ATECC608A datasheet(48/81 Pages) MICROCHIP

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Table 5-61. Input Parameters CheckMac

Opcode

(1 Byte)

Mode

(1 Byte)(2)

KeyID

(2 Bytes)

Data

(77 Bytes)(1)

Description

0x28

0x00

0x00 0[Slot]

• 32-byte client challenge

• 32-byte response generated by the client

• 13 bytes other data

0x01

0x00 0[Slot]

• 32 bytes ignored but must be present

• 32-byte client response

• 13 bytes other data

Use if TempKey.SourceFlag was

random

0x05

0x00 0[Slot]

Use if TempKey.SourceFlag was

fixed

0x02

0x00 00

• 32-byte client challenge

• 32-byte client response

• 13 bytes other data

Use if TempKey.SourceFlag was

random

0x06

0x00 00

Use if TempKey.SourceFlag was

fixed

Notes:

OtherData[0:12] values must match the values used in the original MAC command.

For modes other than 0x00, Mode[2] must match the TempKey.SourceFlag.

Table 5-62. Output Response CheckMac

Name

Size

Description

Response

1 byte

• 0x00 - If successful

• 0x01 - If there is a mismatch

• Error Code - If there is a failure

Table 5-63. SHA256 CheckMac Hash

# of Bytes

Mode 0x00

Mode 0x01 or 0x05

Mode 0x02 or 0x06

Key[KeyID]

TempKey

Input Client Challenge

TempKey

Input Client Challenge

OtherData[0:3]

Zeros

OtherData[4:6]

SN[8] = Varies by vendor

OtherData[7:10]

SN[0:1] = 0x01 0x23

OtherData[11:12]

5.3.3

DeriveKey Command

The device combines the current value of a key with the nonce stored in TempKey using SHA-256 and places the

result into the target key slot. Specific bits of the Slot Configurations affect the way this command works.

• SlotConfig[TargetKey].Bit13 must be set or DeriveKey will return an error.

• DeriveKey always returns an error if KeyConfig indicates that the slot contains an ECC private key, if the

Configuration zone has not been locked, or if the TargetKey slot is individually locked using SlotLocked.

• SlotConfig[TargetKey].Bit 12

ATECC608A-TNGLoRaWAN

Device Commands

Complete Datasheet

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