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Ensure multiexp never uses a zero-weight in its batch verifier

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Luke Parker 2022-07-02 14:08:04 -04:00
parent daadb43875
commit a81a76da3b
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1 changed files with 6 additions and 1 deletions
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7
crypto/multiexp/src/batch.rs
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@ -22,7 +22,12 @@ impl<Id: Copy, G: Group> BatchVerifier<Id, G> where <G as Group>::Scalar: PrimeF
let u = if self.0.len() == 0 { let u = if self.0.len() == 0 {
G::Scalar::one() G::Scalar::one()
} else { } else {
G::Scalar::random(rng) let mut weight = G::Scalar::random(&mut *rng);
// Ensure it's non-zero, as a zero scalar would cause this item to pass no matter what
while weight.is_zero().into() {
weight = G::Scalar::random(&mut *rng);
}
weight
}; };
self.0.push((id, pairs.into_iter().map(|(scalar, point)| (scalar * u, point)).collect())); self.0.push((id, pairs.into_iter().map(|(scalar, point)| (scalar * u, point)).collect()));
} }