// JavaScript Document //

var fourseasons = {
		key: 'sdoiewjf2'
}

function cleartext(el) {
	if (el.value="enter email address") {
		el.value="";
	}
}

function privacy()
{
	var Win = window.open("http://www.fourseasons.com/privacy.html","Privacy",'width=840,scrollbars=yes,menubar=yes,toolbar=yes,status=no,resize=yes');
}

function terms()
{
	var Win = window.open("http://www.fourseasons.com/legal.html","Privacy",'width=840,scrollbars=yes,menubar=yes,toolbar=yes,status=no,resize=yes');
}

function encrypt(str) {
	var pwd = fourseasons.key;
	if(pwd == null || pwd.length <= 0) {
		//alert("Please enter a password with which to encrypt the message.");
		return null;
	}
	
	var prand = "";
	for(var i=0; i<pwd.length; i++) {
		prand += pwd.charCodeAt(i).toString();
	}
	
	var sPos = Math.floor(prand.length / 5);
	var mult = parseInt(prand.charAt(sPos) + prand.charAt(sPos*2) + prand.charAt(sPos*3) + prand.charAt(sPos*4) + prand.charAt(sPos*5));
	var incr = Math.ceil(pwd.length / 2);
	var modu = Math.pow(2, 31) - 1;
	
	if(mult < 2) {
		//alert("Algorithm cannot find a suitable hash. Please choose a different password. \nPossible considerations are to choose a more complex or longer password.");
		return null;
	}
	
	var salt = Math.round(Math.random() * 1000000000) % 100000000;
	prand += salt;
	
	while(prand.length > 10) {
		prand = (parseInt(prand.substring(0, 10)) + parseInt(prand.substring(10, prand.length))).toString();
	}

	prand = (mult * prand + incr) % modu;
	var enc_chr = "";
	var enc_str = "";
	
	for(var i=0; i<str.length; i++) {
		enc_chr = parseInt(str.charCodeAt(i) ^ Math.floor((prand / modu) * 255));
		if(enc_chr < 16) {
			enc_str += "0" + enc_chr.toString(16);
		} 
		else {
			enc_str += enc_chr.toString(16);
		}
		prand = (mult * prand + incr) % modu;
	}
	salt = salt.toString(16);
	while(salt.length < 8) salt = "0" + salt;
	enc_str += salt;
	return enc_str;
}

function decrypt(str) {
	var pwd = fourseasons.key;
	
	if(str == null || str.length < 8) {
		//alert("A salt value could not be extracted from the encrypted message because it's length is too short. The message cannot be decrypted.");
		return;
	}
	
	if(pwd == null || pwd.length <= 0) {
		//alert("Please enter a password with which to decrypt the message.");
		return;
	}
	
	var prand = "";
	for(var i=0; i<pwd.length; i++) {
		prand += pwd.charCodeAt(i).toString();
	}
	
	var sPos = Math.floor(prand.length / 5);
	var mult = parseInt(prand.charAt(sPos) + prand.charAt(sPos*2) + prand.charAt(sPos*3) + prand.charAt(sPos*4) + prand.charAt(sPos*5));
	var incr = Math.round(pwd.length / 2);
	var modu = Math.pow(2, 31) - 1;
	var salt = parseInt(str.substring(str.length - 8, str.length), 16);
	str = str.substring(0, str.length - 8);
	prand += salt;
	
	while(prand.length > 10) {
		prand = (parseInt(prand.substring(0, 10)) + parseInt(prand.substring(10, prand.length))).toString();
	}
	
	prand = (mult * prand + incr) % modu;
	var enc_chr = "";
	var enc_str = "";
	
	for(var i=0; i<str.length; i+=2) {
		enc_chr = parseInt(parseInt(str.substring(i, i+2), 16) ^ Math.floor((prand / modu) * 255));
		enc_str += String.fromCharCode(enc_chr);
		prand = (mult * prand + incr) % modu;
	}
	
	return enc_str;
}