async def propose_or_skip_block(self, slot: Slot,
is_second_tick: bool) -> None:
head = self.chain.get_canonical_head()
state_machine = self.chain.get_state_machine()
state = state_machine.state
self.logger.debug(
bold_green(
f"head: slot={head.slot}, state root={head.state_root.hex()}"))
proposer_index = _get_proposer_index(
state,
slot,
state_machine.config,
)
# Since it's expected to tick twice in one slot, `latest_proposed_epoch` is used to prevent
# proposing twice in the same slot.
has_proposed = slot_to_epoch(
slot, self.slots_per_epoch) <= self.latest_proposed_epoch
if not has_proposed and proposer_index in self.validator_privkeys:
self.propose_block(
proposer_index=proposer_index,
slot=slot,
state=state,
state_machine=state_machine,
head_block=head,
)
self.latest_proposed_epoch = slot_to_epoch(slot,
self.slots_per_epoch)
# skip the block if it's second half of the slot and we are not proposing
elif is_second_tick and proposer_index not in self.validator_privkeys:
self.skip_block(
slot=slot,
state=state,
state_machine=state_machine,
)
def _correct_slashable_attestation_params(epoch_length, num_validators, params,
messages, privkeys, fork):
valid_params = copy.deepcopy(params)
key = "custody_bit_0_indices"
(poc_0_indices, poc_0_signatures) = _get_indices_and_signatures(
num_validators,
messages[0],
privkeys,
fork,
slot_to_epoch(params["data"].slot, epoch_length),
)
valid_params[key] = poc_0_indices
key = "custody_bit_1_indices"
# NOTE: does not guarantee non-empty intersection
(poc_1_indices, poc_1_signatures) = _get_indices_and_signatures(
num_validators,
messages[1],
privkeys,
fork,
slot_to_epoch(params["data"].slot, epoch_length),
)
valid_params[key] = poc_1_indices
signatures = poc_0_signatures + poc_1_signatures
aggregate_signature = bls.aggregate_signatures(signatures)
valid_params["aggregate_signature"] = aggregate_signature
return valid_params
def validate_proposer_slashing_epoch(proposer_slashing: ProposerSlashing,
slots_per_epoch: int) -> None:
epoch_1 = slot_to_epoch(proposer_slashing.header_1.slot, slots_per_epoch)
epoch_2 = slot_to_epoch(proposer_slashing.header_2.slot, slots_per_epoch)
if epoch_1 != epoch_2:
raise ValidationError(
f"Epoch of proposer_slashing.proposal_1 ({epoch_1}) !="
f" epoch of proposer_slashing.proposal_2 ({epoch_2})")
def process_final_updates(state: BeaconState,
config: BeaconConfig) -> BeaconState:
current_epoch = state.current_epoch(config.SLOTS_PER_EPOCH)
next_epoch = state.next_epoch(config.SLOTS_PER_EPOCH)
state = _update_latest_active_index_roots(state, CommitteeConfig(config))
state = state.copy(
latest_slashed_balances=update_tuple_item(
state.latest_slashed_balances,
next_epoch % config.LATEST_SLASHED_EXIT_LENGTH,
state.latest_slashed_balances[current_epoch %
config.LATEST_SLASHED_EXIT_LENGTH],
),
latest_randao_mixes=update_tuple_item(
state.latest_randao_mixes,
next_epoch % config.LATEST_SLASHED_EXIT_LENGTH,
get_randao_mix(
state=state,
epoch=current_epoch,
slots_per_epoch=config.SLOTS_PER_EPOCH,
latest_randao_mixes_length=config.LATEST_RANDAO_MIXES_LENGTH,
),
),
)
latest_attestations = tuple(
filter(
lambda attestation:
(slot_to_epoch(attestation.data.slot, config.SLOTS_PER_EPOCH) >=
current_epoch), state.latest_attestations))
state = state.copy(latest_attestations=latest_attestations, )
return state
def get_beacon_proposer_index(state: 'BeaconState',
slot: Slot,
committee_config: CommitteeConfig,
registry_change: bool=False) -> ValidatorIndex:
"""
Return the beacon proposer index for the ``slot``.
"""
epoch = slot_to_epoch(slot, committee_config.SLOTS_PER_EPOCH)
previous_epoch = state.previous_epoch(committee_config.SLOTS_PER_EPOCH)
next_epoch = state.next_epoch(committee_config.SLOTS_PER_EPOCH)
validate_epoch_within_previous_and_next(epoch, previous_epoch, next_epoch)
crosslink_committees_at_slot = get_crosslink_committees_at_slot(
state=state,
slot=slot,
committee_config=committee_config,
registry_change=registry_change,
)
try:
first_crosslink_committee = crosslink_committees_at_slot[0]
except IndexError:
raise ValidationError("crosslink_committees should not be empty.")
first_committee, _ = first_crosslink_committee
if len(first_committee) <= 0:
raise ValidationError(
"The first committee should not be empty"
)
return first_committee[epoch % len(first_committee)]
def process_final_updates(state: BeaconState,
config: BeaconConfig) -> BeaconState:
current_epoch = state.current_epoch(config.EPOCH_LENGTH)
next_epoch = state.next_epoch(config.EPOCH_LENGTH)
state = state.copy(
latest_penalized_balances=update_tuple_item(
state.latest_penalized_balances,
next_epoch % config.LATEST_PENALIZED_EXIT_LENGTH,
state.latest_penalized_balances[
current_epoch % config.LATEST_PENALIZED_EXIT_LENGTH],
),
latest_randao_mixes=update_tuple_item(
state.latest_randao_mixes,
next_epoch % config.LATEST_PENALIZED_EXIT_LENGTH,
get_randao_mix(
state=state,
epoch=current_epoch,
epoch_length=config.EPOCH_LENGTH,
latest_randao_mixes_length=config.LATEST_RANDAO_MIXES_LENGTH,
),
),
)
latest_attestations = tuple(
filter(
lambda attestation: (slot_to_epoch(attestation.data.slot, config.
EPOCH_LENGTH) >= current_epoch),
state.latest_attestations))
state = state.copy(latest_attestations=latest_attestations, )
return state
def test_update_latest_active_index_roots(genesis_state,
committee_config,
state_slot,
slots_per_epoch,
latest_active_index_roots_length,
activation_exit_delay):
state = genesis_state.copy(
slot=state_slot,
)
result_state = _update_latest_active_index_roots(state, committee_config)
# TODO: chanege to hash_tree_root
index_root = hash_eth2(
b''.join(
[
index.to_bytes(32, 'little')
for index in get_active_validator_indices(
state.validator_registry,
# TODO: change to `per-epoch` version
slot_to_epoch(state.slot, slots_per_epoch),
)
]
)
)
target_epoch = state.next_epoch(slots_per_epoch) + activation_exit_delay
assert result_state.latest_active_index_roots[
target_epoch % latest_active_index_roots_length
] == index_root
def create_block_on_state(
*,
state: BeaconState,
config: BeaconConfig,
state_machine: BaseBeaconStateMachine,
block_class: BaseBeaconBlock,
parent_block: BaseBeaconBlock,
slot: SlotNumber,
validator_index: ValidatorIndex,
privkey: int,
attestations: Sequence[Attestation],
check_proposer_index: bool = True) -> BaseBeaconBlock:
"""
Create a beacon block with the given parameters.
"""
# Check proposer
if check_proposer_index:
validate_proposer_index(state, config, slot, validator_index)
# Prepare block: slot and parent_root
block = block_class.from_parent(
parent_block=parent_block,
block_params=FromBlockParams(slot=slot),
)
# TODO: Add more operations
randao_reveal = ZERO_HASH32
eth1_data = Eth1Data.create_empty_data()
body = BeaconBlockBody.create_empty_body().copy(
attestations=attestations, )
block = block.copy(
randao_reveal=randao_reveal,
eth1_data=eth1_data,
body=body,
)
# Apply state transition to get state root
state, block = state_machine.import_block(block,
check_proposer_signature=True)
# Sign
empty_signature_block_root = block.block_without_signature_root
proposal_root = ProposalSignedData(
slot,
config.BEACON_CHAIN_SHARD_NUMBER,
empty_signature_block_root,
).root
domain = get_domain(
state.fork,
slot_to_epoch(slot, config.EPOCH_LENGTH),
SignatureDomain.DOMAIN_PROPOSAL,
)
block = block.copy(signature=bls.sign(
message=proposal_root,
privkey=privkey,
domain=domain,
), )
return block
async def test_validator_attest(event_loop, event_bus, monkeypatch):
alice_indices = [i for i in range(8)]
alice = await get_validator(event_loop=event_loop,
event_bus=event_bus,
indices=alice_indices)
head = alice.chain.get_canonical_head()
state_machine = alice.chain.get_state_machine()
state = state_machine.state
epoch = slot_to_epoch(state.slot, state_machine.config.SLOTS_PER_EPOCH)
assignment = alice._get_this_epoch_assignment(alice_indices[0], epoch)
attestations = await alice.attest(assignment.slot)
assert len(attestations) == 1
attestation = attestations[0]
assert get_attestation_data_slot(
state,
attestation.data,
state_machine.config,
) == assignment.slot
assert attestation.data.beacon_block_root == head.signing_root
assert attestation.data.crosslink.shard == assignment.shard
# Advance the state and validate the attestation
config = state_machine.config
future_state = state_machine.state_transition.apply_state_transition(
state,
future_slot=assignment.slot + config.MIN_ATTESTATION_INCLUSION_DELAY,
)
validate_attestation(
future_state,
attestation,
config,
)
def verify_slashable_attestation_signature(
state: BeaconState, slashable_attestation: SlashableAttestation,
slots_per_epoch: int) -> bool:
"""
Ensure we have a valid aggregate signature for the ``slashable_attestation``.
"""
all_indices = slashable_attestation.custody_bit_indices
pubkeys: Tuple[BLSPubkey, ...] = generate_aggregate_pubkeys_from_indices(
state.validator_registry,
*all_indices,
)
message_hashes: Tuple[Hash32, ...] = slashable_attestation.message_hashes
signature = slashable_attestation.aggregate_signature
domain = get_domain(
state.fork,
slot_to_epoch(slashable_attestation.data.slot, slots_per_epoch),
SignatureDomain.DOMAIN_ATTESTATION,
)
# No custody bit 1 indice votes in phase 0, so we only need to process custody bit 0
# for efficiency.
# TODO: to be removed in phase 1.
if len(all_indices[1]) == 0:
pubkeys = pubkeys[:1]
message_hashes = message_hashes[:1]
return bls.verify_multiple(
pubkeys=pubkeys,
message_hashes=message_hashes,
signature=signature,
domain=domain,
)
def validate_attestation_previous_crosslink_or_root(
attestation_data: AttestationData,
state_latest_crosslink: CrosslinkRecord, slots_per_epoch: int) -> None:
"""
Validate that either the attestation ``previous_crosslink`` or ``crosslink_data_root``
field of ``attestation_data`` is the provided ``latest_crosslink``.
Raise ``ValidationError`` if it's invalid.
"""
attestation_creating_crosslink = CrosslinkRecord(
epoch=slot_to_epoch(attestation_data.slot, slots_per_epoch),
crosslink_data_root=attestation_data.crosslink_data_root,
)
acceptable_crosslink_data = {
# Case 1: Latest crosslink matches the one in the state
attestation_data.previous_crosslink,
# Case 2: State has already been updated, state's latest crosslink matches the crosslink
# the attestation is trying to create
attestation_creating_crosslink,
}
if state_latest_crosslink not in acceptable_crosslink_data:
raise ValidationError(
f"State's latests crosslink ({state_latest_crosslink}) doesn't match "
" case 1: the `attestation_data.previous_crosslink` "
f"({attestation_data.previous_crosslink.root}) or "
"`case 2: the crosslink the attestation is trying to create "
f"({attestation_creating_crosslink})")
def _get_highest_justified_epoch(self, db: BaseDB) -> Epoch:
try:
justified_head_root = self._get_justified_head_root(db)
slot = self.get_slot_by_root(justified_head_root)
return slot_to_epoch(slot, self.config.SLOTS_PER_EPOCH)
except JustifiedHeadNotFound:
return self.config.GENESIS_EPOCH
def _correct_slashable_attestation_params(
slots_per_epoch,
num_validators,
params,
message_hashes,
privkeys,
fork):
valid_params = copy.deepcopy(params)
(validator_indices, signatures) = _get_indices_and_signatures(
num_validators,
message_hashes[0], # custody bit is False
privkeys,
fork,
slot_to_epoch(params["data"].slot, slots_per_epoch),
)
valid_params["validator_indices"] = validator_indices
valid_params["custody_bitfield"] = get_empty_bitfield(len(validator_indices))
aggregate_signature = bls.aggregate_signatures(signatures)
valid_params["aggregate_signature"] = aggregate_signature
return valid_params
def get_crosslink_committees_at_slot(
state: 'BeaconState', slot: SlotNumber, genesis_epoch: EpochNumber,
epoch_length: int, target_committee_size: int, shard_count: int
) -> Iterable[Tuple[Iterable[ValidatorIndex], ShardNumber]]:
"""
Return the list of ``(committee, shard)`` tuples for the ``slot``.
"""
epoch = slot_to_epoch(slot, epoch_length)
current_epoch = state.current_epoch(epoch_length)
validate_epoch_for_current_epoch(
current_epoch=current_epoch,
given_epoch=epoch,
genesis_epoch=genesis_epoch,
epoch_length=epoch_length,
)
# TODO: need to update according to https://github.com/ethereum/eth2.0-specs/pull/520
if epoch < current_epoch:
committees_per_epoch = get_previous_epoch_committee_count(
state=state,
shard_count=shard_count,
epoch_length=epoch_length,
target_committee_size=target_committee_size,
)
seed = state.previous_epoch_seed
shuffling_epoch = state.previous_calculation_epoch
shuffling_start_shard = state.previous_epoch_start_shard
else:
committees_per_epoch = get_current_epoch_committee_count(
state=state,
shard_count=shard_count,
epoch_length=epoch_length,
target_committee_size=target_committee_size,
)
seed = state.current_epoch_seed
shuffling_epoch = state.current_calculation_epoch
shuffling_start_shard = state.current_epoch_start_shard
shuffling = get_shuffling(
seed=seed,
validators=state.validator_registry,
epoch=shuffling_epoch,
epoch_length=epoch_length,
target_committee_size=target_committee_size,
shard_count=shard_count,
)
offset = slot % epoch_length
committees_per_slot = committees_per_epoch // epoch_length
slot_start_shard = (shuffling_start_shard +
committees_per_slot * offset) % shard_count
for index in range(committees_per_slot):
committee = shuffling[committees_per_slot * offset + index]
yield (
committee,
ShardNumber((slot_start_shard + index) % shard_count),
)
def get_current_epoch_attestations(
state: 'BeaconState',
slots_per_epoch: int) -> Iterable[PendingAttestationRecord]:
current_epoch = state.current_epoch(slots_per_epoch)
for attestation in state.latest_attestations:
if current_epoch == slot_to_epoch(attestation.data.slot,
slots_per_epoch):
yield attestation
def get_previous_epoch_attestations(
state: 'BeaconState', slots_per_epoch: int,
genesis_epoch: Epoch) -> Iterable[PendingAttestationRecord]:
previous_epoch = state.previous_epoch(slots_per_epoch, genesis_epoch)
for attestation in state.latest_attestations:
if previous_epoch == slot_to_epoch(attestation.data.slot,
slots_per_epoch):
yield attestation
def test_process_validator_registry(
monkeypatch, genesis_state, epoch_length, state_slot, need_to_update,
num_shards_in_committees, validator_registry_update_epoch,
epochs_since_last_registry_change_is_power_of_two,
current_calculation_epoch, latest_randao_mixes,
expected_current_calculation_epoch, entry_exit_delay, config):
# Mock check_if_update_validator_registry
from eth2.beacon.state_machines.forks.serenity import epoch_processing
def mock_check_if_update_validator_registry(state, config):
return need_to_update, num_shards_in_committees
monkeypatch.setattr(epoch_processing,
'_check_if_update_validator_registry',
mock_check_if_update_validator_registry)
# Mock generate_seed
new_seed = b'\x88' * 32
def mock_generate_seed(state, epoch, epoch_length, seed_lookahead,
entry_exit_delay, latest_index_roots_length,
latest_randao_mixes_length):
return new_seed
monkeypatch.setattr('eth2.beacon.helpers.generate_seed',
mock_generate_seed)
# Set state
state = genesis_state.copy(
slot=state_slot,
validator_registry_update_epoch=validator_registry_update_epoch,
current_calculation_epoch=current_calculation_epoch,
latest_randao_mixes=latest_randao_mixes,
)
result_state = process_validator_registry(state, config)
assert result_state.previous_calculation_epoch == state.current_calculation_epoch
assert result_state.previous_epoch_start_shard == state.current_epoch_start_shard
assert result_state.previous_epoch_seed == state.current_epoch_seed
if need_to_update:
assert result_state.current_calculation_epoch == slot_to_epoch(
state_slot, epoch_length)
assert result_state.current_epoch_seed == new_seed
# TODO: Add test for validator registry updates
else:
assert (result_state.current_calculation_epoch ==
expected_current_calculation_epoch)
# state.current_epoch_start_shard is left unchanged.
assert result_state.current_epoch_start_shard == state.current_epoch_start_shard
if epochs_since_last_registry_change_is_power_of_two:
assert result_state.current_epoch_seed == new_seed
else:
assert result_state.current_epoch_seed != new_seed
async def test_validator_get_committee_assigment(event_loop, event_bus):
alice_indices = [7]
alice = await get_validator(event_loop=event_loop, event_bus=event_bus, indices=alice_indices)
state_machine = alice.chain.get_state_machine()
state = state_machine.state
epoch = slot_to_epoch(state.slot, state_machine.config.SLOTS_PER_EPOCH)
assert alice.this_epoch_assignment[alice_indices[0]][0] == -1
alice._get_this_epoch_assignment(alice_indices[0], epoch)
assert alice.this_epoch_assignment[alice_indices[0]][0] == epoch
def create_mock_signed_attestations_at_slot(
state: BeaconState,
config: Eth2Config,
state_machine: BaseBeaconStateMachine,
attestation_slot: Slot,
beacon_block_root: Hash32,
keymap: Dict[BLSPubkey, int],
voted_attesters_ratio: float = 1.0) -> Iterable[Attestation]:
"""
Create the mocking attestations of the given ``attestation_slot`` slot with ``keymap``.
"""
crosslink_committees_at_slot = get_crosslink_committees_at_slot(
state,
attestation_slot,
config,
)
# Get `target_root`
target_root = _get_target_root(state, config, beacon_block_root)
target_epoch = slot_to_epoch(
state.slot,
config.SLOTS_PER_EPOCH,
)
for crosslink_committee in crosslink_committees_at_slot:
committee, shard = crosslink_committee
parent_crosslink = state.current_crosslinks[shard]
attestation_data = AttestationData(
beacon_block_root=beacon_block_root,
source_epoch=state.current_justified_epoch,
source_root=state.current_justified_root,
target_root=target_root,
target_epoch=target_epoch,
crosslink=Crosslink(
shard=shard,
parent_root=parent_crosslink.root,
start_epoch=parent_crosslink.end_epoch,
end_epoch=min(
target_epoch, parent_crosslink.end_epoch +
config.MAX_EPOCHS_PER_CROSSLINK),
))
num_voted_attesters = int(len(committee) * voted_attesters_ratio)
yield _create_mock_signed_attestation(
state,
attestation_data,
attestation_slot,
committee,
num_voted_attesters,
keymap,
config.SLOTS_PER_EPOCH,
)
async def test_validator_propose_or_skip_block(event_loop, event_bus,
monkeypatch):
alice, bob = await get_linked_validators(event_loop=event_loop,
event_bus=event_bus)
state_machine = alice.chain.get_state_machine()
state = state_machine.state
# test: `propose_or_skip_block` should call `propose_block` if the validator get selected
def is_alice_selected(proposer_index):
return proposer_index in alice.validator_privkeys
slot_to_propose, index = _get_slot_with_validator_selected(
is_desired_proposer_index=is_alice_selected,
start_slot=state.slot + 1,
state=state,
state_machine=state_machine,
)
alice.latest_proposed_epoch = slot_to_epoch(slot_to_propose,
alice.slots_per_epoch) - 1
is_proposing = None
def propose_block(proposer_index, slot, state, state_machine, head_block):
nonlocal is_proposing
is_proposing = True
def skip_block(slot, state, state_machine):
nonlocal is_proposing
is_proposing = False
monkeypatch.setattr(alice, 'propose_block', propose_block)
monkeypatch.setattr(alice, 'skip_block', skip_block)
await alice.propose_or_skip_block(slot_to_propose, False)
assert is_proposing
is_proposing = None
# test: `propose_or_skip_block` should call `skip_block`.
def is_not_alice_bob_selected(proposer_index):
return (proposer_index not in alice.validator_privkeys
and proposer_index not in bob.validator_privkeys)
slot_to_skip, index = _get_slot_with_validator_selected(
is_desired_proposer_index=is_not_alice_bob_selected,
start_slot=state.slot + 1,
state=state,
state_machine=state_machine,
)
await alice.propose_or_skip_block(slot_to_skip, is_second_tick=False)
assert is_proposing is None, "`skip_block` should not be called if `is_second_tick == False`"
await alice.propose_or_skip_block(slot_to_skip, is_second_tick=True)
assert is_proposing is False, "`skip_block` should have been called"
async def handle_first_tick(self, slot: Slot) -> None:
head = self.chain.get_canonical_head()
state_machine = self.chain.get_state_machine()
state = state_machine.state
self.logger.debug(
# Align with debug log below
bold_green("Head epoch=%s slot=%s state_root=%s"),
state.current_epoch(self.slots_per_epoch),
head.slot,
encode_hex(head.state_root),
)
self.logger.debug(
bold_green("Justified epoch=%s root=%s (current)"),
state.current_justified_epoch,
encode_hex(state.current_justified_root),
)
self.logger.debug(
bold_green("Justified epoch=%s root=%s (previous)"),
state.previous_justified_epoch,
encode_hex(state.previous_justified_root),
)
self.logger.debug(
bold_green("Finalized epoch=%s root=%s"),
state.finalized_epoch,
encode_hex(state.finalized_root),
)
self.logger.debug(
bold_green("current_epoch_attestations %s"),
state.current_epoch_attestations,
)
self.logger.debug(
bold_green("previous_epoch_attestations %s"),
state.previous_epoch_attestations,
)
proposer_index = _get_proposer_index(
state,
slot,
state_machine.config,
)
# `latest_proposed_epoch` is used to prevent validator from erraneously proposing twice
# in the same epoch due to service crashing.
epoch = slot_to_epoch(slot, self.slots_per_epoch)
if proposer_index in self.validator_privkeys:
has_proposed = epoch <= self.latest_proposed_epoch[proposer_index]
if not has_proposed:
self.propose_block(
proposer_index=proposer_index,
slot=slot,
state=state,
state_machine=state_machine,
head_block=head,
)
self.latest_proposed_epoch[proposer_index] = epoch
def _corrupt_signature(slots_per_epoch, params, fork):
message_hash = b'\x12' * 32
privkey = 42
domain_type = SignatureDomain.DOMAIN_ATTESTATION
domain = get_domain(
fork=fork,
epoch=slot_to_epoch(params["data"].slot, slots_per_epoch),
domain_type=domain_type,
)
corrupt_signature = bls.sign(message_hash, privkey, domain)
return assoc(params, "aggregate_signature", corrupt_signature)
def sign_attestation(message: bytes, privkey: int, fork: Fork,
slot: SlotNumber, epoch_length: int) -> BLSSignature:
domain = get_domain(
fork,
slot_to_epoch(slot, epoch_length),
SignatureDomain.DOMAIN_ATTESTATION,
)
return bls.sign(
message=message,
privkey=privkey,
domain=domain,
)
def validate_attestation_aggregate_signature(state: BeaconState,
attestation: Attestation,
genesis_epoch: EpochNumber,
epoch_length: int,
target_committee_size: int,
shard_count: int) -> None:
"""
Validate ``aggregate_signature`` field of ``attestation``.
Raise ``ValidationError`` if it's invalid.
Note: This is the phase 0 version of `aggregate_signature`` validation.
All proof of custody bits are assumed to be 0 within the signed data.
This will change to reflect real proof of custody bits in the Phase 1.
"""
participant_indices = get_attestation_participants(
state=state,
attestation_data=attestation.data,
bitfield=attestation.aggregation_bitfield,
genesis_epoch=genesis_epoch,
epoch_length=epoch_length,
target_committee_size=target_committee_size,
shard_count=shard_count,
)
pubkeys = tuple(
state.validator_registry[validator_index].pubkey
for validator_index in participant_indices
)
group_public_key = bls.aggregate_pubkeys(pubkeys)
# TODO: change to tree hashing when we have SSZ
message = AttestationDataAndCustodyBit.create_attestation_message(attestation.data)
domain = get_domain(
fork=state.fork,
epoch=slot_to_epoch(attestation.data.slot, epoch_length),
domain_type=SignatureDomain.DOMAIN_ATTESTATION,
)
is_valid_signature = bls.verify(
message=message,
pubkey=group_public_key,
signature=attestation.aggregate_signature,
domain=domain,
)
if not is_valid_signature:
raise ValidationError(
"Attestation aggregate_signature is invalid. "
"message={}, participant_indices={} "
"domain={}".format(
message,
participant_indices,
domain,
)
)
def _corrupt_signature(epoch_length, params, fork):
message = bytes.fromhex("deadbeefcafe")
privkey = 42
domain_type = SignatureDomain.DOMAIN_ATTESTATION
domain = get_domain(
fork=fork,
epoch=slot_to_epoch(params["data"].slot, epoch_length),
domain_type=domain_type,
)
corrupt_signature = bls.sign(message, privkey, domain)
return assoc(params, "aggregate_signature", corrupt_signature)
def sign_transaction(*, message_hash: Hash32, privkey: int, fork: Fork,
slot: Slot, signature_domain: SignatureDomain,
slots_per_epoch: int) -> BLSSignature:
domain = get_domain(
fork,
slot_to_epoch(slot, slots_per_epoch),
signature_domain,
)
return bls.sign(
message_hash=message_hash,
privkey=privkey,
domain=domain,
)
def sign_proof_of_possession(deposit_input: DepositInput, privkey: int,
fork: Fork, slot: Slot,
slots_per_epoch: int) -> BLSSignature:
domain = get_domain(
fork,
slot_to_epoch(slot, slots_per_epoch),
SignatureDomain.DOMAIN_DEPOSIT,
)
return bls.sign(
message_hash=deposit_input.root,
privkey=privkey,
domain=domain,
)
def _find_latest_attestation_targets(
state: BeaconState, store: Store,
config: Eth2Config) -> Iterable[AttestationTarget]:
epoch = slot_to_epoch(state.slot, config.SLOTS_PER_EPOCH)
active_validators = get_active_validator_indices(
state.validators,
epoch,
)
return filter(
second, map(
_find_latest_attestation_target(store),
active_validators,
))
def sign_transaction(*, message_hash: Hash32, privkey: int, state: BeaconState,
slot: Slot, signature_domain: SignatureDomain,
slots_per_epoch: int) -> BLSSignature:
domain = get_domain(
state,
signature_domain,
slots_per_epoch,
message_epoch=slot_to_epoch(slot, slots_per_epoch),
)
return bls.sign(
message_hash=message_hash,
privkey=privkey,
domain=domain,
)
def _get_target_root(state: BeaconState, config: Eth2Config,
beacon_block_root: Hash32) -> Hash32:
epoch_start_slot = get_epoch_start_slot(
slot_to_epoch(state.slot, config.SLOTS_PER_EPOCH),
config.SLOTS_PER_EPOCH,
)
if epoch_start_slot == state.slot:
return beacon_block_root
else:
return get_block_root(
state,
epoch_start_slot,
config.SLOTS_PER_HISTORICAL_ROOT,
)
