test: handle gnark-crypto not returning malleable signatures anymore

[ivokub]

Description

In Consensys/gnark-crypto#725 gnark-crypto prevents returning ECDSA signatures with large s (>(mod-1)/2), but we're testing the mismatch case in the precompile tests here.

Handle it manually now and explicitly create large s in tests.

This PR currently depends on a gnark-crypto branch as the change isn't merged yet. When corresponding gnark-crypto PR is merged then also should update dependency here to gnark-crypto@master.

Type of change

• Bug fix (non-breaking change which fixes an issue)

How has this been tested?

• TestECRecoverCircuitShortMismatch

Checklist:

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• I did not modify files generated from templates
• golangci-lint does not output errors locally
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

---

Note

Refactors ECRecover tests to manually create large-s signatures and updates cases accordingly; also bumps gnark-crypto dependency.

• Tests:
  • ECRecover (std/evmprecompiles/01-ecrecover_test.go):
    • Refactor testRoutineECRecover to accept forceLargeS and manually create large-s signatures by s = modulus - s and flipping v.
    • Update strict/lax and mismatch tests to use the new helper; add a second valid assignment in the full test; extend failure-tag checks to large-s.
  • ECDSA secpR tests (std/signature/ecdsa/ecdsa_secpr_test.go): remove benchmark code and related imports.
• Dependencies:
  • Bump github.com/consensys/gnark-crypto to v0.19.3-0.20251114115201-b301c0c81f19 in go.mod/go.sum.

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[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	github.com/​consensys/​gnark-crypto@​v0.19.3-0.20251114101102-c7c3213680f8 ⏵ v0.19.3-0.20251114115201-b301c0c81f19	+1

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