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https://github.com/saymrwulf/risc0-ed25519-verified.git
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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>
69 lines
3.4 KiB
Text
69 lines
3.4 KiB
Text
/- ──────────────────────────────────────────────────────────────────────────────
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gen/CurveSig/FunsExternal.lean — external functions for the verify glue.
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TIER A/B — REAL DEFINITIONS (no axioms): importing CurveField.Funs makes
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the curve calls (compress, vartime_double_scalar_mul_basepoint,
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as_bytes, neg, from_bytes_mod_order, from_bytes_mod_order_wide) resolve to
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the PROVEN model's definitions by their fully-qualified names. The Result
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Try/FromResidual plumbing and the compressed_from_bytes constructor are
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given real definitions below.
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TIER C — THE DELIBERATE OPAQUE BOUNDARY (the only axioms):
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· verifying.sha512_hash3 — SHA-512 over r ‖ a ‖ m, one call
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· ed25519.Signature.to_bytes — the wire accessor of an opaque type
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· signature.error.Error.new — an opaque error value
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The apex certificate will carry EXACTLY these axioms beyond the standard
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three — the documented hash-oracle boundary.
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────────────────────────────────────────────────────────────────────────────── -/
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import Aeneas
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import CurveSig.TypesExternal
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import CurveField.Funs
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open Aeneas Aeneas.Std Result ControlFlow Error
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set_option linter.dupNamespace false
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set_option linter.hashCommand false
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set_option linter.unusedVariables false
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/-! ### Tier A/B: real definitions -/
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/-- `Try::branch` for `core::result::Result` — the `?` operator's dispatch. -/
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def core.result.Result.Insts.CoreOpsTry_traitTry.branch
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{T : Type} {E : Type} (r : core.result.Result T E) :
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Result (core.ops.control_flow.ControlFlow
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(core.result.Result core.convert.Infallible E) T) :=
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match r with
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| .Ok v => ok (.Continue v)
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| .Err e => ok (.Break (.Err e))
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/-- `FromResidual` for `core::result::Result` — the `?` operator's error
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conversion. The `Ok Infallible` branch is uninhabited. -/
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def core.result.Result.Insts.CoreOpsTry_traitFromResidualResultInfallibleE.from_residual
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(T : Type) {E : Type} {F : Type} (convertFromInst : core.convert.From F E)
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(r : core.result.Result core.convert.Infallible E) :
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Result (core.result.Result T F) :=
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match r with
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| .Ok v => nomatch v
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| .Err e => do
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let f ← convertFromInst.from_ e
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ok (.Err f)
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/-- The compressed-point constructor: `CompressedEdwardsY` is the 32-byte
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array synonym in the proven model. -/
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def signature.compressed_from_bytes
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(bytes : Array Std.U8 32#usize) :
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Result curve25519_dalek.edwards.CompressedEdwardsY :=
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ok bytes
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/-! ### Tier C: the deliberate opaque boundary -/
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/-- SHA-512 over r ‖ a ‖ m, as one call (this fork's sha2-0.10 stack; the
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signature carries no foreign types). OPAQUE BY DESIGN — the hash oracle. -/
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axiom verifying.sha512_hash3
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: Slice Std.U8 → Slice Std.U8 → Slice Std.U8 → Result (Array Std.U8 64#usize)
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/-- The wire signature's 64 bytes (R ‖ s). Opaque accessor of an opaque
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type — the verify spec is stated relative to its result. -/
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axiom ed25519.Signature.to_bytes
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: ed25519.Signature → Result (Array Std.U8 64#usize)
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/-- An opaque error value; the spec only distinguishes ok from err. -/
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axiom signature.error.Error.new : Result signature.error.Error
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