ATECC508A datasheet(3/109 Pages) MICROCHIP

3 / 109 page

Table of Contents

Features.......................................................................................................................... 1

Applications..................................................................................................................... 1

Package Types................................................................................................................2

1. Introduction................................................................................................................7

1.1.

Applications.................................................................................................................................. 7

1.2.

Device Features........................................................................................................................... 7

1.3.

Cryptographic Operation.............................................................................................................. 8

1.4.

Commands................................................................................................................................... 9

2. Device Organization................................................................................................ 10

2.1.

EEPROM Data Zone.................................................................................................................. 10

2.1.1.

Certificate Storage....................................................................................................... 11

2.2.

EEPROM Configuration Zone.................................................................................................... 13

2.2.1.

SlotConfig (Bytes 20 to 51)..........................................................................................16

2.2.2.

Read Permissions........................................................................................................17

2.2.3.

Write Permissions........................................................................................................18

2.2.4.

Writing ECC Private Keys............................................................................................19

2.2.5.

KeyConfig (Bytes 96 through 127)...............................................................................19

2.2.6.

Special Memory Values in the Config Zone (Bytes 0 through 12)............................... 23

2.3.

EEPROM One Time Programmable (OTP) Zone.......................................................................23

2.4.

EEPROM Locking...................................................................................................................... 24

2.4.1.

Configuration Zone Locking.........................................................................................24

2.4.2.

Data and OTP Zone Locking....................................................................................... 24

2.4.3.

Individual Slot Locking................................................................................................. 25

2.5.

Static RAM (SRAM) Memory......................................................................................................26

2.5.1.

TempKey......................................................................................................................26

3. Security Information.................................................................................................28

3.1.

Cryptographic Standards............................................................................................................28

3.1.1.

SHA-256...................................................................................................................... 28

3.1.2.

HMAC/SHA-256...........................................................................................................28

3.1.3.

Elliptic Curve Digital Signature Algorithm (ECDSA).................................................... 28

3.1.4.

Elliptic Curve Diffie-Hellman (ECDH)...........................................................................28

3.2.

Key Uses and Restrictions......................................................................................................... 29

3.2.1.

Diversified Keys........................................................................................................... 29

3.2.2.

Rolled Keys..................................................................................................................29

3.2.3.

Created ECC Keys...................................................................................................... 29

3.2.4.

Created Secret Keys....................................................................................................30

3.2.5.

High Endurance Monotonic Counters..........................................................................30

3.2.6.

Limited Use Key (Slot 15 only).................................................................................... 30

3.2.7.

Password Checking..................................................................................................... 31

Datasheet Complete

DS20005927A-page 3

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