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ATECC508A Arkusz danych(PDF) 65 Page - Microchip Technology

Numer części ATECC508A
Szczegółowy opis  Cryptographic Co-processor with Secure Hardware-Based Key Storage
PDF  109 Pages
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Producent  MICROCHIP [Microchip Technology]
Strona internetowa  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

ATECC508A Arkusz danych(HTML) 65 Page - Microchip Technology

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Figure 9-1. Data Flow for DeriveKey Command
Match
Parent
Key
Target
Key
SHA
(AUTH)
Input MAC
SHA
(Device)
Mode
Source
Key
Nonce
9.5
ECDH Command
The ECDH command on the ATECC508A computes the NIST ECDH algorithm to create a shared
premaster secret. The generated premaster secret will be either loaded into a slot in the data zone or be
output in the clear. Bit 2 in SlotConfig.ReadKey for the private key must be set to enable the ECDH
operation or this command will return an error.
The host processor may encrypt the premaster secret by writing it into the adjacent slot and then
executing an encrypted read of that slot to securely transfer the secret to the processor. Control of this
capability is determined solely by bit 3 of SlotConfig.ReadKey and cannot be modified with this command.
If this bit is set, then the least significant bit of KeyID (Param2) must be zero, and the premaster secret
slot number will be obtained by adding one to KeyID.
Table 9-16. Input Parameters
Name Size
Notes
Opcode ECDH
1
0x43
Param1 Mode
1
Bits 7-0:
Reserved for future use, must be zero.
Param2 KeyID
2
The private key to be used in the ECDH calculation.
Data1
X
32
The X component of the public key to be used for ECDH calculation.
Data2
Y
32
The Y component of the public key to be used for ECDH calculation.
Table 9-17. Output Parameter
Name
Size
Notes
Response
1 or 32 If the ECDH operation was successful:
•
If specified by SlotConfig.ReadKey<3>, the shared secret in the clear
ATECC508A
Security Commands
© 2017 Microchip Technology Inc.
Datasheet Complete
DS20005927A-page 65



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