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Have the DKG explicitly declare how to interpolate its shares

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Removes the hack for MuSig where we multiply keys by the inverse of their
lagrange interpolation factor.
This commit is contained in:
Luke Parker
2024-08-05 06:06:56 -04:00
parent 1b7613329c
commit f08faeadff
10 changed files with 108 additions and 68 deletions
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7
networks/monero/ringct/clsag/src/multisig.rs
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@@ -20,7 +20,6 @@ use group::{
use transcript::{Transcript, RecommendedTranscript};
use dalek_ff_group as dfg;
use frost::{
dkg::lagrange,
curve::Ed25519,
Participant, FrostError, ThresholdKeys, ThresholdView,
algorithm::{WriteAddendum, Algorithm},
@@ -233,8 +232,10 @@ impl Algorithm<Ed25519> for ClsagMultisig {
.append_message(b"key_image_share", addendum.key_image_share.compress().to_bytes());
// Accumulate the interpolated share
let interpolated_key_image_share =
addendum.key_image_share * lagrange::<dfg::Scalar>(l, view.included());
let interpolated_key_image_share = addendum.key_image_share *
view
.interpolation_factor(l)
.ok_or(FrostError::InternalError("processing addendum of non-participant"))?;
*self.image.as_mut().unwrap() += interpolated_key_image_share;
self