ATSHA204 ATMEL [ATMEL Corporation], ATSHA204 Datasheet - Page 39
ATSHA204
Manufacturer Part Number
ATSHA204
Description
Atmel CryptoAuthentication
Manufacturer
ATMEL [ATMEL Corporation]
Datasheet
1.ATSHA204.pdf
(65 pages)
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The key written to the target slot is the result of a SHA-256 of the following message:
The data flow for this command is shown graphically in the figure below:
Figure 8-1. Data Flow for DeriveKey Command
Input MAC
32 bytes
1 byte
1 byte
2 bytes
1 byte
2 bytes
25 bytes
32 bytes
Target or parent key (depending on SlotConfig Bit12)
Opcode
Param1
Param2
SN[8]
SN[0:1]
Zeros
TempKey.value
(AUTH)
Parent
Match
SHA
Key
Source
Key
(Derive)
Mode
SHA
Nonce
Target
Key
Atmel ATSHA204 [DATASHEET]
8740D−CRYPTO−3/12
39
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