add rayon lib, use par_iter for encrypt_vote fn (#71)

Author: Mr-Leshiy

rust/catalyst-voting/Cargo.toml

@@ -23,6 +23,7 @@ rand_chacha = "0.3.1"
 curve25519-dalek = { version = "4.1.3", features = ["digest", "rand_core"] }
 ed25519-dalek = { version = "2.1.1", features = ["rand_core"] }
 blake2b_simd = "1.0.2"
+rayon = "1.10.0"
 
 [dev-dependencies]
 criterion = "0.5.1"

rust/catalyst-voting/src/vote_protocol/voter/mod.rs

@@ -5,6 +5,7 @@ pub mod proof;
 
 use anyhow::{anyhow, bail, ensure};
 use rand_core::CryptoRngCore;
+use rayon::iter::{IndexedParallelIterator, IntoParallelRefIterator, ParallelIterator};
 
 use super::committee::{ElectionPublicKey, ElectionSecretKey};
 use crate::crypto::{
@@ -97,8 +98,8 @@ pub fn encrypt_vote<R: CryptoRngCore>(
 
     let unit_vector = vote.to_unit_vector();
     let ciphers = unit_vector
-        .iter()
-        .zip(randomness.0.iter())
+        .par_iter()
+        .zip(randomness.0.par_iter())
         .map(|(m, r)| encrypt(m, &public_key.0, r))
         .collect();