51 lines
1.3 KiB
Python
51 lines
1.3 KiB
Python
|
#
|
||
|
|
# frm_payload: appeui(8) deveui(8) devnonce(2)
|
||
|
|
#
|
||
|
|
from .MalformedPacketException import MalformedPacketException
|
||
|
|
from .AES_CMAC import AES_CMAC
|
||
|
|
|
||
|
|
|
||
|
|
class JoinRequestPayload:
|
||
|
|
|
||
|
|
def read(self, payload):
|
||
|
|
if len(payload) != 18:
|
||
|
|
raise MalformedPacketException("Invalid join request")
|
||
|
|
self.deveui = payload[8:16]
|
||
|
|
self.appeui = payload[:8]
|
||
|
|
self.devnonce = payload[16:18]
|
||
|
|
|
||
|
|
def create(self, args):
|
||
|
|
self.deveui = list(reversed(args['deveui']))
|
||
|
|
self.appeui = list(reversed(args['appeui']))
|
||
|
|
self.devnonce = args['devnonce']
|
||
|
|
|
||
|
|
def length(self):
|
||
|
|
return 18
|
||
|
|
|
||
|
|
def to_raw(self):
|
||
|
|
payload = []
|
||
|
|
payload += self.appeui
|
||
|
|
payload += self.deveui
|
||
|
|
payload += self.devnonce
|
||
|
|
return payload
|
||
|
|
|
||
|
|
def get_appeui(self):
|
||
|
|
return self.appeui
|
||
|
|
|
||
|
|
def get_deveui(self):
|
||
|
|
return self.deveui
|
||
|
|
|
||
|
|
def get_devnonce(self):
|
||
|
|
return self.devnonce
|
||
|
|
|
||
|
|
def compute_mic(self, key, direction, mhdr):
|
||
|
|
mic = [mhdr.to_raw()]
|
||
|
|
mic += self.to_raw()
|
||
|
|
|
||
|
|
cmac = AES_CMAC()
|
||
|
|
computed_mic = cmac.encode(bytes(key), bytes(mic))[:4]
|
||
|
|
return list(map(int, computed_mic))
|
||
|
|
|
||
|
|
def decrypt_payload(self, key, direction, mic):
|
||
|
|
return self.to_raw()
|