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feat(wasm-mps): update multi-party-schnorr dependency #389

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feat(wasm-mps): update multi-party-schnorr dependency #389

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9 changes: 5 additions & 4 deletions packages/wasm-mps/Cargo.lock
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2 changes: 1 addition & 1 deletion packages/wasm-mps/Cargo.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -17,7 +17,7 @@ bincode = { package = "bincode-next", version = "3.1.1", features = ["serde"] }
crypto_box = "0.9"
getrandom = { version = "0.2", features = ["js"] }
js-sys = "0.3"
multi-party-schnorr = { git = "https://github.com/silence-laboratories/multi-party-schnorr", rev = "09185d1e4e78d096f2ab3e64d877fb0c88099688", features = ["serde", "eddsa", "redpallas", "vrf"] }
multi-party-schnorr = { version = "1.3.0-pre.9", features = ["serde", "eddsa", "redpallas", "vrf"] }
orchard = { version = "0.13", default-features = false }
pasta_curves = { version = "0.5", default-features = false }
rand = "0.8"
Expand Down
36 changes: 20 additions & 16 deletions packages/wasm-mps/src/lib.rs
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Expand Up @@ -682,15 +682,6 @@ mod mps {
pub party: VrfDkgParty<VrfDkgR2>,
}

/// Duplicate a single broadcast payload into a per-recipient message pool
/// addressed to every other party in a 3-party quorum.
fn broadcast_to_hashmap(party_id: u8, msg: Vec<u8>) -> HashMap<u8, Vec<u8>> {
(0..3)
.filter(|&pid| pid != party_id)
.map(|pid| (pid, msg.clone()))
.collect()
}

/// Process round 0 of VRF DKG (Ristretto, used to back hard derivation).
/// party_id: Party identifier / index.
/// seed: PRNG seed for entropy.
Expand Down Expand Up @@ -765,20 +756,33 @@ mod mps {
.process(vec![i0_msg1, i1_msg1, state.msg])
.map_err(|_| MpsError::ProtocolError)?;

let own_msg2 = msg2
.iter()
.find(|m| m.to_party == party_id)
.cloned()
.ok_or(MpsError::ProtocolError)?;

let new_state = VrfDkgStateR2 {
party_id,
msg: msg2.clone(),
msg: own_msg2,
party: p2,
};

let msg = add_prefix(
"mps-ed25519-vrf-dkg-round2-message$",
&bincode::serde::encode_to_vec(&msg2, bincode::config::standard())
.map_err(|_| MpsError::SerializationError)?,
);
let msg: HashMap<u8, Vec<u8>> = msg2
.iter()
.filter(|m| m.to_party != party_id)
.map(|m| {
let bytes = add_prefix(
"mps-ed25519-vrf-dkg-round2-message$",
&bincode::serde::encode_to_vec(m, bincode::config::standard())
.map_err(|_| MpsError::SerializationError)?,
);
Ok((m.to_party, bytes))
})
.collect::<Result<_, MpsError>>()?;

Ok(MsgStateMap {
msg: broadcast_to_hashmap(party_id, msg),
msg,
state: add_prefix(
"mps-ed25519-vrf-dkg-round2-state$",
&bincode::serde::encode_to_vec(&new_state, bincode::config::standard())
Expand Down
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