2 commits

Author	SHA1	Message	Date
mrwulf	a377ffc587	Signature layer, first bricks: canonicity closure + hash-to-scalar foundation ... Canonicity pass (the layer is now closed under its own preconditions): - sub_val_spec post carries the exact value equation (exists beta <= 1, scVal r + scVal b = scVal a + ell*beta, with the underflow guard beta = 1 -> scVal a < scVal b) - add/montgomery_reduce/mul/aggregate posts all carry scVal r < ell: canonical inputs give canonical outputs everywhere. Needed because from_bytes_wide (hash-to-scalar) feeds Montgomery outputs into add. Hash-to-scalar foundation (toward Scalar::from_hash / EdDSA verify): - extraction scope + from_bytes_wide (brings constants::R); regenerated gen - source repos carry a documented Aeneas-compat patch: the bare `hi[4] = words[7] >> 20` extracts ill-typed at pin bf13c42e; masked (semantic no-op, words[7] >> 20 < 2^44) - Proofs/ScalarWideSpec.lean: R constant lemmas (R = 2^260 mod ell, witness 2^260 = R + 255*ell) and montgomery_mul_spec, the single Montgomery round: [r]*2^260 = [a]*[b], canonical bounded output check-scalar.sh: 10 proof files, 11 kernel audits, all exactly [propext, Classical.choice, Quot.sound]. Button pressed fresh: green.	2026-07-03 23:18:34 +02:00
mrwulf	1bbc70e5ce	Scalar layer complete: Montgomery reduction + full mul ported, scalarImplementation aggregate ... Port of the dalek Montgomery stack against THIS fork's own extraction (gen sections byte-identical, proofs recompiled from scratch here): - Proofs/ScalarMulSpec.lean - mul_internal: 9 exact schoolbook columns - Proofs/ScalarMontSpec.lean - part1/part2 exact-division rounds (LFACTOR*L0 = -1 mod 2^52), head/tail telescopes, mont_bound, tail walk - Proofs/ScalarReduceSpec.lean - montgomery_reduce main walk: scDenote r * 2^260 = Z in ZMod ell + 52-bit output bounds - Proofs/ScalarFullMulSpec.lean - mul = double Montgomery round through RR = R^2 mod ell; R cancelled as a unit; post: [mul a b] = [a]*[b] - Proofs/ScalarMain.lean - scalarImplementation aggregate (ScBnd interfaces; canonical inputs discharge the Montgomery bound) sub_val_spec/add_val_spec posts strengthened with result-limb bounds. check-scalar.sh: 9 proof files, 10 kernel audits, all exactly [propext, Classical.choice, Quot.sound]. Button pressed fresh: green.	2026-07-03 21:46:57 +02:00