}
function str_hmac_sha1(key, data){ return binb2str(core_hmac_sha1(key, data));}

function sha1_vm_test()
{
	return hex_sha1("abc") == "a9993e364706816aba3e25717850c26c9cd0d89d";
}

function core_sha1(x, len)
{
	x[len >> 5] |= 0x80 << (24 - len % 32);
	x[((len + 64 >> 9) << 4) + 15] = len;

	var w = Array(80);
	var a =	1732584193;
	var b = -271733879;
	var c = -1732584194;
	var d =	271733878;
	var e = -1009589776;

	for(var i = 0; i < x.length; i += 16)
	{
		var olda = a;
		var oldb = b;
		var oldc = c;
		var oldd = d;
		var olde = e;

		for(var j = 0; j < 80; j++)
		{
			if(j < 16) w[j] = x[i + j];
			else w[j] = rol(w[j-3] ^ w[j-8] ^ w[j-14] ^ w[j-16], 1);
			var t = safe_add(safe_add(rol(a, 5), sha1_ft(j, b, c, d)),
											 safe_add(safe_add(e, w[j]), sha1_kt(j)));
			e = d;
			d = c;
			c = rol(b, 30);
			b = a;
			a = t;
		}

		a = safe_add(a, olda);
		b = safe_add(b, oldb);
		c = safe_add(c, oldc);
		d = safe_add(d, oldd);
		e = safe_add(e, olde);
	}
	return Array(a, b, c, d, e);

}

function sha1_ft(t, b, c, d)
{
	if(t < 20) return (b & c) | ((~b) & d);
	if(t < 40) return b ^ c ^ d;
	if(t < 60) return (b & c) | (b & d) | (c & d);
	return b ^ c ^ d;
}

function sha1_kt(t)
{
	return (t < 20) ?	1518500249 : (t < 40) ?	1859775393 :
				 (t < 60) ? -1894007588 : -899497514;
}

function core_hmac_sha1(key, data)
{
	var bkey = str2binb(key);
	if(bkey.length > 16) bkey = core_sha1(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_sha1(ipad.concat(str2binb(data)), 512 + data.length * chrsz);
	return core_sha1(opad.concat(hash), 512 + 160);
}

function safe_add(x, y)
{
	var lsw = (x & 0xFFFF) + (y & 0xFFFF);
	var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
	return (msw << 16) | (lsw & 0xFFFF);
}

function rol(num, cnt)
{
	return (num << cnt) | (num >>> (32 - cnt));
}

function str2binb(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) << (32 - chrsz - i%32);
	return bin;
}

function binb2str(bin)
{
	var str = "";
	var mask = (1 << chrsz) - 1;
	for(var i = 0; i < bin.length * 32; i += chrsz)
		str += String.fromCharCode((bin[i>>5] >>> (32 - chrsz - i%32)) & mask);
	return str;
}

function binb2hex(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] >> ((3 - i%4)*8+4)) & 0xF) +
					 hex_tab.charAt((binarray[i>>2] >> ((3 - i%4)*8	)) & 0xF);
	}
	return str;
}


function binb2b64(binarray)
{
	var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
	var str = "";
	for(var i = 0; i < binarray.length * 4; i += 3)
	{
		var triplet = (((binarray[i	 >> 2] >> 8 * (3 -	i	 %4)) & 0xFF) << 16)
								| (((binarray[i+1 >> 2] >> 8 * (3 - (i+1)%4)) & 0xFF) << 8 )
								|	((binarray[i+2 >> 2] >> 8 * (3 - (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 url = '/codeblue/verifycode.php?code=';
var captchaOK = 2;
function getHTTPObject(){
	try {
		req = new XMLHttpRequest();
	} catch (err1)
    {
    	try {
    		req = new ActiveXObject("Msxml12.XMLHTTP");
    	} catch (err2)
        {
        	try {
        		req = new ActiveXObject("Microsoft.XMLHTTP");
        	} catch (err3)
        	{
				req = false;
			}
        }
    }
    return req;
}
        
var http = getHTTPObject();        
function handleHttpResponse() {
	commentform = document.forms['commentform'];
	if (http.readyState == 4) {
		captchaOK = http.responseText;
		if(captchaOK != 1) {
			alert('De ingevoerde controle code is onjuist.');
			commentform.verify.value='';
			commentform.verify.focus();
			return false;
		} else {
			commentform.submit();
		}
	}
}


function checkcode(thecode) {
	http.open("GET", url + escape(thecode), true);
	http.onreadystatechange = handleHttpResponse;
	http.send(null);
}

function checkComment(){
	commentform = document.forms['commentform'];
	if(commentform.naam.value==''){
		alert('Geef alstublieft uw naam op.');
		commentform.naam.focus();
		return false;
	}
	if(commentform.mail.value==''){
		alert('Geef alstublieft uw e-mailadres op.');
		commentform.mail.focus();
		return false;
	}
	if (commentform.mail.value.indexOf("@") < 1){
		alert('Geef alstublieft een geldig e-mailadres op.');
		commentform.mail.focus();
		return false;
	}
	if(commentform.comment.value==''){
		alert('Geef alstublieft uw reactie op.');
		commentform.comment.focus();
		return false;
	}
	if(commentform.verify.value==''){
		alert('Neem alstublieft de waarde van de controleafbeelding over.');
		commentform.verify.focus();
		return false;
	}
	checkcode(commentform.verify.value);
	return false;
}