mirror of
https://github.com/saymrwulf/fips205-slhdsa-verified.git
synced 2026-09-03 19:53:49 +00:00
81 lines
4.1 KiB
Bash
Executable file
81 lines
4.1 KiB
Bash
Executable file
#!/usr/bin/env bash
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# Regenerate the Lean model in gen/ from the pinned fips205 snapshot.
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#
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# SCOPE: the SLH-DSA verify path, parameter set SLH-DSA-SHA2-128s
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# roots: slh_verify(_internal), fors_pk_from_sig, ht_verify,
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# xmss_pk_from_sig, wots_pk_from_sig, chain
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# (sign/keygen are out of scope; the five verify-path hash oracles
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# (h_msg, f, h, t_l, t_len) are opaque — see TRUSTED-BASE.md.)
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#
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# Rust --charon--> SlhVerify.llbc --aeneas--> gen/SlhVerify/*.lean
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#
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# REPRODUCIBILITY (external review round 2, 2026-07-24): this script now
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# REFUSES to extract from a source tree that is not at the pinned commit or
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# is dirty (a wrong/uncommitted source would silently produce a different
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# model). The full pin set (source + charon + aeneas + lean + ocaml) is in
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# verification/PROVENANCE.json; re-running this against the pinned tree
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# reproduces gen/SlhVerify/{Types,Funs}.lean byte-identically.
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#
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# HISTORY (gate-0 finding, resolved 2026-07-22): upstream models the hash
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# family as `crate::hashers::Hashers`, a struct of plain function pointers,
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# which Aeneas cannot translate. The compat patch in fips205-source provides
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# the additive monomorphic verify_mono module whose hash suite is reached
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# through named free functions — this script roots there.
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#
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# Usage: ./extract.sh [PATH_TO_fips205-source]
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# (default: ~/GitClone/FormalVerification/sources/fips205-source)
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# Override the required commit only for a deliberate re-pin:
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# EXPECTED_SRC_COMMIT=<full-sha> ./extract.sh [PATH]
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set -euo pipefail
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HERE="$(cd "$(dirname "$0")" && pwd)"
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CRATE="${1:-$HOME/GitClone/FormalVerification/sources/fips205-source}"
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# The pinned source commit this repo's model + proofs were verified against.
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# Keep in lockstep with verification/PROVENANCE.json and the README snapshot.
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EXPECTED_SRC_COMMIT="${EXPECTED_SRC_COMMIT:-a3ce8e8644fe302019ed7ae271912333f1476de4}"
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# ── Provenance guard: refuse a wrong or dirty source tree (fail-closed) ──────
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[ -d "$CRATE/.git" ] || { echo "ERROR: '$CRATE' is not a git checkout of fips205-source." >&2; exit 2; }
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GOT_COMMIT="$(git -C "$CRATE" rev-parse HEAD)"
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if [ "$GOT_COMMIT" != "$EXPECTED_SRC_COMMIT" ]; then
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echo "ERROR: source is at ${GOT_COMMIT:0:12}, but this repo is pinned to" >&2
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echo " ${EXPECTED_SRC_COMMIT:0:12}. Check out the pin, or set" >&2
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echo " EXPECTED_SRC_COMMIT=<sha> for a deliberate re-pin." >&2
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exit 3
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fi
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if [ -n "$(git -C "$CRATE" status --porcelain)" ]; then
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echo "ERROR: source tree at '$CRATE' is dirty. Extraction must run against" >&2
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echo " a clean, committed tree so the model is reproducible." >&2
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git -C "$CRATE" status --porcelain | sed 's/^/ /' >&2
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exit 4
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fi
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echo "[0/2] provenance OK: fips205-source @ ${EXPECTED_SRC_COMMIT:0:12} (clean)"
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# Toolchain env is sourced only AFTER the provenance guard, so a party without
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# the aeneas toolchain still gets the clean exit-2/3/4 diagnostics above
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# (round-3 reviewer nit, 2026-07-24).
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source ~/aeneas-toolchain/env.sh
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echo "[1/2] charon: Rust -> LLBC (monomorphic SHA2-128s verify cone;"
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echo " crate::verify_mono::oracle is the opaque SHA-2 boundary)"
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cd "$CRATE"
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# Single extraction root: the monomorphic entry. The five hash primitives
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# are reached through crate::verify_mono::oracle, marked opaque here — this
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# is the deliberate SHA-2 trust boundary (documented in TRUSTED-BASE.md).
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# The generic Hashers fn-pointer path is NOT in this cone by construction.
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charon cargo --preset=aeneas \
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--start-from 'crate::verify_mono::slh_verify_128s' \
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--opaque 'crate::verify_mono::oracle' \
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--opaque 'sha2' --opaque 'sha3' --opaque 'zeroize' --opaque 'rand_core' \
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--hide-marker-traits \
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--dest-file "$HERE/SlhVerify.llbc" \
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-- --no-default-features --features slh_dsa_sha2_128s
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echo "[2/2] aeneas: LLBC -> Lean (split files, SlhVerify.* modules;"
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echo " hand-maintained TypesExternal.lean / FunsExternal.lean are"
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echo " NOT overwritten once they exist)"
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cd "$HERE"
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aeneas -backend lean -split-files -subdir SlhVerify -dest gen SlhVerify.llbc
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echo "Done. Now run ./check.sh (Phase 1: the regenerated model must type-check)."
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