Cryptocomputeaescmac; Table 10-8: Cryptocomputeaescmac Command; Table 10-9: Cryptocomputeaescmac Response; Table 10-10: Cryptocomputeaescmac Command Example - Semtech LR1121 User Manual

10.3.5 CryptoComputeAesCmac

Command CryptoComputeAesCmac(...) computes the AES CMAC of the provided data using the specified Key and
returns the MIC.

Table 10-8: CryptoComputeAesCmac Command

Byte 0
Data from Host 0x05
Data to Host Stat1

Table 10-9: 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).
For example, when using the test vectors of the RFC4493 example 2, we would have:
•
Message: 6BC1BEE2 2E409F96 E93D7E11 7393172A (N=16)
•
MIC: 070A16B4

Table 10-10: CryptoComputeAesCmac Command Example

Byte 0
Data from Host 0x05
Data to Host Stat1

Table 10-11: CryptoComputeAesCmac Response Example

Byte 0
Data from Host 0x00
Data to Host Stat1
LR1121
User Manual Rev 1.1
UM.LR1121.W.APP Mar 2023
1 2
0x05 KeyID (7:0)
IrqStatus IrqStatus
Stat2
(31:24)
1
0x00
CEStatus
Table 10-1: Cryptographic Keys Usage and
CEStatus on page 103.
1 2
0x05 KeyID (7:0)
IrqStatus IrqStatus
Stat2
(31:24)
1
0x00
CEStatus
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3 4
Data1 Data2
IrqStatus
(23:16) (15:8)
2 3
0x00 0x00
MIC1 MIC2
Derivation; 2, 5, 12-17 are supported.
3 4
0x6b 0xc1
IrqStatus
(23:16) (15:8)
2 3
0x00 0x00
0x07 0x0a
5 ...
Data3 ...
IrqStatus
...
(7:0)
4
0x00
MIC3
5 ...
0xbe ...
IrqStatus
...
(7:0)
4
0x00
0x16
Proprietary & Confidential
N+2
DataN
0x00
5
0x00
MIC4
18
0x2a
0x00
5
0x00
0xb4
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