MicroPython Forum (Archive)

Posted: **Wed Jan 23, 2019 10:02 am**

Hi folks,
at this link https://github.com/dmazzella/ucryptoauthlib I have created a driver in pure-python for interact with the Microchip's secure element ATECC508A and ATECC608A from a PyBoard.

The API are the same of the C library/driver from Microchip https://github.com/MicrochipTech/cryptoauthlib

Currently the following commands are supported:

INFO
LOCK
NONCE
RANDOM
READ (1)
SHA (1)
WRITE (1)
VERIFY (1)
GENKEY
SIGN

(1) Not all features are implemented

Do not hesitate to contact me for more info, problems or insults about it

Saluti,
Damiano

Posted: **Tue May 24, 2022 5:04 pm**

Hi Damiano,

Just taking my first tenative steps with your library using an Arduino Nano rp2040 connect board (contains the ATECC608A) ... atcab_random seems to return some decidedly unrandom data?

Code: Select all

import cryptoauthlib.device
import micropython
from ubinascii import hexlify

sda = machine.Pin(12)
scl = machine.Pin(13)
bus = machine.I2C(0, scl=scl, sda=sda, freq=133000)

device = cryptoauthlib.device.ATECCX08A(
    bus = bus, 
    address = cryptoauthlib.device.I2C_ADDRESS, 
    retries = cryptoauthlib.device.RX_RETRIES
)

for _ in range(10):
    print(hexlify(device.atcab_random().response_data ))

returns;

Code: Select all

b'23ffff0000ffff0000ffff0000ffff0000ffff0000ffff0000ffff0000ffff0000411a'
b'23ffff0000ffff0000ffff0000ffff0000ffff0000ffff0000ffff0000ffff0000411a'
etc.

Any ideas?

Other basic tests e.g. computing sha digests seem to be returning plausible data (although I haven't actually validated it yet).

Tim

Posted: **Mon May 30, 2022 7:28 pm**

Hi Tim,
sorry for late response ...

you haven’t configured the device, as reported in datasheet. see https://github.com/MicrochipTech/crypto ... issues/121

Regards,
D.

Posted: **Thu Jun 02, 2022 4:14 pm**

Hi Damiano,

Thanks! Some light reading to do then ;o)

Regards, Tim

MicroPython Forum (Archive)

ATECC508A and ATECC608A cryptoauthlib

ATECC508A and ATECC608A cryptoauthlib

Re: ATECC508A and ATECC608A cryptoauthlib

Re: ATECC508A and ATECC608A cryptoauthlib

Re: ATECC508A and ATECC608A cryptoauthlib