local function pb(paste,file)
local response = http.get("http://pastebin.com/raw/"..paste)
local sResponse = response.readAll()
response.close()
local file = fs.open( file, "w" )
file.write(sResponse)
end

local MOD = 2^32
local MODM = MOD-1

local function memoize(f)
	local mt = {}
	local t = setmetatable({}, mt)
	function mt:__index(k)
		local v = f(k)
		t[k] = v
		return v
	end
	return t
end

local function make_bitop_uncached(t, m)
	local function bitop(a, b)
		local res,p = 0,1
		while a ~= 0 and b ~= 0 do
			local am, bm = a % m, b % m
			res = res + t[am][bm] * p
			a = (a - am) / m
			b = (b - bm) / m
			p = p*m
		end
		res = res + (a + b) * p
		return res
	end
	return bitop
end

local function make_bitop(t)
	local op1 = make_bitop_uncached(t,2^1)
	local op2 = memoize(function(a) return memoize(function(b) return op1(a, b) end) end)
	return make_bitop_uncached(op2, 2 ^ (t.n or 1))
end

local bxor1 = make_bitop({[0] = {[0] = 0,[1] = 1}, [1] = {[0] = 1, [1] = 0}, n = 4})

local function bxor(a, b, c, ...)
	local z = nil
	if b then
		a = a % MOD
		b = b % MOD
		z = bxor1(a, b)
		if c then z = bxor(z, c, ...) end
		return z
	elseif a then return a % MOD
	else return 0 end
end

local function band(a, b, c, ...)
	local z
	if b then
		a = a % MOD
		b = b % MOD
		z = ((a + b) - bxor1(a,b)) / 2
		if c then z = bit32_band(z, c, ...) end
		return z
	elseif a then return a % MOD
	else return MODM end
end

local function bnot(x) return (-1 - x) % MOD end

local function rshift1(a, disp)
	if disp < 0 then return lshift(a,-disp) end
	return math.floor(a % 2 ^ 32 / 2 ^ disp)
end

local function rshift(x, disp)
	if disp > 31 or disp < -31 then return 0 end
	return rshift1(x % MOD, disp)
end

local function lshift(a, disp)
	if disp < 0 then return rshift(a,-disp) end
	return (a * 2 ^ disp) % 2 ^ 32
end

local function rrotate(x, disp)
    x = x % MOD
    disp = disp % 32
    local low = band(x, 2 ^ disp - 1)
    return rshift(x, disp) + lshift(low, 32 - disp)
end

local k = {
	0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
	0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
	0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
	0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
	0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
	0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
	0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
	0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
	0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
	0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
	0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
	0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
	0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
	0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
	0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
	0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2,
}

local function str2hexa(s)
	return (string.gsub(s, ".", function(c) return string.format("%02x", string.byte(c)) end))
end

local function num2s(l, n)
	local s = ""
	for i = 1, n do
		local rem = l % 256
		s = string.char(rem) .. s
		l = (l - rem) / 256
	end
	return s
end

local function s232num(s, i)
	local n = 0
	for i = i, i + 3 do n = n*256 + string.byte(s, i) end
	return n
end

local function preproc(msg, len)
	local extra = 64 - ((len + 9) % 64)
	len = num2s(8 * len, 8)
	msg = msg .. "\128" .. string.rep("\0", extra) .. len
	assert(#msg % 64 == 0)
	return msg
end

local function initH256(H)
	H[1] = 0x6a09e667
	H[2] = 0xbb67ae85
	H[3] = 0x3c6ef372
	H[4] = 0xa54ff53a
	H[5] = 0x510e527f
	H[6] = 0x9b05688c
	H[7] = 0x1f83d9ab
	H[8] = 0x5be0cd19
	return H
end

local function digestblock(msg, i, H)
	local w = {}
	for j = 1, 16 do w[j] = s232num(msg, i + (j - 1)*4) end
	for j = 17, 64 do
		local v = w[j - 15]
		local s0 = bxor(rrotate(v, 7), rrotate(v, 18), rshift(v, 3))
		v = w[j - 2]
		w[j] = w[j - 16] + s0 + w[j - 7] + bxor(rrotate(v, 17), rrotate(v, 19), rshift(v, 10))
	end

	local a, b, c, d, e, f, g, h = H[1], H[2], H[3], H[4], H[5], H[6], H[7], H[8]
	for i = 1, 64 do
		local s0 = bxor(rrotate(a, 2), rrotate(a, 13), rrotate(a, 22))
		local maj = bxor(band(a, b), band(a, c), band(b, c))
		local t2 = s0 + maj
		local s1 = bxor(rrotate(e, 6), rrotate(e, 11), rrotate(e, 25))
		local ch = bxor (band(e, f), band(bnot(e), g))
		local t1 = h + s1 + ch + k[i] + w[i]
		h, g, f, e, d, c, b, a = g, f, e, d + t1, c, b, a, t1 + t2
	end

	H[1] = band(H[1] + a)
	H[2] = band(H[2] + b)
	H[3] = band(H[3] + c)
	H[4] = band(H[4] + d)
	H[5] = band(H[5] + e)
	H[6] = band(H[6] + f)
	H[7] = band(H[7] + g)
	H[8] = band(H[8] + h)
end

local function sha256(msg)
	msg = preproc(msg, #msg)
	local H = initH256({})
	for i = 1, #msg, 64 do digestblock(msg, i, H) end
	return str2hexa(num2s(H[1], 4) .. num2s(H[2], 4) .. num2s(H[3], 4) .. num2s(H[4], 4) ..
		num2s(H[5], 4) .. num2s(H[6], 4) .. num2s(H[7], 4) .. num2s(H[8], 4))
end
if not http then
printError("Xeon OS needs the http API")
return
end
shell.run("pastebin get 2wxQPtuv Xeon/System/installationbackground")
term.setTextColor(colors.black)
term.setBackgroundColor(colors.white)
local isp = paintutils.loadImage("Xeon/System/installationbackground")
paintutils.drawImage(isp,1,1)

local function continuebutton()
term.setTextColor(colors.black)
term.setBackgroundColor(colors.white)
term.setCursorPos(35,15)
print("Continue")
 local event, button, x, y = os.pullEvent("mouse_click")
if y == 15 and x < 43 and x > 34 and button == 1 then
continued = 1
end
end

term.setTextColor(colors.black)
term.setBackgroundColor(colors.white)
term.setCursorPos(13,8)
print("Please wait while Xeon OS ")
term.setCursorPos(11,9)
print("downloads the necessary Files...")

pb("PyYKSwFk","Xeon/System/login")
pb("ChNyQYEm","Xeon/System/welcome")
pb("Di9SWCeC","Xeon/System/bkgd")
pb("gLLy8GSd","Xeon/System/black")
pb("zm2rKe83","Xeon/System/defaultuser.paint")
pb("kFysEaaF","Xeon/System/Exit.paint")
pb("ZsGuGi0M","Xeon/System/lightB")
pb("Kh1Y54F7","Xeon/System/logo")
pb("772v6E6D","Xeon/System/menu10")
pb("sqsS8S0S","Xeon/System/system")
pb("PuBekjhj","Xeon/System/white")
pb("zY24cE2L","Xeon/System/updater")
pb("yf0hGAEi","Xeon/System/execute")
pb("DL1fgXwe","Xeon/System/exitscreen")
pb("umYiNCt5","Xeon/System/optionswindow")
pb("6tztv9dq","Xeon/System/optionswindow2")
pb("KAeHtrRE","Xeon/System/powermenu")
pb("6te2Eqi3","Xeon/System/searchbar")
pb("2wxQPtuv","Xeon/System/installationbackground")
pb("HA3UwBjm","startup")

paintutils.drawImage(isp,1,1)
term.setCursorPos(13,8)
term.setTextColor(colors.black)
term.setBackgroundColor(colors.white)
print("    Welcome to Xeon OS !")
while true do
continuebutton()
if continued == 1 then
continued = 0
paintutils.drawImage(isp,1,1)
term.setCursorPos(13,8)
term.setTextColor(colors.black)
term.setBackgroundColor(colors.white)
print("Please choose a Username !")
term.setCursorPos(13,11)
local user = read()
paintutils.drawImage(isp,1,1)
term.setCursorPos(13,8)
term.setTextColor(colors.black)
term.setBackgroundColor(colors.white)
print("Please choose a Password !")
term.setCursorPos(13,11)
local pass = read("*")
paintutils.drawImage(isp,1,1)
term.setCursorPos(13,8)
term.setTextColor(colors.black)
term.setBackgroundColor(colors.white)
print("Please repeat the Password !")
term.setCursorPos(13,11)
local pass2 = read("*")
if pass == pass2 then
local vpass = sha256(pass)
local filez = fs.open("Xeon/Users/"..user,"a")
filez.writeLine(vpass)
paintutils.drawImage(isp,1,1)
term.setCursorPos(13,8)
term.setTextColor(colors.black)
term.setBackgroundColor(colors.white)
print("Installation finished !")
term.setCursorPos(13,9)
term.setTextColor(colors.black)
term.setBackgroundColor(colors.white)
pb("Kh1Y54F7","Xeon/System/new")
print("The OS will reboot now...")
sleep(2)
os.reboot()
else
term.setCursorPos(13,11)
term.setTextColor(colors.red)
textutils.slowPrint(" The passwords dont match !  ")
term.setTextColor(colors.black)
end
end
end