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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/bls12_381/fr.rs
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@@ -724,8 +724,8 @@ fn test_fr_squaring() {
}
#[test]
fn test_fr_inverse() {
assert!(Fr::zero().inverse().is_none());
fn test_fr_invert() {
assert!(bool::from(Fr::zero().invert().is_none()));
let mut rng = XorShiftRng::from_seed([
0x59, 0x62, 0xbe, 0x5d, 0x76, 0x3d, 0x31, 0x8d, 0x17, 0xdb, 0x37, 0x32, 0x54, 0x06, 0xbc,
@@ -737,7 +737,7 @@ fn test_fr_inverse() {
for _ in 0..1000 {
// Ensure that a * a^-1 = 1
let mut a = Fr::random(&mut rng);
let ainv = a.inverse().unwrap();
let ainv = a.invert().unwrap();
a.mul_assign(&ainv);
assert_eq!(a, one);
}