ATECC608A datasheet(40/81 Pages) MICROCHIP

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Name

Mode

Size

Description

Response

0x0C

32 bytes

Shared Master Secret as clear text

Response

OutNonce

0x0E

32 bytes

Shared Master Secret as encrypted text

nonce used for encryption

Response

0x08

1 byte

0x00 if successful, otherwise an error code is returned

5.2.1.2

ECDH - TempKey Source

The ECDH command may use the value in TempKey as its starting value for an ECDH command. The ECC private key

value in TempKey must be generated by the GenKey command. Once the TempKey has been used by the ECDH

command, the TempKey.Valid flag is reset. If the output is back to the TempKey location, then this flag will be set

again.

Table 5-40. Input Parameters ECDH TempKey

Opcode

(1 Byte)

Mode

(1 Byte)

KeyId

(2 Bytes)

Data

Description

Data 1

(32 Bytes)

Data 2

(32 Bytes)

0x43

0x0D

0x00 00

X component of

public key

Y component of

public key

• Results sent to the output

buffer

• Output is in the clear(1)

0x0F

0x00 00

X component of

public key

Y component of

public key

• Results sent to the output

buffer

• Output is encrypted

0x09

0x00 00

X component of

public key

Y component of

public key

• Results stored in TempKey

• Output is available for other

operations but is not directly

accessible.

0x05

0x00 0[Slot] X component of

public key

Y component of

public key

• Results stored in specified

slot

Note:

When the ChipOptions.ECDHPROT value is 1, then the output of the ECDH command will be encrypted in this

mode. For the ATECC608A-TNGLoRaWAN the ECDHPROT field is set to 0 and encryption will be dependent

upon the mode of the ECDH command.

Table 5-41. Output Response ECDH TempKey

Name

Mode

Size

Description

Response

0x0D or 0x0F

1 byte

Error code if command fails

Response

0x0D

32 bytes

Shared Master Secret as clear text

Response

OutNonce

0x0F

32 bytes

Shared Master Secret as encrypted text

nonce used for encryption

Response

0x05 or 0x09

1 byte

0x00 if successful, otherwise an error code is returned

ATECC608A-TNGLoRaWAN

Device Commands

Complete Datasheet

DS40002154B-page 40

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