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curve: use subtle::Choice for constant-time fixes #665

Merged
merged 1 commit into from
Jul 17, 2024
Merged

curve: use subtle::Choice for constant-time fixes #665

merged 1 commit into from
Jul 17, 2024

Commits on Jun 25, 2024

  1. curve: use subtle::Choice for constant-time fixes 

    Alternative to #659/#661 and #662 which leverages `subtle::Choice` and
`subtle::ConditionallySelectable` as the optimization barriers.

Really the previous masking was there to conditionally add the scalar
field modulus on underflow, so instead of that, we can conditionally
select zero or the modulus using a `Choice` constructed from the
underflow bit.
    @tarcieri
    tarcieri committed Jun 25, 2024
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