Error when decrypting json file

[roninimous]

Hi everyone, I'm not sure if this is still an up to date project. I have successfully generated the Apple Airtag key and used it. So far, it's working great. However, when I want to decrypt the JSON data exported from the reports, I received "Internal Server Error" and I've tried reinstalling all of my environment dependencies. I still get the same error. I also asked ChatGPT for help but couldn't find a fix yet. I'm using Python 3.11.0.

I'll put the issue down here in case there's other people who had the same issue and found a fix to it so that I don't have to find a solution from scratch.

These are the errors on the console:

PS E:\Developer\FindMyFlipper\AirTagGeneration> python .\web_service.py
ERROR:    Exception in ASGI application
Traceback (most recent call last):
  File "E:\Developer\FindMyFlipper\AirTagGeneration\venv\Lib\site-packages\uvicorn\protocols\http\h11_impl.py", line 408, in run_asgi
    result = await app(  # type: ignore[func-returns-value]
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "E:\Developer\FindMyFlipper\AirTagGeneration\venv\Lib\site-packages\uvicorn\middleware\proxy_headers.py", line 84, in __call__
    return await self.app(scope, receive, send)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "E:\Developer\FindMyFlipper\AirTagGeneration\venv\Lib\site-packages\fastapi\applications.py", line 1106, in __call__
  File "E:\Developer\FindMyFlipper\AirTagGeneration\venv\Lib\site-packages\starlette\middleware\exceptions.py", line 68, in __call__
    await self.app(scope, receive, sender)
  File "E:\Developer\FindMyFlipper\AirTagGeneration\venv\Lib\site-packages\fastapi\middleware\asyncexitstack.py", line 20, in __call__
    raise e
  File "E:\Developer\FindMyFlipper\AirTagGeneration\venv\Lib\site-packages\fastapi\middleware\asyncexitstack.py", line 17, in __call__
    await self.app(scope, receive, send)
  File "E:\Developer\FindMyFlipper\AirTagGeneration\venv\Lib\site-packages\starlette\routing.py", line 718, in __call__
    await route.handle(scope, receive, send)
  File "E:\Developer\FindMyFlipper\AirTagGeneration\venv\Lib\site-packages\starlette\routing.py", line 276, in handle
    await self.app(scope, receive, send)
  File "E:\Developer\FindMyFlipper\AirTagGeneration\venv\Lib\site-packages\starlette\routing.py", line 66, in app
    response = await func(request)
               ^^^^^^^^^^^^^^^^^^^
  File "E:\Developer\FindMyFlipper\AirTagGeneration\venv\Lib\site-packages\fastapi\routing.py", line 274, in app
    raw_response = await run_endpoint_function(
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "E:\Developer\FindMyFlipper\AirTagGeneration\venv\Lib\site-packages\fastapi\routing.py", line 191, in run_endpoint_function
    return await dependant.call(**values)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "E:\Developer\FindMyFlipper\AirTagGeneration\web_service.py", line 292, in report_decryption    clear_text = decrypt_payload(report['payload'], key_dict[hash_key])
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "E:\Developer\FindMyFlipper\AirTagGeneration\web_service.py", line 126, in decrypt_payload
    eph_key = ec.EllipticCurvePublicKey.from_encoded_point(ec.SECP224R1(), data[5:62])
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "E:\Developer\FindMyFlipper\AirTagGeneration\venv\Lib\site-packages\cryptography\hazmat\primitives\asymmetric\ec.py", line 185, in from_encoded_point   
    return backend.load_elliptic_curve_public_bytes(curve, data)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "E:\Developer\FindMyFlipper\AirTagGeneration\venv\Lib\site-packages\cryptography\hazmat\backends\openssl\backend.py", line 1120, in load_elliptic_curve_public_bytes
    raise ValueError("Invalid public bytes for the given curve")
ValueError: Invalid public bytes for the given curve

I haven't tried changing the python version yet. But if it's the version compatibility, I will change it. Hopefully, this is an easy fix.

Thanks

[roninimous]

I've been trying to find the solution for days. Right after I posted this in the discussion, I have one final thought which is to check the pull request. AND THERE GOES THE ANSWER. @ArtemKiyashko has submitted a pull request to fix this issue and refactored the code 2 months ago but it hasn't been merged.

If anyone is having the same issue, feel free to go to his forked version and clone the solution.