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v4.2.0: full (pure) post-quantum mode + critical dedup nonce fix

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Add a native full post-quantum encryption mode and fix a critical
keystream-reuse bug in deduplicated encrypted archives.

Full post-quantum mode (--pq-only)
- New envelope type 0x06 (ZUPT_ENC_PQ_ONLY): ML-KEM-768 (FIPS 203) as
  the sole key-establishment mechanism, with no classical X25519
  component. Archive key = SHA3-512(ml_ss || ml_ct || "ZUPT-PQ-ONLY-v1").
- For compliance postures that require a single NIST-standardised PQ
  primitive with no classical KEM in the envelope (CNSA 2.0-style
  "PQ-only"). Hybrid --pq stays the recommended default; --pq-only has
  no classical fallback, so a break of ML-KEM-768 alone breaks it.
- keygen --pq-only / keygen --pub --pq-only (ZPQK magic, 1200B pub /
  3600B priv; not interchangeable with hybrid --pq keys). Wrong or
  tampered ciphertext is rejected via ML-KEM FO implicit rejection plus
  the HMAC-SHA256 Encrypt-then-MAC envelope. In-tree, default build.

Security (critical): AES-256-CTR keystream reuse under --dedup
- Dedup assigns block sequence 0 to every data block (the sentinel that
  keeps cross-file dedup references authenticating consistently). The
  per-block nonce was base_nonce XOR block_seq, so under --dedup every
  block collapsed to the same nonce, reusing the CTR keystream across
  distinct plaintexts (a many-time-pad). Each block now uses a fresh
  random 128-bit nonce stored in the block prefix and bound into the
  block MAC; block_seq is still bound as MAC AAD. Regression test:
  tests/test_dedup_nonce.sh. Re-encrypt any --dedup encrypted archives
  written by <= 4.1.0.

Other
- keygen --sdk / --box on a source-only build now fails with a clear
  message pointing to native --pq / --pq-only (or a WITH_SDK=1 build).
- Documentation: README, SECURITY, THREAT_MODEL, man page, CHANGELOG,
  and all packaging recipes updated for the new mode and the security
  fix; version bumped to 4.2.0. Wire format v1.6 unchanged (0x06 is
  additive).

Validation: make check 16/16, quick suite 11/11 (incl. PQ-only),
dedup-nonce regression (all block nonces distinct), cppcheck clean.
This commit is contained in:
Cristian Cezar Moisés 2026-07-09 21:15:14 -03:00
commit 124958aea9
24 changed files with 811 additions and 123 deletions
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12
packaging/rpm/vaptvupt.spec
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@ -20,7 +20,7 @@
# in the base.
Name: vaptvupt
Version: 4.1.0
Version: 4.2.0
Release: 1%{?dist}
Summary: Post-quantum backup compression utility (AES-256 + ML-KEM-768 + Argon2id, formerly Zupt)
@ -112,6 +112,16 @@ ln -sf libpqvaptvupt.so.0.6.0 %{buildroot}%{_libdir}/%{name}/libpqvaptvupt.so
%endif
%changelog
* Wed Jul 09 2026 Cristian Cezar Moisés <sac@securityops.co> - 4.2.0-1
- New native full (pure) post-quantum mode --pq-only: ML-KEM-768 as the
sole KEM, no classical X25519 (envelope 0x06). For "PQ-only" compliance
postures; hybrid --pq remains the recommended default. In-tree crypto.
- Security (critical): fixed AES-256-CTR keystream reuse under --dedup
(every block now uses a fresh random 128-bit nonce). Re-encrypt any
--dedup encrypted archives written by <= 4.1.0.
- Clearer keygen --sdk/--box guidance on source-only builds.
- Wire format v1.6 unchanged.
* Tue May 20 2025 Cristian Cezar Moisés <sac@securityops.co> - 2.4.4-1
- Initial Fedora/EPEL RPM package.
- Tracks upstream v2.4.4: distribution packaging release; archive