tests: use AES-GCM key generation

src/tests/test_encryption_checksum.py

@@ -3,7 +3,8 @@ import sys
 from pathlib import Path
 from tempfile import TemporaryDirectory
 
-from cryptography.fernet import Fernet
+import os
+import base64
 
 sys.path.append(str(Path(__file__).resolve().parents[1]))
 
@@ -14,7 +15,7 @@ from utils.checksum import verify_and_update_checksum
 def test_encryption_checksum_workflow():
     with TemporaryDirectory() as tmpdir:
         tmp_path = Path(tmpdir)
-        key = Fernet.generate_key()
+        key = base64.urlsafe_b64encode(os.urandom(32))
         manager = EncryptionManager(key, tmp_path)
 
         data = {"value": 1}