ATECC508A datasheet(67/109 Pages) MICROCHIP

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Table 9-18. Input Parameters

Name

Size

Notes

Opcode

GenDig

0x15

Param1

Zone

If 0x00 (Config), then use KeyID to specify any of the four 256-bit blocks of the

Configuration zone. If KeyID has a value greater than three, the command will

return an error.

If 0x01 (OTP), use KeyID to specify either the first or second 256-bit block of the

OTP zone.

If 0x02 (Data), then KeyID specifies a slot in the Data zone or a transport key in

the hardware array.

If 0x03 (Shared Nonce), then KeyID specifies the location of the input value in the

message generation.

If 0x04 (Counter), then KeyID specifies the monotonic counter ID to be included in

the message generation.

If 0x05 (Key Config), then KeyID specifies the slot for which the configuration

information is to be included in the message generation.

All other values are reserved and must not be used.

Param2

KeyID

Identification number of the key to be used, selection of which OTP block or

message order for Shared Nonce mode.

Data1

OtherData

32 or 4

or 0

Four bytes of data for SHA calculation when using a NoMac key, 32 bytes for

“Shared Nonce” mode, otherwise ignored

Table 9-19. Output Parameter

Name

Size

Notes

Success

Upon successful execution, ATECC508A returns a value of zero.

If zone is “Shared Nonce” and KeyID<15> is zero then the SHA-256 message body used to create the

resulting new TempKey consists of the following bytes:

32 bytes

Input OtherData Parameter

1 byte

Opcode (always 0x15)

1 byte

Mode

1 byte

LSB of KeyID

1 byte

Zero

1 byte

SN<8>

2 bytes

SN<0:1>

25 bytes

Zeros

32 bytes

TempKey.value

If zone is “Shared Nonce” and KeyID<15> is one then the SHA-256 message body used to create the

resulting new TempKey consists of the following bytes:

ATECC508A

Security Commands

Datasheet Complete

DS20005927A-page 67

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