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ATSHA204 Datasheet(PDF) 39 Page - ATMEL Corporation

Part # ATSHA204
Description  Atmel CryptoAuthentication
PDF  65 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATSHA204 Datasheet(HTML) 39 Page - ATMEL Corporation

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



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