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eth2.0-specs
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add explicit instrucutions for construction of signed_aggregate_and_proof. add DOMAIN_SELECTION_PROOF and DOMAIN_AGGREGATE_AND_PROOF

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Danny Ryan 2020-02-11 15:45:51 -07:00
parent 8d16d428e0
commit eec57f29b7
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4 changed files with 39 additions and 6 deletions
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2
configs/mainnet.yaml
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@ -143,6 +143,8 @@ DOMAIN_BEACON_ATTESTER: 0x01000000
DOMAIN_RANDAO: 0x02000000
DOMAIN_DEPOSIT: 0x03000000
DOMAIN_VOLUNTARY_EXIT: 0x04000000
DOMAIN_SELECTION_PROOF: 0x05000000
DOMAIN_AGGREGATE_AND_PROOF: 0x06000000
# Phase 1
DOMAIN_SHARD_PROPOSAL: 0x80000000
DOMAIN_SHARD_COMMITTEE: 0x81000000

2
configs/minimal.yaml
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@ -142,6 +142,8 @@ DOMAIN_BEACON_ATTESTER: 0x01000000
DOMAIN_RANDAO: 0x02000000
DOMAIN_DEPOSIT: 0x03000000
DOMAIN_VOLUNTARY_EXIT: 0x04000000
DOMAIN_SELECTION_PROOF: 0x05000000
DOMAIN_AGGREGATE_AND_PROOF: 0x06000000
# Phase 1
DOMAIN_SHARD_PROPOSAL: 0x80000000
DOMAIN_SHARD_COMMITTEE: 0x81000000

3
specs/phase0/beacon-chain.md
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@ -258,6 +258,9 @@ The following values are (non-configurable) constants used throughout the specif
| `DOMAIN_RANDAO` | `DomainType('0x02000000')` |
| `DOMAIN_DEPOSIT` | `DomainType('0x03000000')` |
| `DOMAIN_VOLUNTARY_EXIT` | `DomainType('0x04000000')` |
| `DOMAIN_SELECTION_PROOF` | `DomainType('0x05000000')` |
| `DOMAIN_AGGREGATE_AND_PROOF` | `DomainType('0x06000000')` |
## Containers

28
specs/phase0/validator.md
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@ -424,7 +424,7 @@ A validator is selected to aggregate based upon the return value of `is_aggregat
```python
def get_slot_signature(state: BeaconState, slot: Slot, privkey: int) -> BLSSignature:
domain = get_domain(state, DOMAIN_BEACON_ATTESTER, compute_epoch_at_slot(slot))
domain = get_domain(state, DOMAIN_SELECTION_PROOF, compute_epoch_at_slot(slot))
signing_root = compute_signing_root(slot, domain)
return bls.Sign(privkey, signing_root)
```
@ -468,6 +468,32 @@ Selection proofs are provided in `AggregateAndProof` to prove to the gossip chan
`AggregateAndProof` messages are signed by the aggregator and broadcast inside of `SignedAggregateAndProof` objects to prevent a class of DoS attacks and message forgeries.
First, `aggregate_and_proof = get_aggregate_and_proof(state, aggregate_attestation, validator_index, privkey)` is contructed.
```python
def get_aggregate_and_proof(state: BeaconState,
aggregate: Attestation,
aggregator_index: ValidatorIndex,
privkey: int) -> AggregateAndProof:
return AggregateAndProof(
aggregator_index=aggregator_index,
aggregate=aggregate,
selection_proof=get_slot_signature(state, aggregate.data.slot, privkey),
)
```
Then `signed_aggregate_and_proof = SignedAggregateAndProof(message=aggregate_and_proof, signature=signature)` is constructed and broadast. Where `signature` is obtained from:
```python
def get_aggregate_and_proof_signature(state: BeaconState,
aggregate_and_proof: AggregateAndProof,
privkey: int) -> BLSSignature:
aggregate = aggregate_and_proof.aggregate
domain = get_domain(state, DOMAIN_AGGREGATE_AND_PROOF, compute_epoch_at_slot(aggregate.data.slot))
signing_root = compute_signing_root(aggregate_and_proof, domain)
return bls.Sign(privkey, signing_root)
```
##### `AggregateAndProof`
```python