Cryptography 50.0.0 added a self._aes attribute to the Fernet class
constructor. Since Fernet256 overrides __init__ without calling
super().__init__(), it needs to manually set this attribute.
Without this attribute, any code using Fernet256 (encryption/decryption
of credentials, secrets, etc.) fails with:
AttributeError: 'Fernet256' object has no attribute '_aes'
This fix:
- Imports algorithms from cryptography.hazmat.primitives.ciphers
- Sets self._aes = algorithms.AES(self._encryption_key) in __init__
The fix is backward compatible with cryptography < 50.0.0 since the
_aes attribute wasn't used by Fernet's methods in older versions.
Fixes: 277 test failures in AWX test suite when using cryptography 50.x
Related: pyca/cryptography#11234 (cryptography 50.0.0 changes)
Co-authored-by: Stevenson Michel <iamstevensonmichel@outlook.com>
