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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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6
pairing/src/tests/field.rs
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@@ -78,7 +78,7 @@ pub fn random_field_tests<F: Field>() {
assert!(z.is_zero());
}
assert!(F::zero().inverse().is_none());
assert!(bool::from(F::zero().invert().is_none()));
// Multiplication by zero
{
@@ -222,11 +222,11 @@ fn random_squaring_tests<F: Field, R: RngCore>(rng: &mut R) {
}
fn random_inversion_tests<F: Field, R: RngCore>(rng: &mut R) {
assert!(F::zero().inverse().is_none());
assert!(bool::from(F::zero().invert().is_none()));
for _ in 0..10000 {
let mut a = F::random(rng);
let b = a.inverse().unwrap(); // probablistically nonzero
let b = a.invert().unwrap(); // probablistically nonzero
a.mul_assign(&b);
assert_eq!(a, F::one());