Add Lean (Aeneas) extraction of the crypto core - #3
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A third extraction lane alongside F* and ProVerif: a functional-model lifting of the SD-APKE / SD-PKE / Ed25519 crypto core to Lean 4 via the hax aeneas-lean backend (rustc -> charon -> aeneas). - proofs/proverif/hax.py `extract-lean`: runs `cargo hax into aeneas-lean` over the crypto-core `--start-from` set (mirrors the ProVerif targets), injecting a dev hax-lib (pending cryspen/hax#2069 + #2071) via a temporary [patch.crates-io] and restoring Cargo.toml/lock afterwards. - Source: aeneas can't yet translate the `&'static` domain tags, `tagged_preimage`, or the `decrypt_with_sender` trial-decrypt loop, so these are made opaque for the Lean backend only via `#[cfg_attr(hax_backend_lean, hax_lib::opaque)]` — F* and normal builds are unaffected (verified with `cargo check`). `cfg(hax_backend_lean)` added to the workspace check-cfg allowlist. - Snapshot of the generated Lean committed under proofs/aeneas-lean/ (llbc/ and the aeneas error log git-ignored); see its README for the toolchain pins and the upstream aeneas limitations (AeneasVerif/aeneas#392, #464). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Adds a Lean 4 (Aeneas) extraction of the crypto core, alongside the existing F* and ProVerif lanes — a third, independent lifting of the same Rust via the hax
aeneas-leanbackend (rustc → charon → aeneas).What extracts
The driver mirrors the ProVerif target set. Translated to Lean
defs:message::auth_enc/auth_dec(SD-APKE),metadata::encrypt/decrypt(SD-PKE)sign::sign/verify(Ed25519),encrypt_decrypt::encrypt/decrypt~5k lines of Lean, committed as a snapshot under
proofs/aeneas-lean/.Opaque for the Lean backend only
Aeneas can't yet translate a few constructs, so they're made opaque for the Lean backend only, via
#[cfg_attr(hax_backend_lean, hax_lib::opaque)]— F* and normal builds are unaffected (cargo checkclean):DomainTag::tag&'static [u8]→ "no bottoms in the value"tagged_preimageVecopsdecrypt_with_senderVec<&MessageKeyBundle>Running
Injects the dev hax-lib via a temporary
[patch.crates-io](restored afterwards), so the committed manifest stays on crates.iohax-lib 0.3.7.Depends on (upstream, not yet merged)
Both are injected at extraction time; nothing here changes the F*/ProVerif lanes or normal builds:
into aeneas-leansets target-side--cfg haxsocfg(hax)-gated deps (libcrux) compile under charon.hax_lib::opaque/excludeemit charon's native attributes, enabling thehax_backend_leanmarkers above.Stacked on #2 (ProVerif lane) since it extends the shared
proofs/proverif/hax.py. Seeproofs/aeneas-lean/README.mdfor details.