Codegate 2015

good_crypto

function validate() {
	var x = document.forms["formxx"]["pwz"].value;
	alert(x);
	if (x == null || x == "") {
		alert("Password must be filled out");
		return false;
	}

	if (!x.match(/^[A-Za-z]+$/)) {
		alert("Bad charset");
		return false;
	}

	if (!sha1(x).match(/^ff7b948953ac/))
	{
		return false;
	}

	alert("Flag: " + x);
	return true;
}