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Reorder Altair gossip validation conditions 

Validate the `selection_proof` selects the incoming validator as an
aggregator before doing other checks like committee inclusion and
(relatively) expensive signature checks.
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Alex Stokes 2021-03-30 16:18:14 -07:00
parent a465f21deb
commit b151adbd4e
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specs/altair/p2p-interface.md
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@ -89,10 +89,10 @@ The following validations MUST pass before forwarding the `signed_contribution_a
- _[IGNORE]_ The block being signed over (`contribution.beacon_block_root`) has been seen (via both gossip and non-gossip sources).
- _[REJECT]_ The subcommittee index is in the allowed range, i.e. `contribution.subcommittee_index < SYNC_COMMITTEE_SUBNET_COUNT`.
- _[IGNORE]_ The sync committee contribution is the first valid contribution received for the aggregator with index `contribution_and_proof.aggregator_index` for the slot `contribution.slot`.
- _[REJECT]_ `contribution_and_proof.selection_proof` selects the validator as an aggregator for the slot -- i.e. `is_sync_committee_aggregator(state, contribution.slot, contribution_and_proof.selection_proof)` returns `True`.
- _[REJECT]_ The aggregator's validator index is within the current sync committee --
i.e. `state.validators[aggregate_and_proof.aggregator_index].pubkey in state.current_sync_committee.pubkeys`.
- _[REJECT]_ The `contribution_and_proof.selection_proof` is a valid signature of the `contribution.slot` by the validator with index `contribution_and_proof.aggregator_index`.
- _[REJECT]_ `contribution_and_proof.selection_proof` selects the validator as an aggregator for the slot -- i.e. `is_sync_committee_aggregator(state, contribution.slot, contribution_and_proof.selection_proof)` returns `True`.
- _[REJECT]_ The aggregator signature, `signed_contribution_and_proof.signature`, is valid.
- _[REJECT]_ The aggregate signature is valid for the message `beacon_block_root` and aggregate pubkey derived from the participation info in `aggregation_bits` for the subcommittee specified by the `subcommittee_index`.