Minecraft OpenSecurity Keypad

function counter(tbl) --Gets the length of the table/array.
  local c=0
  for k in pairs(tbl) do c=c+1 end
  return c
end

local code = {"1","2", "3", "4", "5"} --Change to however you want, as long as you want.
local numbers = {"3","6","1","4","5","8","7","2","9","*","0","#"}

length = counter(code)  --Used to get the length of the code. Hence why it can be as long as you want.

local component = component or require("component")
local keypad = component.os_keypad
keypad.setEventName("DoorEntry")

function generator()  --Randomizes the keypad after each press.
  for i=1,11
  do
    j = i+1
    math.randomseed((os.time() * 2147483647) / 7)
    x = math.random(j,12)
    temp = numbers[i]
    numbers[i] = numbers[x]
    numbers[x] = temp
  end
  keypad.setKey(numbers,customButtonColor)
end

local event = event or require("event")
local doorcontroller = component.os_door

if (doorcontroller.isOpen())   --Checks to make sure the door is closed.
then
  doorcontroller.toggle()
end

customButtonColor = {"1", "1", "1" ,"1", "1", "1", "1", "1", "1", "1", "1", "1",}

local running = true

while running do
::restart::              --Label for repeating the loop
keypad.setDisplay("Enter ###")
local entry = {}
for i=1,length
do
  generator()
  local event, address, button, button_label = event.pull("DoorEntry")
  entry[i] = button_label
end

for i=1,length
do
  if (table.concat(entry) ~= table.concat(code))  --If Code entered doesn't match one on record
  then
    keypad.setDisplay("Bad ###")
    os.sleep(5)
    goto restart      --Then you go back to the beginning and re-enter it all again. Sucka!
  end
end
keypad.setDisplay("Enter")
doorcontroller.toggle()
os.sleep(2)
doorcontroller.toggle()
goto restart
end