ATECC608A datasheet(56/81 Pages) MICROCHIP

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Table 5-85. Input Parameters - Non-Diversified MAC

Opcode

(1 Byte)

Mode

(1 Byte)

KeyID

(2 Bytes)

Data(2)

(0-32 Bytes)

Mode Descriptions

0x08

0x00

0x00 0[Slot] 32 bytes

• First 32 bytes loaded from data slot

• Second 32 bytes are taken from the input challenge

0x01 or 0x05(1) 0x00 0[Slot] 0 bytes

• First 32 bytes loaded from data slot

• Second 32 bytes are taken from TempKey

0x02 or 0x06(1) 0x00 00

32 bytes

• First 32 bytes loaded with TempKey

• Second 32 bytes are taken from the input challenge

Note:

(1) Mode[2] must match the TempKey.SourceFlag.

(2) When present, the Data parameter corresponds to the input challenge.

Table 5-86. Output Response - Non-Diversified MAC

Name

Size

Description

Response

1 byte

If the command fails

32 bytes

SHA-256 digest

Table 5-87. Non-Diversified MAC Calculation

# of Bytes

Mode 0x00

Mode 0x01 or 0x05

Mode 0x02 or 0x06

Data Slot

Input Challenge

Opcode (0x08)

Mode

KeyID

Zeros

SN[8] Varies by vendor

Zeros

SN[0:1] 0x01 0x23

Zeros

Data Slot

TempKey

Opcode (0x08)

Mode

KeyID

Zeros

SN[8] Varies by vendor

Zeros

SN[0:1] 0x01 0x23

Zeros

TempKey

Input Challenge

Opcode (0x08)

Mode

KeyID

Zeros

SN[8] Varies by vendor

Zeros

SN[0:1] 0x01 0x23

Zeros

5.3.6.2

Diversified MAC

A diversified MAC includes the serial number of the device. The serial number will be unique for each device and

therefore, will always generate a unique SHA256 digest. The MAC is always calculated over a total of 88 bytes and

always creates a 32-byte SHA256 digest.

Table 5-88. Input Parameters - Diversified MAC

Opcode

(1 Byte)

Mode

(1 Byte)

KeyID

(2 Bytes)

Data(2)

(0-32 Bytes)

Mode Descriptions

0x08

0x40

0x00 0[Slot] 32 bytes

• First 32 bytes loaded from data slot

• Second 32 bytes are taken from the input challenge

0x41 or 0x45(1) 0x00 0[Slot] 0 bytes

• First 32 bytes loaded from data slot

• Second 32 bytes are taken from TempKey

0x42 or 0x46(1) 0x00 00

32 bytes

• First 32 bytes loaded with TempKey

• Second 32 bytes are taken from the input challenge

ATECC608A-TNGLoRaWAN

Device Commands

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