Félix Malfait ec57d3fe0f Fix flaky 2FA encryption test for AES-256-CBC wrong-key behavior (#18126)
## Summary

- Fixes a flaky test in `simple-secret-encryption.util.spec.ts` that
fails ~1 in 256 runs
- AES-256-CBC doesn't guarantee wrong-key decryption throws — PKCS7
padding validation is probabilistic. When padding accidentally looks
valid, decryption silently returns garbage instead of throwing.
- Changed the test to verify the correct security property: wrong-key
decryption must never return the original secret (both throw and garbage
are acceptable)
- Audited both production `decryptSecret` call sites in
`two-factor-authentication.service.ts` — they always use the correct
key, so end users are not affected

## Test plan

- [x] Test passes 5/5 consecutive runs locally
- [x] Lint passes


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Co-authored-by: Cursor <cursoragent@cursor.com>
2026-02-20 14:41:31 +01:00
2025-08-07 17:02:12 +02:00
2025-07-08 15:13:02 +02:00

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