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Consolidate Schnorr code in FROST

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This commit is contained in:
Luke Parker
2022-05-25 00:22:00 -04:00
parent d67d6f2f98
commit 1eaf2f897b
4 changed files with 132 additions and 71 deletions
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26
crypto/frost/src/algorithm.rs
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@@ -2,11 +2,10 @@ use core::{marker::PhantomData, fmt::Debug};
use rand_core::{RngCore, CryptoRng};
use group::Group;
use transcript::Transcript;
use crate::{Curve, FrostError, MultisigView};
use crate::{Curve, FrostError, MultisigView, schnorr};
pub use schnorr::SchnorrSignature;
/// Algorithm to use FROST with
pub trait Algorithm<C: Curve>: Clone {
@@ -103,13 +102,6 @@ impl<C: Curve, H: Hram<C>> Schnorr<C, H> {
}
}
#[allow(non_snake_case)]
#[derive(Clone, Copy, PartialEq, Eq, Debug)]
pub struct SchnorrSignature<C: Curve> {
pub R: C::G,
pub s: C::F,
}
/// Implementation of Schnorr signatures for use with FROST
impl<C: Curve, H: Hram<C>> Algorithm<C> for Schnorr<C, H> {
type Transcript = IetfTranscript;
@@ -148,13 +140,13 @@ impl<C: Curve, H: Hram<C>> Algorithm<C> for Schnorr<C, H> {
) -> C::F {
let c = H::hram(&nonce_sum, &params.group_key(), msg);
self.c = Some(c);
nonce + (params.secret_share() * c)
schnorr::sign::<C>(params.secret_share(), nonce, c).s
}
fn verify(&self, group_key: C::G, nonce: C::G, sum: C::F) -> Option<Self::Signature> {
if (C::generator_table() * sum) + (C::G::identity() - (group_key * self.c.unwrap())) == nonce {
Some(SchnorrSignature { R: nonce, s: sum })
let sig = SchnorrSignature { R: nonce, s: sum };
if schnorr::verify::<C>(group_key, self.c.unwrap(), &sig) {
Some(sig)
} else {
None
}
@@ -166,6 +158,10 @@ impl<C: Curve, H: Hram<C>> Algorithm<C> for Schnorr<C, H> {
nonce: C::G,
share: C::F,
) -> bool {
(C::generator_table() * share) == (nonce + (verification_share * self.c.unwrap()))
schnorr::verify::<C>(
verification_share,
self.c.unwrap(),
&SchnorrSignature { R: nonce, s: share}
)
}
}