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