simple crc check using python

crc_encode.py

def crc_encode(self, message, length):
	new_message = message
	crc = 0
	hex_crc = 0x91

	#lopp through each letter in string and store the xor value
	for x in range(length):
		crc ^= ord(message[x])

		#loop through each bit in char and check if it
		for y in range(8):
			if(crc & 1):
				crc ^=hex_crc
			crc >>= 1

	return chr(crc)