ATECC508A datasheet(86/109 Pages) MICROCHIP

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Bits

Meaning

5–1 Must be 0.

Set to 0 if the resulting signature is intended to be used by Verify(Validate) or 1 if it is to be used by

Verify(Invalidate). In all other situations, this bit must be 0.

Internal signatures are always generated over digest information placed in TempKey by GenKey or

GenDig, and include further configuration information regarding the key used for the TempKey

calculation.

Note: If multiple GenKey or GenDig commands have been run between the Nonce and Sign

commands, only the configuration for the last key used will be signed.

The bit within the SlotLocked field corresponding to the last key used in the TempKey computation is in

the LSB of the byte listed below, regardless of whether or not the slot is individually lockable. This 55 byte

message is created as described in the next paragraph.

If the slot contains a public key corresponding to a supported curve, and if PubInfo indicates this key must

be validated before being used by Verify, and if the validity bits have a value of 0x05, then the PubKey

Valid byte will be 0x01. In all other cases, it will be 0x00.

32 bytes

TempKey (must have been generated by GenKey or GenDig)

1 byte

Opcode (0x41)

1 byte

Mode

2 bytes

KeyID

2 bytes

SlotConfig<TempKeyFlags.KeyID>

2 bytes

KeyConfig<TempKeyFlags.KeyID>

1 byte

TempKeyFlags (b<7> NoMacFlag, b<6> GenKeyData, b<5> GenDigData, b<4>

SourceFlag, b<3:0> KeyID)

2 byte

Zeros

1 byte

SN<8> (never zeroed out)

4 bytes

SN<4:7> (or zeros, see Mode)

2 bytes

SN<0:1> (never zeroed out)

2 bytes

SN<2:3> (or zeros, see Mode)

1 byte

SlotLocked<TempKeyFlags.KeyID> (Byte is 0x01 if SlotLocked Bit is set otherwise

0x00)

1 byte

PubKey Valid (or zero, see above)

1 byte

0x00

This message is then hashed using the SHA-256 algorithm and passed to the ECDSA signature

computation engine.

9.19

UpdateExtra Command

The UpdateExtra command is used to update the values of the two extra bytes within the configuration

zone (location 84 and 85) after the configuration zone has been locked.

ATECC508A

Security Commands

Datasheet Complete

DS20005927A-page 86

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