serai/substrate/client/tests/common/validator_sets.rs

use std::collections::HashMap;

use zeroize::Zeroizing;
use rand_core::OsRng;

use scale::Encode;

use sp_core::{Pair, sr25519::Signature};

use ciphersuite::{group::GroupEncoding, Ciphersuite, Ristretto};
use frost::dkg::musig::*;
use schnorrkel::Schnorrkel;

use serai_client::{
  primitives::insecure_pair_from_name,
  validator_sets::{
    primitives::{ValidatorSet, KeyPair},
    ValidatorSetsEvent,
  },
  Serai,
};

use crate::common::{serai, tx::publish_tx};

#[allow(dead_code)]
pub async fn set_validator_set_keys(set: ValidatorSet, key_pair: KeyPair) -> [u8; 32] {
  let pair = insecure_pair_from_name("Alice");
  let public = pair.public();

  let serai = serai().await;
  let public_key = <Ristretto as Ciphersuite>::read_G::<&[u8]>(&mut public.0.as_ref()).unwrap();
  assert_eq!(
    serai.get_validator_set_musig_key(set).await.unwrap().unwrap(),
    musig_key::<Ristretto>(&[public_key]).unwrap().to_bytes()
  );

  let secret_key = <Ristretto as Ciphersuite>::read_F::<&[u8]>(
    &mut pair.as_ref().secret.to_bytes()[.. 32].as_ref(),
  )
  .unwrap();
  assert_eq!(Ristretto::generator() * secret_key, public_key);
  let threshold_keys = musig::<Ristretto>(&Zeroizing::new(secret_key), &[public_key]).unwrap();
  assert_eq!(
    serai.get_validator_set_musig_key(set).await.unwrap().unwrap(),
    threshold_keys.group_key().to_bytes()
  );

  let sig = frost::tests::sign_without_caching(
    &mut OsRng,
    frost::tests::algorithm_machines(
      &mut OsRng,
      Schnorrkel::new(b"substrate"),
      &HashMap::from([(threshold_keys.params().i(), threshold_keys.into())]),
    ),
    &key_pair.encode(),
  );

  // Vote in a key pair
  let block = publish_tx(&Serai::set_validator_set_keys(
    set.network,
    key_pair.clone(),
    Signature(sig.to_bytes()),
  ))
  .await;

  assert_eq!(
    serai.get_key_gen_events(block).await.unwrap(),
    vec![ValidatorSetsEvent::KeyGen { set, key_pair: key_pair.clone() }]
  );
  assert_eq!(serai.get_keys(set).await.unwrap(), Some(key_pair));

  block
}