if self.challenge == None:
return message
crc = do_crc('%c%c'%(self.challenge >> 8, self.challenge & 0xff))
crc = do_crc(self.secret, crc)
crc = do_crc(message, crc)
if self.challenge == None:
return message
crc = do_crc('%c%c'%(self.challenge >> 8, self.challenge & 0xff))
crc = do_crc(self.secret, crc)
crc = do_crc(message, crc)