perf(zkatdlog): optimize IPA prover using native gnark-crypto arithmetic

[SurbhiAgarwal1]

Description

This PR introduces native gnark-crypto field arithmetic for the Inner Product Argument (IPA) prover to eliminate the allocation overhead of the generic mathlib wrapper in tight reduction loops. Supersedes #1912.

As discussed in #1432 and the parent performance epic (#954), the core curve layer heavily relies on mathlib interface allocations, which becomes a bottleneck during Bulletproof/IPA proof generation.

Changes Made

• Native IPA Execution: Created ipa_native.go containing nativeIPAReduce to execute round reductions natively.
• Dynamic Curve Dispatch: Updated ipaProver.reduce to dynamically dispatch execution based on the underlying curve via math.DispatchCurve (BLS12-381 and BN254).
• In-Place Generic Arithmetic: Converted vectors into gnark-crypto native array types (math.GnarkFr[T]) for in-place scalar computations.

Related Issues

• Supersedes Perf/zkp ipa optimization #1912
• Fixes Optimize ZKP Computation Using CPU SIMD and Specialized Instructions #1432
• Part of Epic [EPIC] Performance Improvements #954

Type of Change

• Performance Improvement (optimizing code execution and memory allocations)

Testing Done

• Unit tests passed (make unit-tests)
• Verified against all bit-lengths and tampering test cases.

[SurbhiAgarwal1]

Hi @adecaro and @AkramBitar ,

I have updated the PR branch (perf/zkp-ipa-optimization) to resolve the CI build and check failures:

1. Fixed Module Import Paths: Updated imports in token/core/zkatdlog/nogh/v1/crypto/rp/bulletproof/ from legacy github.com/hyperledger-labs/fabric-token-sdk to github.com/LFDT-Panurus/panurus matching go.mod.
2. Code Formatting: Applied gofmt -s -w across all modified files in bulletproof to resolve the make checks formatting failure.
3. Verification:
   • All unit tests in token/core/zkatdlog/nogh/v1/crypto/rp/bulletproof pass locally (go test ./... PASS).
   • cgo-check builds (tokengen, artifactgen) compile with CGO_ENABLED=0.
   • DCO sign-off is included in the commit.

Could you please trigger/re-run the CI workflows and let me know if any further changes are needed? Thanks!

[AkramBitar]

@SurbhiAgarwal1

Thanks a lot for submitting this PR!
I also want to apologize in advance if it takes me some time to review it. I'll get to it as soon as possible.

Regards,
Akram

[AkramBitar]

@neetance

Could you please help to review this PR?

Thanks a lot,
Akram