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fixup! Allow Options in the VartimeMultiscalarMul trait

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This commit is contained in:
Henry de Valence 2018-07-20 20:33:17 -07:00
parent 36ade94596
commit f675f4cd2b
1 changed files with 11 additions and 7 deletions
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18
src/backend/avx2/scalar_mul/straus.rs
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@ -72,21 +72,24 @@ impl MultiscalarMul for Straus {
impl VartimeMultiscalarMul for Straus {
type Point = EdwardsPoint;
fn vartime_multiscalar_mul<I, J>(scalars: I, points: J) -> EdwardsPoint
fn optional_multiscalar_mul<I, J>(scalars: I, points: J) -> Option<EdwardsPoint>
where
I: IntoIterator,
I::Item: Borrow<Scalar>,
J: IntoIterator,
J::Item: Borrow<EdwardsPoint>,
J: IntoIterator<Item = Option<EdwardsPoint>>,
{
let nafs: Vec<_> = scalars
.into_iter()
.map(|c| c.borrow().non_adjacent_form(5))
.collect();
let lookup_tables: Vec<_> = points
let lookup_tables: Vec<_> = match points
.into_iter()
.map(|point| NafLookupTable5::<CachedPoint>::from(point.borrow()))
.collect();
.map(|P_opt| P_opt.map(|P| NafLookupTable5::<CachedPoint>::from(&P)))
.collect::<Option<Vec<_>>>()
{
Some(x) => x,
None => return None,
};
let mut Q = ExtendedPoint::identity();
@ -101,6 +104,7 @@ impl VartimeMultiscalarMul for Straus {
}
}
}
Q.into()
Some(Q.into())
}
}