xor_file.py

#! /usr/bin/python3

import sys

#MainUnit
key = b'\x7a\x49\x1e\xeb\x33\x28\x2b\x8b\x84\xa7\xad\x47\xb8\x31\x03\xd0'

def main():
	fileIn = open(str(sys.argv[1]), "rb")
	fileOut = open("file.out", "ab")

	try:
		chunk = fileIn.read(16)
		while(chunk):
			for byte, bKey in zip(chunk, key):      ## Foreach threw chunk and key and XOR their values
				xorByte = byte ^ bKey
				#xorByte = xorByte ^ bKey       ## Integrity Check
				#print(bytes([xorByte]))        ## My Welfare Check
				fileOut.write(bytes([xorByte]))
			chunk = fileIn.read(16)
	finally:
		fileIn.close()

	fileOut.close()

if(__name__ == "__main__"):
	if(len(sys.argv) !=2):
		print("Usage: ./xor_file.py <fileName>")
		exit()

	main()