SecuritySystem: Startup

os.loadAPI('/.apis/sha')
local passHashHandle = fs.open('/SecuritySystem/.passhash','r')
local passHash = passHashHandle.readAll()
passHashHandle.close()
local w,h = term.getSize()
local logo = paintutils.loadImage("/SecuritySystem/logo")
local logoFile = fs.open("/SecuritySystem/logo",'r')
local lines = {}
for i in string.gmatch(logoFile.readAll(),"[^\n]+") do table.insert(lines, i) end
local imgWidth = 0
for i=1,#lines do if lines[i]:len()>imgWidth then imgWidth = lines[i]:len() end end
local imgHeight = #lines
logoFile.close()
function getPass()
  local inTerm = window.create(term.current(),w/2-6,h/2,13,1,true)
  local oldTerm = term.redirect(inTerm)
  term.setBackgroundColor(2^7)
  term.write("            ")
  term.setCursorPos(1,1)
  local _,out = pcall(read,"*")
  term.redirect(oldTerm)
  term.clear()
  term.setCursorPos(1,1)
  return out
end

term.clear()
if h > (imgHeight+4) then
  paintutils.drawImage(logo,math.ceil((w-imgWidth)/2),4)
  term.setBackgroundColor(colors.black)
  term.setCursorPos(math.ceil((w-string.len(os.version()))/2),1)
  print(os.version())
  term.setCursorPos(math.ceil((w-7)/2),2)
  print("Loading")
else
  term.setCursorPos(math.ceil((w-string.len(os.version()))/2),h/2-1)
  print(os.version())
  term.setCursorPos(math.ceil((w-7)/2),h/2+1)
  print("Loading")
end

pcall(sleep,3)
term.clear()
while true do
  term.setCursorPos(math.ceil((w-15)/2),h/2-2)
  term.write("Enter Password:")
  local input = getPass()
  term.setBackgroundColor(colors.black)
  if sha.sha256(input) == passHash then
    term.setCursorPos(math.ceil((w-8)/2),h/2)
    term.write("Correct!")
    pcall(sleep,2)
    break
  else
    term.setCursorPos(math.ceil((w-10)/2),h/2)
    term.write("Incorrect!")
    pcall(sleep,2)
  end
end
os.unloadAPI("/.apis/sha")
term.clear()
term.setCursorPos(1,1)
local version
local webH = http.get("http://pastebin.com/raw.php?i=1PM7BAGH")
if webH then version = webH.readAll() end
webH.close()
if version~="3" then
  print("SecuritySystem appears to be outdated. Do you wish to update? [Y/N] ")
  local _,key = os.pullEvent("key")
  sleep(0)
  if key==21 then
    shell.run("pastebin run E5VeZu7G")
  end
end
if fs.exists("/SecuritySystem/startup") then
  shell.run("/SecuritySystem/startup")
else
if term.isColor() then term.setTextColor(colors.yellow) end
print(os.version())
end