mrwulf
f544b64e95
Replicates dalek's apex with this fork's sha2-0.10 adaptation: the hash oracle is the single monomorphic sha512_hash3(R, A, m) call (no foreign types in its signature — the 0.10 Sha512 alias cannot be declared opaque), and extraction runs --no-default-features so the error path avoids boxed dyn-Error. - gen/CurveSig: the extracted verify glue, definitionally welded to the proven model (TypesExternal/FunsExternal import CurveField; every curve and scalar call is a certified definition). - Proofs/SigApexSpec.lean (unchanged from dalek): verify_loop_full (the 32-byte comparison = array equality; axiom cone exactly the standard three) and verify_accepts_iff — accept IFF compress([s]B - [k]A) = R byte-for-byte, SHA-512 opaque. - check.sh Phase 3b: the apex axiom cone is enforced to be EXACTLY [propext, Classical.choice, Quot.sound, ed25519.Signature, verifying.sha512_hash3, ed25519.Signature.to_bytes, signature.error.Error, signature.error.Error.new] - zero curve, scalar, or backend axioms. Full check.sh green: 17 standard certificates + the apex audit. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> |
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|---|---|---|
| verification | ||
| .gitignore | ||
| README.md | ||
| TRUSTED-BASE.md | ||
risc0-ed25519-verified
Formal verification of the ed25519 implementation in risc0/curve25519-dalek (RISC Zero fork, v4.1.3), built as a coherent proof pyramid in Lean 4 via the Charon/Aeneas transpilation pipeline:
┌──────────────────────────────┐
│ Signature (EdDSA verify) │ accepted ⇒ [8][S]B = [8]R + [8][k]A
├──────────────────────────────┤
│ Scalar arithmetic mod ℓ │ Scalar52 ops correct mod ℓ
├──────────────────────────────┤
│ Group law (twisted Edwards) │ point ops = complete addition law
├──────────────────────────────┤
│ Field 𝔽_p, p = 2²⁵⁵ − 19 │ FieldElement51 ops correct mod p
└──────────────────────────────┘
Every layer states its theorems about the actual Aeneas-transpiled Rust
code (never about a hand-written re-model), and every claim in the status
table below is backed by a compiled proof plus an axiom audit of the named
certificate. Files that do not compile under verification/check.sh are not
in this repository.
Layer status
| Layer | Certificate | Status | Axioms of certificate |
|---|---|---|---|
| Field 𝔽_p | fieldImplementation |
✅ proven | [propext, Classical.choice, Quot.sound] |
| Group law (Edwards) | edwardsImplementation |
✅ proven | [propext, Classical.choice, Quot.sound] |
| Scalar mod ℓ | scalarImplementation (add ✅ sub ✅ mul ✅) |
✅ proven | [propext, Classical.choice, Quot.sound] |
| Signature (EdDSA) | verifyEquation (planned) |
⏳ planned | — |
Status legend: ✅ proven & axiom-audited · ⏳ in progress · ❌ not started.
This table is updated only when verification/check.sh passes for the layer.
Source
- Upstream: risc0/curve25519-dalek, commit
385adda - Pinned/patched source: saymrwulf/risc0-curve25519-dalek-source, commit
2643444 - Patches: minimal Aeneas-compatibility only (documented in the source repo)
- Scope caveat: this verifies the fork's pure-Rust
serial/u64path. The RISC Zero zkVM accelerator/syscall path is different code and is NOT covered by these proofs.
Toolchain (pinned)
| Component | Version |
|---|---|
| Aeneas | bf13c42e |
| Charon | 9dd7f23c |
| Lean | v4.30.0-rc2 |
| OCaml | 5.3.0 |
Reproducing
source ~/aeneas-toolchain/env.sh
cd verification
./extract.sh # Rust → LLBC → Lean (regenerates gen/)
./check.sh # compiles EVERY shipped file + axiom-audits EVERY certificate
The scalar layer has its own pair of buttons:
./extract-scalar.sh # regenerates gen/CurveScalar (Scalar52 limb arithmetic)
./check-scalar.sh # compiles the scalar gen + the proven scalar foundation
Trusted base
See TRUSTED-BASE.md for the complete list of assumptions (Lean kernel, mathlib, Charon/Aeneas semantics, external-function models, and — in the signature layer only — an opaque SHA-512 model).