ATECC508A datasheet(12/109 Pages) MICROCHIP

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Table 2-4. Certificate Storage

X.509 Certificate

Encoded Certificate

X.509 Element

Size (Bytes)

Encoded Certificate Element

Device Cert

(Bits)

Signer Cert

(Bits)

Serial Number

8-20

Serial number source

Issue Date

Compressed format

Expire Date

Number of years before expiration

Signer ID(2)

ID of the specific signer used to sign

the certificate (device cert) or of the

signer itself (signer cert)

AuthorityKeyIdentifier

SHA1 HASH of the authority public

key

SubjectKeyIdentifier

SHA1 HASH of the subject public key

Signature R

Stored in device

256

Signature S

Stored in device

256

Public Key X(1)

Calculated from private key or stored

in device(1)

256

Public Key Y(1)

Calculated from private key or stored

in device(1)

256

N/A

Cert format

N/A

Template ID

N/A

Chain ID

N/A

Reserved/user defined

Total

(206 to 218

Bytes)

576 bits/(72

Bytes)

1088 bits/(136

Bytes)

Note:

For the device certificate the device public key can be regenerated from the private key. For the

signer certificate the Public Key would typically be stored in a separate slot.

For the device, the ID of the signer used to sign the certificate. For the signer, the ID of the signer

certificate so that it can be identified by the device.

Slot 8 contains a total of 416 bytes. Depending on the size of the serial number stored in the cert, it may

or may not be possible to store two complete certificates. Often within devices where a chain of trust has

been created, the device certificate, the signer certificate and the signer public key must be stored within

the device.

For more information, see the Compressed Certificate Definition application note, which can be found at

http://ww1.microchip.com/downloads/en/AppNotes/Atmel-8974-CryptoAuth-ATECC-Compressed-

Certificate-Definition-ApplicationNote.pdf

ATECC508A

Device Organization

Datasheet Complete

DS20005927A-page 12

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