For a project I am trying to load and be able to use a certificate (that's already downloaded on the system, name known, der extention confirmed). To accomplish this I am trying to use cryptography (tried it differently but cryptography is a demand made externally).
What I have done so far is follow their own documentation. Namely this:
>>> from cryptography import x509
>>> cert = x509.load_der_x509_certificate(pem_data)
I have replaced pem_data with the name of the certificate. If I do this, then I get the following error:
TypeError: load_der_x509_certificate() takes exactly 2 arguments (1 given)
What I have also done to try and avoid this error is:
>>> from cryptography import x509
>>> cert = x509.load_der_x509_certificate(pem_data, backend=None)
However, then I get the following error:
AttributeError: 'NoneType' object has no attribute 'load_der_x509_certificate'
I suppose None not having a use isn't too surprising, but unfortunately I can not seem to find any indication of what backend I should use anywhere in their documentation. I tried googling it and I found something about Hazmat (cryptography.hazmat.backends.default_backend()) But this comes with warnings not to use it unless I'm sure and seems to be a method, not an actual backend.
Could someone indicate 1: why is this method not working with one argument given when their documentation explicitly states providing a backend is optional and/or 2: What backend can I use to solve the issue?