login

write("Username: ")
status, username = pcall(read)

file = fs.open("/etc/passwd/"..username, "r")

if (file == nil or file.readAll() == "") then
    error("User "..username.." does not exist.")
end

write("Password: ")
status, password = pcall(read, "*")

testhash = sha256.sha256(password)
passhash = file.read()

if (testhash == passhash) then