crypto: Restrict conjugate() to degree-2 extension fields#1485
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The conjugate operation (negating the second coefficient) is only mathematically correct for degree-2 extensions. Add a requires clause to prevent misuse on degree-3+ types where it would produce incorrect results silently.
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Pull request overview
This PR prevents mathematically incorrect use of ExtFieldElem::conjugate() by restricting it to quadratic (degree-2) extension fields, where conjugation is defined as negating the second coefficient.
Changes:
- Add a C++20
requires(DEGREE == 2)constraint toExtFieldElem::conjugate(). - Simplify the conjugation implementation to directly return
(a, -b)for degree-2 elements. - Update the doc comment to explicitly document the degree-2 semantics.
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## master #1485 +/- ##
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- Coverage 96.74% 96.74% -0.01%
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Files 156 156
Lines 14166 14163 -3
Branches 3337 3336 -1
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- Hits 13705 13702 -3
Misses 317 317
Partials 144 144
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rodiazet
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Apr 14, 2026
somnergy
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May 23, 2026
Merges upstream evmone (ipsilon/evmone) master through commit ff942e2 into zevmone main. Brings in the post-EVMC-vendoring upstream commits: - evmone 0.20.0 and 0.21.0 releases - EVMC vendoring follow-ups: remove loader library and old evmc tool (ipsilon#1504), drop external EVMC support in evmone-bench (ipsilon#1503), add standalone evmone CLI tool (ipsilon#1502), bump CMake to 3.22 (ipsilon#1501), remove redundant build configuration (ipsilon#1505) - Add Amsterdam EVM revision (ipsilon#1508) - Implement DUPN/SWAPN/EXCHANGE EIP-8024 (ipsilon#1429) - Extract SWAP instruction helper (ipsilon#1509) - Restrict conjugate() to degree-2 extension fields (ipsilon#1485) - Add missing inline keyword to always_inline functions (ipsilon#1510) - CI updates: run EEST develop (ipsilon#1507), drop legacy state tests (ipsilon#1512), set LLVM_PROFILE_FILE per run (ipsilon#1513) Conflict resolution (matches the existing merge-upstream branch): - Adopt upstream's parameterized run_execution_spec_tests command and upstream-style call sites (release/fixtures_suffix/filter); drop the duplicate non-parameterized definition merged in from HEAD - circle.yml gcc-min job: rename CMAKE_OPTIONS=-DEVMC_TOOLS=OFF to -DEVMONE_TOOLS=OFF (option moved to evmone scope after vendoring) - .bumpversion.cfg, CHANGELOG.md, CMakeLists.txt: take upstream - evmc/* (add/add): take upstream's vendored EVMC tree - lib/evmone_precompiles/ecc.hpp: keep test_bit() helper (not yet in upstream intx) - lib/evmone_precompiles/modexp.cpp: keep SP1 modexp_sp1() function and its dispatch alongside upstream's bump-allocator refactor - test/integration/CMakeLists.txt: take upstream
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The conjugate operation (negating the second coefficient) is only mathematically correct for degree-2 extensions. Add a requires clause to prevent misuse on degree-3+ types where it would produce incorrect results silently.