local CRCLimit = tonumber("FFFF", 16)

function CheckSum(text)
	local counter = 1

	for i=1,string.len(text) do
		counter = counter + ((string.byte(string.sub(text, i, i))) * i * 17)
	end
	
	counter = math.mod(counter, CRCLimit)
	return string.format("%x", counter)
end