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Improve Field::pow API and impl

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Renamed to Field::pow_vartime to indicate it is still variable time with
respect to the exponent.
This commit is contained in:
Jack Grigg
2019-05-15 11:24:00 +01:00
parent e88e2a9dc2
commit 1c9f5742fa
15 changed files with 75 additions and 72 deletions
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10
zcash_primitives/src/jubjub/fs.rs
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@@ -744,7 +744,7 @@ impl SqrtField for Fs {
// https://eprint.iacr.org/2012/685.pdf (page 9, algorithm 2)
// a1 = self^((s - 3) // 4)
let mut a1 = self.pow([
let mut a1 = self.pow_vartime([
0xb425c397b5bdcb2d,
0x299a0824f3320420,
0x4199cec0404d0ec0,
@@ -1495,7 +1495,7 @@ fn test_fs_pow() {
// Exponentiate by various small numbers and ensure it consists with repeated
// multiplication.
let a = Fs::random(&mut rng);
let target = a.pow(&[i]);
let target = a.pow_vartime(&[i]);
let mut c = Fs::one();
for _ in 0..i {
c.mul_assign(&a);
@@ -1507,7 +1507,7 @@ fn test_fs_pow() {
// Exponentiating by the modulus should have no effect in a prime field.
let a = Fs::random(&mut rng);
assert_eq!(a, a.pow(Fs::char()));
assert_eq!(a, a.pow_vartime(Fs::char()));
}
}
@@ -1688,7 +1688,7 @@ fn test_fs_root_of_unity() {
Fs::from_repr(FsRepr::from(6)).unwrap()
);
assert_eq!(
Fs::multiplicative_generator().pow([
Fs::multiplicative_generator().pow_vartime([
0x684b872f6b7b965b,
0x53341049e6640841,
0x83339d80809a1d80,
@@ -1696,6 +1696,6 @@ fn test_fs_root_of_unity() {
]),
Fs::root_of_unity()
);
assert_eq!(Fs::root_of_unity().pow([1 << Fs::S]), Fs::one());
assert_eq!(Fs::root_of_unity().pow_vartime([1 << Fs::S]), Fs::one());
assert!(bool::from(Fs::multiplicative_generator().sqrt().is_none()));
}