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-- token here
local key = "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
local random = require("ccryptolib.random")
local aead = require("ccryptolib.aead")

local seed = ""
-- this isnt exactly secure, but its fine, probably..
for i=1,64 do
  seed = seed .. string.char(math.random(0, 255))
end

random.init(seed)

local function encrypt(message)
  local nonce = random.random(12)
  local ciphertext, tag = aead.encrypt(key, nonce, message, "")

  return nonce..tag..ciphertext
end

local function decrypt(message)
  local ciphertextLength = #message-12-16

  if ciphertextLength < 0 then
    printError("message too short, this may be caused by other traffic on the same port")
    return
  end

  if ciphertextLength >= 32768 then
    printError("message too large, this may be caused by other traffic on the same port")
    return
  end

  local nonce, tag, endPos = string.unpack("c12c16", message)
  local ciphertext = message:sub(endPos)

  local decryptedMessage = aead.decrypt(key, nonce, tag, ciphertext, "") -- this is nil if auth failed

  if not decryptedMessage then
    printError("message auth invalid")
    return
  end

  return decryptedMessage
end

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