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https://github.com/saymrwulf/betrusted-ed25519-verified.git
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mrwulf
6120f9bb17
Transpile the Scalar52 limb backend (backend::serial::u64::scalar
add/sub/mul/square/montgomery_*) from Rust to Lean via Charon/Aeneas,
scoped at the function level to the iterator-free arithmetic core.
- verification/extract-scalar.sh: function-level Charon/Aeneas extraction
- verification/gen/CurveScalar/{Types,Funs}.lean: transpiled model (27 defs).
This fork (v4.1.2) implements Scalar52::sub's constant-time conditional add
with a pure arithmetic mask (constants::L[i] & underflow_mask), so the
extraction pulls in NO external functions or types (unlike v5 dalek, which
routes sub through subtle, and v4.1.3, which uses a local black_box).
- verification/gen/CurveScalar/{TypesExternal,FunsExternal}.lean: decl-free
stub modules kept so the check manifest is uniform across forks.
- verification/Proofs/ScalarDenote.lean: semantic foundation — Scalar52
denotation into ℤ/ℓℤ, limb-bound invariant, and L_val (the transpiled
constants::L denotes exactly the group order ℓ, kernel-checked).
- verification/check-scalar.sh: guarded compile of the gen modules plus the
denotation foundation.
check-scalar.sh passes: gen compiles; denotation + L = ℓ proven.
add/sub/mul remain in progress.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
33 lines
1.7 KiB
Bash
Executable file
33 lines
1.7 KiB
Bash
Executable file
#!/usr/bin/env bash
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# Regenerate the SCALAR-layer Lean model (gen/CurveScalar) from Rust.
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#
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# SCOPE: the Scalar52 limb backend (backend::serial::u64::scalar) — the
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# iterator-free ARITHMETIC core: add/sub/mul/square/montgomery_reduce/
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# from_bytes/to_bytes mod ℓ = 2²⁵² + 27742317777372353535851937790883648493.
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# The high-level crate::scalar wrapper (Sum/Product/NAF/radix/byte-parsing,
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# all iterator-heavy) is brought in only for the signature layer.
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set -euo pipefail
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source ~/aeneas-toolchain/env.sh
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HERE="$(cd "$(dirname "$0")" && pwd)"
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CRATE=~/GitClone/FormalVerification/sources/betrusted-curve25519-dalek-source/curve25519-dalek
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echo "[1/2] charon: Rust -> LLBC (scalar + Scalar52)"
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cd "$CRATE"
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charon cargo --preset=aeneas \
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--start-from 'crate::backend::serial::u64::scalar::_::add' \
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--start-from 'crate::backend::serial::u64::scalar::_::sub' \
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--start-from 'crate::backend::serial::u64::scalar::_::mul' \
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--start-from 'crate::backend::serial::u64::scalar::_::square' \
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--start-from 'crate::backend::serial::u64::scalar::_::montgomery_mul' \
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--start-from 'crate::backend::serial::u64::scalar::_::montgomery_square' \
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--start-from 'crate::backend::serial::u64::scalar::_::montgomery_reduce' \
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--start-from 'crate::backend::serial::u64::scalar::_::montgomery_invert' \
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--start-from 'crate::backend::serial::u64::scalar::_::as_montgomery' \
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--start-from 'crate::backend::serial::u64::scalar::_::from_montgomery' \
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--dest-file "$HERE/CurveScalar.llbc" \
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-- --no-default-features
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echo "[2/2] aeneas: LLBC -> Lean (split files, CurveScalar.* modules)"
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cd "$HERE"
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aeneas -backend lean -split-files -subdir CurveScalar -dest gen CurveScalar.llbc
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echo "Done."
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