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DKG Removals (#467)

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* Update ValidatorSets with a remove_participant call

* Add DkgRemoval, a sign machine for producing the relevant MuSig signatures

* Don't use position-dependent u8s yet Public when removing validators from the DKG

* Add DkgRemovalPreprocess, DkgRemovalShares

Implementation is via a new publish_tributary_tx lambda.

This is code is a copy-pasted mess which will need to be cleaned up.

* Only allow non-removed validators to vote for removals

Otherwise, it's risked that the remaining validators fall below 67% of the
original set.

* Correct publish_serai_tx, which was prior publish_set_keys in practice
This commit is contained in:
Luke Parker
2023-12-04 07:04:44 -05:00
committed by GitHub
parent 99c6375605
commit 797ed49e7b
11 changed files with 1022 additions and 170 deletions
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7
substrate/validator-sets/primitives/src/lib.rs
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@@ -98,9 +98,14 @@ pub fn musig_key(set: ValidatorSet, set_keys: &[Public]) -> Public {
Public(dkg::musig::musig_key::<Ristretto>(&musig_context(set), &keys).unwrap().to_bytes())
}
/// The message for the remove_participant signature.
pub fn remove_participant_message(set: &ValidatorSet, removed: Public) -> Vec<u8> {
(b"ValidatorSets-remove_participant", set, removed).encode()
}
/// The message for the set_keys signature.
pub fn set_keys_message(set: &ValidatorSet, key_pair: &KeyPair) -> Vec<u8> {
[b"ValidatorSets-key_pair".as_ref(), &(set, key_pair).encode()].concat()
(b"ValidatorSets-set_keys", set, key_pair).encode()
}
/// For a set of validators whose key shares may exceed the maximum, reduce until they equal the