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Ran 01 Jun 2026 08:22AM UTC

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Committed 01 Jun 2026 08:22AM UTC coverage: 98.315%. Remained the same

Job # 26743557153.1

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push

github

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web-flow

Commit Message

Apply black_box to Ct per-limb select (#118)

* Apply black_box to Ct per-limb select

LLVM recognizes `a ^ (mask & (a ^ b))` == `if mask == 0 { a } else
{ b }` and on some targets rewrites the loop into a `csel` of the
source ADDRESS followed by a load — branch-free, but a load from
a secret-selected address (cache-timing leak).

Opacifying the choice with `core::hint::black_box` at the source
of the mask defeats the rewrite. Same protection `subtle`'s
`Choice::from(u8)` provides internally; applied directly because
`Choice::from` is not `const fn` and would break the `c0nst` macro
chain these primitives use for compile-time evaluation.

* Bump crate MSRV to 1.86

`core::hint::black_box` is `const` since 1.86; the previous commit
added calls inside `c0nst fn` paths, so the declared MSRV needs to
move with it. Also bumps the matching toolchain pins in both CI
workflows, the ct-driver `TargetSpec` table, and the README badge.

Coverage Stats

2859 of 2908 relevant lines covered (98.31%)

367.35 hits per line

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