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Handle the combination of DKG removals with re-attempts

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With a DKG removal comes a reduction in the amount of participants which was
ignored by re-attempts.

Now, we determine n/i based on the parties removed, and deterministically
obtain the context of who was removd.
This commit is contained in:
Luke Parker
2023-12-13 14:03:07 -05:00
parent 884b6a6fec
commit 77edd00725
15 changed files with 410 additions and 132 deletions
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15
processor/src/key_gen.rs
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@@ -29,7 +29,7 @@ pub struct KeyConfirmed<C: Ciphersuite> {
create_db!(
KeyGenDb {
ParamsDb: (session: &Session) -> (ThresholdParams, u16),
ParamsDb: (session: &Session, attempt: u32) -> (ThresholdParams, u16),
// Not scoped to the set since that'd have latter attempts overwrite former
// A former attempt may become the finalized attempt, even if it doesn't in a timely manner
// Overwriting its commitments would be accordingly poor
@@ -152,7 +152,10 @@ impl<N: Network, D: Db> KeyGen<N, D> {
pub fn in_set(&self, session: &Session) -> bool {
// We determine if we're in set using if we have the parameters for a session's key generation
ParamsDb::get(&self.db, session).is_some()
// The usage of 0 for the attempt is valid so long as we aren't malicious and accordingly
// aren't fatally slashed
// TODO: Revisit once we do DKG removals for being offline
ParamsDb::get(&self.db, session, 0).is_some()
}
#[allow(clippy::type_complexity)]
@@ -319,7 +322,7 @@ impl<N: Network, D: Db> KeyGen<N, D> {
self.active_share.remove(&id.session).is_none()
{
// If we haven't handled this session before, save the params
ParamsDb::set(txn, &id.session, &(params, shares));
ParamsDb::set(txn, &id.session, id.attempt, &(params, shares));
}
let (machines, commitments) = key_gen_machines(id, params, shares);
@@ -338,7 +341,7 @@ impl<N: Network, D: Db> KeyGen<N, D> {
panic!("commitments when already handled commitments");
}
let (params, share_quantity) = ParamsDb::get(txn, &id.session).unwrap();
let (params, share_quantity) = ParamsDb::get(txn, &id.session, id.attempt).unwrap();
// Unwrap the machines, rebuilding them if we didn't have them in our cache
// We won't if the processor rebooted
@@ -373,7 +376,7 @@ impl<N: Network, D: Db> KeyGen<N, D> {
CoordinatorMessage::Shares { id, shares } => {
info!("Received shares for {:?}", id);
let (params, share_quantity) = ParamsDb::get(txn, &id.session).unwrap();
let (params, share_quantity) = ParamsDb::get(txn, &id.session, id.attempt).unwrap();
// Same commentary on inconsistency as above exists
let (machines, our_shares) = self.active_share.remove(&id.session).unwrap_or_else(|| {
@@ -514,7 +517,7 @@ impl<N: Network, D: Db> KeyGen<N, D> {
}
CoordinatorMessage::VerifyBlame { id, accuser, accused, share, blame } => {
let params = ParamsDb::get(txn, &id.session).unwrap().0;
let params = ParamsDb::get(txn, &id.session, id.attempt).unwrap().0;
let mut share_ref = share.as_slice();
let Ok(substrate_share) = EncryptedMessage::<