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Implement variable-sized windows into multiexp

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Closes https://github.com/serai-dex/serai/issues/17 by using the 
PrimeFieldBits API to do so.

Should greatly speed up small batches, along with batches in the 
hundreds. Saves almost a full second on the cross-group DLEq proof.
This commit is contained in:
Luke Parker
2022-06-30 09:30:24 -04:00
parent 5d115f1e1c
commit 7890827a48
15 changed files with 342 additions and 148 deletions
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7
crypto/frost/src/tests/curve.rs
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@@ -21,7 +21,8 @@ pub fn test_curve<R: RngCore + CryptoRng, C: Curve>(rng: &mut R) {
// TODO: Test the Curve functions themselves
// Test successful multiexp, with enough pairs to trigger its variety of algorithms
// TODO: This should probably be under multiexp
// Multiexp has its own tests, yet only against k256 and Ed25519 (which should be sufficient
// as-is to prove multiexp), and this doesn't hurt
{
let mut pairs = Vec::with_capacity(1000);
let mut sum = C::G::identity();
@@ -30,8 +31,8 @@ pub fn test_curve<R: RngCore + CryptoRng, C: Curve>(rng: &mut R) {
pairs.push((C::F::random(&mut *rng), C::GENERATOR * C::F::random(&mut *rng)));
sum += pairs[pairs.len() - 1].1 * pairs[pairs.len() - 1].0;
}
assert_eq!(multiexp::multiexp(&pairs, C::LITTLE_ENDIAN), sum);
assert_eq!(multiexp::multiexp_vartime(&pairs, C::LITTLE_ENDIAN), sum);
assert_eq!(multiexp::multiexp(&pairs), sum);
assert_eq!(multiexp::multiexp_vartime(&pairs), sum);
}
}