ATECC508A datasheet(16/109 Pages) MICROCHIP

16 / 109 page

Byte

Name

Description

Write

Read

validated with Verify(Validate). Unused bytes within this array

must be zero, otherwise, the formatting must be as follows:

Bits 7–4: TemplateLength. The total number of blocks in the entire

SHA sequence which are required for the

Verify(ValidateExternal) command to properly validate a

public key.

Bits 3–0: PublicPosition. The block number in which the public key

must be inserted in the SHA sequence for the

Verify(ValidateExternal) command to properly validate a

public key.

96–

127

KeyConfig

Two bytes of additional access and usage permissions and controls

for each slot of the data zone. See Section KeyConfig (Bytes 96

through 127).

If Config

unlocked

Always

2.2.1

SlotConfig (Bytes 20 to 51)

The 16 SlotConfig elements are used to configure the access protections for each of the 16 slots within

the ATECC508A device. Each configuration element consists of 16 bits, which control the usage and

access for that particular slot or key. The SlotConfig field is interpreted according to the following table

when the Data zone is locked. When the Data zone is unlocked, these restrictions generally do not apply,

and those slots not configured to contain private keys may freely be written and none may be read.

Table 2-6. SlotConfig Bits (Per Slot)

Bit

Name

Description

15-12 WriteConfig

Controls the ability to modify the data in this slot.

See Table 2-8, Table 2-9, Table 2-10, Table 2-11, and Write Command.

11-8 WriteKey

Use this key to validate and encrypt data written to this slot. See Section Write Command.

IsSecret

0 = The contents of this slot should contain neither confidential data nor keys. The GenKey

and Sign commands will fail if IsSecret is set to zero for any ECC private key.

1 = The contents of this slot are secret – Clear text reads are prohibited and both 4-byte

reads and writes are prohibited. This bit must be set if EncryptRead is a one or if

WriteConfig has any value other than Always to ensure proper operation of the device.

See Table 2-7 for additional information.

EncryptRead

0 = Clear text reads may be permitted.

1 = Reads from this slot will be encrypted using the procedure specified in the Read

command (Section Read Command) using ReadKey (bits 3-0 in this table) to generate

the encryption key. No input MAC is required. If this bit is set, then IsSecret must also

be set (in addition, see the following Table 2-7)

LimitedUse

0 = There are no usage limitations.

1 = The key stored in the slot is “Limited Use”. See Sections High Endurance Monotonic

Counters and Limited Use Key (Slot 15 only).

NoMac

0 = The key stored in the slot can be used by all commands.

ATECC508A

Device Organization

Datasheet Complete

DS20005927A-page 16

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