#!/usr/bin/python

#A simple xor encoder
#Xor the input file with 0-255
#Written by s1n4


import sys

def usage() :
	print 'Usage: %s [Key] [File]' % sys.argv[0]
	print '[Key] 0x00-0xff same as 0-255'
	exit()


def xor(key, fn) :
	try :
		Input = open(fn, 'rb').read()

	except IOError :
		usage()

	res = ''

	for i in Input :
		try :
			res += chr(ord(i) ^ eval(key))

		except :
			usage()


	try :
		Output = open(fn, 'wb')
		Output.write(res)

	finally :
		Output.close()
		print fn, 'xor', key


def main() :
	if len(sys.argv) == 3 :
		xor(sys.argv[1], sys.argv[2])

	else :
		usage()

main()

xor.py 0x4a test.txt