ATECC508A datasheet(20/109 Pages) MICROCHIP

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Table 2-12. KeyConfig Bits (Per Slot)

Bit

Name

Description

15-14 X509id

The index into the X509format array within the configuration zone (addresses 92-95)

which corresponds to this slot.

If the corresponding format byte is zero, then the public key can be validated by any

format signature by the parent.

If the corresponding format byte is non-zero, then the validating certificate must be of a

certain length; the stored public key must be located at a certain place within the message

and the SHA() commands must be used to generate the digest of the message.

Must be zero if the slot does not contain a public key.

RFU

Must be zero.

IntrusionDisable

0 = Then use of this key is independent of the state of the IntrusionLatch.

1 = Use of this key is prohibited for all commands other than GenKey if the

IntrusionLatch is zero. GenKey is permitted regardless of the state of the latch.

11-8 AuthKey

If ReqAuth is one, this field points to the key that must be used for authorization before the

key associated with this slot may be used.

Must be zero if ReqAuth is zero.

ReqAuth

0 = No prior authorization is required.

1 = Before this key must be used, a prior authorization using the key pointed to by

AuthKey must be completed successfully prior to cryptographic use of the key.

Applies to all key types, both public, secret, and private. See Section Authorized

Keys.

ReqRandom

This field controls the requirements for random nonces used by the following commands:

GenKey, MAC, HMAC, CheckMac, Verify, DeriveKey, and GenDig.

0 =

A random nonce is not required.

1 =

A random nonce is required.

Lockable

0 = SlotConfig and remaining KeyConfig bits control modification permissions.

1 = Slot can be individually locked using the Lock command. See the SlotLocked field

in the Configuration zone to determine whether a slot is currently locked or not.

Applies to all slots, regardless of whether or not they contain keys. See Section EEPROM

Locking.

4-2

KeyType

If the slot contains an ECC public or private key, then the key type field below must be set

to 0b100. If the slot contains any other kind of data, key, or secret, then this field must be

set to 0b111 for proper operation.

100 =

P256 NIST ECC key

111 =

Not an ECC key

All other values are RFU (Reserved for Future Use)

PubInfo

If Private indicates this slot contains an ECC private key:

ATECC508A

Device Organization

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