1  Here is an example of how to perform AES-256 encryption and decryption in Python using the `cryptography` library:
 2  
 3  ```python
 4  from cryptography.fernet import Fernet
 5  from base64 import b64encode, b64decode
 6  import os
 7  
 8  class AesCipher:
 9      def __init__(self):
10          self.key = Fernet.generate_key()
11          self.cipher_suite = Fernet(self.key)
12  
13      def encrypt(self, data: bytes) -> str:
14          """Encrypts the given data using AES-256."""
15          encrypted = self.cipher_suite.encrypt(data)
16          return b64encode(encrypted).decode()
17