make coral-tunnel hardening; FINDINGS 6 wording; deterministic lopt sign#48
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- Makefile coral-tunnel: -4 forces IPv4 (host's IPv6 to coral times out in this network), ServerAliveInterval keeps the tunnel from silently dying on idle, ExitOnForwardFailure fails fast instead of leaving a stale tunnel. - FINDINGS entry 6: replace "closed line of investigation" with the honest split — the architectural-fix arc is closed (built and measured), the optimization arc on the Coral-side per-step bookkeeping is open and unattempted (C/Cython rewrite of the Boltzmann selection, on-device softmax fused with the matmul). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
ML-DSA in pqcrypto's PQClean is hedged (fresh OS randomness per sign,
two signs of the same (sk, message) differ). For callers that need
bit-reproducible signatures — auditability, regression tests,
content-addressed signed artifacts — add a liboqs backend that drives
liboqs's RNG callback with a SHAKE-256 DRBG seeded from --sign-seed-hex.
This uses the documented OQS_randombytes_custom_algorithm C extension
point that liboqs provides explicitly for callers needing a custom
RNG; the binding lives in lopt/_liboqs_rng.py (the same one keygen
already uses). FIPS 204 deterministic mode by construction.
Wire-format compatibility: liboqs-produced signatures verify against
pqcrypto's verify and vice versa (both implement the same standard).
lopt sign --algo ml-dsa-65 --sk-hex $SK --message-file msg \\
--backend liboqs --sign-seed-hex $(lopt seed sign-1 --n-bytes 64)
# same invocation, same bytes out. Pipe to a content-hash, ship.
Default backend stays pqcrypto (no extra C dep). --backend liboqs
errors loudly if liboqs-python or the liboqs shared library isn't
installed; users opt into the heavier dep deliberately.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
wock9000
changed the title
The auto-installer in liboqs-python 0.14.1 pins a non-existent upstream tag; the brew bottle is static-only. Source-build is currently the only working path on macOS. Documented end-to-end with the OQS_INSTALL_PATH knob, plus an explicit "what you get" table that now covers signing reproducibility per backend, not just keygen. Upstream tracking: liboqs-python issue #133 (already open). Comment posted with the concrete failure mode + macOS workaround. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
Three follow-ups, all under-the-hood (no headline numbers change):
make coral-tunnelhardening — pin-4(IPv4),ServerAliveInterval=30,ExitOnForwardFailure=yes. Saw the tunnel die silently twice during PR V3 throughput bench + FINDINGS entry 5: network bottleneck retires planned experiment #47 work; this stops it.lopt sign --backend liboqs— deterministic FIPS 204 signatures via the documentedOQS_randombytes_custom_algorithmextension point. Same(sk, message, sign-seed)→ bit-identical signature bytes; cross-backend interop with pqcrypto's verify confirmed.Determinism table (ML-DSA-65, end-to-end smoke test)
Test plan
make coral-tunnelworks with the new flags on this network (IPv6 was the bug)lopt signwithout--backendstill uses pqcrypto🤖 Generated with Claude Code