26743557153
98%

Ran 01 Jun 2026 08:22AM UTC

Jobs 1

Files 26

Run time 1min

Badge

Embed ▾

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

Build # 26743557153

Build Type

push

github

Committed by

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

Jobs

ID	Job ID	Ran	Files	Coverage
1	26743557153.1	01 Jun 2026 08:22AM UTC	26	98.31	GitHub Action Run

kaidokert / fixed-bigint-rs / 26743557153
98%

README BADGES
x

Markdown

Textile

RDoc

HTML

Rst

Jobs

Source Files on build 26743557153

kaidokert / fixed-bigint-rs / 26743557153 98%

README BADGES x

Markdown

Textile

RDoc

HTML

Rst

Jobs

Source Files on build 26743557153

kaidokert / fixed-bigint-rs / 26743557153
98%

README BADGES
x