ATECC608A datasheet(27/81 Pages) MICROCHIP

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Device Commands

The following section details all of the commands broken out by Command mode that are allowed in the

ATECC608A-TNGLoRaWAN. The commands have been broken into three categories:

General Device Commands

These commands fall into two categories:

• General device access commands that are used to send data to the device or retrieve data but typically

do not perform any cryptographic functions.

• General cryptographic commands that can be used by the device or the system but typically do not

operate on specific data slots.

Asymmetric Cryptography Commands

These commands perform asymmetric cryptographic operations, such as key generation, message signing

and message verification that utilize an ECC public or private key. These commands are limited to use on ECC

Data zone slots.

Symmetric Cryptography Commands

These commands perform a symmetric cryptographic function, such as generating a digest or MAC, key

derivation or AES encryption and decryption.

Input Parameters for all Commands

Multibyte input parameters are shown as big-endian (MSB first) values in the input parameters tables unless

otherwise specified. Note that the ATECC608A-TNGLoRaWAN device actually expects the data to be sent little-

endian (LSB first).

Table 5-1. Command Opcodes, Short Descriptions, and Categories

Command

Opcode Description

Command Category

AES

0x51

Execute the AES-ECB Encrypt or Decrypt functions. Calculate a

Galois Field Multiply.

Symmetric Cryptography

Command

CheckMac

0x28

Verify a MAC calculated on another CryptoAuthentication device.

Symmetric Cryptography

Command

Counter

0x24

Read or increment one of the monotonic counters

General Device Commands

DeriveKey

0x1C

Derive a target key value from the target or parent key.

Symmetric Cryptography

Command

ECDH

0x43

Generate an ECDH pre-master secret using stored private key and

input public key.

Asymmetric Cryptography

Command

GenDig

0x15

Generate a data digest from a random or input seed and a stored

value.

Symmetric Cryptography

Command

GenKey

0x40

Generate an ECC public key. Optionally generate an ECC private

key.

Asymmetric Cryptography

Command

Info

0x30

Return device state information.

General Device Commands

KDF

0x56

Implement the PRF or HKDF key derivation functions

Symmetric Cryptography

Command

Lock

0x17

Prevent further modifications to a zone or slot of the device.

General Device Commands

MAC

0x08

Calculate digest (response) from key and other internal data using

SHA-256.

Symmetric Cryptography

Command

Nonce

0x16

Generate a 32-byte random number and an internally stored Nonce.

General Device Commands

Random

0x1B

Generate a random number.

General Device Commands

ATECC608A-TNGLoRaWAN

Device Commands

Complete Datasheet

DS40002154B-page 27

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