text: # MIT License
  
  # Copyright (c) 2017 Balazs Bucsay
  
  # Permission is hereby granted, free of charge, to any person obtaining a copy
  # of this software and associated documentation files (the "Software"), to deal
  # in the Software without restriction, including without limitation the rights
  # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  # copies of the Software, and to permit persons to whom the Software is
  # furnished to do so, subject to the following conditions:
  
  # The above copyright notice and this permission notice shall be included in all
  # copies or substantial portions of the Software.
  
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  # SOFTWARE.
  
  # this file is placeholder, most probably the structure of the checks will
  # change. So do not count on this file please.
  
  import sys
  
  if "checks.py" in sys.argv[0]:
  	print("[-] Instead of poking around just try: python xfltreat.py --help")
  	sys.exit(-1)
  
  import struct
  import random
  
  class Checks():
  	def __init__(self):
  		return
  
  	# generating challenge and saving the solution in the return values
  	def check_default_generate_challenge(self):
  		number1 = random.randint(0, 4294967295)
  		number2 = random.randint(0, 4294967295)
  		number3 = number1 ^ number2
  
  		return (struct.pack(">II", number1, number2), struct.pack(">I", number3))
  
  	# calculate result for challenge
  	def check_default_calculate_challenge(self, challenge):
  		numbers = struct.unpack(">II", challenge)
  		return struct.pack(">I", numbers[0] ^ numbers[1])