Cryptocomputeaescmac; Table 12-8: Cryptocomputeaescmac Command; Table 12-9: Cryptocomputeaescmac Response; Table 12-7: Cryptoprocessjoinaccept Response - Semtech LR1110 User Manual

Table 12-7: CryptoProcessJoinAccept Response

Byte
Data from Host
Data to Host
• DecKeyID and VerKeyID are defined in
DecKeyID specifies the key used for decryption of the message.

VerKeyID specifies the key used for the MIC verification.

• Depending on the LoRaWanVer, the expected Header size N is 1 byte (v1.0) or 12 bytes (v1.1).
LoRaWanVer=0: LoRaWAN verison 1.0

LoRaWanVer=1: LoRaWAN verison 1.1

...

• Header1, ... ,HeaderN: Header
• Data1, ... ,DataN: Data. Data size M is either 16 Bytes or 32 Bytes. Data must include the encrypted MIC.
• CEStatus is defined in section

12.3.5 CryptoComputeAesCmac

The command CryptoComputeAesCmac( ) will compute the AES CMAC of the provided data using the specified Key and
return the MIC.

Table 12-8: CryptoComputeAesCmac Command

Byte
Data from Host
Data to Host

Table 12-9: CryptoComputeAesCmac Response

Byte 0
Data from Host 0x00
Data to Host Stat1
•
KeyID: specified Key ID, as defined in
•
Data1, Data2, ... , DataN: Provided data, considered as Byte buffers.
•
CEStatus: defined in section
•
MIC: Message Integrity Check (first 4 bytes of the CMAC).
LR1110
User Manual Rev.1.0
UM.LR1110.W.APP March 2020
0 1
0x00 0x00
Stat1 CEStatus
Table 12-1: Cryptographic Keys Usage and
CEStatus on page 107.
0 1
KeyID
0x05 0x05
(7:0)
IrqStatus
Stat1 Stat2
(31:24)
1
0x00
CEStatus
Table 12-1: Cryptographic Keys Usage and
CEStatus on page 107.
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2
0x00
Data1
2 3 4
Data1 Data2
IrqStatus IrqStatus
(23:16) (15:8)
2 3
0x00 0x00
MIC1 MIC2
...
...
... DataM
Derivation:
5 ...
Data3 ...
IrqStatus
...
(7:0)
4
0x00
MIC3
Derivation. Goes from 0 to 27.
M+3
0x00
N+3
DataN
0x00
5
0x00
MIC4
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