* Update annotation for key

* Update fernet.py

* Update fernet.py

* fix XTS less than one block length. fixes #5885

* make XTS test key happy

* start typing x509.base

* statically type x509.base

* typehint X509Backend interface

* typehint at least the X509Backend interface

* make _CertificateRevocationList/_CertificateSigningRequest actual subclasses of the interface (as done before for Certificate in f16bff2cb)

* tell mypy to ignore lines with deliberately wrong types

* signature_hash_algorithm always returns a hash algorithm (it's not optional)

* Revert "signature_hash_algorithm always returns a hash algorithm (it's not optional)"

This reverts commit f6a5b172b416f8ddea561203c0cf03b55e4ec50e.

* hash algorithm is actually optional

* fix import style

* typehint parsed_version to int, which it de facto always is

* minimize changes

* break import cycle with conditional imports

* ignore access to private members of openssl implementation

* reformat code with Black

* test check for missing public key

* typehint x509.base

* cast extension class

* don't use string in typecast

* use lists as default argument values (see #5904)

* restore import since this is now re-exported

* ignore linting errors

* empty commit to trigger github actions

* fix formatting issue

* add type alias for IP addresses

* Re-export module attributes in cryptography.x509.oid

Without exporting attributes via `__all__` mypy will consider typehints of
classes imported from `cryptography.x509.oid` as type Any. Example:

    from cryptography.x509.oid import ObjectIdentifier
    oid = ObjectIdentifier("1.2.3")  # Any, if we do not re-export

Note that while the canonical location of ObjectIdentifier is in
`crytography.x509`, it is imported many times from `crytography.x509.oid`
instead

* add return type annotiations to constructors

* overload GeneralNames.get_values_for_type

* overload all implementations

* make value property return the generic value

* typehint x509.Name

* also ignore overloaded functions

* backend typing for twofactor package and more otp work

* even more typing

* style fixes

* no generic typing for _get_backend

* remove unneeded typing