Semtech LoRa Edge LR1110, User Manual

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LR1110
User Manual
Rev.1.0
UM.LR1110.W.APP March 2020
110 of 130
Semtech
www.semtech.com
For example, when using the test vectors of the RFC4493 example 2, we would have:
• Message: 6bc1bee2 2e409f96 e93d7e11 7393172a (N=16)
• MIC: 070a16b4
Therefore, the CryptoComputeAesCmac ( ) command and response will be:
Table 12-10: CryptoComputeAesCmac Command Example
Table 12-11: CryptoComputeAesCmac Response Example
12.3.6
CryptoVerifyAesCmac
The command CryptoVerifyAesCmac( ) will compute the AES CMAC of the provided data using the specified Key, and
compare the provided MIC with the actual calculated MIC (first 4 bytes of the CMAC).
•
KeyID : specified Key ID, as defined in Table 12-1: Cryptographic Keys Usage and Derivation . Goes from 0 to 27.
•
ExpectedMIC : Provided MIC (first 4 bytes of the CMAC).
Byte 0 1 2 3 4 5 … N+3
Data from Host 0x05 0x05
KeyID
(7:0)
0x6b 0xc1 0xbe ... 0x2a
Data to Host Stat1 Stat2
IrqStatus
(31:24)
IrqStatus
(23:16)
IrqStatus
(15:8)
IrqStatus
(7:0)
… 0x00
Byte 0 1 2 3 4 5
Data from Host 0x00 0x00 0x00 0x00 0x00 0x00
Data to Host Stat1 CEStatus 0x07 0x0a 0x16 0xb4
Table 12-12: CryptoVerifyAesCmac Command
Byte 0 1 2 3 4 5 6 7 … N+7
Data from Host 0x05 0x06
KeyID
(7:0)
Exp.
MIC1
Exp.
MIC2
Exp
MIC3
Exp
MIC4
Data1 … DataN
Data to Host Stat1 Stat2
Irq
Status
(31:24)
Irq
Status
(23:16)
Irq
Status
(15:8)
Irq
Status
(7:0)
0x00 0x00 … 0x00
Table 12-13: CryptoVerifyAesCmac
Byte 0 1
Data from Host 0x00 0x00
Data to Host Stat1 CEStatus