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Remove C::F_len, C::G_len for F_len<C> and G_len<C>

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Relies on the ff/group API, instead of the custom Curve type.

Also removes GENERATOR_TABLE, only used by dalek, as we should provide 
our own API for that over ff/group instead. This slows down the FROST 
tests, under debug, by about 0.2-0.3s. Ed25519 and Ristretto together 
take ~2.15 seconds now.
This commit is contained in:
Luke Parker
2022-06-30 18:46:18 -04:00
parent 4eafbe2a09
commit 133c1222ad
9 changed files with 46 additions and 84 deletions
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8
crypto/frost/src/schnorr.rs
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@@ -4,7 +4,7 @@ use group::{ff::{Field, PrimeField}, GroupEncoding};
use multiexp::BatchVerifier;
use crate::Curve;
use crate::{Curve, F_len, G_len};
#[allow(non_snake_case)]
#[derive(Clone, Copy, PartialEq, Eq, Debug)]
@@ -15,7 +15,7 @@ pub struct SchnorrSignature<C: Curve> {
impl<C: Curve> SchnorrSignature<C> {
pub fn serialize(&self) -> Vec<u8> {
let mut res = Vec::with_capacity(C::G_len() + C::F_len());
let mut res = Vec::with_capacity(G_len::<C>() + F_len::<C>());
res.extend(self.R.to_bytes().as_ref());
res.extend(self.s.to_repr().as_ref());
res
@@ -28,7 +28,7 @@ pub(crate) fn sign<C: Curve>(
challenge: C::F
) -> SchnorrSignature<C> {
SchnorrSignature {
R: C::GENERATOR_TABLE * nonce,
R: C::GENERATOR * nonce,
s: nonce + (private_key * challenge)
}
}
@@ -38,7 +38,7 @@ pub(crate) fn verify<C: Curve>(
challenge: C::F,
signature: &SchnorrSignature<C>
) -> bool {
(C::GENERATOR_TABLE * signature.s) == (signature.R + (public_key * challenge))
(C::GENERATOR * signature.s) == (signature.R + (public_key * challenge))
}
pub(crate) fn batch_verify<C: Curve, R: RngCore + CryptoRng>(