fix: add _aes attribute to Fernet256 for cryptography>=50.0.0 compatibility

[mjohns91]

Issue Type

• Bug, Docs Fix or other nominal change

Summary

Fixes Fernet256 class to be compatible with cryptography>=50.0.0.

Problem

Cryptography 50.0.0 added a self._aes attribute to the Fernet class constructor. Since Fernet256 overrides __init__() without calling super().__init__(), it doesn't get this attribute.

This causes 277 test failures in the AWX test suite when using cryptography>=50.0.0:

AttributeError: 'Fernet256' object has no attribute '_aes'

The error occurs in any code path that uses Fernet256 for encryption/decryption (credentials, secrets, etc.).

Solution

This PR:

• Imports algorithms from cryptography.hazmat.primitives.ciphers
• Sets self._aes = algorithms.AES(self._encryption_key) in Fernet256.__init__()

Backward Compatibility

✅ This fix is backward compatible with cryptography < 50.0.0 because:

• The _aes attribute wasn't used by Fernet's methods in older versions
• Setting it doesn't break any existing functionality
• No changes to the public API

Testing

This fix resolves the 277 test failures when running AWX tests with cryptography==50.0.1.

Related

• Related to django-ansible-base PR that upgrades to cryptography 50.x for PQC support
• Cryptography 50.0.0 changelog: https://github.com/pyca/cryptography/blob/main/CHANGELOG.rst#v50-0-0

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: 4ba052b5-3b93-44d1-8701-4cf91dad5078

📥 Commits

Reviewing files that changed from the base of the PR and between 88faef6 and df2ecd0.

📒 Files selected for processing (1)

• awx/main/utils/encryption.py

Included review availability: Your plan provides up to 10 included reviews per hour; 9 remain after this review.

---

📝 Walkthrough

Walkthrough

Fernet256 now creates an AES instance from its encryption key. The change adds the required AES import and supports cryptography 50.0.0 and later.

Changes

Fernet256 compatibility

Layer / File(s)	Summary
Add AES initialization awx/main/utils/encryption.py	The module imports cryptography’s AES algorithm. Fernet256.__init__ creates and stores an AES instance from the encryption key.

Priority: ➖ Normal

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Bug fix

Merge Risk: ⚪ Minimal · up to 6a4f5

This change addresses the reported encryption and decryption compatibility failures without introducing a remaining merge-blocking risk.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 2 functions across 1 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding the _aes attribute for cryptography 50.0.0 and later compatibility.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests

---

_{Comment @coderabbitai help to get the list of available commands.}

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[aap-pde-ci-bot]

❌ Test Results - FAILED

Summary

Metric	Count
Total Tests	613
✅ Passed	559
❌ Failed	2
⚠️ Errors	2
⏭️ Skipped	50
⏱️ Duration	3006.19s

Pass Rate: 91.2%

❌ Failed Tests

Test	Class
test_constructed_inventory_basic_aggregation	opt.test-suite.tests.inventories.test_constructed_control_plane.TestConstructedInventoryControlPlane
test_constructed_inventory_basic_aggregation	opt.test-suite.tests.inventories.test_constructed_control_plane.TestConstructedInventoryControlPlane
test_jt_allows_to_set_timeout_when_prompt_is_enabled[0]	opt.test-suite.tests.prompts.test_prompts_timeout.TestPromptTimeout
test_jt_allows_to_set_timeout_when_prompt_is_enabled[0]	opt.test-suite.tests.prompts.test_prompts_timeout.TestPromptTimeout