dmazzella / ucryptoauthlib

Lightweight driver for Microchip's Crypto Authentication secure elements written in pure python for micropython

life is short, use python! 🐍

ucryptoauthlib's Issues

RP2 ARDUINO_NANO_RP2040_CONNECT

Hello Damiano,

i tried to compile your lib for RP2 ARDUINO_NANO_RP2040_CONNECT.
These are my commands:

$ git clone https://github.com/micropython/micropython.git
$ cd micropython
micropython$ git submodule update --init
micropython$ git clone https://github.com/dmazzella/ucryptoauthlib.git micropython-lib/ucryptoauthlib
micropython$ make -C mpy-cross && make -C ports/rp2 BOARD=ARDUINO_NANO_RP2040_CONNECT FROZEN_MANIFEST="$(pwd)/micropython-lib/ucryptoauthlib/manifest.py""

After flashing the rp2040 with the uf2 image, and the following command:

device = ATECCX08A()

i got this error

  File "<stdin>", line 1, in <module>
  File "cryptoauthlib/device.py", line 30, in __init__
NoDevicesFoundError: For protocols that support device discovery (kit protocol), no devices were
found

Do you have an idea how I can fix the device detection for the arduino rp2040 https://docs.arduino.cc/hardware/nano-rp2040-connect ?

Kind regards,
Matt

Some questions on implementing the atcab_read_enc function

I have started trying to implement the atcab_read_enc() function.

This function relies on the atcab_gendig() function which I notice in code appears to be implemented, but the readme does not have a tick next to it. What is the current state of the atcab_gendig() function?

I am using as a guide the datasheets including "Atmel CryptoAuthentication Encrypted Reads and Writes" and the Atmel C++ library, but just wonder if you have any advise for me?

thanks,
Chris

Error in constructor of ATECCX08A

I am building Micropython for ESP32 as per the instructions https://github.com/micropython/micropython/tree/master/ports/esp32, having first copied the files in modules/cryptoauthlib to the modules/cryptoauthlib in the esp32 directory. This builds successfully and I can see it compiling the cryptoauthlib files. I then deployed this and attempt to test that the device is working. I confirmed that its visible on I2C bus with

from machine import Pin, I2C

scl = Pin(5)
sda = Pin(18)
i2c = I2C(-1, scl, sda)
print(i2c.scan())

which gave 96, which is correct. I then tried to initialize the device with:

from cryptoauthlib.device import ATECCX08A
from machine import Pin, I2C

device = ATECCX08A(bus=I2C(-1, Pin(5), Pin(18), freq=133000))

but this fails with:

Traceback (most recent call last):
  File "<stdin>", line 4, in <module>
  File "cryptoauthlib/device.py", line 36, in __init__
  File "cryptoauthlib/packet.py", line 59, in __getitem__
IndexError: memoryview index out of range

I actually have your library working correctly on another esp32 and device, but unfortunately I did not keep a copy of this binary. I have the swapped the devices between the esp32's and they both work correctly with my first esp32. I have tried this new binary on two different esp32's and it gives the same error on both.

Any suggests on how to fix this? Thx

Chris

Using ucryptoauthlib with CPython

I happen to find myself in a situation where I need to interface with the ATECC508A on a Raspberry Pi. Python is my prefered language, so when I found ucryptoauthlib, I thought it was perfect until I realised it was for MicroPython, not for Python (CPython).

I've mucked about to the point that I've got everything to import / run correctly except for trying to actually initialize the device. CPython kinda craps out when it goes looking for the machine library and doesn't find it. I can't find any kind of analog or drop in replacement, even micropython-cpython-machine doesn't seem to satisfy.

Do you have any idea what would need to be done to "port" ucryptoauthlib to run correctly under CPython instead of MicroPython?