copy.copy for private keys #11859
Description
Private keys (at least RSAPrivateKey) can not be copied in cryptography 43.0.3:
>>> import copy
>>> from cryptography.hazmat.primitives.asymmetric import rsa
>>> private_key = rsa.generate_private_key(
... public_exponent=65537,
... key_size=2048,
... )
>>> copied_key = copy.copy(private_key)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/Users/jocke/.pyenv/versions/3.11.7/lib/python3.11/copy.py", line 92, in copy
rv = reductor(4)
^^^^^^^^^^^
TypeError: cannot pickle 'cryptography.hazmat.bindings._rust.openssl.rsa.RSAPrivateKey' object
There was a similar issue for public keys reported in #9403 and it seems like the fix to that issue only made it possible to copy all the public keys, not any of the private ones.