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impl ConditionallySelectable for Field

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Jack Grigg
2019-12-12 23:15:48 +00:00
parent cded08b0c5
commit 662be3551f
12 changed files with 74 additions and 0 deletions
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10
ff/ff_derive/src/lib.rs
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@@ -833,6 +833,16 @@ fn prime_field_impl(
}
}
impl ::subtle::ConditionallySelectable for #name {
fn conditional_select(a: &#name, b: &#name, choice: ::subtle::Choice) -> #name {
let mut res = [0u64; #limbs];
for i in 0..#limbs {
res[i] = u64::conditional_select(&(a.0).0[i], &(b.0).0[i], choice);
}
#name(#repr(res))
}
}
impl ::std::ops::Neg for #name {
type Output = #name;