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thePR0M3TH3ANandClaude Fable 5
0f8ce35c47
Fixtures show both implementations compute the same values. This adds the
missing half: proof they can read each other's on-disk profiles and
backups, using each side's real code paths.
scripts/cross_impl_check.py (12 checks, wired into CI):
A. Python creates a profile -> TS opens the index, derives every secret
identically, and unlocks it with the master password alone
B. TS creates a profile -> Python decrypts parent_seed.enc and the index,
recovers the same seed, derives the same secrets
C. Portable backups round-trip both directions (Python verifies the
checksum of a TS-written export)
D. Both implementations reject a bad-checksum mnemonic
Two real compatibility bugs it caught, both fixed:
- TS-created profiles were unopenable by Python. Python only honors the
recorded parent-seed KDF parameters when kdf.name is exactly "pbkdf2";
TS wrote "pbkdf2-sha256" with an empty salt and 100k iterations, so
Python fell back to its config defaults (200k, fingerprint salt) and
derived a different key. TS now writes exactly what
PasswordManager._build_seed_kdf_config does, and its own unlock path
honors the recorded salt and iteration count.
- TS accepted invalid BIP-39 mnemonics. Seed derivation takes any string,
so a typo'd phrase silently produced a *different* vault -- unopenable
by Python and unrecoverable by the user. Mnemonics are now validated
wherever they enter (profile creation and SEEDPASS_MNEMONIC), with an
error that says why it matters.
Also: docs/typescript_cutover_plan.md records the gate list for promoting
TS to main and retiring Python to legacy/reference -- P0 gates 1-4 are
green, 5-7 (feature parity tail, packaging, migration/rollback) are not.
The Python tree stays in CI after cutover as the compatibility oracle.
Regression tests for both bugs. 151 core + 46 CLI tests green,
12/12 cross-implementation checks green.
Co-Authored-By: Claude Fable 5 <[email protected]>