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3.3.3 (cont) Add a dedicated Participant type

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This commit is contained in:
Luke Parker
2023-02-23 06:50:45 -05:00
parent 87dea5e455
commit 2d56d24d9c
18 changed files with 308 additions and 237 deletions
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12
crypto/frost/src/nonce.rs
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@@ -25,7 +25,7 @@ use multiexp::multiexp_vartime;
use dleq::MultiDLEqProof;
use crate::curve::Curve;
use crate::{curve::Curve, Participant};
// Transcript used to aggregate binomial nonces for usage within a single DLEq proof.
fn aggregation_transcript<T: Transcript>(context: &[u8]) -> T {
@@ -247,17 +247,17 @@ pub(crate) struct IndividualBinding<C: Curve> {
binding_factors: Option<Vec<C::F>>,
}
pub(crate) struct BindingFactor<C: Curve>(pub(crate) HashMap<u16, IndividualBinding<C>>);
pub(crate) struct BindingFactor<C: Curve>(pub(crate) HashMap<Participant, IndividualBinding<C>>);
impl<C: Curve> BindingFactor<C> {
pub(crate) fn insert(&mut self, i: u16, commitments: Commitments<C>) {
pub(crate) fn insert(&mut self, i: Participant, commitments: Commitments<C>) {
self.0.insert(i, IndividualBinding { commitments, binding_factors: None });
}
pub(crate) fn calculate_binding_factors<T: Clone + Transcript>(&mut self, transcript: &mut T) {
for (l, binding) in self.0.iter_mut() {
let mut transcript = transcript.clone();
transcript.append_message(b"participant", C::F::from(u64::from(*l)).to_repr());
transcript.append_message(b"participant", C::F::from(u64::from(u16::from(*l))).to_repr());
// It *should* be perfectly fine to reuse a binding factor for multiple nonces
// This generates a binding factor per nonce just to ensure it never comes up as a question
binding.binding_factors = Some(
@@ -268,12 +268,12 @@ impl<C: Curve> BindingFactor<C> {
}
}
pub(crate) fn binding_factors(&self, i: u16) -> &[C::F] {
pub(crate) fn binding_factors(&self, i: Participant) -> &[C::F] {
self.0[&i].binding_factors.as_ref().unwrap()
}
// Get the bound nonces for a specific party
pub(crate) fn bound(&self, l: u16) -> Vec<Vec<C::G>> {
pub(crate) fn bound(&self, l: Participant) -> Vec<Vec<C::G>> {
let mut res = vec![];
for (i, (nonce, rho)) in
self.0[&l].commitments.nonces.iter().zip(self.binding_factors(l).iter()).enumerate()