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Consider additional verification tooling to constant-time-ness of C code #1598

@mkannwischer

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@mkannwischer

Identified during the 2026 soundness review (#1582, SOUNDNESS.md).

Constant-time properties of the C code are currently tested empirically using valgrind across many compilers and optimization levels, and the C code uses value barriers to prevent harmful compiler optimizations. However, there is no formal verification of constant-time-ness for the C code.

Consider introducing additional verification tooling that allows us to express and verify constant-time properties for the C code.

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