feat: add Goldilocks backend + two-field differential fixtures#460
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feat: add Goldilocks backend + two-field differential fixtures#460BornPsych wants to merge 9 commits into
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Rebased onto PR #460 head (dual-commit + LogUp/multi-challenge fixtures). The base-field split breaks the challenge-bearing fixtures: they place ext challenge values in the witness, which a base witness can't hold (that needs the k-base LogUp construction, plan T12). Resolution: - GoldilocksField = Basefield<Field64_3> stays the canonical field (the real target); GoldilocksEfField = Identity<Field64_3> is an explicitly-TEMPORARY crutch, to be deleted once T12 lets challenge fixtures run on base. - Split the suite macros: roundtrip_suite!/soundness_suite! keep the base-compatible tests (run on GoldilocksField); new challenge_roundtrip_suite!/ challenge_soundness_suite! hold the LogUp/multi-challenge tests (run on GoldilocksEfField for goldilocks, Bn254Field for bn254). All fixtures green: goldilocks base suite on BaseField + challenge suite on Identity, bn254 full set. The planning signal for the frontend work: the LogUp/ dual-commit fixtures need T12 (base challenges, k=3 parallel repetition) to run under the real base-field target.
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Summary
Adds
provekit-backend-goldilocks, a second backend that instantiates the field-generic spine over the ~192-bit Goldilocks cubic extensionField64_3, and restructuresprovekit-fixturesso the prove→verify and soundness suites run over both bn254 and goldilocks from shared, field-generic test bodies. bn254 is unchanged.This is the backend half of the field-generic work: #458/#459 made the spine generic over
<P: ProofField>and added the scheme builder + fixtures; this PR shows a second, structurally different field plugs in with no spine edits.Why
The spine was made field-generic precisely so a non-bn254 field could be added as a backend crate plus an instantiation, with no changes to
common/prover/verifier. Goldilocks is the validation field: a 64-bit prime whose cubic extensionField64_3is large enough (~192 bits) to draw Fiat-Shamir challenges from. This PR is the proof that the seam holds — the backend is a marker type implementingProofField/FieldHashplus aregister()call, nothing more. (Pre-EF/BF the embedding isIdentity<Field64_3>, so base == ext for now; the base≠ext split lands once zkWHIR supports it.)What changed
provekit-backend-goldilocks(new):GoldilocksFieldwithEmbedding = Identity<Field64_3>; aFieldHashimpl with aSha256default hash, 24-byte little-endian canonical bytes, digest-spread hashing, and a transcript sponge;register()installs theField64_3NTT engine in whir's global registry. Mirrors theprovekit-backend-bn254layout.provekit-fixtures: the bn254-onlyroundtrip.rs/soundness.rsare replaced bytests/shared/mod.rs— field-generic<P: FieldHash>test bodies plusroundtrip_suite!/soundness_suite!macros — and four thin per-field instantiation files (bn254_*,goldilocks_*). The same assertions now run over both fields.Verification
cargo build --workspacegreen.provekit-fixtures: bn254 6 roundtrip + 4 soundness, goldilocks 6 roundtrip + 4 soundness — all pass; 2 benches ignored.provekit-backend-goldilocksunit tests (byte roundtrip) pass.Stacks on #459 (open); until that merges, the commit list above includes #459's commits — the Goldilocks-specific changes are the final 2 commits.