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Constant-time field inversion

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WARNING: THIS IS NOT ACTUALLY CONSTANT TIME YET!

The jubjub and bls12_381 crates will replace our constant-time usages,
but we NEED to fix ff_derive because other users will expect it to
implement the Field trait correctly.
This commit is contained in:
Jack Grigg
2019-05-14 14:18:37 +01:00
parent e85a9f309f
commit 40749da9a7
25 changed files with 243 additions and 221 deletions
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11
bellman/src/domain.rs
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@@ -73,11 +73,11 @@ impl<E: ScalarEngine, G: Group<E>> EvaluationDomain<E, G> {
coeffs,
exp,
omega,
omegainv: omega.inverse().unwrap(),
geninv: E::Fr::multiplicative_generator().inverse().unwrap(),
omegainv: omega.invert().unwrap(),
geninv: E::Fr::multiplicative_generator().invert().unwrap(),
minv: E::Fr::from_str(&format!("{}", m))
.unwrap()
.inverse()
.invert()
.unwrap(),
})
}
@@ -141,10 +141,7 @@ impl<E: ScalarEngine, G: Group<E>> EvaluationDomain<E, G> {
/// evaluation domain, so we must perform division over
/// a coset.
pub fn divide_by_z_on_coset(&mut self, worker: &Worker) {
let i = self
.z(&E::Fr::multiplicative_generator())
.inverse()
.unwrap();
let i = self.z(&E::Fr::multiplicative_generator()).invert().unwrap();
worker.scope(self.coeffs.len(), |scope, chunk| {
for v in self.coeffs.chunks_mut(chunk) {