lingmujianshi

def encrypt(string):
	key = 171
	result = pack('>I', len(string))
	for i in string:
		a = key ^ ord(i)
		key = a
		result += a.to_bytes(1,'big') #python2 : result += chr(a)
	return result

lingmujianshi

def decrypt(string):
	key = 171
	result = ""
	for i in string:
		a = key ^ i #python2 a = key ^ ord(i)
		key = i     #python2 key = ord(i)
		result += chr(a)
	return result