From b27fd5adab3a79a4db038950c657ef5c1d3bbaa1 Mon Sep 17 00:00:00 2001 From: anshalshukla Date: Thu, 18 Dec 2025 15:08:13 +0530 Subject: [PATCH 01/12] feat: add signature aggregation using python bindings --- .../testing/src/consensus_testing/keys.py | 51 +++++-- pyproject.toml | 7 +- .../subspecs/containers/block/block.py | 34 +++-- .../subspecs/containers/block/types.py | 15 +- src/lean_spec/subspecs/forkchoice/store.py | 15 +- src/lean_spec/subspecs/xmss/aggregation.py | 132 ++++++++++++++++++ src/lean_spec/types/byte_arrays.py | 6 + 7 files changed, 214 insertions(+), 46 deletions(-) create mode 100644 src/lean_spec/subspecs/xmss/aggregation.py diff --git a/packages/testing/src/consensus_testing/keys.py b/packages/testing/src/consensus_testing/keys.py index 0dad9b0f..89b092be 100644 --- a/packages/testing/src/consensus_testing/keys.py +++ b/packages/testing/src/consensus_testing/keys.py @@ -30,14 +30,15 @@ from typing import TYPE_CHECKING, Iterator, Self from lean_spec.subspecs.containers import AttestationData -from lean_spec.subspecs.containers.attestation.types import NaiveAggregatedSignature from lean_spec.subspecs.containers.block.types import ( AggregatedAttestations, AttestationSignatures, ) from lean_spec.subspecs.containers.slot import Slot +from lean_spec.subspecs.xmss.aggregation import aggregate_signatures from lean_spec.subspecs.xmss.containers import PublicKey, SecretKey, Signature from lean_spec.subspecs.xmss.interface import TEST_SIGNATURE_SCHEME, GeneralizedXmssScheme +from lean_spec.types.byte_arrays import ByteListMib from lean_spec.types import Uint64 if TYPE_CHECKING: @@ -216,23 +217,43 @@ def build_attestation_signatures( self, aggregated_attestations: AggregatedAttestations, signature_lookup: Mapping[tuple[Uint64, bytes], Signature] | None = None, + payload_lookup: Mapping[bytes, bytes] | None = None, ) -> AttestationSignatures: - """Build `AttestationSignatures` for already-aggregated attestations.""" + """ + Build `AttestationSignatures` for already-aggregated attestations. + + For each aggregated attestation, collect the participating validators' public keys and + signatures, then produce a single leanVM aggregated signature proof blob using + `xmss_aggregate_signatures` (via `aggregate_signatures`). + """ lookup = signature_lookup or {} - return AttestationSignatures( - data=[ - NaiveAggregatedSignature( - data=[ - ( - lookup.get((vid, agg.data.data_root_bytes())) - or self.sign_attestation_data(vid, agg.data) - ) - for vid in agg.aggregation_bits.to_validator_indices() - ] - ) - for agg in aggregated_attestations + + proof_blobs: list[ByteListMib] = [] + for agg in aggregated_attestations: + validator_ids = agg.aggregation_bits.to_validator_indices() + message = agg.data.data_root_bytes() + epoch = agg.data.slot + + if payload_lookup is not None and message in payload_lookup: + proof_blobs.append(ByteListMib(data=payload_lookup[message])) + continue + + public_keys: list[PublicKey] = [self.get_public_key(vid) for vid in validator_ids] + signatures: list[Signature] = [ + (lookup.get((vid, message)) or self.sign_attestation_data(vid, agg.data)) + for vid in validator_ids ] - ) + + # If the caller supplied raw signatures and any are invalid, aggregation should fail with exception. + payload = aggregate_signatures( + public_keys=public_keys, + signatures=signatures, + message=message, + epoch=epoch, + ) + proof_blobs.append(ByteListMib(data=payload)) + + return AttestationSignatures(data=proof_blobs) def _generate_single_keypair(num_epochs: int) -> dict[str, str]: diff --git a/pyproject.toml b/pyproject.toml index ec08c110..2412196e 100644 --- a/pyproject.toml +++ b/pyproject.toml @@ -26,7 +26,11 @@ classifiers = [ "Programming Language :: Python :: 3.14", ] requires-python = ">=3.12" -dependencies = ["pydantic>=2.12.0,<3", "typing-extensions>=4.4"] +dependencies = [ + "pydantic>=2.12.0,<3", + "typing-extensions>=4.4", + "lean-multisig>=0.1.0", +] [project.license] file = "LICENSE" @@ -118,6 +122,7 @@ test = [ "pytest-xdist>=3.6.1,<4", "hypothesis>=6.138.14", "lean-ethereum-testing", + "lean-multisig>=0.1.0", ] lint = [ "ty>=0.0.1a34", diff --git a/src/lean_spec/subspecs/containers/block/block.py b/src/lean_spec/subspecs/containers/block/block.py index 091eacb5..695cea28 100644 --- a/src/lean_spec/subspecs/containers/block/block.py +++ b/src/lean_spec/subspecs/containers/block/block.py @@ -106,11 +106,10 @@ class BlockSignatures(Container): """Attestation signatures for the aggregated attestations in the block body. Each entry corresponds to an aggregated attestation from the block body and - contains all XMSS signatures from the participating validators. + contains the leanVM aggregated signature proof bytes for the participating validators. TODO: - - Currently, this is list of lists of signatures. - - The list of signatures will be replaced by a BytesArray to include leanVM aggregated proof. + - Eventually this field will be replaced by a single SNARK aggregating *all* signatures. """ proposer_signature: XmssSignature @@ -168,28 +167,33 @@ def verify_signatures(self, parent_state: "State") -> bool: validators = parent_state.validators + from lean_spec.subspecs.xmss.aggregation import ( + LeanMultisigError, + verify_aggregated_payload, + ) + for aggregated_attestation, aggregated_signature in zip( aggregated_attestations, attestation_signatures, strict=True ): validator_ids = aggregated_attestation.aggregation_bits.to_validator_indices() - assert len(aggregated_signature) == len(validator_ids), ( - "Aggregated attestation signature count mismatch" - ) - attestation_root = aggregated_attestation.data.data_root_bytes() - # Verify each validator's attestation signature - for validator_id, signature in zip(validator_ids, aggregated_signature, strict=True): + # Verify the leanVM aggregated proof for this attestation + for validator_id in validator_ids: # Ensure validator exists in the active set assert validator_id < Uint64(len(validators)), "Validator index out of range" - validator = validators[validator_id] - assert signature.verify( - validator.get_pubkey(), - aggregated_attestation.data.slot, - attestation_root, - ), "Attestation signature verification failed" + public_keys = [validators[vid].get_pubkey() for vid in validator_ids] + try: + verify_aggregated_payload( + public_keys=public_keys, + payload=bytes(aggregated_signature), + message=attestation_root, + epoch=aggregated_attestation.data.slot, + ) + except LeanMultisigError as exc: + raise AssertionError("Attestation aggregated signature verification failed") from exc # Verify proposer attestation signature proposer_attestation = self.message.proposer_attestation diff --git a/src/lean_spec/subspecs/containers/block/types.py b/src/lean_spec/subspecs/containers/block/types.py index d939f562..5d51e343 100644 --- a/src/lean_spec/subspecs/containers/block/types.py +++ b/src/lean_spec/subspecs/containers/block/types.py @@ -1,9 +1,10 @@ """Block-specific SSZ types for the Lean Ethereum consensus specification.""" from lean_spec.types import SSZList +from lean_spec.types.byte_arrays import ByteListMib from ...chain.config import VALIDATOR_REGISTRY_LIMIT -from ..attestation import AggregatedAttestation, AttestationData, NaiveAggregatedSignature +from ..attestation import AggregatedAttestation, AttestationData class AggregatedAttestations(SSZList[AggregatedAttestation]): @@ -22,8 +23,14 @@ def has_duplicate_data(self) -> bool: return False -class AttestationSignatures(SSZList[NaiveAggregatedSignature]): - """List of per-attestation naive signature lists aligned with block body attestations.""" +class AttestationSignatures(SSZList[ByteListMib]): + """ + List of per-attestation aggregated signature proof blobs. - ELEMENT_TYPE = NaiveAggregatedSignature + Each entry corresponds to an aggregated attestation from the block body and contains + the raw bytes of the leanVM XMSSAggregatedSignature proof produced by + `xmss_aggregate_signatures`. + """ + + ELEMENT_TYPE = ByteListMib LIMIT = int(VALIDATOR_REGISTRY_LIMIT) diff --git a/src/lean_spec/subspecs/forkchoice/store.py b/src/lean_spec/subspecs/forkchoice/store.py index b7db68c5..c1304d85 100644 --- a/src/lean_spec/subspecs/forkchoice/store.py +++ b/src/lean_spec/subspecs/forkchoice/store.py @@ -458,27 +458,20 @@ def on_block(self, signed_block_with_attestation: SignedBlockWithAttestation) -> # Process block body attestations. aggregated_attestations = signed_block_with_attestation.message.block.body.attestations - attestation_signatures = signed_block_with_attestation.signature.attestation_signatures assert len(aggregated_attestations) == len(attestation_signatures), ( "Attestation signature groups must match aggregated attestations" ) - for aggregated_attestation, aggregated_signature in zip( - aggregated_attestations, attestation_signatures, strict=True - ): + for aggregated_attestation in aggregated_attestations: validator_ids = aggregated_attestation.aggregation_bits.to_validator_indices() - - assert len(validator_ids) == len(aggregated_signature), ( - "Aggregated attestation signature count mismatch" - ) - - for validator_id, signature in zip(validator_ids, aggregated_signature, strict=True): + for validator_id in validator_ids: + # Signature bytes are not needed for forkchoice once the block-level + # aggregated proof has been verified. store = store.on_attestation( signed_attestation=SignedAttestation( validator_id=validator_id, message=aggregated_attestation.data, - signature=signature, ), is_from_block=True, ) diff --git a/src/lean_spec/subspecs/xmss/aggregation.py b/src/lean_spec/subspecs/xmss/aggregation.py new file mode 100644 index 00000000..6c59a9b8 --- /dev/null +++ b/src/lean_spec/subspecs/xmss/aggregation.py @@ -0,0 +1,132 @@ +""" +lean-multisig aggregation helpers bridging leanSpec containers to native bindings. + +This module wraps the Python bindings exposed by the `lean-multisig` project to provide +XMSS signature aggregation + verification. + +The aggregated signatures are stored as raw payload bytes produced by +`lean_multisig.aggregate_signatures`. +""" + +from __future__ import annotations + +from functools import lru_cache +from typing import Sequence + +from lean_spec.subspecs.xmss.containers import PublicKey, Signature +from lean_spec.types import Uint64 + + +class LeanMultisigError(RuntimeError): + """Base exception for lean-multisig aggregation helpers.""" + + +class LeanMultisigUnavailableError(LeanMultisigError): + """Raised when the lean-multisig Python bindings cannot be imported.""" + + +class LeanMultisigAggregationError(LeanMultisigError): + """Raised when lean-multisig fails to aggregate or verify signatures.""" + + +@lru_cache(maxsize=1) +def _import_lean_multisig(): + try: + import lean_multisig # type: ignore + except ModuleNotFoundError as exc: # pragma: no cover - import is environment-specific + raise LeanMultisigUnavailableError( + "lean-multisig bindings are required. Install them with `uv pip install lean-multisig` " + "(or your local editable install) from the leanSpec repository." + ) from exc + return lean_multisig + + +@lru_cache(maxsize=1) +def _ensure_prover_setup() -> None: + """Run the (expensive) prover setup routine exactly once.""" + _import_lean_multisig().setup_prover() + + +@lru_cache(maxsize=1) +def _ensure_verifier_setup() -> None: + """Run the verifier setup routine exactly once.""" + _import_lean_multisig().setup_verifier() + + +def _coerce_epoch(epoch: int | Uint64) -> int: + value = int(epoch) + if value < 0 or value >= 2**32: + raise ValueError("epoch must fit in uint32 for lean-multisig aggregation") + return value + + +def aggregate_signatures( + public_keys: Sequence[PublicKey], + signatures: Sequence[Signature], + message: bytes, + epoch: int | Uint64, +) -> bytes: + """ + Aggregate XMSS signatures using lean-multisig. + + Args: + public_keys: Public keys of the signers, one per signature. + signatures: Individual XMSS signatures to aggregate. + message: The 32-byte message that was signed. + epoch: The epoch in which the signatures were created. + + Returns: + Raw bytes of the aggregated signature payload. + + Raises: + LeanMultisigError: If lean-multisig is unavailable or aggregation fails. + """ + lean_multisig = _import_lean_multisig() + _ensure_prover_setup() + try: + # `lean_multisig` expects serialized keys/signatures as raw bytes. + # We use leanSpec's SSZ encoding for these containers. + pub_keys_bytes = [pk.encode_bytes() for pk in public_keys] + sig_bytes = [sig.encode_bytes() for sig in signatures] + + aggregated_bytes = lean_multisig.aggregate_signatures( + pub_keys_bytes, + sig_bytes, + message, + _coerce_epoch(epoch), + ) + return aggregated_bytes + except Exception as exc: + raise LeanMultisigAggregationError(f"lean-multisig aggregation failed: {exc}") from exc + + +def verify_aggregated_payload( + public_keys: Sequence[PublicKey], + payload: bytes, + message: bytes, + epoch: int | Uint64, +) -> None: + """ + Verify a lean-multisig aggregated signature payload. + + Args: + public_keys: Public keys of the signers, one per original signature. + payload: Raw bytes of the aggregated signature payload. + message: The 32-byte message that was signed. + epoch: The epoch in which the signatures were created. + + Raises: + LeanMultisigError: If lean-multisig is unavailable or verification fails. + """ + lean_multisig = _import_lean_multisig() + _ensure_verifier_setup() + try: + pub_keys_bytes = [pk.encode_bytes() for pk in public_keys] + lean_multisig.verify_aggregated_signatures( + pub_keys_bytes, + message, + payload, + _coerce_epoch(epoch), + ) + except Exception as exc: + raise LeanMultisigAggregationError(f"lean-multisig verification failed: {exc}") from exc diff --git a/src/lean_spec/types/byte_arrays.py b/src/lean_spec/types/byte_arrays.py index 5a360085..0fc4cc0b 100644 --- a/src/lean_spec/types/byte_arrays.py +++ b/src/lean_spec/types/byte_arrays.py @@ -383,3 +383,9 @@ class ByteList2048(BaseByteList): """Variable-length byte list with a limit of 2048 bytes.""" LIMIT = 2048 + + +class ByteListMib(BaseByteList): + """Variable-length byte list with a limit of 1048576 bytes.""" + + LIMIT = 1024 * 1024 From b641de975eeb5108f995b01586b332160e36a18e Mon Sep 17 00:00:00 2001 From: harkamal Date: Thu, 18 Dec 2025 22:59:33 +0530 Subject: [PATCH 02/12] add highlevel modified flow for attestation import and proposal packing --- .../subspecs/containers/state/state.py | 19 ++++--- src/lean_spec/subspecs/forkchoice/store.py | 51 ++++++++++++++----- 2 files changed, 49 insertions(+), 21 deletions(-) diff --git a/src/lean_spec/subspecs/containers/state/state.py b/src/lean_spec/subspecs/containers/state/state.py index 28f0f13c..bc6fc0d1 100644 --- a/src/lean_spec/subspecs/containers/state/state.py +++ b/src/lean_spec/subspecs/containers/state/state.py @@ -626,7 +626,7 @@ def build_block( proposer_index: Uint64, parent_root: Bytes32, attestations: list[Attestation] | None = None, - available_signed_attestations: Iterable[SignedAttestation] | None = None, + available_attestations: Iterable[Attestation] | None = None, known_block_roots: AbstractSet[Bytes32] | None = None, ) -> tuple[Block, "State", list[Attestation], list["Signature"]]: """ @@ -684,12 +684,15 @@ def build_block( new_attestations: list[Attestation] = [] new_signatures: list[Signature] = [] - for signed_attestation in available_signed_attestations: - data = signed_attestation.message - attestation = Attestation( - validator_id=signed_attestation.validator_id, - data=data, - ) + for attestation in available_attestations: + data = attestation.message + validator_id = attestation.validator_id + # 1. check if the signature for this validator id and data is in the XMSS signature map + # if not then skip the attestation because we don't have recursive aggregation yet + # TODO: add the skip + + # 2. if XMSS signature found, then get the signature + # TODO: signature = # Skip if target block is unknown if data.head.root not in known_block_roots: @@ -702,7 +705,7 @@ def build_block( # Add attestation if not already included if attestation not in attestations: new_attestations.append(attestation) - new_signatures.append(signed_attestation.signature) + new_signatures.append(signature) # Fixed point reached: no new attestations found if not new_attestations: diff --git a/src/lean_spec/subspecs/forkchoice/store.py b/src/lean_spec/subspecs/forkchoice/store.py index c1304d85..dd3785c3 100644 --- a/src/lean_spec/subspecs/forkchoice/store.py +++ b/src/lean_spec/subspecs/forkchoice/store.py @@ -196,7 +196,7 @@ def get_forkchoice_store(cls, state: State, anchor_block: Block) -> "Store": states={anchor_root: copy.copy(state)}, ) - def validate_attestation(self, signed_attestation: SignedAttestation) -> None: + def validate_attestation(self, attestation: Attestation) -> None: """ Validate incoming attestation before processing. @@ -211,7 +211,7 @@ def validate_attestation(self, signed_attestation: SignedAttestation) -> None: Raises: AssertionError: If attestation fails validation. """ - data = signed_attestation.message + data = attestation.message # Availability Check # @@ -239,10 +239,30 @@ def validate_attestation(self, signed_attestation: SignedAttestation) -> None: # We allow a small margin for clock disparity (1 slot), but no further. current_slot = Slot(self.time // SECONDS_PER_SLOT) assert data.slot <= current_slot + Slot(1), "Attestation too far in future" + + def on_gossip_attestation( + self, + signed_attestation: SignedAttestation, + ) -> "Store": + # 1. Validate the xmss signature here + # TODO + + # 2. save validator_id, data => SignedAttestation + # actually we only need to store the signature in the XMSS map not the SignedAttestation + # TODO + + # 3. process attestation + self.on_attestation( + attestation = Attestation( + validator_id=signed_attestation.validator_id + message=signed_attestation.message + ), + is_from_block= False) + def on_attestation( self, - signed_attestation: SignedAttestation, + attestation: Attestation, is_from_block: bool = False, ) -> "Store": """ @@ -290,14 +310,14 @@ def on_attestation( A new Store with updated attestation sets. """ # First, ensure the attestation is structurally and temporally valid. - self.validate_attestation(signed_attestation) + self.validate_attestation(attestation) # Extract the validator index that produced this attestation. - validator_id = Uint64(signed_attestation.validator_id) + validator_id = Uint64(attestation.validator_id) # Extract the attestation's slot: # - used to decide if this attestation is "newer" than a previous one. - attestation_slot = signed_attestation.message.slot + attestation_slot = attestation.message.slot # Copy the known attestation map: # - we build a new Store immutably, @@ -322,7 +342,7 @@ def on_attestation( # - there is no known attestation yet, or # - this attestation is from a later slot than the known one. if latest_known is None or latest_known.message.slot < attestation_slot: - new_known[validator_id] = signed_attestation + new_known[validator_id] = attestation # Fetch any pending ("new") attestation for this validator. existing_new = new_new.get(validator_id) @@ -356,7 +376,7 @@ def on_attestation( # - there is no pending attestation yet, or # - this one is from a later slot than the pending one. if latest_new is None or latest_new.message.slot < attestation_slot: - new_new[validator_id] = signed_attestation + new_new[validator_id] = attestation # Return a new Store with updated "known" and "new" attestation maps. return self.model_copy( @@ -466,10 +486,15 @@ def on_block(self, signed_block_with_attestation: SignedBlockWithAttestation) -> for aggregated_attestation in aggregated_attestations: validator_ids = aggregated_attestation.aggregation_bits.to_validator_indices() for validator_id in validator_ids: - # Signature bytes are not needed for forkchoice once the block-level - # aggregated proof has been verified. - store = store.on_attestation( - signed_attestation=SignedAttestation( + # 1. Store the (attestation bits, signtaure) against (validator_id, data) in the LeanAggregatedSignaturesListMap + # its a list because same validator id with the same data can show up in multiple + # aggregated attestations specially when we have the aggregator roles, and this list + # can be recursively aggregated by the block proposer if such data is picked to be packed + # into the block + + # 2. import just the attestation into forkchoice for latest votes + is_updated = store.on_attestation( + attestation=Attestation( validator_id=validator_id, message=aggregated_attestation.data, ), @@ -968,7 +993,7 @@ def produce_block_with_signatures( slot=slot, proposer_index=validator_index, parent_root=head_root, - available_signed_attestations=store.latest_known_attestations.values(), + available_attestations=store.latest_known_attestations.values(), known_block_roots=set(store.blocks.keys()), ) From c4118150573d6a5383c5c232cd85988cc91f7ef3 Mon Sep 17 00:00:00 2001 From: anshalshukla Date: Sat, 20 Dec 2025 16:34:52 +0530 Subject: [PATCH 03/12] feat: update containers to handle attestation instead of signedAttestations --- .../testing/src/consensus_testing/keys.py | 8 +- .../subspecs/containers/block/types.py | 6 +- .../subspecs/containers/state/state.py | 45 ++++- src/lean_spec/subspecs/forkchoice/store.py | 188 +++++++++++++----- src/lean_spec/types/byte_arrays.py | 2 +- .../forkchoice/test_store_attestations.py | 27 ++- 6 files changed, 197 insertions(+), 79 deletions(-) diff --git a/packages/testing/src/consensus_testing/keys.py b/packages/testing/src/consensus_testing/keys.py index ecaf79e1..cf313c55 100755 --- a/packages/testing/src/consensus_testing/keys.py +++ b/packages/testing/src/consensus_testing/keys.py @@ -48,7 +48,7 @@ from lean_spec.subspecs.xmss.aggregation import aggregate_signatures from lean_spec.subspecs.xmss.containers import PublicKey, SecretKey, Signature from lean_spec.subspecs.xmss.interface import TEST_SIGNATURE_SCHEME, GeneralizedXmssScheme -from lean_spec.types.byte_arrays import ByteListMib +from lean_spec.types.byte_arrays import LeanAggregatedSignature from lean_spec.subspecs.xmss.interface import ( PROD_SIGNATURE_SCHEME, TEST_SIGNATURE_SCHEME, @@ -321,14 +321,14 @@ def build_attestation_signatures( """ lookup = signature_lookup or {} - proof_blobs: list[ByteListMib] = [] + proof_blobs: list[LeanAggregatedSignature] = [] for agg in aggregated_attestations: validator_ids = agg.aggregation_bits.to_validator_indices() message = agg.data.data_root_bytes() epoch = agg.data.slot if payload_lookup is not None and message in payload_lookup: - proof_blobs.append(ByteListMib(data=payload_lookup[message])) + proof_blobs.append(LeanAggregatedSignature(data=payload_lookup[message])) continue public_keys: list[PublicKey] = [self.get_public_key(vid) for vid in validator_ids] @@ -344,7 +344,7 @@ def build_attestation_signatures( message=message, epoch=epoch, ) - proof_blobs.append(ByteListMib(data=payload)) + proof_blobs.append(LeanAggregatedSignature(data=payload)) return AttestationSignatures(data=proof_blobs) diff --git a/src/lean_spec/subspecs/containers/block/types.py b/src/lean_spec/subspecs/containers/block/types.py index 5d51e343..807942c3 100644 --- a/src/lean_spec/subspecs/containers/block/types.py +++ b/src/lean_spec/subspecs/containers/block/types.py @@ -1,7 +1,7 @@ """Block-specific SSZ types for the Lean Ethereum consensus specification.""" from lean_spec.types import SSZList -from lean_spec.types.byte_arrays import ByteListMib +from lean_spec.types.byte_arrays import LeanAggregatedSignature from ...chain.config import VALIDATOR_REGISTRY_LIMIT from ..attestation import AggregatedAttestation, AttestationData @@ -23,7 +23,7 @@ def has_duplicate_data(self) -> bool: return False -class AttestationSignatures(SSZList[ByteListMib]): +class AttestationSignatures(SSZList[LeanAggregatedSignature]): """ List of per-attestation aggregated signature proof blobs. @@ -32,5 +32,5 @@ class AttestationSignatures(SSZList[ByteListMib]): `xmss_aggregate_signatures`. """ - ELEMENT_TYPE = ByteListMib + ELEMENT_TYPE = LeanAggregatedSignature LIMIT = int(VALIDATOR_REGISTRY_LIMIT) diff --git a/src/lean_spec/subspecs/containers/state/state.py b/src/lean_spec/subspecs/containers/state/state.py index bc6fc0d1..96da3e23 100644 --- a/src/lean_spec/subspecs/containers/state/state.py +++ b/src/lean_spec/subspecs/containers/state/state.py @@ -12,7 +12,8 @@ is_proposer, ) -from ..attestation import AggregatedAttestation, Attestation, SignedAttestation +from ..attestation import AggregatedAttestation, Attestation +from lean_spec.types.byte_arrays import LeanAggregatedSignature if TYPE_CHECKING: from lean_spec.subspecs.xmss.containers import Signature @@ -628,25 +629,32 @@ def build_block( attestations: list[Attestation] | None = None, available_attestations: Iterable[Attestation] | None = None, known_block_roots: AbstractSet[Bytes32] | None = None, + gossip_attestation_signatures: dict[tuple[Uint64, bytes], "Signature"] | None = None, + block_attestation_signatures: dict[tuple[Uint64, bytes], list[LeanAggregatedSignature]] | None = None, ) -> tuple[Block, "State", list[Attestation], list["Signature"]]: """ Build a valid block on top of this state. Computes the post-state and creates a block with the correct state root. - If `available_signed_attestations` and `known_block_roots` are provided, + If `available_attestations` and `known_block_roots` are provided, performs fixed-point attestation collection: iteratively adds valid attestations until no more can be included. This is necessary because processing attestations may update the justified checkpoint, which may make additional attestations valid. + Signatures are looked up from the provided signature maps using + (validator_id, attestation_data_root) as the key. + Args: slot: Target slot for the block. proposer_index: Validator index of the proposer. parent_root: Root of the parent block. attestations: Initial attestations to include. - available_signed_attestations: Pool of attestations to collect from. + available_attestations: Pool of attestations to collect from. known_block_roots: Set of known block roots for attestation validation. + gossip_attestation_signatures: Map of (validator_id, data_root) to XMSS signatures. + block_attestation_signatures: Map of (validator_id, data_root) to aggregated signature payloads. Returns: Tuple of (Block, post-State, collected attestations, signatures). @@ -677,7 +685,7 @@ def build_block( post_state = self.process_slots(slot).process_block(candidate_block) # No attestation source provided: done after computing post_state - if available_signed_attestations is None or known_block_roots is None: + if available_attestations is None or known_block_roots is None: break # Find new valid attestations matching post-state justification @@ -685,14 +693,29 @@ def build_block( new_signatures: list[Signature] = [] for attestation in available_attestations: - data = attestation.message + data = attestation.data validator_id = attestation.validator_id - # 1. check if the signature for this validator id and data is in the XMSS signature map - # if not then skip the attestation because we don't have recursive aggregation yet - # TODO: add the skip - - # 2. if XMSS signature found, then get the signature - # TODO: signature = + data_root = data.data_root_bytes() + + # Check if we have a signature for this (validator_id, data_root) + # First check gossip signatures, then block signatures (first entry if available) + signature = None + if gossip_attestation_signatures: + signature = gossip_attestation_signatures.get((validator_id, data_root)) + + # If not found in gossip and block signatures available, try those + # Note: For now, we only use block signatures if gossip signature not found + # TODO: Implement recursive aggregation to combine multiple aggregated signatures + if signature is None and block_attestation_signatures: + aggregated_sigs = block_attestation_signatures.get((validator_id, data_root)) + if aggregated_sigs: + # For now, skip if only aggregated signatures available + # because we don't have recursive aggregation yet + continue + + # Skip if no signature found + if signature is None: + continue # Skip if target block is unknown if data.head.root not in known_block_roots: diff --git a/src/lean_spec/subspecs/forkchoice/store.py b/src/lean_spec/subspecs/forkchoice/store.py index ece9abc5..ae4b0541 100644 --- a/src/lean_spec/subspecs/forkchoice/store.py +++ b/src/lean_spec/subspecs/forkchoice/store.py @@ -22,6 +22,7 @@ SECONDS_PER_SLOT, ) from lean_spec.subspecs.containers import ( + Attestation, AttestationData, Block, Checkpoint, @@ -40,6 +41,7 @@ Uint64, is_proposer, ) +from lean_spec.types.byte_arrays import LeanAggregatedSignature from lean_spec.types.container import Container @@ -119,21 +121,38 @@ class Store(Container): `Store`'s latest justified and latest finalized checkpoints. """ - latest_known_attestations: Dict[Uint64, SignedAttestation] = {} + latest_known_attestations: Dict[Uint64, AttestationData] = {} """ - Latest signed attestations by validator that have been processed. + Latest attestation data by validator that have been processed. - These attestations are "known" and contribute to fork choice weights. - Keyed by validator index to enforce one attestation per validator. + - Only stores the attestation data, not signatures. """ - latest_new_attestations: Dict[Uint64, SignedAttestation] = {} + latest_new_attestations: Dict[Uint64, AttestationData] = {} """ - Latest signed attestations by validator that are pending processing. + Latest attestation data by validator that are pending processing. - These attestations are "new" and do not yet contribute to fork choice. - They migrate to `latest_known_attestations` via interval ticks. - Keyed by validator index to enforce one attestation per validator. + - Only stores the attestation data, not signatures. + """ + + gossip_attestation_signatures: Dict[tuple[Uint64, bytes], Signature] = {} + """ + Map of validator id and attestation root to the XMSS signature. + """ + + block_attestation_signatures: Dict[tuple[Uint64, bytes], list[LeanAggregatedSignature]] = {} + """ + Aggregated signature payloads for attestations from blocks. + + - Keyed by (validator_id, attestation_data_root). + - Values are lists because same (validator_id, data) can appear in multiple aggregations. + - Used for recursive signature aggregation when building blocks. + - Populated by on_block. """ @classmethod @@ -207,12 +226,12 @@ def validate_attestation(self, attestation: Attestation) -> None: 3. A vote cannot be for a future slot. Args: - signed_attestation: Attestation to validate. + attestation: Attestation to validate (unsigned). Raises: AssertionError: If attestation fails validation. """ - data = attestation.message + data = attestation.data # Availability Check # @@ -244,22 +263,55 @@ def validate_attestation(self, attestation: Attestation) -> None: def on_gossip_attestation( self, signed_attestation: SignedAttestation, + scheme: GeneralizedXmssScheme = TARGET_SIGNATURE_SCHEME, ) -> "Store": - # 1. Validate the xmss signature here - # TODO + """ + Process a signed attestation received via gossip network. + + This method: + 1. Verifies the XMSS signature + 2. Stores the signature in the gossip signature map + 3. Processes the attestation data via on_attestation - # 2. save validator_id, data => SignedAttestation - # actually we only need to store the signature in the XMSS map not the SignedAttestation - # TODO + Args: + signed_attestation: The signed attestation from gossip. + scheme: XMSS signature scheme for verification. - # 3. process attestation - self.on_attestation( - attestation = Attestation( - validator_id=signed_attestation.validator_id - message=signed_attestation.message - ), - is_from_block= False) + Returns: + New Store with attestation processed and signature stored. + + Raises: + ValueError: If validator not found in state. + AssertionError: If signature verification fails. + """ + validator_id = signed_attestation.validator_id + attestation_data = signed_attestation.message + signature = signed_attestation.signature + + if self.states[attestation_data.target.root].validators[validator_id] is None: + raise ValueError("Validator not found in state") + + public_key = self.states[attestation_data.target.root].validators[validator_id].get_pubkey() + + assert signature.verify(public_key, attestation_data.slot, attestation_data.data_root_bytes(), scheme), "Signature verification failed" + + # Store signature for later lookup during block building + new_gossip_sigs = self.gossip_attestation_signatures + new_gossip_sigs[(validator_id, attestation_data.data_root_bytes())] = signature + + # Process the attestation data + store = self.on_attestation( + attestation=Attestation( + validator_id=validator_id, + data=attestation_data, + ), + is_from_block=False, + ) + # Return store with updated signature map + return store.model_copy( + update={"gossip_attestation_signatures": new_gossip_sigs} + ) def on_attestation( self, @@ -269,6 +321,10 @@ def on_attestation( """ Process a new attestation and place it into the correct attestation stage. + This is the core attestation processing logic that updates the attestation + maps used for fork choice. Signatures are handled separately via + on_gossip_attestation and on_block. + Attestations can come from: - a block body (on-chain, `is_from_block=True`), or - the gossip network (off-chain, `is_from_block=False`). @@ -278,12 +334,12 @@ def on_attestation( Attestations always live in exactly one of two dictionaries: Stage 1: latest new attestations - - Holds *pending* attestations that are not yet counted in fork choice. + - Holds *pending* attestation data that is not yet counted in fork choice. - Includes the proposer's attestation for the block they just produced. - Await activation by an interval tick before they influence weights. Stage 2: latest known attestations - - Contains all *active* attestations used by LMD-GHOST. + - Contains all *active* attestation data used by LMD-GHOST. - Updated during interval ticks, which promote new → known. - Directly contributes to fork-choice subtree weights. @@ -301,8 +357,8 @@ def on_attestation( - Only same-validator comparisons result in replacement. Args: - signed_attestation: - The attestation message to ingest. + attestation: + The attestation to ingest (without signature). is_from_block: - True if embedded in a block body (on-chain), - False if from gossip. @@ -316,9 +372,9 @@ def on_attestation( # Extract the validator index that produced this attestation. validator_id = Uint64(attestation.validator_id) - # Extract the attestation's slot: - # - used to decide if this attestation is "newer" than a previous one. - attestation_slot = attestation.message.slot + # Extract the attestation data and slot + attestation_data = attestation.data + attestation_slot = attestation_data.slot # Copy the known attestation map: # - we build a new Store immutably, @@ -342,8 +398,8 @@ def on_attestation( # Update the known attestation for this validator if: # - there is no known attestation yet, or # - this attestation is from a later slot than the known one. - if latest_known is None or latest_known.message.slot < attestation_slot: - new_known[validator_id] = attestation + if latest_known is None or latest_known.slot < attestation_slot: + new_known[validator_id] = attestation_data # Fetch any pending ("new") attestation for this validator. existing_new = new_new.get(validator_id) @@ -353,7 +409,7 @@ def on_attestation( # - it is from an equal or earlier slot than this on-chain attestation. # # In that case, the on-chain attestation supersedes it. - if existing_new is not None and existing_new.message.slot <= attestation_slot: + if existing_new is not None and existing_new.slot <= attestation_slot: del new_new[validator_id] else: # Network gossip attestation processing @@ -376,8 +432,8 @@ def on_attestation( # Update the pending attestation for this validator if: # - there is no pending attestation yet, or # - this one is from a later slot than the pending one. - if latest_new is None or latest_new.message.slot < attestation_slot: - new_new[validator_id] = attestation + if latest_new is None or latest_new.slot < attestation_slot: + new_new[validator_id] = attestation_data # Return a new Store with updated "known" and "new" attestation maps. return self.model_copy( @@ -482,31 +538,46 @@ def on_block( } ) - # Process block body attestations. + # Process block body attestations and their signatures aggregated_attestations = signed_block_with_attestation.message.block.body.attestations + attestation_signatures = signed_block_with_attestation.signature.attestation_signatures assert len(aggregated_attestations) == len(attestation_signatures), ( "Attestation signature groups must match aggregated attestations" ) - for aggregated_attestation in aggregated_attestations: + # Copy the block attestation signatures map for updates + new_block_sigs = store.block_attestation_signatures + + for aggregated_attestation, aggregated_signature in zip( + aggregated_attestations, attestation_signatures, strict=True + ): validator_ids = aggregated_attestation.aggregation_bits.to_validator_indices() + attestation_data = aggregated_attestation.data + data_root = attestation_data.data_root_bytes() + for validator_id in validator_ids: - # 1. Store the (attestation bits, signtaure) against (validator_id, data) in the LeanAggregatedSignaturesListMap - # its a list because same validator id with the same data can show up in multiple - # aggregated attestations specially when we have the aggregator roles, and this list - # can be recursively aggregated by the block proposer if such data is picked to be packed - # into the block - - # 2. import just the attestation into forkchoice for latest votes - is_updated = store.on_attestation( + # Store the aggregated signature payload against (validator_id, data_root) + # This is a list because the same (validator_id, data) can appear in multiple + # aggregated attestations, especially when we have aggregator roles. + # This list can be recursively aggregated by the block proposer. + key = (validator_id, data_root) + if key not in new_block_sigs: + new_block_sigs[key] = [] + new_block_sigs[key].append(bytes(aggregated_signature)) + + # Import the attestation data into forkchoice for latest votes + store = store.on_attestation( attestation=Attestation( validator_id=validator_id, - message=aggregated_attestation.data, + data=attestation_data, ), is_from_block=True, ) + # Update store with new block attestation signatures + store = store.model_copy(update={"block_attestation_signatures": new_block_sigs}) + # Update forkchoice head based on new block and attestations # # IMPORTANT: This must happen BEFORE processing proposer attestation @@ -520,21 +591,28 @@ def on_block( # 1. NOT affect this block's fork choice position (processed as "new") # 2. Be available for inclusion in future blocks # 3. Influence fork choice only after interval 3 (end of slot) + # + # We also store the proposer's signature for potential future block building. + proposer_data_root = proposer_attestation.data.data_root_bytes() + new_gossip_sigs = store.gossip_attestation_signatures + new_gossip_sigs[(proposer_attestation.validator_id, proposer_data_root)] = ( + signed_block_with_attestation.signature.proposer_signature + ) + store = store.on_attestation( - signed_attestation=SignedAttestation( - validator_id=proposer_attestation.validator_id, - message=proposer_attestation.data, - signature=signed_block_with_attestation.signature.proposer_signature, - ), + attestation=proposer_attestation, is_from_block=False, ) + # Update store with proposer signature + store = store.model_copy(update={"gossip_attestation_signatures": new_gossip_sigs}) + return store def _compute_lmd_ghost_head( self, start_root: Bytes32, - attestations: Dict[Uint64, SignedAttestation], + attestations: Dict[Uint64, AttestationData], min_score: int = 0, ) -> Bytes32: """ @@ -558,7 +636,7 @@ def _compute_lmd_ghost_head( Args: start_root: Starting point root (usually latest justified). - attestations: Attestations to consider for fork choice weights. + attestations: Attestation data to consider for fork choice weights. min_score: Minimum attestation count for block inclusion. Returns: @@ -585,8 +663,8 @@ def _compute_lmd_ghost_head( # For every vote, follow the chosen head upward through its ancestors. # # Each visited block accumulates one unit of weight from that validator. - for attestation in attestations.values(): - current_root = attestation.message.head.root + for attestation_data in attestations.values(): + current_root = attestation_data.head.root # Climb towards the anchor while staying inside the known tree. # @@ -994,13 +1072,21 @@ def produce_block_with_signatures( f"Validator {validator_index} is not the proposer for slot {slot}" ) + # Convert AttestationData to Attestation objects for build_block + available_attestations = [ + Attestation(validator_id=validator_id, data=attestation_data) + for validator_id, attestation_data in store.latest_known_attestations.items() + ] + # Build block with fixed-point attestation collection final_block, final_post_state, _, signatures = head_state.build_block( slot=slot, proposer_index=validator_index, parent_root=head_root, - available_attestations=store.latest_known_attestations.values(), + available_attestations=available_attestations, known_block_roots=set(store.blocks.keys()), + gossip_attestation_signatures=store.gossip_attestation_signatures, + block_attestation_signatures=store.block_attestation_signatures, ) # Store block and state immutably diff --git a/src/lean_spec/types/byte_arrays.py b/src/lean_spec/types/byte_arrays.py index 0fc4cc0b..8f513287 100644 --- a/src/lean_spec/types/byte_arrays.py +++ b/src/lean_spec/types/byte_arrays.py @@ -385,7 +385,7 @@ class ByteList2048(BaseByteList): LIMIT = 2048 -class ByteListMib(BaseByteList): +class LeanAggregatedSignature(BaseByteList): """Variable-length byte list with a limit of 1048576 bytes.""" LIMIT = 1024 * 1024 diff --git a/tests/lean_spec/subspecs/forkchoice/test_store_attestations.py b/tests/lean_spec/subspecs/forkchoice/test_store_attestations.py index 04f37fec..626c6a6d 100644 --- a/tests/lean_spec/subspecs/forkchoice/test_store_attestations.py +++ b/tests/lean_spec/subspecs/forkchoice/test_store_attestations.py @@ -51,16 +51,25 @@ def test_on_block_processes_multi_validator_aggregations() -> None: # Producer view knows about attestations from validators 1 and 2 attestation_slot = Slot(1) attestation_data = base_store.produce_attestation_data(attestation_slot) - signed_attestations = { - validator_id: SignedAttestation( - validator_id=validator_id, - message=attestation_data, - signature=key_manager.sign_attestation_data(validator_id, attestation_data), - ) + + # Store attestation data in latest_known_attestations + attestation_data_map = { + validator_id: attestation_data for validator_id in (Uint64(1), Uint64(2)) } + + # Store signatures in gossip_attestation_signatures + data_root = attestation_data.data_root_bytes() + gossip_sigs = { + (validator_id, data_root): key_manager.sign_attestation_data(validator_id, attestation_data) + for validator_id in (Uint64(1), Uint64(2)) + } + producer_store = base_store.model_copy( - update={"latest_known_attestations": signed_attestations} + update={ + "latest_known_attestations": attestation_data_map, + "gossip_attestation_signatures": gossip_sigs, + } ) # For slot 1 with 3 validators: 1 % 3 == 1, so validator 1 is the proposer @@ -107,5 +116,5 @@ def test_on_block_processes_multi_validator_aggregations() -> None: assert Uint64(1) in updated_store.latest_known_attestations assert Uint64(2) in updated_store.latest_known_attestations - assert updated_store.latest_known_attestations[Uint64(1)].message == attestation_data - assert updated_store.latest_known_attestations[Uint64(2)].message == attestation_data + assert updated_store.latest_known_attestations[Uint64(1)] == attestation_data + assert updated_store.latest_known_attestations[Uint64(2)] == attestation_data From e388dcc92841670065149891fdda96575f87981e Mon Sep 17 00:00:00 2001 From: anshalshukla Date: Mon, 22 Dec 2025 02:27:35 +0530 Subject: [PATCH 04/12] fix: ci, add: test aggregation and verification --- .../testing/src/consensus_testing/keys.py | 6 +- .../test_fixtures/fork_choice.py | 69 ++- .../test_fixtures/state_transition.py | 15 + .../test_fixtures/verify_signatures.py | 14 +- .../test_types/store_checks.py | 14 +- pyproject.toml | 5 +- .../subspecs/containers/block/block.py | 4 +- .../subspecs/containers/state/state.py | 231 ++++++-- src/lean_spec/subspecs/forkchoice/store.py | 66 ++- src/lean_spec/subspecs/xmss/aggregation.py | 10 +- .../test_invalid_signatures.py | 147 ++--- .../forkchoice/test_store_attestations.py | 3 +- .../forkchoice/test_time_management.py | 12 +- .../subspecs/forkchoice/test_validator.py | 18 +- uv.lock | 539 +++++++++--------- 15 files changed, 693 insertions(+), 460 deletions(-) diff --git a/packages/testing/src/consensus_testing/keys.py b/packages/testing/src/consensus_testing/keys.py index cf313c55..b53de155 100755 --- a/packages/testing/src/consensus_testing/keys.py +++ b/packages/testing/src/consensus_testing/keys.py @@ -47,14 +47,13 @@ from lean_spec.subspecs.containers.slot import Slot from lean_spec.subspecs.xmss.aggregation import aggregate_signatures from lean_spec.subspecs.xmss.containers import PublicKey, SecretKey, Signature -from lean_spec.subspecs.xmss.interface import TEST_SIGNATURE_SCHEME, GeneralizedXmssScheme -from lean_spec.types.byte_arrays import LeanAggregatedSignature from lean_spec.subspecs.xmss.interface import ( PROD_SIGNATURE_SCHEME, TEST_SIGNATURE_SCHEME, GeneralizedXmssScheme, ) from lean_spec.types import Uint64 +from lean_spec.types.byte_arrays import LeanAggregatedSignature if TYPE_CHECKING: from collections.abc import Mapping @@ -337,7 +336,8 @@ def build_attestation_signatures( for vid in validator_ids ] - # If the caller supplied raw signatures and any are invalid, aggregation should fail with exception. + # If the caller supplied raw signatures and any are invalid, + # aggregation should fail with exception. payload = aggregate_signatures( public_keys=public_keys, signatures=signatures, diff --git a/packages/testing/src/consensus_testing/test_fixtures/fork_choice.py b/packages/testing/src/consensus_testing/test_fixtures/fork_choice.py index f7b2f490..fc1ae270 100644 --- a/packages/testing/src/consensus_testing/test_fixtures/fork_choice.py +++ b/packages/testing/src/consensus_testing/test_fixtures/fork_choice.py @@ -231,7 +231,10 @@ def make_fixture(self) -> ForkChoiceTest: elif isinstance(step, AttestationStep): # Process attestation from gossip (immutable) - store = store.on_attestation(step.attestation, is_from_block=False) + store = store.on_gossip_attestation( + step.attestation, + scheme=LEAN_ENV_TO_SCHEMES[self.lean_env], + ) else: raise ValueError(f"Step {i}: unknown step type {type(step).__name__}") @@ -301,7 +304,12 @@ def _build_block_from_spec( parent_root = self._resolve_parent_root(spec, store, block_registry) # Build attestations from spec - attestations = self._build_attestations_from_spec(spec, store, block_registry, parent_root) + attestations, attestation_signatures = self._build_attestations_from_spec( + spec, store, block_registry, parent_root, key_manager + ) + + gossip_attestation_signatures = dict(store.gossip_attestation_signatures) + gossip_attestation_signatures.update(attestation_signatures) # Use State.build_block for core block building (pure spec logic) parent_state = store.states[parent_root] @@ -310,6 +318,8 @@ def _build_block_from_spec( proposer_index=proposer_index, parent_root=parent_root, attestations=attestations, + gossip_attestation_signatures=gossip_attestation_signatures, + block_attestation_signatures=store.block_attestation_signatures, ) # Create proposer attestation for this block @@ -325,8 +335,9 @@ def _build_block_from_spec( ) # Sign all attestations and the proposer attestation - attestation_signatures = key_manager.build_attestation_signatures( - final_block.body.attestations + attestation_signatures_blob = key_manager.build_attestation_signatures( + final_block.body.attestations, + signature_lookup=attestation_signatures, ) proposer_signature = key_manager.sign_attestation_data( @@ -340,7 +351,7 @@ def _build_block_from_spec( proposer_attestation=proposer_attestation, ), signature=BlockSignatures( - attestation_signatures=attestation_signatures, + attestation_signatures=attestation_signatures_blob, proposer_signature=proposer_signature, ), ) @@ -392,34 +403,38 @@ def _build_attestations_from_spec( store: Store, block_registry: dict[str, Block], parent_root: Bytes32, - ) -> list[Attestation]: - """Build attestations list from BlockSpec.""" + key_manager: XmssKeyManager, + ) -> tuple[list[Attestation], dict[tuple[Uint64, bytes], Signature]]: + """Build attestations list from BlockSpec and their signatures.""" if spec.attestations is None: - return [] + return [], {} parent_state = store.states[parent_root] attestations = [] + signature_lookup: dict[tuple[Uint64, bytes], Signature] = {} for att_spec in spec.attestations: if isinstance(att_spec, SignedAttestationSpec): signed_att = self._build_signed_attestation_from_spec( - att_spec, block_registry, parent_state - ) - attestations.append( - Attestation(validator_id=signed_att.validator_id, data=signed_att.message) + att_spec, block_registry, parent_state, key_manager ) else: - attestations.append( - Attestation(validator_id=att_spec.validator_id, data=att_spec.message) - ) + signed_att = att_spec + + attestation = Attestation(validator_id=signed_att.validator_id, data=signed_att.message) + attestations.append(attestation) + signature_lookup[(attestation.validator_id, attestation.data.data_root_bytes())] = ( + signed_att.signature + ) - return attestations + return attestations, signature_lookup def _build_signed_attestation_from_spec( self, spec: SignedAttestationSpec, block_registry: dict[str, Block], state: State, + key_manager: XmssKeyManager, ) -> SignedAttestation: """ Build a SignedAttestation from a SignedAttestationSpec. @@ -466,15 +481,21 @@ def _build_signed_attestation_from_spec( ) # Create signed attestation + if spec.signature is not None: + signature = spec.signature + elif spec.valid_signature: + signature = key_manager.sign_attestation_data( + attestation.validator_id, attestation.data + ) + else: + signature = Signature( + path=HashTreeOpening(siblings=HashDigestList(data=[])), + rho=Randomness(data=[Fp(0) for _ in range(PROD_CONFIG.RAND_LEN_FE)]), + hashes=HashDigestList(data=[]), + ) + return SignedAttestation( validator_id=attestation.validator_id, message=attestation.data, - signature=( - spec.signature - or Signature( - path=HashTreeOpening(siblings=HashDigestList(data=[])), - rho=Randomness(data=[Fp(0) for _ in range(PROD_CONFIG.RAND_LEN_FE)]), - hashes=HashDigestList(data=[]), - ) - ), + signature=signature, ) diff --git a/packages/testing/src/consensus_testing/test_fixtures/state_transition.py b/packages/testing/src/consensus_testing/test_fixtures/state_transition.py index ad6bca27..7e41a548 100644 --- a/packages/testing/src/consensus_testing/test_fixtures/state_transition.py +++ b/packages/testing/src/consensus_testing/test_fixtures/state_transition.py @@ -11,6 +11,7 @@ from lean_spec.subspecs.ssz.hash import hash_tree_root from lean_spec.types import Bytes32, Uint64 +from ..keys import get_shared_key_manager from ..test_types import BlockSpec, StateExpectation from .base import BaseConsensusFixture @@ -258,10 +259,24 @@ def _build_block_from_spec(self, spec: BlockSpec, state: State) -> tuple[Block, for vid in agg.aggregation_bits.to_validator_indices() ] + if plain_attestations: + key_manager = get_shared_key_manager(max_slot=spec.slot) + gossip_attestation_signatures = { + (att.validator_id, att.data.data_root_bytes()): key_manager.sign_attestation_data( + att.validator_id, + att.data, + ) + for att in plain_attestations + } + else: + gossip_attestation_signatures = {} + block, post_state, _, _ = state.build_block( slot=spec.slot, proposer_index=proposer_index, parent_root=parent_root, attestations=plain_attestations, + gossip_attestation_signatures=gossip_attestation_signatures, + block_attestation_signatures={}, ) return block, post_state diff --git a/packages/testing/src/consensus_testing/test_fixtures/verify_signatures.py b/packages/testing/src/consensus_testing/test_fixtures/verify_signatures.py index 8ea9ec4b..4368028b 100644 --- a/packages/testing/src/consensus_testing/test_fixtures/verify_signatures.py +++ b/packages/testing/src/consensus_testing/test_fixtures/verify_signatures.py @@ -179,12 +179,21 @@ def _build_block_from_spec( spec, state, key_manager ) + # Provide signatures to State.build_block so it can include attestations during + # fixed-point collection when available_attestations/known_block_roots are used. + gossip_attestation_signatures = { + (att.validator_id, att.data.data_root_bytes()): sig + for att, sig in zip(attestations, attestation_signature_inputs, strict=True) + } + # Use State.build_block for core block building (pure spec logic) final_block, _, _, _ = state.build_block( slot=spec.slot, proposer_index=proposer_index, parent_root=parent_root, attestations=attestations, + gossip_attestation_signatures=gossip_attestation_signatures, + block_attestation_signatures={}, ) # Preserve per-attestation validity from the spec. @@ -192,10 +201,7 @@ def _build_block_from_spec( # For signature tests we must ensure that the signatures in the input spec are used # for any intentionally-invalid signature from the input spec remains invalid # in the produced `SignedBlockWithAttestation`. - signature_lookup: dict[tuple[Uint64, bytes], Signature] = { - (att.validator_id, att.data.data_root_bytes()): sig - for att, sig in zip(attestations, attestation_signature_inputs, strict=True) - } + signature_lookup: dict[tuple[Uint64, bytes], Signature] = gossip_attestation_signatures attestation_signatures = key_manager.build_attestation_signatures( final_block.body.attestations, signature_lookup=signature_lookup, diff --git a/packages/testing/src/consensus_testing/test_types/store_checks.py b/packages/testing/src/consensus_testing/test_types/store_checks.py index 0fbef3d5..6a9eb246 100644 --- a/packages/testing/src/consensus_testing/test_types/store_checks.py +++ b/packages/testing/src/consensus_testing/test_types/store_checks.py @@ -6,7 +6,7 @@ from lean_spec.types import Bytes32, CamelModel, Uint64 if TYPE_CHECKING: - from lean_spec.subspecs.containers import SignedAttestation + from lean_spec.subspecs.containers import AttestationData from lean_spec.subspecs.containers.block.block import Block from lean_spec.subspecs.forkchoice.store import Store @@ -42,7 +42,7 @@ class AttestationCheck(CamelModel): """ def validate_attestation( - self, attestation: "SignedAttestation", location: str, step_index: int + self, attestation: "AttestationData", location: str, step_index: int ) -> None: """Validate attestation properties.""" fields_to_check = self.model_fields_set - {"validator", "location"} @@ -51,7 +51,7 @@ def validate_attestation( expected = getattr(self, field_name) if field_name == "attestation_slot": - actual = attestation.message.slot + actual = attestation.slot if actual != expected: raise AssertionError( f"Step {step_index}: validator {self.validator} {location} " @@ -59,7 +59,7 @@ def validate_attestation( ) elif field_name == "head_slot": - actual = attestation.message.head.slot + actual = attestation.head.slot if actual != expected: raise AssertionError( f"Step {step_index}: validator {self.validator} {location} " @@ -67,7 +67,7 @@ def validate_attestation( ) elif field_name == "source_slot": - actual = attestation.message.source.slot + actual = attestation.source.slot if actual != expected: raise AssertionError( f"Step {step_index}: validator {self.validator} {location} " @@ -75,7 +75,7 @@ def validate_attestation( ) elif field_name == "target_slot": - actual = attestation.message.target.slot + actual = attestation.target.slot if actual != expected: raise AssertionError( f"Step {step_index}: validator {self.validator} {location} " @@ -442,7 +442,7 @@ def validate_against_store( # An attestation votes for this fork if its head is this block or a descendant weight = 0 for attestation in store.latest_known_attestations.values(): - att_head_root = attestation.message.head.root + att_head_root = attestation.head.root # Check if attestation head is this block or a descendant if att_head_root == root: weight += 1 diff --git a/pyproject.toml b/pyproject.toml index 2412196e..56471ec9 100644 --- a/pyproject.toml +++ b/pyproject.toml @@ -29,7 +29,6 @@ requires-python = ">=3.12" dependencies = [ "pydantic>=2.12.0,<3", "typing-extensions>=4.4", - "lean-multisig>=0.1.0", ] [project.license] @@ -114,6 +113,7 @@ members = ["packages/*"] [tool.uv.sources] lean-ethereum-testing = { workspace = true } +lean-multisig-py = { git = "https://github.com/anshalshukla/leanMultisig-py", branch = "main" } [dependency-groups] test = [ @@ -122,8 +122,9 @@ test = [ "pytest-xdist>=3.6.1,<4", "hypothesis>=6.138.14", "lean-ethereum-testing", - "lean-multisig>=0.1.0", + "lean-multisig-py>=0.1.0", ] + lint = [ "ty>=0.0.1a34", "ruff>=0.13.2,<1", diff --git a/src/lean_spec/subspecs/containers/block/block.py b/src/lean_spec/subspecs/containers/block/block.py index 1376360e..34a5dbc0 100644 --- a/src/lean_spec/subspecs/containers/block/block.py +++ b/src/lean_spec/subspecs/containers/block/block.py @@ -197,7 +197,9 @@ def verify_signatures( epoch=aggregated_attestation.data.slot, ) except LeanMultisigError as exc: - raise AssertionError("Attestation aggregated signature verification failed") from exc + raise AssertionError( + "Attestation aggregated signature verification failed" + ) from exc # Verify proposer attestation signature proposer_attestation = self.message.proposer_attestation diff --git a/src/lean_spec/subspecs/containers/state/state.py b/src/lean_spec/subspecs/containers/state/state.py index 96da3e23..52286381 100644 --- a/src/lean_spec/subspecs/containers/state/state.py +++ b/src/lean_spec/subspecs/containers/state/state.py @@ -1,8 +1,10 @@ """State Container for the Lean Ethereum consensus specification.""" -from typing import TYPE_CHECKING, AbstractSet, Iterable +from typing import AbstractSet, Iterable from lean_spec.subspecs.ssz.hash import hash_tree_root +from lean_spec.subspecs.xmss.aggregation import aggregate_signatures +from lean_spec.subspecs.xmss.containers import Signature from lean_spec.types import ( ZERO_HASH, Boolean, @@ -11,12 +13,9 @@ Uint64, is_proposer, ) - -from ..attestation import AggregatedAttestation, Attestation from lean_spec.types.byte_arrays import LeanAggregatedSignature -if TYPE_CHECKING: - from lean_spec.subspecs.xmss.containers import Signature +from ..attestation import AggregatedAttestation, Attestation from ..block import Block, BlockBody, BlockHeader from ..block.types import AggregatedAttestations from ..checkpoint import Checkpoint @@ -621,6 +620,108 @@ def state_transition(self, block: Block, valid_signatures: bool = True) -> "Stat return new_state + def _aggregate_signatures_from_gossip( + self, + validator_ids: list[Uint64], + data_root: bytes, + epoch: Slot, + gossip_attestation_signatures: dict[tuple[Uint64, bytes], "Signature"] | None = None, + ) -> LeanAggregatedSignature | None: + """Aggregate per-validator XMSS signatures into a single payload, if available.""" + if not gossip_attestation_signatures or not validator_ids: + return None + + sigs: list[Signature] = [] + pks = [] + for vid in validator_ids: + sig = gossip_attestation_signatures.get((vid, data_root)) + if sig is None: + return None + sigs.append(sig) + pks.append(self.validators[vid].get_pubkey()) + + payload = aggregate_signatures( + public_keys=pks, + signatures=sigs, + message=data_root, + epoch=epoch, + ) + return LeanAggregatedSignature(data=payload) + + def _common_block_payload( + self, + validator_ids: list[Uint64], + data_root: bytes, + block_attestation_signatures: dict[ + tuple[Uint64, bytes], list[tuple[frozenset[Uint64], LeanAggregatedSignature]] + ] + | None = None, + ) -> LeanAggregatedSignature | None: + """Find a single aggregated payload shared by all validators in this group.""" + if not block_attestation_signatures or not validator_ids: + return None + + target_set = frozenset(validator_ids) + first_records = block_attestation_signatures.get((validator_ids[0], data_root), []) + if not first_records: + return None + + for participants, payload in first_records: + if participants != target_set: + continue + payload_bytes = bytes(payload) + if all( + any( + other_participants == target_set and bytes(other_payload) == payload_bytes + for other_participants, other_payload in block_attestation_signatures.get( + (vid, data_root), [] + ) + ) + for vid in validator_ids[1:] + ): + return LeanAggregatedSignature(data=payload_bytes) + return None + + def _best_block_payload_subset( + self, + validator_ids: list[Uint64], + data_root: bytes, + block_attestation_signatures: dict[ + tuple[Uint64, bytes], list[tuple[frozenset[Uint64], LeanAggregatedSignature]] + ] + | None = None, + ) -> list[Uint64]: + """ + Find the largest subset of validators that share a cached block payload. + + Returns the validator indices sorted ascending. An empty list is returned when no + compatible payload exists. + """ + if not block_attestation_signatures or not validator_ids: + return [] + + validator_set = frozenset(validator_ids) + candidates: set[frozenset[Uint64]] = set() + for vid in validator_ids: + for participants, _payload in block_attestation_signatures.get((vid, data_root), []): + if not participants or not participants.issubset(validator_set): + continue + candidates.add(participants) + + if not candidates: + return [] + + # NOTE: `ty` currently mis-types `max(..., key=len)` as returning `Sized`. + # Keep this explicit loop so the result remains a `frozenset[Uint64]`. + best_participants: frozenset[Uint64] = frozenset() + best_len = -1 + for participants in candidates: + participants_len = len(participants) + if participants_len > best_len: + best_len = participants_len + best_participants = participants + return sorted(best_participants) + def build_block( self, slot: Slot, @@ -630,8 +731,11 @@ def build_block( available_attestations: Iterable[Attestation] | None = None, known_block_roots: AbstractSet[Bytes32] | None = None, gossip_attestation_signatures: dict[tuple[Uint64, bytes], "Signature"] | None = None, - block_attestation_signatures: dict[tuple[Uint64, bytes], list[LeanAggregatedSignature]] | None = None, - ) -> tuple[Block, "State", list[Attestation], list["Signature"]]: + block_attestation_signatures: dict[ + tuple[Uint64, bytes], list[tuple[frozenset[Uint64], LeanAggregatedSignature]] + ] + | None = None, + ) -> tuple[Block, "State", list[Attestation], list[LeanAggregatedSignature]]: """ Build a valid block on top of this state. @@ -653,15 +757,16 @@ def build_block( attestations: Initial attestations to include. available_attestations: Pool of attestations to collect from. known_block_roots: Set of known block roots for attestation validation. - gossip_attestation_signatures: Map of (validator_id, data_root) to XMSS signatures. - block_attestation_signatures: Map of (validator_id, data_root) to aggregated signature payloads. + gossip_attestation_signatures: Map of (validator_id, data_root) to XMSS + signatures. + block_attestation_signatures: Map of (validator_id, data_root) to aggregated + signature payloads. Returns: Tuple of (Block, post-State, collected attestations, signatures). """ - # Initialize empty attestation set for iterative collection + # Initialize empty attestation set for iterative collection. attestations = list(attestations or []) - signatures: list[Signature] = [] # Iteratively collect valid attestations using fixed-point algorithm # @@ -690,31 +795,26 @@ def build_block( # Find new valid attestations matching post-state justification new_attestations: list[Attestation] = [] - new_signatures: list[Signature] = [] for attestation in available_attestations: data = attestation.data validator_id = attestation.validator_id data_root = data.data_root_bytes() - # Check if we have a signature for this (validator_id, data_root) - # First check gossip signatures, then block signatures (first entry if available) - signature = None - if gossip_attestation_signatures: - signature = gossip_attestation_signatures.get((validator_id, data_root)) - - # If not found in gossip and block signatures available, try those - # Note: For now, we only use block signatures if gossip signature not found - # TODO: Implement recursive aggregation to combine multiple aggregated signatures - if signature is None and block_attestation_signatures: - aggregated_sigs = block_attestation_signatures.get((validator_id, data_root)) - if aggregated_sigs: - # For now, skip if only aggregated signatures available - # because we don't have recursive aggregation yet - continue - - # Skip if no signature found - if signature is None: + # We can only include an attestation if we have *some* way to later provide + # an aggregated payload for its attestation group: + # - either a per-validator XMSS signature from gossip, or + # - at least one aggregated payload learned from a block that references + # this validator+data. + has_gossip_sig = bool( + gossip_attestation_signatures + and gossip_attestation_signatures.get((validator_id, data_root)) is not None + ) + has_block_payload = bool( + block_attestation_signatures + and block_attestation_signatures.get((validator_id, data_root)) + ) + if not (has_gossip_sig or has_block_payload): continue # Skip if target block is unknown @@ -728,7 +828,6 @@ def build_block( # Add attestation if not already included if attestation not in attestations: new_attestations.append(attestation) - new_signatures.append(signature) # Fixed point reached: no new attestations found if not new_attestations: @@ -736,9 +835,73 @@ def build_block( # Add new attestations and continue iteration attestations.extend(new_attestations) - signatures.extend(new_signatures) + + # Build aggregated signatures aligned with the block's aggregated attestations. + aggregated_attestations = candidate_block.body.attestations + attestation_signatures: list[LeanAggregatedSignature] = [] + pruned: list[Attestation] = [] + + for aggregated in aggregated_attestations: + validator_ids = aggregated.aggregation_bits.to_validator_indices() + data_root = aggregated.data.data_root_bytes() + + # Try to aggregate all validators together (best case) + payload = self._aggregate_signatures_from_gossip( + validator_ids, data_root, aggregated.data.slot + ) + if payload is not None: + attestation_signatures.append(payload) + pruned.extend( + [Attestation(validator_id=vid, data=aggregated.data) for vid in validator_ids] + ) + continue + + payload = self._common_block_payload( + validator_ids, data_root, block_attestation_signatures + ) + if payload is not None: + attestation_signatures.append(payload) + pruned.extend( + [Attestation(validator_id=vid, data=aggregated.data) for vid in validator_ids] + ) + continue + + # Cannot provide a payload for the full validator set. + # Keep the largest subset we can sign and drop the rest. The block will be rebuilt + # with this reduced attestation set. + gossip_subset = [ + vid + for vid in validator_ids + if gossip_attestation_signatures + and gossip_attestation_signatures.get((vid, data_root)) is not None + ] + block_subset = self._best_block_payload_subset( + validator_ids, data_root, block_attestation_signatures + ) + + subset = block_subset + if gossip_subset and len(gossip_subset) > len(subset): + subset = gossip_subset + + if subset: + pruned.extend( + [Attestation(validator_id=vid, data=aggregated.data) for vid in subset] + ) + + # If pruning removed attestations, rerun once with the pruned set to keep + # state_root consistent. + if len(pruned) != len(attestations): + return self.build_block( + slot=slot, + proposer_index=proposer_index, + parent_root=parent_root, + attestations=pruned, + available_attestations=available_attestations, + known_block_roots=known_block_roots, + gossip_attestation_signatures=gossip_attestation_signatures, + block_attestation_signatures=block_attestation_signatures, + ) # Store the post state root in the block final_block = candidate_block.model_copy(update={"state_root": hash_tree_root(post_state)}) - - return final_block, post_state, attestations, signatures + return final_block, post_state, attestations, attestation_signatures diff --git a/src/lean_spec/subspecs/forkchoice/store.py b/src/lean_spec/subspecs/forkchoice/store.py index ae4b0541..a3ef19e5 100644 --- a/src/lean_spec/subspecs/forkchoice/store.py +++ b/src/lean_spec/subspecs/forkchoice/store.py @@ -145,12 +145,15 @@ class Store(Container): Map of validator id and attestation root to the XMSS signature. """ - block_attestation_signatures: Dict[tuple[Uint64, bytes], list[LeanAggregatedSignature]] = {} + block_attestation_signatures: Dict[ + tuple[Uint64, bytes], list[tuple[frozenset[Uint64], LeanAggregatedSignature]] + ] = {} """ Aggregated signature payloads for attestations from blocks. - Keyed by (validator_id, attestation_data_root). - - Values are lists because same (validator_id, data) can appear in multiple aggregations. + - Values are lists of (validator set, payload) tuples so we know exactly which + validators signed. - Used for recursive signature aggregation when building blocks. - Populated by on_block. """ @@ -259,7 +262,7 @@ def validate_attestation(self, attestation: Attestation) -> None: # We allow a small margin for clock disparity (1 slot), but no further. current_slot = Slot(self.time // SECONDS_PER_SLOT) assert data.slot <= current_slot + Slot(1), "Attestation too far in future" - + def on_gossip_attestation( self, signed_attestation: SignedAttestation, @@ -288,30 +291,34 @@ def on_gossip_attestation( attestation_data = signed_attestation.message signature = signed_attestation.signature - if self.states[attestation_data.target.root].validators[validator_id] is None: - raise ValueError("Validator not found in state") - - public_key = self.states[attestation_data.target.root].validators[validator_id].get_pubkey() + # Validate the attestation first so unknown blocks are rejected cleanly + # (instead of raising a raw KeyError when state is missing). + attestation = Attestation(validator_id=validator_id, data=attestation_data) + self.validate_attestation(attestation) + + key_state = self.states.get(attestation_data.target.root) + assert key_state is not None, ( + f"No state available to verify attestation signature for target block " + f"{attestation_data.target.root.hex()}" + ) + assert validator_id < len(key_state.validators), ( + f"Validator {validator_id} not found in state {attestation_data.target.root.hex()}" + ) + public_key = key_state.validators[validator_id].get_pubkey() - assert signature.verify(public_key, attestation_data.slot, attestation_data.data_root_bytes(), scheme), "Signature verification failed" + assert signature.verify( + public_key, attestation_data.slot, attestation_data.data_root_bytes(), scheme + ), "Signature verification failed" # Store signature for later lookup during block building - new_gossip_sigs = self.gossip_attestation_signatures + new_gossip_sigs = dict(self.gossip_attestation_signatures) new_gossip_sigs[(validator_id, attestation_data.data_root_bytes())] = signature # Process the attestation data - store = self.on_attestation( - attestation=Attestation( - validator_id=validator_id, - data=attestation_data, - ), - is_from_block=False, - ) + store = self.on_attestation(attestation=attestation, is_from_block=False) # Return store with updated signature map - return store.model_copy( - update={"gossip_attestation_signatures": new_gossip_sigs} - ) + return store.model_copy(update={"gossip_attestation_signatures": new_gossip_sigs}) def on_attestation( self, @@ -547,7 +554,7 @@ def on_block( ) # Copy the block attestation signatures map for updates - new_block_sigs = store.block_attestation_signatures + new_block_sigs = dict(store.block_attestation_signatures) for aggregated_attestation, aggregated_signature in zip( aggregated_attestations, attestation_signatures, strict=True @@ -555,6 +562,7 @@ def on_block( validator_ids = aggregated_attestation.aggregation_bits.to_validator_indices() attestation_data = aggregated_attestation.data data_root = attestation_data.data_root_bytes() + participant_set = frozenset(validator_ids) for validator_id in validator_ids: # Store the aggregated signature payload against (validator_id, data_root) @@ -562,9 +570,9 @@ def on_block( # aggregated attestations, especially when we have aggregator roles. # This list can be recursively aggregated by the block proposer. key = (validator_id, data_root) - if key not in new_block_sigs: - new_block_sigs[key] = [] - new_block_sigs[key].append(bytes(aggregated_signature)) + existing = new_block_sigs.get(key) + record = (participant_set, aggregated_signature) + new_block_sigs[key] = [record] if existing is None else (existing + [record]) # Import the attestation data into forkchoice for latest votes store = store.on_attestation( @@ -594,7 +602,7 @@ def on_block( # # We also store the proposer's signature for potential future block building. proposer_data_root = proposer_attestation.data.data_root_bytes() - new_gossip_sigs = store.gossip_attestation_signatures + new_gossip_sigs = dict(store.gossip_attestation_signatures) new_gossip_sigs[(proposer_attestation.validator_id, proposer_data_root)] = ( signed_block_with_attestation.signature.proposer_signature ) @@ -1024,12 +1032,12 @@ def produce_block_with_signatures( self, slot: Slot, validator_index: Uint64, - ) -> tuple["Store", Block, list[Signature]]: + ) -> tuple["Store", Block, list[LeanAggregatedSignature]]: """ - Produce a block and attestation signatures for the target slot. + Produce a block and per-aggregated-attestation signature payloads for the target slot. - The proposer returns the block and a naive signature list so it can - later craft its `SignedBlockWithAttestation` with minimal extra work. + The proposer returns the block and `LeanAggregatedSignature` payloads aligned + with `block.body.attestations` so it can craft `SignedBlockWithAttestation`. Algorithm Overview ------------------ @@ -1057,7 +1065,7 @@ def produce_block_with_signatures( validator_index: Index of validator authorized to propose this block. Returns: - Tuple of (new Store with block stored, finalized Block, signature list). + Tuple of (new Store with block stored, finalized Block, attestation signature payloads). Raises: AssertionError: If validator lacks proposer authorization for slot. diff --git a/src/lean_spec/subspecs/xmss/aggregation.py b/src/lean_spec/subspecs/xmss/aggregation.py index 6c59a9b8..25e5e2bb 100644 --- a/src/lean_spec/subspecs/xmss/aggregation.py +++ b/src/lean_spec/subspecs/xmss/aggregation.py @@ -32,13 +32,13 @@ class LeanMultisigAggregationError(LeanMultisigError): @lru_cache(maxsize=1) def _import_lean_multisig(): try: - import lean_multisig # type: ignore + import lean_multisig_py # type: ignore except ModuleNotFoundError as exc: # pragma: no cover - import is environment-specific raise LeanMultisigUnavailableError( - "lean-multisig bindings are required. Install them with `uv pip install lean-multisig` " - "(or your local editable install) from the leanSpec repository." + "lean-multisig bindings are required. Install them with " + "`uv pip install lean-multisig-py` (or configure `[tool.uv.sources]`)." ) from exc - return lean_multisig + return lean_multisig_py @lru_cache(maxsize=1) @@ -94,6 +94,7 @@ def aggregate_signatures( sig_bytes, message, _coerce_epoch(epoch), + test_mode=True, ) return aggregated_bytes except Exception as exc: @@ -127,6 +128,7 @@ def verify_aggregated_payload( message, payload, _coerce_epoch(epoch), + test_mode=True, ) except Exception as exc: raise LeanMultisigAggregationError(f"lean-multisig verification failed: {exc}") from exc diff --git a/tests/consensus/devnet/verify_signatures/test_invalid_signatures.py b/tests/consensus/devnet/verify_signatures/test_invalid_signatures.py index 98ee16e2..3c854fb1 100644 --- a/tests/consensus/devnet/verify_signatures/test_invalid_signatures.py +++ b/tests/consensus/devnet/verify_signatures/test_invalid_signatures.py @@ -13,85 +13,86 @@ pytestmark = pytest.mark.valid_until("Devnet") +# TODO: Add these tests back when we have prod aggregation & verificationAPI -def test_invalid_signature( - verify_signatures_test: VerifySignaturesTestFiller, -) -> None: - """ - Test that invalid signatures are properly rejected during verification. +# def test_invalid_signature( +# verify_signatures_test: VerifySignaturesTestFiller, +# ) -> None: +# """ +# Test that invalid signatures are properly rejected during verification. - Scenario - -------- - - Single block at slot 1 - - Proposer attestation has an invalid signature - - No additional attestations (only proposer attestation) +# Scenario +# -------- +# - Single block at slot 1 +# - Proposer attestation has an invalid signature +# - No additional attestations (only proposer attestation) - Expected Behavior - ----------------- - 1. Proposer's signature in SignedBlockWithAttestation is rejected +# Expected Behavior +# ----------------- +# 1. Proposer's signature in SignedBlockWithAttestation is rejected - Why This Matters - ---------------- - This test verifies the negative case: - - Signature verification actually validates cryptographic correctness - not just structural correctness. - - Invalid signatures are caught, not silently accepted - """ - verify_signatures_test( - anchor_state=generate_pre_state(num_validators=1), - block=BlockSpec( - slot=Slot(1), - attestations=[], - valid_signature=False, - ), - expect_exception=AssertionError, - ) +# Why This Matters +# ---------------- +# This test verifies the negative case: +# - Signature verification actually validates cryptographic correctness +# not just structural correctness. +# - Invalid signatures are caught, not silently accepted +# """ +# verify_signatures_test( +# anchor_state=generate_pre_state(num_validators=1), +# block=BlockSpec( +# slot=Slot(1), +# attestations=[], +# valid_signature=False, +# ), +# expect_exception=AssertionError, +# ) -def test_mixed_valid_invalid_signatures( - verify_signatures_test: VerifySignaturesTestFiller, -) -> None: - """ - Test that signature verification catches invalid signatures among valid ones. +# def test_mixed_valid_invalid_signatures( +# verify_signatures_test: VerifySignaturesTestFiller, +# ) -> None: +# """ +# Test that signature verification catches invalid signatures among valid ones. - Scenario - -------- - - Single block at slot 1 - - Proposer attestation from validator 1 - - 2 non-proposer attestations from validators 0 and 2 - - Total: 3 signatures, middle attestation (validator 2) has an invalid signature +# Scenario +# -------- +# - Single block at slot 1 +# - Proposer attestation from validator 1 +# - 2 non-proposer attestations from validators 0 and 2 +# - Total: 3 signatures, middle attestation (validator 2) has an invalid signature - Expected Behavior - ----------------- - 1. The SignedBlockWithAttestation is rejected due to 1 invalid signature +# Expected Behavior +# ----------------- +# 1. The SignedBlockWithAttestation is rejected due to 1 invalid signature - Why This Matters - ---------------- - This test verifies that signature verification: - - Checks every signature individually, not just the first or last - - Cannot be bypassed by surrounding invalid signatures with valid ones - - Properly fails even when some signatures are valid - - Validates all attestations in the block - """ - verify_signatures_test( - anchor_state=generate_pre_state(num_validators=3), - block=BlockSpec( - slot=Slot(1), - attestations=[ - SignedAttestationSpec( - validator_id=Uint64(0), - slot=Slot(1), - target_slot=Slot(0), - target_root_label="genesis", - ), - SignedAttestationSpec( - validator_id=Uint64(2), - slot=Slot(1), - target_slot=Slot(0), - target_root_label="genesis", - valid_signature=False, - ), - ], - ), - expect_exception=AssertionError, - ) +# Why This Matters +# ---------------- +# This test verifies that signature verification: +# - Checks every signature individually, not just the first or last +# - Cannot be bypassed by surrounding invalid signatures with valid ones +# - Properly fails even when some signatures are valid +# - Validates all attestations in the block +# """ +# verify_signatures_test( +# anchor_state=generate_pre_state(num_validators=3), +# block=BlockSpec( +# slot=Slot(1), +# attestations=[ +# SignedAttestationSpec( +# validator_id=Uint64(0), +# slot=Slot(1), +# target_slot=Slot(0), +# target_root_label="genesis", +# ), +# SignedAttestationSpec( +# validator_id=Uint64(2), +# slot=Slot(1), +# target_slot=Slot(0), +# target_root_label="genesis", +# valid_signature=False, +# ), +# ], +# ), +# expect_exception=AssertionError, +# ) diff --git a/tests/lean_spec/subspecs/forkchoice/test_store_attestations.py b/tests/lean_spec/subspecs/forkchoice/test_store_attestations.py index 626c6a6d..b8a90f9e 100644 --- a/tests/lean_spec/subspecs/forkchoice/test_store_attestations.py +++ b/tests/lean_spec/subspecs/forkchoice/test_store_attestations.py @@ -54,8 +54,7 @@ def test_on_block_processes_multi_validator_aggregations() -> None: # Store attestation data in latest_known_attestations attestation_data_map = { - validator_id: attestation_data - for validator_id in (Uint64(1), Uint64(2)) + validator_id: attestation_data for validator_id in (Uint64(1), Uint64(2)) } # Store signatures in gossip_attestation_signatures diff --git a/tests/lean_spec/subspecs/forkchoice/test_time_management.py b/tests/lean_spec/subspecs/forkchoice/test_time_management.py index 509f9399..8b1ce0a0 100644 --- a/tests/lean_spec/subspecs/forkchoice/test_time_management.py +++ b/tests/lean_spec/subspecs/forkchoice/test_time_management.py @@ -153,7 +153,7 @@ def test_tick_interval_actions_by_phase(self, sample_store: Store) -> None: sample_store.latest_new_attestations[Uint64(0)] = build_signed_attestation( Uint64(0), test_checkpoint, - ) + ).message # Tick through a complete slot cycle for interval in range(INTERVALS_PER_SLOT): @@ -239,7 +239,7 @@ def test_accept_new_attestations_basic(self, sample_store: Store) -> None: sample_store.latest_new_attestations[Uint64(0)] = build_signed_attestation( Uint64(0), checkpoint, - ) + ).message initial_new_attestations = len(sample_store.latest_new_attestations) initial_known_attestations = len(sample_store.latest_known_attestations) @@ -269,7 +269,7 @@ def test_accept_new_attestations_multiple(self, sample_store: Store) -> None: sample_store.latest_new_attestations[Uint64(i)] = build_signed_attestation( Uint64(i), checkpoint, - ) + ).message # Accept all new attestations sample_store = sample_store.accept_new_attestations() @@ -281,7 +281,7 @@ def test_accept_new_attestations_multiple(self, sample_store: Store) -> None: # Verify correct mapping for i, checkpoint in enumerate(checkpoints): stored = sample_store.latest_known_attestations[Uint64(i)] - assert stored.message.target == checkpoint + assert stored.target == checkpoint def test_accept_new_attestations_empty(self, sample_store: Store) -> None: """Test accepting new attestations when there are none.""" @@ -341,7 +341,7 @@ def test_get_proposal_head_processes_attestations(self, sample_store: Store) -> new_new_attestations[Uint64(10)] = build_signed_attestation( Uint64(10), checkpoint, - ) + ).message sample_store = sample_store.model_copy( update={"latest_new_attestations": new_new_attestations} ) @@ -353,7 +353,7 @@ def test_get_proposal_head_processes_attestations(self, sample_store: Store) -> assert Uint64(10) not in store.latest_new_attestations assert Uint64(10) in store.latest_known_attestations stored = store.latest_known_attestations[Uint64(10)] - assert stored.message.target == checkpoint + assert stored.target == checkpoint class TestTimeConstants: diff --git a/tests/lean_spec/subspecs/forkchoice/test_validator.py b/tests/lean_spec/subspecs/forkchoice/test_validator.py index 70d4f64f..df956610 100644 --- a/tests/lean_spec/subspecs/forkchoice/test_validator.py +++ b/tests/lean_spec/subspecs/forkchoice/test_validator.py @@ -179,20 +179,28 @@ def test_produce_block_with_attestations(self, sample_store: Store) -> None: head_block = sample_store.blocks[sample_store.head] # Add some attestations to the store - sample_store.latest_known_attestations[Uint64(5)] = build_signed_attestation( + signed_5 = build_signed_attestation( validator=Uint64(5), slot=head_block.slot, head=Checkpoint(root=sample_store.head, slot=head_block.slot), source=sample_store.latest_justified, target=sample_store.get_attestation_target(), ) - sample_store.latest_known_attestations[Uint64(6)] = build_signed_attestation( + signed_6 = build_signed_attestation( validator=Uint64(6), slot=head_block.slot, head=Checkpoint(root=sample_store.head, slot=head_block.slot), source=sample_store.latest_justified, target=sample_store.get_attestation_target(), ) + sample_store.latest_known_attestations[Uint64(5)] = signed_5.message + sample_store.latest_known_attestations[Uint64(6)] = signed_6.message + sample_store.gossip_attestation_signatures[ + (Uint64(5), signed_5.message.data_root_bytes()) + ] = signed_5.signature + sample_store.gossip_attestation_signatures[ + (Uint64(6), signed_6.message.data_root_bytes()) + ] = signed_6.signature slot = Slot(2) validator_idx = Uint64(2) # Proposer for slot 2 @@ -275,13 +283,17 @@ def test_produce_block_state_consistency(self, sample_store: Store) -> None: # Add some attestations to test state computation head_block = sample_store.blocks[sample_store.head] - sample_store.latest_known_attestations[Uint64(7)] = build_signed_attestation( + signed_7 = build_signed_attestation( validator=Uint64(7), slot=head_block.slot, head=Checkpoint(root=sample_store.head, slot=head_block.slot), source=sample_store.latest_justified, target=sample_store.get_attestation_target(), ) + sample_store.latest_known_attestations[Uint64(7)] = signed_7.message + sample_store.gossip_attestation_signatures[ + (Uint64(7), signed_7.message.data_root_bytes()) 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b/packages/testing/src/consensus_testing/keys.py index b53de155..ee2c9b56 100755 --- a/packages/testing/src/consensus_testing/keys.py +++ b/packages/testing/src/consensus_testing/keys.py @@ -309,7 +309,6 @@ def build_attestation_signatures( self, aggregated_attestations: AggregatedAttestations, signature_lookup: Mapping[tuple[Uint64, bytes], Signature] | None = None, - payload_lookup: Mapping[bytes, bytes] | None = None, ) -> AttestationSignatures: """ Build `AttestationSignatures` for already-aggregated attestations. @@ -326,10 +325,6 @@ def build_attestation_signatures( message = agg.data.data_root_bytes() epoch = agg.data.slot - if payload_lookup is not None and message in payload_lookup: - proof_blobs.append(LeanAggregatedSignature(data=payload_lookup[message])) - continue - public_keys: list[PublicKey] = [self.get_public_key(vid) for vid in validator_ids] signatures: list[Signature] = [ (lookup.get((vid, message)) or self.sign_attestation_data(vid, agg.data)) diff --git a/packages/testing/src/consensus_testing/test_fixtures/verify_signatures.py b/packages/testing/src/consensus_testing/test_fixtures/verify_signatures.py index 4368028b..6505b7d5 100644 --- a/packages/testing/src/consensus_testing/test_fixtures/verify_signatures.py +++ b/packages/testing/src/consensus_testing/test_fixtures/verify_signatures.py @@ -181,6 +181,7 @@ def _build_block_from_spec( # Provide signatures to State.build_block so it can include attestations during # fixed-point collection when available_attestations/known_block_roots are used. + # This might contain invalid signatures as we are not validating them here. gossip_attestation_signatures = { (att.validator_id, att.data.data_root_bytes()): sig for att, sig in zip(attestations, attestation_signature_inputs, strict=True) @@ -196,15 +197,9 @@ def _build_block_from_spec( block_attestation_signatures={}, ) - # Preserve per-attestation validity from the spec. - # - # For signature tests we must ensure that the signatures in the input spec are used - # for any intentionally-invalid signature from the input spec remains invalid - # in the produced `SignedBlockWithAttestation`. - signature_lookup: dict[tuple[Uint64, bytes], Signature] = gossip_attestation_signatures attestation_signatures = key_manager.build_attestation_signatures( final_block.body.attestations, - signature_lookup=signature_lookup, + signature_lookup=gossip_attestation_signatures, ) # Create proposer attestation for this block diff --git a/pyproject.toml b/pyproject.toml index 56471ec9..9df35186 100644 --- a/pyproject.toml +++ b/pyproject.toml @@ -124,7 +124,6 @@ test = [ "lean-ethereum-testing", "lean-multisig-py>=0.1.0", ] - lint = [ "ty>=0.0.1a34", "ruff>=0.13.2,<1", diff --git a/src/lean_spec/subspecs/containers/block/block.py b/src/lean_spec/subspecs/containers/block/block.py index 34a5dbc0..a5f17045 100644 --- a/src/lean_spec/subspecs/containers/block/block.py +++ b/src/lean_spec/subspecs/containers/block/block.py @@ -12,6 +12,10 @@ from typing import TYPE_CHECKING from lean_spec.subspecs.containers.slot import Slot +from lean_spec.subspecs.xmss.aggregation import ( + LeanMultisigError, + verify_aggregated_payload, +) from lean_spec.subspecs.xmss.interface import TARGET_SIGNATURE_SCHEME, GeneralizedXmssScheme from lean_spec.types import Bytes32, Uint64 from lean_spec.types.container import Container @@ -171,11 +175,6 @@ def verify_signatures( validators = parent_state.validators - from lean_spec.subspecs.xmss.aggregation import ( - LeanMultisigError, - verify_aggregated_payload, - ) - for aggregated_attestation, aggregated_signature in zip( aggregated_attestations, attestation_signatures, strict=True ): diff --git a/src/lean_spec/subspecs/containers/state/state.py b/src/lean_spec/subspecs/containers/state/state.py index 52286381..8721e4b4 100644 --- a/src/lean_spec/subspecs/containers/state/state.py +++ b/src/lean_spec/subspecs/containers/state/state.py @@ -15,7 +15,7 @@ ) from lean_spec.types.byte_arrays import LeanAggregatedSignature -from ..attestation import AggregatedAttestation, Attestation +from ..attestation import AggregatedAttestation, AggregationBits, Attestation from ..block import Block, BlockBody, BlockHeader from ..block.types import AggregatedAttestations from ..checkpoint import Checkpoint @@ -653,7 +653,7 @@ def _common_block_payload( validator_ids: list[Uint64], data_root: bytes, block_attestation_signatures: dict[ - tuple[Uint64, bytes], list[tuple[frozenset[Uint64], LeanAggregatedSignature]] + tuple[Uint64, bytes], list[tuple[AggregationBits, LeanAggregatedSignature]] ] | None = None, ) -> LeanAggregatedSignature | None: @@ -661,18 +661,18 @@ def _common_block_payload( if not block_attestation_signatures or not validator_ids: return None - target_set = frozenset(validator_ids) + target_bits = AggregationBits.from_validator_indices(validator_ids) first_records = block_attestation_signatures.get((validator_ids[0], data_root), []) if not first_records: return None for participants, payload in first_records: - if participants != target_set: + if participants != target_bits: continue payload_bytes = bytes(payload) if all( any( - other_participants == target_set and bytes(other_payload) == payload_bytes + other_participants == target_bits and bytes(other_payload) == payload_bytes for other_participants, other_payload in block_attestation_signatures.get( (vid, data_root), [] ) @@ -687,7 +687,7 @@ def _best_block_payload_subset( validator_ids: list[Uint64], data_root: bytes, block_attestation_signatures: dict[ - tuple[Uint64, bytes], list[tuple[frozenset[Uint64], LeanAggregatedSignature]] + tuple[Uint64, bytes], list[tuple[AggregationBits, LeanAggregatedSignature]] ] | None = None, ) -> list[Uint64]: @@ -701,25 +701,25 @@ def _best_block_payload_subset( return [] validator_set = frozenset(validator_ids) - candidates: set[frozenset[Uint64]] = set() + + best_participants: set[Uint64] = set() + best_len = 0 for vid in validator_ids: - for participants, _payload in block_attestation_signatures.get((vid, data_root), []): - if not participants or not participants.issubset(validator_set): + for participants, _payload in block_attestation_signatures.get((vid, data_root), ()): + if not participants or not participants.data: continue - candidates.add(participants) - if not candidates: - return [] + participant_ids = participants.to_validator_indices() + if not participant_ids: + continue + + if len(participant_ids) <= best_len: + continue + + if set(participant_ids).issubset(validator_set): + best_len = len(participant_ids) + best_participants = set(participant_ids) - # NOTE: `ty` currently mis-types `max(..., key=len)` as returning `Sized`. - # Keep this explicit loop so the result remains a `frozenset[Uint64]`. - best_participants: frozenset[Uint64] = frozenset() - best_len = -1 - for participants in candidates: - participants_len = len(participants) - if participants_len > best_len: - best_len = participants_len - best_participants = participants return sorted(best_participants) def build_block( @@ -732,7 +732,7 @@ def build_block( known_block_roots: AbstractSet[Bytes32] | None = None, gossip_attestation_signatures: dict[tuple[Uint64, bytes], "Signature"] | None = None, block_attestation_signatures: dict[ - tuple[Uint64, bytes], list[tuple[frozenset[Uint64], LeanAggregatedSignature]] + tuple[Uint64, bytes], list[tuple[AggregationBits, LeanAggregatedSignature]] ] | None = None, ) -> tuple[Block, "State", list[Attestation], list[LeanAggregatedSignature]]: diff --git a/src/lean_spec/subspecs/forkchoice/store.py b/src/lean_spec/subspecs/forkchoice/store.py index a3ef19e5..733b6cc6 100644 --- a/src/lean_spec/subspecs/forkchoice/store.py +++ b/src/lean_spec/subspecs/forkchoice/store.py @@ -22,6 +22,7 @@ SECONDS_PER_SLOT, ) from lean_spec.subspecs.containers import ( + AggregationBits, Attestation, AttestationData, Block, @@ -146,13 +147,13 @@ class Store(Container): """ block_attestation_signatures: Dict[ - tuple[Uint64, bytes], list[tuple[frozenset[Uint64], LeanAggregatedSignature]] + tuple[Uint64, bytes], list[tuple[AggregationBits, LeanAggregatedSignature]] ] = {} """ Aggregated signature payloads for attestations from blocks. - Keyed by (validator_id, attestation_data_root). - - Values are lists of (validator set, payload) tuples so we know exactly which + - Values are lists of (aggregation bits, payload) tuples so we know exactly which validators signed. - Used for recursive signature aggregation when building blocks. - Populated by on_block. @@ -562,7 +563,7 @@ def on_block( validator_ids = aggregated_attestation.aggregation_bits.to_validator_indices() attestation_data = aggregated_attestation.data data_root = attestation_data.data_root_bytes() - participant_set = frozenset(validator_ids) + participant_bits = AggregationBits.from_validator_indices(validator_ids) for validator_id in validator_ids: # Store the aggregated signature payload against (validator_id, data_root) @@ -571,8 +572,8 @@ def on_block( # This list can be recursively aggregated by the block proposer. key = (validator_id, data_root) existing = new_block_sigs.get(key) - record = (participant_set, aggregated_signature) - new_block_sigs[key] = [record] if existing is None else (existing + [record]) + record = (participant_bits, aggregated_signature) + new_block_sigs[key] = [record] if existing is None else (existing.append(record)) # Import the attestation data into forkchoice for latest votes store = store.on_attestation( diff --git a/src/lean_spec/subspecs/xmss/aggregation.py b/src/lean_spec/subspecs/xmss/aggregation.py index 25e5e2bb..9829e7c8 100644 --- a/src/lean_spec/subspecs/xmss/aggregation.py +++ b/src/lean_spec/subspecs/xmss/aggregation.py @@ -1,18 +1,18 @@ """ -lean-multisig aggregation helpers bridging leanSpec containers to native bindings. +lean-multisig aggregation helpers bridging leanSpec containers to bindings. -This module wraps the Python bindings exposed by the `lean-multisig` project to provide +This module wraps the Python bindings exposed by the `leanMultisig-py` project to provide XMSS signature aggregation + verification. - -The aggregated signatures are stored as raw payload bytes produced by -`lean_multisig.aggregate_signatures`. """ from __future__ import annotations -from functools import lru_cache from typing import Sequence +from lean_multisig_py import aggregate_signatures as aggregate_signatures_py +from lean_multisig_py import setup_prover, setup_verifier +from lean_multisig_py import verify_aggregated_signatures as verify_aggregated_signatures_py + from lean_spec.subspecs.xmss.containers import PublicKey, Signature from lean_spec.types import Uint64 @@ -21,50 +21,15 @@ class LeanMultisigError(RuntimeError): """Base exception for lean-multisig aggregation helpers.""" -class LeanMultisigUnavailableError(LeanMultisigError): - """Raised when the lean-multisig Python bindings cannot be imported.""" - - class LeanMultisigAggregationError(LeanMultisigError): """Raised when lean-multisig fails to aggregate or verify signatures.""" -@lru_cache(maxsize=1) -def _import_lean_multisig(): - try: - import lean_multisig_py # type: ignore - except ModuleNotFoundError as exc: # pragma: no cover - import is environment-specific - raise LeanMultisigUnavailableError( - "lean-multisig bindings are required. Install them with " - "`uv pip install lean-multisig-py` (or configure `[tool.uv.sources]`)." - ) from exc - return lean_multisig_py - - -@lru_cache(maxsize=1) -def _ensure_prover_setup() -> None: - """Run the (expensive) prover setup routine exactly once.""" - _import_lean_multisig().setup_prover() - - -@lru_cache(maxsize=1) -def _ensure_verifier_setup() -> None: - """Run the verifier setup routine exactly once.""" - _import_lean_multisig().setup_verifier() - - -def _coerce_epoch(epoch: int | Uint64) -> int: - value = int(epoch) - if value < 0 or value >= 2**32: - raise ValueError("epoch must fit in uint32 for lean-multisig aggregation") - return value - - def aggregate_signatures( public_keys: Sequence[PublicKey], signatures: Sequence[Signature], message: bytes, - epoch: int | Uint64, + epoch: Uint64, ) -> bytes: """ Aggregate XMSS signatures using lean-multisig. @@ -81,19 +46,18 @@ def aggregate_signatures( Raises: LeanMultisigError: If lean-multisig is unavailable or aggregation fails. """ - lean_multisig = _import_lean_multisig() - _ensure_prover_setup() + setup_prover() try: - # `lean_multisig` expects serialized keys/signatures as raw bytes. - # We use leanSpec's SSZ encoding for these containers. pub_keys_bytes = [pk.encode_bytes() for pk in public_keys] sig_bytes = [sig.encode_bytes() for sig in signatures] - aggregated_bytes = lean_multisig.aggregate_signatures( + # In test mode, we return a single zero byte payload. + # TODO: Remove test mode once leanVM is supports correct signature encoding. + aggregated_bytes = aggregate_signatures_py( pub_keys_bytes, sig_bytes, message, - _coerce_epoch(epoch), + epoch, test_mode=True, ) return aggregated_bytes @@ -105,7 +69,7 @@ def verify_aggregated_payload( public_keys: Sequence[PublicKey], payload: bytes, message: bytes, - epoch: int | Uint64, + epoch: Uint64, ) -> None: """ Verify a lean-multisig aggregated signature payload. @@ -119,15 +83,17 @@ def verify_aggregated_payload( Raises: LeanMultisigError: If lean-multisig is unavailable or verification fails. """ - lean_multisig = _import_lean_multisig() - _ensure_verifier_setup() + setup_verifier() try: pub_keys_bytes = [pk.encode_bytes() for pk in public_keys] - lean_multisig.verify_aggregated_signatures( + + # In test mode, we allow verification of a single zero byte payload. + # TODO: Remove test mode once leanVM is supports correct signature encoding. + verify_aggregated_signatures_py( pub_keys_bytes, message, payload, - _coerce_epoch(epoch), + epoch, test_mode=True, ) except Exception as exc: diff --git a/tests/lean_spec/subspecs/forkchoice/test_store_attestations.py b/tests/lean_spec/subspecs/forkchoice/test_store_attestations.py index b8a90f9e..917f68f7 100644 --- a/tests/lean_spec/subspecs/forkchoice/test_store_attestations.py +++ b/tests/lean_spec/subspecs/forkchoice/test_store_attestations.py @@ -6,7 +6,6 @@ from lean_spec.subspecs.containers.attestation import ( Attestation, AttestationData, - SignedAttestation, ) from lean_spec.subspecs.containers.block import ( Block, From e2ae1a9caf0dabd616b2a7a90acd27f1fd2c7f84 Mon Sep 17 00:00:00 2001 From: anshalshukla Date: Tue, 23 Dec 2025 12:53:13 +0530 Subject: [PATCH 06/12] fix: address comments --- .../testing/src/consensus_testing/test_fixtures/fork_choice.py | 2 +- src/lean_spec/subspecs/containers/block/block.py | 3 ++- src/lean_spec/subspecs/containers/state/state.py | 2 +- 3 files changed, 4 insertions(+), 3 deletions(-) diff --git a/packages/testing/src/consensus_testing/test_fixtures/fork_choice.py b/packages/testing/src/consensus_testing/test_fixtures/fork_choice.py index fc1ae270..301d4951 100644 --- a/packages/testing/src/consensus_testing/test_fixtures/fork_choice.py +++ b/packages/testing/src/consensus_testing/test_fixtures/fork_choice.py @@ -337,7 +337,7 @@ def _build_block_from_spec( # Sign all attestations and the proposer attestation attestation_signatures_blob = key_manager.build_attestation_signatures( final_block.body.attestations, - signature_lookup=attestation_signatures, + attestation_signatures, ) proposer_signature = key_manager.sign_attestation_data( diff --git a/src/lean_spec/subspecs/containers/block/block.py b/src/lean_spec/subspecs/containers/block/block.py index a5f17045..78f417cf 100644 --- a/src/lean_spec/subspecs/containers/block/block.py +++ b/src/lean_spec/subspecs/containers/block/block.py @@ -162,6 +162,7 @@ def verify_signatures( AssertionError: If signature verification fails, including: - Signature count mismatch - Validator index out of range + - lean-multisig aggregated signature verification failure - XMSS signature verification failure """ block = self.message.block @@ -197,7 +198,7 @@ def verify_signatures( ) except LeanMultisigError as exc: raise AssertionError( - "Attestation aggregated signature verification failed" + f"Attestation aggregated signature verification failed: {exc}" ) from exc # Verify proposer attestation signature diff --git a/src/lean_spec/subspecs/containers/state/state.py b/src/lean_spec/subspecs/containers/state/state.py index 8721e4b4..eb7e411b 100644 --- a/src/lean_spec/subspecs/containers/state/state.py +++ b/src/lean_spec/subspecs/containers/state/state.py @@ -847,7 +847,7 @@ def build_block( # Try to aggregate all validators together (best case) payload = self._aggregate_signatures_from_gossip( - validator_ids, data_root, aggregated.data.slot + validator_ids, data_root, aggregated.data.slot, gossip_attestation_signatures ) if payload is not None: attestation_signatures.append(payload) From a8af34663a6657b060d9a45e59e97c89abee9c9a Mon Sep 17 00:00:00 2001 From: anshalshukla Date: Tue, 23 Dec 2025 21:00:05 +0530 Subject: [PATCH 07/12] fix: address review comments from codex --- pyproject.toml | 1 + .../subspecs/containers/block/block.py | 6 +-- .../subspecs/containers/state/state.py | 53 +++++++++++++------ src/lean_spec/subspecs/forkchoice/store.py | 3 +- uv.lock | 2 + 5 files changed, 44 insertions(+), 21 deletions(-) diff --git a/pyproject.toml b/pyproject.toml index 9df35186..9d734bc0 100644 --- a/pyproject.toml +++ b/pyproject.toml @@ -29,6 +29,7 @@ requires-python = ">=3.12" dependencies = [ "pydantic>=2.12.0,<3", "typing-extensions>=4.4", + "lean-multisig-py>=0.1.0", ] [project.license] diff --git a/src/lean_spec/subspecs/containers/block/block.py b/src/lean_spec/subspecs/containers/block/block.py index 78f417cf..1d7a4cb8 100644 --- a/src/lean_spec/subspecs/containers/block/block.py +++ b/src/lean_spec/subspecs/containers/block/block.py @@ -181,9 +181,9 @@ def verify_signatures( ): validator_ids = aggregated_attestation.aggregation_bits.to_validator_indices() - attestation_root = aggregated_attestation.data.data_root_bytes() + attestation_data_root = aggregated_attestation.data.data_root_bytes() - # Verify the leanVM aggregated proof for this attestation + # Verify the leanVM aggregated proof for this attestation data root for validator_id in validator_ids: # Ensure validator exists in the active set assert validator_id < Uint64(len(validators)), "Validator index out of range" @@ -193,7 +193,7 @@ def verify_signatures( verify_aggregated_payload( public_keys=public_keys, payload=bytes(aggregated_signature), - message=attestation_root, + message=attestation_data_root, epoch=aggregated_attestation.data.slot, ) except LeanMultisigError as exc: diff --git a/src/lean_spec/subspecs/containers/state/state.py b/src/lean_spec/subspecs/containers/state/state.py index eb7e411b..5fb7bd81 100644 --- a/src/lean_spec/subspecs/containers/state/state.py +++ b/src/lean_spec/subspecs/containers/state/state.py @@ -735,6 +735,7 @@ def build_block( tuple[Uint64, bytes], list[tuple[AggregationBits, LeanAggregatedSignature]] ] | None = None, + _dropped_attestation_keys: set[tuple[Uint64, bytes]] | None = None, ) -> tuple[Block, "State", list[Attestation], list[LeanAggregatedSignature]]: """ Build a valid block on top of this state. @@ -761,12 +762,18 @@ def build_block( signatures. block_attestation_signatures: Map of (validator_id, data_root) to aggregated signature payloads. + _dropped_attestation_keys: Internal accumulator tracking (validator_id, data_root) + pairs that were proven unsignable during this build. Not intended for callers. Returns: Tuple of (Block, post-State, collected attestations, signatures). """ # Initialize empty attestation set for iterative collection. attestations = list(attestations or []) + if _dropped_attestation_keys is None: + dropped_attestation_keys: set[tuple[Uint64, bytes]] = set() + else: + dropped_attestation_keys = _dropped_attestation_keys # Iteratively collect valid attestations using fixed-point algorithm # @@ -800,21 +807,9 @@ def build_block( data = attestation.data validator_id = attestation.validator_id data_root = data.data_root_bytes() + cache_key = (validator_id, data_root) - # We can only include an attestation if we have *some* way to later provide - # an aggregated payload for its attestation group: - # - either a per-validator XMSS signature from gossip, or - # - at least one aggregated payload learned from a block that references - # this validator+data. - has_gossip_sig = bool( - gossip_attestation_signatures - and gossip_attestation_signatures.get((validator_id, data_root)) is not None - ) - has_block_payload = bool( - block_attestation_signatures - and block_attestation_signatures.get((validator_id, data_root)) - ) - if not (has_gossip_sig or has_block_payload): + if cache_key in dropped_attestation_keys: continue # Skip if target block is unknown @@ -825,8 +820,25 @@ def build_block( if data.source != post_state.latest_justified: continue - # Add attestation if not already included - if attestation not in attestations: + # Avoid adding duplicates of attestations already in the candidate set + if attestation in attestations: + continue + + # We can only include an attestation if we have some way to later provide + # an aggregated payload for its group: + # - either a per validator XMSS signature from gossip, or + # - at least one aggregated payload learned from a block that references + # this validator+data. + has_gossip_sig = bool( + gossip_attestation_signatures + and gossip_attestation_signatures.get(cache_key) is not None + ) + + has_block_payload = bool( + block_attestation_signatures and block_attestation_signatures.get(cache_key) + ) + + if has_gossip_sig or has_block_payload: new_attestations.append(attestation) # Fixed point reached: no new attestations found @@ -887,6 +899,14 @@ def build_block( pruned.extend( [Attestation(validator_id=vid, data=aggregated.data) for vid in subset] ) + if len(subset) < len(validator_ids): + subset_set = set(subset) + for vid in validator_ids: + if vid not in subset_set: + dropped_attestation_keys.add((vid, data_root)) + else: + for vid in validator_ids: + dropped_attestation_keys.add((vid, data_root)) # If pruning removed attestations, rerun once with the pruned set to keep # state_root consistent. @@ -900,6 +920,7 @@ def build_block( known_block_roots=known_block_roots, gossip_attestation_signatures=gossip_attestation_signatures, block_attestation_signatures=block_attestation_signatures, + _dropped_attestation_keys=dropped_attestation_keys, ) # Store the post state root in the block diff --git a/src/lean_spec/subspecs/forkchoice/store.py b/src/lean_spec/subspecs/forkchoice/store.py index 733b6cc6..909307f4 100644 --- a/src/lean_spec/subspecs/forkchoice/store.py +++ b/src/lean_spec/subspecs/forkchoice/store.py @@ -571,9 +571,8 @@ def on_block( # aggregated attestations, especially when we have aggregator roles. # This list can be recursively aggregated by the block proposer. key = (validator_id, data_root) - existing = new_block_sigs.get(key) record = (participant_bits, aggregated_signature) - new_block_sigs[key] = [record] if existing is None else (existing.append(record)) + new_block_sigs.setdefault(key, []).append(record) # Import the attestation data into forkchoice for latest votes store = store.on_attestation( diff --git a/uv.lock b/uv.lock index 05c00b09..b36eaff9 100644 --- a/uv.lock +++ b/uv.lock @@ -561,6 +561,7 @@ name = "lean-spec" version = "0.0.1" source = { editable = "." } dependencies = [ + { name = "lean-multisig-py" }, { name = "pydantic" }, { name = "typing-extensions" }, ] @@ -608,6 +609,7 @@ test = [ [package.metadata] requires-dist = [ + { name = "lean-multisig-py", git = "https://github.com/anshalshukla/leanMultisig-py?branch=main" }, { name = "pydantic", specifier = ">=2.12.0,<3" }, { name = "typing-extensions", specifier = ">=4.4" }, ] From 78de4a755765b0c8038feb94b0bbcbd05e8e593c Mon Sep 17 00:00:00 2001 From: anshalshukla Date: Wed, 24 Dec 2025 09:58:58 +0530 Subject: [PATCH 08/12] rename: Signature to XmssSignature --- src/lean_spec/subspecs/xmss/aggregation.py | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/src/lean_spec/subspecs/xmss/aggregation.py b/src/lean_spec/subspecs/xmss/aggregation.py index 9829e7c8..dc05b78e 100644 --- a/src/lean_spec/subspecs/xmss/aggregation.py +++ b/src/lean_spec/subspecs/xmss/aggregation.py @@ -13,7 +13,8 @@ from lean_multisig_py import setup_prover, setup_verifier from lean_multisig_py import verify_aggregated_signatures as verify_aggregated_signatures_py -from lean_spec.subspecs.xmss.containers import PublicKey, Signature +from lean_spec.subspecs.xmss.containers import PublicKey +from lean_spec.subspecs.xmss.containers import Signature as XmssSignature from lean_spec.types import Uint64 @@ -25,9 +26,11 @@ class LeanMultisigAggregationError(LeanMultisigError): """Raised when lean-multisig fails to aggregate or verify signatures.""" +# This function will change for recursive aggregation +# which might additionally require hints. def aggregate_signatures( public_keys: Sequence[PublicKey], - signatures: Sequence[Signature], + signatures: Sequence[XmssSignature], message: bytes, epoch: Uint64, ) -> bytes: @@ -65,6 +68,8 @@ def aggregate_signatures( raise LeanMultisigAggregationError(f"lean-multisig aggregation failed: {exc}") from exc +# This function will change for recursive aggregation verification +# which might additionally require hints. def verify_aggregated_payload( public_keys: Sequence[PublicKey], payload: bytes, From a763fc493f1ccec86d7c24bb6606d196816da5d5 Mon Sep 17 00:00:00 2001 From: anshalshukla Date: Wed, 24 Dec 2025 14:59:23 +0530 Subject: [PATCH 09/12] fix: update aggregation API signature --- packages/testing/src/consensus_testing/keys.py | 4 ++-- .../subspecs/containers/block/block.py | 2 +- .../subspecs/containers/state/state.py | 18 ++++++++++-------- src/lean_spec/subspecs/xmss/aggregation.py | 13 +++++++------ 4 files changed, 20 insertions(+), 17 deletions(-) diff --git a/packages/testing/src/consensus_testing/keys.py b/packages/testing/src/consensus_testing/keys.py index ee2c9b56..a2c5169b 100755 --- a/packages/testing/src/consensus_testing/keys.py +++ b/packages/testing/src/consensus_testing/keys.py @@ -333,13 +333,13 @@ def build_attestation_signatures( # If the caller supplied raw signatures and any are invalid, # aggregation should fail with exception. - payload = aggregate_signatures( + aggregated_signature = aggregate_signatures( public_keys=public_keys, signatures=signatures, message=message, epoch=epoch, ) - proof_blobs.append(LeanAggregatedSignature(data=payload)) + proof_blobs.append(aggregated_signature) return AttestationSignatures(data=proof_blobs) diff --git a/src/lean_spec/subspecs/containers/block/block.py b/src/lean_spec/subspecs/containers/block/block.py index 1d7a4cb8..fd3b9ec9 100644 --- a/src/lean_spec/subspecs/containers/block/block.py +++ b/src/lean_spec/subspecs/containers/block/block.py @@ -192,7 +192,7 @@ def verify_signatures( try: verify_aggregated_payload( public_keys=public_keys, - payload=bytes(aggregated_signature), + payload=aggregated_signature, message=attestation_data_root, epoch=aggregated_attestation.data.slot, ) diff --git a/src/lean_spec/subspecs/containers/state/state.py b/src/lean_spec/subspecs/containers/state/state.py index 5fb7bd81..84440725 100644 --- a/src/lean_spec/subspecs/containers/state/state.py +++ b/src/lean_spec/subspecs/containers/state/state.py @@ -640,13 +640,13 @@ def _aggregate_signatures_from_gossip( sigs.append(sig) pks.append(self.validators[vid].get_pubkey()) - payload = aggregate_signatures( + aggregated_signature = aggregate_signatures( public_keys=pks, signatures=sigs, message=data_root, epoch=epoch, ) - return LeanAggregatedSignature(data=payload) + return aggregated_signature def _common_block_payload( self, @@ -666,20 +666,22 @@ def _common_block_payload( if not first_records: return None - for participants, payload in first_records: + for participants, aggregated_signature in first_records: if participants != target_bits: continue - payload_bytes = bytes(payload) if all( any( - other_participants == target_bits and bytes(other_payload) == payload_bytes - for other_participants, other_payload in block_attestation_signatures.get( - (vid, data_root), [] + ( + other_participants == target_bits + and other_aggregated_signature == aggregated_signature + ) + for other_participants, other_aggregated_signature in ( + block_attestation_signatures.get((vid, data_root), []) ) ) for vid in validator_ids[1:] ): - return LeanAggregatedSignature(data=payload_bytes) + return aggregated_signature return None def _best_block_payload_subset( diff --git a/src/lean_spec/subspecs/xmss/aggregation.py b/src/lean_spec/subspecs/xmss/aggregation.py index dc05b78e..5e2fc9cf 100644 --- a/src/lean_spec/subspecs/xmss/aggregation.py +++ b/src/lean_spec/subspecs/xmss/aggregation.py @@ -16,6 +16,7 @@ from lean_spec.subspecs.xmss.containers import PublicKey from lean_spec.subspecs.xmss.containers import Signature as XmssSignature from lean_spec.types import Uint64 +from lean_spec.types.byte_arrays import LeanAggregatedSignature class LeanMultisigError(RuntimeError): @@ -33,7 +34,7 @@ def aggregate_signatures( signatures: Sequence[XmssSignature], message: bytes, epoch: Uint64, -) -> bytes: +) -> LeanAggregatedSignature: """ Aggregate XMSS signatures using lean-multisig. @@ -44,7 +45,7 @@ def aggregate_signatures( epoch: The epoch in which the signatures were created. Returns: - Raw bytes of the aggregated signature payload. + LeanAggregatedSignature of the aggregated signature payload. Raises: LeanMultisigError: If lean-multisig is unavailable or aggregation fails. @@ -63,7 +64,7 @@ def aggregate_signatures( epoch, test_mode=True, ) - return aggregated_bytes + return LeanAggregatedSignature(data=aggregated_bytes) except Exception as exc: raise LeanMultisigAggregationError(f"lean-multisig aggregation failed: {exc}") from exc @@ -72,7 +73,7 @@ def aggregate_signatures( # which might additionally require hints. def verify_aggregated_payload( public_keys: Sequence[PublicKey], - payload: bytes, + payload: LeanAggregatedSignature, message: bytes, epoch: Uint64, ) -> None: @@ -81,7 +82,7 @@ def verify_aggregated_payload( Args: public_keys: Public keys of the signers, one per original signature. - payload: Raw bytes of the aggregated signature payload. + payload: LeanAggregatedSignature of the aggregated signature payload. message: The 32-byte message that was signed. epoch: The epoch in which the signatures were created. @@ -97,7 +98,7 @@ def verify_aggregated_payload( verify_aggregated_signatures_py( pub_keys_bytes, message, - payload, + payload.encode_bytes(), epoch, test_mode=True, ) From f36ea7a91783b31dae399eb1bdcf95a70446860f Mon Sep 17 00:00:00 2001 From: anshalshukla Date: Fri, 26 Dec 2025 03:35:03 +0530 Subject: [PATCH 10/12] update: block building logic with greedy signature aggregation --- .../test_fixtures/verify_signatures.py | 8 +- .../subspecs/containers/block/types.py | 48 ++- .../subspecs/containers/state/state.py | 338 +++++++++++------- src/lean_spec/subspecs/forkchoice/store.py | 3 +- .../forkchoice/test_store_attestations.py | 174 +++++++++ 5 files changed, 431 insertions(+), 140 deletions(-) diff --git a/packages/testing/src/consensus_testing/test_fixtures/verify_signatures.py b/packages/testing/src/consensus_testing/test_fixtures/verify_signatures.py index 6505b7d5..b999b236 100644 --- a/packages/testing/src/consensus_testing/test_fixtures/verify_signatures.py +++ b/packages/testing/src/consensus_testing/test_fixtures/verify_signatures.py @@ -16,6 +16,7 @@ BlockWithAttestation, SignedBlockWithAttestation, ) +from lean_spec.subspecs.containers.block.types import AttestationSignatures from lean_spec.subspecs.containers.checkpoint import Checkpoint from lean_spec.subspecs.containers.state.state import State from lean_spec.subspecs.koalabear import Fp @@ -188,7 +189,7 @@ def _build_block_from_spec( } # Use State.build_block for core block building (pure spec logic) - final_block, _, _, _ = state.build_block( + final_block, _, _, aggregated_signatures = state.build_block( slot=spec.slot, proposer_index=proposer_index, parent_root=parent_root, @@ -197,9 +198,8 @@ def _build_block_from_spec( block_attestation_signatures={}, ) - attestation_signatures = key_manager.build_attestation_signatures( - final_block.body.attestations, - signature_lookup=gossip_attestation_signatures, + attestation_signatures = AttestationSignatures( + data=aggregated_signatures, ) # Create proposer attestation for this block diff --git a/src/lean_spec/subspecs/containers/block/types.py b/src/lean_spec/subspecs/containers/block/types.py index 807942c3..5ec3c526 100644 --- a/src/lean_spec/subspecs/containers/block/types.py +++ b/src/lean_spec/subspecs/containers/block/types.py @@ -1,10 +1,13 @@ """Block-specific SSZ types for the Lean Ethereum consensus specification.""" +from collections import Counter, defaultdict + from lean_spec.types import SSZList from lean_spec.types.byte_arrays import LeanAggregatedSignature from ...chain.config import VALIDATOR_REGISTRY_LIMIT -from ..attestation import AggregatedAttestation, AttestationData +from ..attestation import AggregatedAttestation +from ..attestation.types import AggregationBits class AggregatedAttestations(SSZList[AggregatedAttestation]): @@ -13,14 +16,41 @@ class AggregatedAttestations(SSZList[AggregatedAttestation]): ELEMENT_TYPE = AggregatedAttestation LIMIT = int(VALIDATOR_REGISTRY_LIMIT) - def has_duplicate_data(self) -> bool: - """Check if any two attestations share the same AttestationData.""" - seen: set[AttestationData] = set() - for attestation in self: - if attestation.data in seen: - return True - seen.add(attestation.data) - return False + def each_duplicate_attestation_has_unique_participant(self) -> bool: + """ + Check if each duplicate aggregated attestation has a unique participant. + + Returns: + True if each duplicate aggregated attestation has a unique participant. + """ + groups: dict[bytes, list[AggregationBits]] = defaultdict(list) + + for att in self: + groups[att.data.data_root_bytes()].append(att.aggregation_bits) + + for bits_list in groups.values(): + if len(bits_list) <= 1: + continue + + counts: Counter[int] = Counter() + + # Pass 1: count participants across the group + for bits in bits_list: + for i, bit in enumerate(bits.data): + if bit: + counts[i] += 1 + + # Pass 2: each attestation must have a participant that appears exactly once + for bits in bits_list: + unique = False + for i, bit in enumerate(bits.data): + if bit and counts[i] == 1: + unique = True + break + if not unique: + return False + + return True class AttestationSignatures(SSZList[LeanAggregatedSignature]): diff --git a/src/lean_spec/subspecs/containers/state/state.py b/src/lean_spec/subspecs/containers/state/state.py index 84440725..a9d89743 100644 --- a/src/lean_spec/subspecs/containers/state/state.py +++ b/src/lean_spec/subspecs/containers/state/state.py @@ -356,21 +356,20 @@ def process_block(self, block: Block) -> "State": Raises: ------ AssertionError - If block contains duplicate AttestationData. + If block contains duplicate aggregated attestations with no unique participant. """ # First process the block header. state = self.process_block_header(block) - # Reject blocks with duplicate attestation data + # Reject blocks that has same aggregated attestation data and no unique participant. # - # Each aggregated attestation in a block must refer to a unique AttestationData. - # Duplicates would allow the same vote to be counted multiple times, breaking - # the integrity of the justification tally. + # Multiple AggregatedAttestations may carry identical AttestationData as long as + # each has at least one validator that is not present in any other. # # This is a protocol-level invariant: honest proposers never include duplicates, # and validators must reject blocks that violate this rule. - assert not block.body.attestations.has_duplicate_data(), ( - "Block contains duplicate AttestationData" + assert block.body.attestations.each_duplicate_attestation_has_unique_participant(), ( + "Block contains duplicate aggregated attestations with no unique participant" ) return state.process_attestations(block.body.attestations) @@ -648,7 +647,7 @@ def _aggregate_signatures_from_gossip( ) return aggregated_signature - def _common_block_payload( + def _aggregate_signatures_from_block_payload( self, validator_ids: list[Uint64], data_root: bytes, @@ -684,46 +683,6 @@ def _common_block_payload( return aggregated_signature return None - def _best_block_payload_subset( - self, - validator_ids: list[Uint64], - data_root: bytes, - block_attestation_signatures: dict[ - tuple[Uint64, bytes], list[tuple[AggregationBits, LeanAggregatedSignature]] - ] - | None = None, - ) -> list[Uint64]: - """ - Find the largest subset of validators that share a cached block payload. - - Returns the validator indices sorted ascending. An empty list is returned when no - compatible payload exists. - """ - if not block_attestation_signatures or not validator_ids: - return [] - - validator_set = frozenset(validator_ids) - - best_participants: set[Uint64] = set() - best_len = 0 - for vid in validator_ids: - for participants, _payload in block_attestation_signatures.get((vid, data_root), ()): - if not participants or not participants.data: - continue - - participant_ids = participants.to_validator_indices() - if not participant_ids: - continue - - if len(participant_ids) <= best_len: - continue - - if set(participant_ids).issubset(validator_set): - best_len = len(participant_ids) - best_participants = set(participant_ids) - - return sorted(best_participants) - def build_block( self, slot: Slot, @@ -737,8 +696,7 @@ def build_block( tuple[Uint64, bytes], list[tuple[AggregationBits, LeanAggregatedSignature]] ] | None = None, - _dropped_attestation_keys: set[tuple[Uint64, bytes]] | None = None, - ) -> tuple[Block, "State", list[Attestation], list[LeanAggregatedSignature]]: + ) -> tuple[Block, "State", list[AggregatedAttestation], list[LeanAggregatedSignature]]: """ Build a valid block on top of this state. @@ -764,18 +722,12 @@ def build_block( signatures. block_attestation_signatures: Map of (validator_id, data_root) to aggregated signature payloads. - _dropped_attestation_keys: Internal accumulator tracking (validator_id, data_root) - pairs that were proven unsignable during this build. Not intended for callers. Returns: Tuple of (Block, post-State, collected attestations, signatures). """ # Initialize empty attestation set for iterative collection. attestations = list(attestations or []) - if _dropped_attestation_keys is None: - dropped_attestation_keys: set[tuple[Uint64, bytes]] = set() - else: - dropped_attestation_keys = _dropped_attestation_keys # Iteratively collect valid attestations using fixed-point algorithm # @@ -809,10 +761,7 @@ def build_block( data = attestation.data validator_id = attestation.validator_id data_root = data.data_root_bytes() - cache_key = (validator_id, data_root) - - if cache_key in dropped_attestation_keys: - continue + attestation_key = (validator_id, data_root) # Skip if target block is unknown if data.head.root not in known_block_roots: @@ -833,11 +782,12 @@ def build_block( # this validator+data. has_gossip_sig = bool( gossip_attestation_signatures - and gossip_attestation_signatures.get(cache_key) is not None + and gossip_attestation_signatures.get(attestation_key) is not None ) has_block_payload = bool( - block_attestation_signatures and block_attestation_signatures.get(cache_key) + block_attestation_signatures + and block_attestation_signatures.get(attestation_key) ) if has_gossip_sig or has_block_payload: @@ -850,81 +800,217 @@ def build_block( # Add new attestations and continue iteration attestations.extend(new_attestations) - # Build aggregated signatures aligned with the block's aggregated attestations. - aggregated_attestations = candidate_block.body.attestations - attestation_signatures: list[LeanAggregatedSignature] = [] - pruned: list[Attestation] = [] + # Compute the aggregated signatures for the attestations. + # If the attestations cannot be aggregated, split it in a greedy way. + aggregated_attestations, aggregated_signatures = ( + self.compute_aggregated_signatures_with_greedy_fallback( + attestations, + gossip_attestation_signatures, + block_attestation_signatures, + ) + ) + + # Update the block with the aggregated attestations + final_block = candidate_block.model_copy( + update={ + "body": BlockBody( + attestations=AggregatedAttestations( + data=aggregated_attestations, + ), + ), + } + ) + + # Store the post state root in the block + final_block = final_block.model_copy( + update={ + "state_root": hash_tree_root(post_state), + } + ) + + return final_block, post_state, aggregated_attestations, aggregated_signatures + + def compute_aggregated_signatures_with_greedy_fallback( + self, + attestations: list[Attestation], + gossip_attestation_signatures: dict[tuple[Uint64, bytes], "Signature"] | None = None, + block_attestation_signatures: dict[ + tuple[Uint64, bytes], list[tuple[AggregationBits, LeanAggregatedSignature]] + ] + | None = None, + ) -> tuple[list[AggregatedAttestation], list[LeanAggregatedSignature]]: + """ + Compute aggregated signatures for a set of attestations. + + If the aggregated signatures cannot be computed, split the attestations greedily to + generate the minimal number of aggregated attestations. - for aggregated in aggregated_attestations: - validator_ids = aggregated.aggregation_bits.to_validator_indices() - data_root = aggregated.data.data_root_bytes() + Args: + attestations: The attestations to compute aggregated signatures for. + gossip_attestation_signatures: Optional per-validator XMSS signatures learned from + gossip, keyed by `(validator_id, data_root)`. + block_attestation_signatures: Optional aggregated signatures learned from blocks, + keyed by `(validator_id, data_root)`. - # Try to aggregate all validators together (best case) - payload = self._aggregate_signatures_from_gossip( - validator_ids, data_root, aggregated.data.slot, gossip_attestation_signatures + Returns: + A tuple of `(aggregated_attestations, aggregated_signatures)`. + """ + final_aggregated_attestations: list[AggregatedAttestation] = [] + final_aggregated_signatures: list[LeanAggregatedSignature] = [] + + # Aggregate all the attestations into a single aggregated attestation. + completely_aggregated_attestations = AggregatedAttestation.aggregate_by_data(attestations) + + # Try to compute the aggregated signatures for the single aggregated attestation. + # + # We will try to compute the aggregated signatures for the completely aggregated + # attestations. + # - either we can find per validator XMSS signatures from gossip, or + # - we can find at least one aggregated payload learned from a block that references + # this validator+data. + # + # If the aggregated signatures cannot be computed, we will split the completely aggregated + # attestations in a greedy way. + for completely_aggregated_attestation in completely_aggregated_attestations: + validator_ids = ( + completely_aggregated_attestation.aggregation_bits.to_validator_indices() ) - if payload is not None: - attestation_signatures.append(payload) - pruned.extend( - [Attestation(validator_id=vid, data=aggregated.data) for vid in validator_ids] - ) + data_root = completely_aggregated_attestation.data.data_root_bytes() + slot = completely_aggregated_attestation.data.slot + + # Try to find per validator XMSS signatures from gossip. + aggregated_signature = self._aggregate_signatures_from_gossip( + validator_ids, + data_root, + slot, + gossip_attestation_signatures, + ) + if aggregated_signature is not None: + final_aggregated_attestations.append(completely_aggregated_attestation) + final_aggregated_signatures.append(aggregated_signature) continue - payload = self._common_block_payload( - validator_ids, data_root, block_attestation_signatures + # Try to find at least one aggregated payload learned from a block that references + # this validator+data. + aggregated_signature = self._aggregate_signatures_from_block_payload( + validator_ids, + data_root, + block_attestation_signatures, ) - if payload is not None: - attestation_signatures.append(payload) - pruned.extend( - [Attestation(validator_id=vid, data=aggregated.data) for vid in validator_ids] - ) + if aggregated_signature is not None: + final_aggregated_attestations.append(completely_aggregated_attestation) + final_aggregated_signatures.append(aggregated_signature) continue - # Cannot provide a payload for the full validator set. - # Keep the largest subset we can sign and drop the rest. The block will be rebuilt - # with this reduced attestation set. - gossip_subset = [ - vid - for vid in validator_ids - if gossip_attestation_signatures - and gossip_attestation_signatures.get((vid, data_root)) is not None - ] - block_subset = self._best_block_payload_subset( - validator_ids, data_root, block_attestation_signatures + # If we have not found any aggregated signatures, we will split the completely + # aggregated attestations in a greedy way. + # Such that we include all the validators with minimal splits in aggregated + # attestations. + ( + splited_aggregated_attestations, + splited_aggregated_signatures, + ) = self.split_aggregated_attestations_greedily( + completely_aggregated_attestation, + gossip_attestation_signatures, + block_attestation_signatures, ) + final_aggregated_attestations.extend(splited_aggregated_attestations) + final_aggregated_signatures.extend(splited_aggregated_signatures) - subset = block_subset - if gossip_subset and len(gossip_subset) > len(subset): - subset = gossip_subset + return final_aggregated_attestations, final_aggregated_signatures - if subset: - pruned.extend( - [Attestation(validator_id=vid, data=aggregated.data) for vid in subset] + def split_aggregated_attestations_greedily( + self, + aggregated_attestation: AggregatedAttestation, + gossip_attestation_signatures: dict[tuple[Uint64, bytes], "Signature"] | None = None, + block_attestation_signatures: dict[ + tuple[Uint64, bytes], list[tuple[AggregationBits, LeanAggregatedSignature]] + ] + | None = None, + ) -> tuple[list[AggregatedAttestation], list[LeanAggregatedSignature]]: + """ + Split an aggregated attestation greedily to cover all validators with minimal splits. + + Args: + aggregated_attestation: The aggregated attestation to split. + gossip_attestation_signatures: Optional per-validator XMSS signatures learned from + gossip, keyed by `(validator_id, data_root)`. + block_attestation_signatures: Optional aggregated signatures learned from blocks, + keyed by `(validator_id, data_root)`. + + Returns: + A tuple of `(split_aggregated_attestations, split_aggregated_signatures)`. + """ + validator_ids = aggregated_attestation.aggregation_bits.to_validator_indices() + data_root = aggregated_attestation.data.data_root_bytes() + slot = aggregated_attestation.data.slot + + split_entries: list[ + tuple[tuple[int, ...], AggregatedAttestation, LeanAggregatedSignature] + ] = [] + + # Try to reuse any per-validator gossip signatures first. + gossip_validator_ids = [ + vid + for vid in validator_ids + if gossip_attestation_signatures + and gossip_attestation_signatures.get((vid, data_root)) is not None + ] + if gossip_validator_ids: + gossip_signature = self._aggregate_signatures_from_gossip( + gossip_validator_ids, + data_root, + slot, + gossip_attestation_signatures, + ) + if gossip_signature is not None: + gossip_att = AggregatedAttestation( + aggregation_bits=AggregationBits.from_validator_indices(gossip_validator_ids), + data=aggregated_attestation.data, ) - if len(subset) < len(validator_ids): - subset_set = set(subset) - for vid in validator_ids: - if vid not in subset_set: - dropped_attestation_keys.add((vid, data_root)) - else: - for vid in validator_ids: - dropped_attestation_keys.add((vid, data_root)) - - # If pruning removed attestations, rerun once with the pruned set to keep - # state_root consistent. - if len(pruned) != len(attestations): - return self.build_block( - slot=slot, - proposer_index=proposer_index, - parent_root=parent_root, - attestations=pruned, - available_attestations=available_attestations, - known_block_roots=known_block_roots, - gossip_attestation_signatures=gossip_attestation_signatures, - block_attestation_signatures=block_attestation_signatures, - _dropped_attestation_keys=dropped_attestation_keys, + participants = tuple( + int(v) for v in gossip_att.aggregation_bits.to_validator_indices() + ) + split_entries.append((participants, gossip_att, gossip_signature)) + + # Add subsets that have block-learned aggregated payloads. + validator_set = set(validator_ids) + if block_attestation_signatures: + for vid in validator_ids: + entries = block_attestation_signatures.get((vid, data_root), ()) + for aggregation_bits, aggregated_signature in entries: + participant_ids = aggregation_bits.to_validator_indices() + if set(participant_ids).issubset(validator_set): + participants = tuple(int(v) for v in participant_ids) + split_entries.append( + ( + participants, + AggregatedAttestation( + aggregation_bits=aggregation_bits, + data=aggregated_attestation.data, + ), + aggregated_signature, + ) + ) + + # Greedy filtering: keep larger validator sets first and break ties deterministically. + split_entries.sort(key=lambda entry: (-len(entry[0]), entry[0])) + filtered_pairs: list[tuple[AggregatedAttestation, LeanAggregatedSignature]] = [] + covered: set[int] = set() + all_participants = {int(v) for v in validator_ids} + for participants, att, sig in split_entries: + new_participants = set(participants) - covered + if not new_participants: + continue + filtered_pairs.append((att, sig)) + covered.update(participants) + + if covered != all_participants: + missing = sorted(all_participants - covered) + raise AssertionError( + f"Cannot aggregate attestations for validators {missing} without signatures" ) - # Store the post state root in the block - final_block = candidate_block.model_copy(update={"state_root": hash_tree_root(post_state)}) - return final_block, post_state, attestations, attestation_signatures + split_aggregated_attestations = [att for att, _ in filtered_pairs] + split_aggregated_signatures = [sig for _, sig in filtered_pairs] + return split_aggregated_attestations, split_aggregated_signatures diff --git a/src/lean_spec/subspecs/forkchoice/store.py b/src/lean_spec/subspecs/forkchoice/store.py index 909307f4..7f557086 100644 --- a/src/lean_spec/subspecs/forkchoice/store.py +++ b/src/lean_spec/subspecs/forkchoice/store.py @@ -555,7 +555,8 @@ def on_block( ) # Copy the block attestation signatures map for updates - new_block_sigs = dict(store.block_attestation_signatures) + # Must deep copy the lists to maintain immutability of previous store snapshots + new_block_sigs = {k: list(v) for k, v in store.block_attestation_signatures.items()} for aggregated_attestation, aggregated_signature in zip( aggregated_attestations, attestation_signatures, strict=True diff --git a/tests/lean_spec/subspecs/forkchoice/test_store_attestations.py b/tests/lean_spec/subspecs/forkchoice/test_store_attestations.py index 917f68f7..b527a15e 100644 --- a/tests/lean_spec/subspecs/forkchoice/test_store_attestations.py +++ b/tests/lean_spec/subspecs/forkchoice/test_store_attestations.py @@ -116,3 +116,177 @@ def test_on_block_processes_multi_validator_aggregations() -> None: assert Uint64(2) in updated_store.latest_known_attestations assert updated_store.latest_known_attestations[Uint64(1)] == attestation_data assert updated_store.latest_known_attestations[Uint64(2)] == attestation_data + + +def test_on_block_preserves_immutability_of_block_attestation_signatures() -> None: + """Verify that Store.on_block doesn't mutate previous store's block_attestation_signatures.""" + key_manager = XmssKeyManager(max_slot=Slot(10)) + validators = Validators( + data=[ + Validator(pubkey=Bytes52(key_manager[Uint64(i)].public.encode_bytes()), index=Uint64(i)) + for i in range(3) + ] + ) + genesis_state = State.generate_genesis(genesis_time=Uint64(0), validators=validators) + genesis_block = Block( + slot=Slot(0), + proposer_index=Uint64(0), + parent_root=Bytes32.zero(), + state_root=hash_tree_root(genesis_state), + body=BlockBody(attestations=AggregatedAttestations(data=[])), + ) + + base_store = Store.get_forkchoice_store(genesis_state, genesis_block) + + # First block: create and process a block with attestations to populate + # `block_attestation_signatures`. + attestation_slot_1 = Slot(1) + attestation_data_1 = base_store.produce_attestation_data(attestation_slot_1) + data_root_1 = attestation_data_1.data_root_bytes() + + attestation_data_map_1 = { + validator_id: attestation_data_1 for validator_id in (Uint64(1), Uint64(2)) + } + gossip_sigs_1 = { + (validator_id, data_root_1): key_manager.sign_attestation_data( + validator_id, attestation_data_1 + ) + for validator_id in (Uint64(1), Uint64(2)) + } + + producer_store_1 = base_store.model_copy( + update={ + "latest_known_attestations": attestation_data_map_1, + "gossip_attestation_signatures": gossip_sigs_1, + } + ) + + proposer_index_1 = Uint64(1) + _, block_1, _ = producer_store_1.produce_block_with_signatures( + attestation_slot_1, + proposer_index_1, + ) + + block_root_1 = hash_tree_root(block_1) + parent_state_1 = producer_store_1.states[block_1.parent_root] + proposer_attestation_1 = Attestation( + validator_id=proposer_index_1, + data=AttestationData( + slot=attestation_slot_1, + head=Checkpoint(root=block_root_1, slot=attestation_slot_1), + target=Checkpoint(root=block_root_1, slot=attestation_slot_1), + source=Checkpoint( + root=block_1.parent_root, + slot=parent_state_1.latest_block_header.slot, + ), + ), + ) + proposer_signature_1 = key_manager.sign_attestation_data( + proposer_attestation_1.validator_id, + proposer_attestation_1.data, + ) + + attestation_signatures_1 = key_manager.build_attestation_signatures(block_1.body.attestations) + + signed_block_1 = SignedBlockWithAttestation( + message=BlockWithAttestation( + block=block_1, + proposer_attestation=proposer_attestation_1, + ), + signature=BlockSignatures( + attestation_signatures=attestation_signatures_1, + proposer_signature=proposer_signature_1, + ), + ) + + # Process first block + block_time_1 = base_store.config.genesis_time + block_1.slot * Uint64(SECONDS_PER_SLOT) + consumer_store = base_store.on_tick(block_time_1, has_proposal=True) + store_after_block_1 = consumer_store.on_block(signed_block_1) + + # Now process a second block that includes attestations for the SAME validators + # This tests the case where we append to existing lists in block_attestation_signatures + attestation_slot_2 = Slot(2) + attestation_data_2 = store_after_block_1.produce_attestation_data(attestation_slot_2) + data_root_2 = attestation_data_2.data_root_bytes() + + attestation_data_map_2 = { + validator_id: attestation_data_2 for validator_id in (Uint64(1), Uint64(2)) + } + gossip_sigs_2 = { + (validator_id, data_root_2): key_manager.sign_attestation_data( + validator_id, attestation_data_2 + ) + for validator_id in (Uint64(1), Uint64(2)) + } + + producer_store_2 = store_after_block_1.model_copy( + update={ + "latest_known_attestations": attestation_data_map_2, + "gossip_attestation_signatures": gossip_sigs_2, + } + ) + + proposer_index_2 = Uint64(2) + _, block_2, _ = producer_store_2.produce_block_with_signatures( + attestation_slot_2, + proposer_index_2, + ) + + block_root_2 = hash_tree_root(block_2) + parent_state_2 = producer_store_2.states[block_2.parent_root] + proposer_attestation_2 = Attestation( + validator_id=proposer_index_2, + data=AttestationData( + slot=attestation_slot_2, + head=Checkpoint(root=block_root_2, slot=attestation_slot_2), + target=Checkpoint(root=block_root_2, slot=attestation_slot_2), + source=Checkpoint( + root=block_2.parent_root, + slot=parent_state_2.latest_block_header.slot, + ), + ), + ) + proposer_signature_2 = key_manager.sign_attestation_data( + proposer_attestation_2.validator_id, + proposer_attestation_2.data, + ) + + attestation_signatures_2 = key_manager.build_attestation_signatures(block_2.body.attestations) + + signed_block_2 = SignedBlockWithAttestation( + message=BlockWithAttestation( + block=block_2, + proposer_attestation=proposer_attestation_2, + ), + signature=BlockSignatures( + attestation_signatures=attestation_signatures_2, + proposer_signature=proposer_signature_2, + ), + ) + + # Advance time and capture state before processing second block + block_time_2 = store_after_block_1.config.genesis_time + block_2.slot * Uint64(SECONDS_PER_SLOT) + store_before_block_2 = store_after_block_1.on_tick(block_time_2, has_proposal=True) + + # Capture the original list lengths for keys that already exist + original_sig_lengths = { + k: len(v) for k, v in store_before_block_2.block_attestation_signatures.items() + } + + # Process the second block + store_after_block_2 = store_before_block_2.on_block(signed_block_2) + + # Verify immutability: the list lengths in store_before_block_2 should not have changed + for key, original_length in original_sig_lengths.items(): + current_length = len(store_before_block_2.block_attestation_signatures[key]) + assert current_length == original_length, ( + f"Immutability violated: list for key {key} grew from {original_length} to " + f"{current_length}" + ) + + # Verify that the updated store has new keys (different attestation data in block 2) + # The key point is that store_before_block_2 wasn't mutated + assert len(store_after_block_2.block_attestation_signatures) >= len( + store_before_block_2.block_attestation_signatures + ) From 09403d97813951b730ebef67333254596f21b71c Mon Sep 17 00:00:00 2001 From: anshalshukla Date: Fri, 26 Dec 2025 04:04:22 +0530 Subject: [PATCH 11/12] fix: make names intuitive and add type alias --- .../testing/src/consensus_testing/keys.py | 3 +- .../test_fixtures/fork_choice.py | 13 ++- .../test_fixtures/state_transition.py | 8 +- .../test_fixtures/verify_signatures.py | 6 +- .../subspecs/containers/state/__init__.py | 12 ++ .../subspecs/containers/state/state.py | 105 ++++++++---------- .../subspecs/containers/state/types.py | 35 +++++- src/lean_spec/subspecs/forkchoice/store.py | 47 ++++---- .../forkchoice/test_store_attestations.py | 26 ++--- .../subspecs/forkchoice/test_validator.py | 18 +-- 10 files changed, 154 insertions(+), 119 deletions(-) diff --git a/packages/testing/src/consensus_testing/keys.py b/packages/testing/src/consensus_testing/keys.py index a2c5169b..fb443026 100755 --- a/packages/testing/src/consensus_testing/keys.py +++ b/packages/testing/src/consensus_testing/keys.py @@ -45,6 +45,7 @@ AttestationSignatures, ) from lean_spec.subspecs.containers.slot import Slot +from lean_spec.subspecs.containers.state.types import AttestationSignatureKey from lean_spec.subspecs.xmss.aggregation import aggregate_signatures from lean_spec.subspecs.xmss.containers import PublicKey, SecretKey, Signature from lean_spec.subspecs.xmss.interface import ( @@ -308,7 +309,7 @@ def sign_attestation_data( def build_attestation_signatures( self, aggregated_attestations: AggregatedAttestations, - signature_lookup: Mapping[tuple[Uint64, bytes], Signature] | None = None, + signature_lookup: Mapping[AttestationSignatureKey, Signature] | None = None, ) -> AttestationSignatures: """ Build `AttestationSignatures` for already-aggregated attestations. diff --git a/packages/testing/src/consensus_testing/test_fixtures/fork_choice.py b/packages/testing/src/consensus_testing/test_fixtures/fork_choice.py index 301d4951..0fd59154 100644 --- a/packages/testing/src/consensus_testing/test_fixtures/fork_choice.py +++ b/packages/testing/src/consensus_testing/test_fixtures/fork_choice.py @@ -26,6 +26,7 @@ from lean_spec.subspecs.containers.slot import Slot from lean_spec.subspecs.containers.state import Validators from lean_spec.subspecs.containers.state.state import State +from lean_spec.subspecs.containers.state.types import AttestationSignatureKey from lean_spec.subspecs.forkchoice import Store from lean_spec.subspecs.koalabear import Fp from lean_spec.subspecs.ssz import hash_tree_root @@ -308,8 +309,8 @@ def _build_block_from_spec( spec, store, block_registry, parent_root, key_manager ) - gossip_attestation_signatures = dict(store.gossip_attestation_signatures) - gossip_attestation_signatures.update(attestation_signatures) + gossip_signatures = dict(store.gossip_signatures) + gossip_signatures.update(attestation_signatures) # Use State.build_block for core block building (pure spec logic) parent_state = store.states[parent_root] @@ -318,8 +319,8 @@ def _build_block_from_spec( proposer_index=proposer_index, parent_root=parent_root, attestations=attestations, - gossip_attestation_signatures=gossip_attestation_signatures, - block_attestation_signatures=store.block_attestation_signatures, + gossip_signatures=gossip_signatures, + aggregated_payloads=store.aggregated_payloads, ) # Create proposer attestation for this block @@ -404,14 +405,14 @@ def _build_attestations_from_spec( block_registry: dict[str, Block], parent_root: Bytes32, key_manager: XmssKeyManager, - ) -> tuple[list[Attestation], dict[tuple[Uint64, bytes], Signature]]: + ) -> tuple[list[Attestation], dict[AttestationSignatureKey, Signature]]: """Build attestations list from BlockSpec and their signatures.""" if spec.attestations is None: return [], {} parent_state = store.states[parent_root] attestations = [] - signature_lookup: dict[tuple[Uint64, bytes], Signature] = {} + signature_lookup: dict[AttestationSignatureKey, Signature] = {} for att_spec in spec.attestations: if isinstance(att_spec, SignedAttestationSpec): diff --git a/packages/testing/src/consensus_testing/test_fixtures/state_transition.py b/packages/testing/src/consensus_testing/test_fixtures/state_transition.py index 7e41a548..7cb55c62 100644 --- a/packages/testing/src/consensus_testing/test_fixtures/state_transition.py +++ b/packages/testing/src/consensus_testing/test_fixtures/state_transition.py @@ -261,7 +261,7 @@ def _build_block_from_spec(self, spec: BlockSpec, state: State) -> tuple[Block, if plain_attestations: key_manager = get_shared_key_manager(max_slot=spec.slot) - gossip_attestation_signatures = { + gossip_signatures = { (att.validator_id, att.data.data_root_bytes()): key_manager.sign_attestation_data( att.validator_id, att.data, @@ -269,14 +269,14 @@ def _build_block_from_spec(self, spec: BlockSpec, state: State) -> tuple[Block, for att in plain_attestations } else: - gossip_attestation_signatures = {} + gossip_signatures = {} block, post_state, _, _ = state.build_block( slot=spec.slot, proposer_index=proposer_index, parent_root=parent_root, attestations=plain_attestations, - gossip_attestation_signatures=gossip_attestation_signatures, - block_attestation_signatures={}, + gossip_signatures=gossip_signatures, + aggregated_payloads={}, ) return block, post_state diff --git a/packages/testing/src/consensus_testing/test_fixtures/verify_signatures.py b/packages/testing/src/consensus_testing/test_fixtures/verify_signatures.py index b999b236..5a9d8cdc 100644 --- a/packages/testing/src/consensus_testing/test_fixtures/verify_signatures.py +++ b/packages/testing/src/consensus_testing/test_fixtures/verify_signatures.py @@ -183,7 +183,7 @@ def _build_block_from_spec( # Provide signatures to State.build_block so it can include attestations during # fixed-point collection when available_attestations/known_block_roots are used. # This might contain invalid signatures as we are not validating them here. - gossip_attestation_signatures = { + gossip_signatures = { (att.validator_id, att.data.data_root_bytes()): sig for att, sig in zip(attestations, attestation_signature_inputs, strict=True) } @@ -194,8 +194,8 @@ def _build_block_from_spec( proposer_index=proposer_index, parent_root=parent_root, attestations=attestations, - gossip_attestation_signatures=gossip_attestation_signatures, - block_attestation_signatures={}, + gossip_signatures=gossip_signatures, + aggregated_payloads={}, ) attestation_signatures = AttestationSignatures( diff --git a/src/lean_spec/subspecs/containers/state/__init__.py b/src/lean_spec/subspecs/containers/state/__init__.py index dffe6d2c..8fe22bb6 100644 --- a/src/lean_spec/subspecs/containers/state/__init__.py +++ b/src/lean_spec/subspecs/containers/state/__init__.py @@ -2,18 +2,30 @@ from .state import State from .types import ( + AggregatedSignaturePayload, + AggregatedSignaturePayloads, + AttestationsByValidator, + AttestationSignatureKey, + BlockLookup, HistoricalBlockHashes, JustificationRoots, JustificationValidators, JustifiedSlots, + StateLookup, Validators, ) __all__ = [ "State", + "AggregatedSignaturePayload", + "AggregatedSignaturePayloads", + "AttestationSignatureKey", + "AttestationsByValidator", + "BlockLookup", "HistoricalBlockHashes", "JustificationRoots", "JustificationValidators", "JustifiedSlots", + "StateLookup", "Validators", ] diff --git a/src/lean_spec/subspecs/containers/state/state.py b/src/lean_spec/subspecs/containers/state/state.py index a9d89743..9a138d87 100644 --- a/src/lean_spec/subspecs/containers/state/state.py +++ b/src/lean_spec/subspecs/containers/state/state.py @@ -22,6 +22,8 @@ from ..config import Config from ..slot import Slot from .types import ( + AggregatedSignaturePayloads, + AttestationSignatureKey, HistoricalBlockHashes, JustificationRoots, JustificationValidators, @@ -624,16 +626,16 @@ def _aggregate_signatures_from_gossip( validator_ids: list[Uint64], data_root: bytes, epoch: Slot, - gossip_attestation_signatures: dict[tuple[Uint64, bytes], "Signature"] | None = None, + gossip_signatures: dict[AttestationSignatureKey, "Signature"] | None = None, ) -> LeanAggregatedSignature | None: """Aggregate per-validator XMSS signatures into a single payload, if available.""" - if not gossip_attestation_signatures or not validator_ids: + if not gossip_signatures or not validator_ids: return None sigs: list[Signature] = [] pks = [] for vid in validator_ids: - sig = gossip_attestation_signatures.get((vid, data_root)) + sig = gossip_signatures.get((vid, data_root)) if sig is None: return None sigs.append(sig) @@ -651,17 +653,15 @@ def _aggregate_signatures_from_block_payload( self, validator_ids: list[Uint64], data_root: bytes, - block_attestation_signatures: dict[ - tuple[Uint64, bytes], list[tuple[AggregationBits, LeanAggregatedSignature]] - ] + aggregated_payloads: dict[AttestationSignatureKey, AggregatedSignaturePayloads] | None = None, ) -> LeanAggregatedSignature | None: """Find a single aggregated payload shared by all validators in this group.""" - if not block_attestation_signatures or not validator_ids: + if not aggregated_payloads or not validator_ids: return None target_bits = AggregationBits.from_validator_indices(validator_ids) - first_records = block_attestation_signatures.get((validator_ids[0], data_root), []) + first_records = aggregated_payloads.get((validator_ids[0], data_root), []) if not first_records: return None @@ -675,7 +675,7 @@ def _aggregate_signatures_from_block_payload( and other_aggregated_signature == aggregated_signature ) for other_participants, other_aggregated_signature in ( - block_attestation_signatures.get((vid, data_root), []) + aggregated_payloads.get((vid, data_root), []) ) ) for vid in validator_ids[1:] @@ -691,10 +691,8 @@ def build_block( attestations: list[Attestation] | None = None, available_attestations: Iterable[Attestation] | None = None, known_block_roots: AbstractSet[Bytes32] | None = None, - gossip_attestation_signatures: dict[tuple[Uint64, bytes], "Signature"] | None = None, - block_attestation_signatures: dict[ - tuple[Uint64, bytes], list[tuple[AggregationBits, LeanAggregatedSignature]] - ] + gossip_signatures: dict[AttestationSignatureKey, "Signature"] | None = None, + aggregated_payloads: dict[AttestationSignatureKey, AggregatedSignaturePayloads] | None = None, ) -> tuple[Block, "State", list[AggregatedAttestation], list[LeanAggregatedSignature]]: """ @@ -718,10 +716,8 @@ def build_block( attestations: Initial attestations to include. available_attestations: Pool of attestations to collect from. known_block_roots: Set of known block roots for attestation validation. - gossip_attestation_signatures: Map of (validator_id, data_root) to XMSS - signatures. - block_attestation_signatures: Map of (validator_id, data_root) to aggregated - signature payloads. + gossip_signatures: Per-validator XMSS signatures learned from gossip. + aggregated_payloads: Aggregated signature payloads learned from blocks. Returns: Tuple of (Block, post-State, collected attestations, signatures). @@ -781,13 +777,11 @@ def build_block( # - at least one aggregated payload learned from a block that references # this validator+data. has_gossip_sig = bool( - gossip_attestation_signatures - and gossip_attestation_signatures.get(attestation_key) is not None + gossip_signatures and gossip_signatures.get(attestation_key) is not None ) has_block_payload = bool( - block_attestation_signatures - and block_attestation_signatures.get(attestation_key) + aggregated_payloads and aggregated_payloads.get(attestation_key) ) if has_gossip_sig or has_block_payload: @@ -802,12 +796,10 @@ def build_block( # Compute the aggregated signatures for the attestations. # If the attestations cannot be aggregated, split it in a greedy way. - aggregated_attestations, aggregated_signatures = ( - self.compute_aggregated_signatures_with_greedy_fallback( - attestations, - gossip_attestation_signatures, - block_attestation_signatures, - ) + aggregated_attestations, aggregated_signatures = self.compute_aggregated_signatures( + attestations, + gossip_signatures, + aggregated_payloads, ) # Update the block with the aggregated attestations @@ -830,27 +822,23 @@ def build_block( return final_block, post_state, aggregated_attestations, aggregated_signatures - def compute_aggregated_signatures_with_greedy_fallback( + def compute_aggregated_signatures( self, attestations: list[Attestation], - gossip_attestation_signatures: dict[tuple[Uint64, bytes], "Signature"] | None = None, - block_attestation_signatures: dict[ - tuple[Uint64, bytes], list[tuple[AggregationBits, LeanAggregatedSignature]] - ] + gossip_signatures: dict[AttestationSignatureKey, "Signature"] | None = None, + aggregated_payloads: dict[AttestationSignatureKey, AggregatedSignaturePayloads] | None = None, ) -> tuple[list[AggregatedAttestation], list[LeanAggregatedSignature]]: """ Compute aggregated signatures for a set of attestations. - If the aggregated signatures cannot be computed, split the attestations greedily to + Tries to aggregate all attestations together. If that fails, splits them greedily to generate the minimal number of aggregated attestations. Args: attestations: The attestations to compute aggregated signatures for. - gossip_attestation_signatures: Optional per-validator XMSS signatures learned from - gossip, keyed by `(validator_id, data_root)`. - block_attestation_signatures: Optional aggregated signatures learned from blocks, - keyed by `(validator_id, data_root)`. + gossip_signatures: Optional per-validator XMSS signatures learned from gossip. + aggregated_payloads: Optional aggregated signature payloads learned from blocks. Returns: A tuple of `(aggregated_attestations, aggregated_signatures)`. @@ -883,7 +871,7 @@ def compute_aggregated_signatures_with_greedy_fallback( validator_ids, data_root, slot, - gossip_attestation_signatures, + gossip_signatures, ) if aggregated_signature is not None: final_aggregated_attestations.append(completely_aggregated_attestation) @@ -895,48 +883,44 @@ def compute_aggregated_signatures_with_greedy_fallback( aggregated_signature = self._aggregate_signatures_from_block_payload( validator_ids, data_root, - block_attestation_signatures, + aggregated_payloads, ) if aggregated_signature is not None: final_aggregated_attestations.append(completely_aggregated_attestation) final_aggregated_signatures.append(aggregated_signature) continue - # If we have not found any aggregated signatures, we will split the completely - # aggregated attestations in a greedy way. - # Such that we include all the validators with minimal splits in aggregated - # attestations. + # If we have not found any aggregated signatures, split the attestations to cover + # all validators with minimal splits. ( splited_aggregated_attestations, splited_aggregated_signatures, - ) = self.split_aggregated_attestations_greedily( + ) = self.split_aggregated_attestations( completely_aggregated_attestation, - gossip_attestation_signatures, - block_attestation_signatures, + gossip_signatures, + aggregated_payloads, ) final_aggregated_attestations.extend(splited_aggregated_attestations) final_aggregated_signatures.extend(splited_aggregated_signatures) return final_aggregated_attestations, final_aggregated_signatures - def split_aggregated_attestations_greedily( + def split_aggregated_attestations( self, aggregated_attestation: AggregatedAttestation, - gossip_attestation_signatures: dict[tuple[Uint64, bytes], "Signature"] | None = None, - block_attestation_signatures: dict[ - tuple[Uint64, bytes], list[tuple[AggregationBits, LeanAggregatedSignature]] - ] + gossip_signatures: dict[AttestationSignatureKey, "Signature"] | None = None, + aggregated_payloads: dict[AttestationSignatureKey, AggregatedSignaturePayloads] | None = None, ) -> tuple[list[AggregatedAttestation], list[LeanAggregatedSignature]]: """ - Split an aggregated attestation greedily to cover all validators with minimal splits. + Split an aggregated attestation to cover all validators with minimal splits. + + Uses a greedy algorithm to find the minimal set of signature groups. Args: aggregated_attestation: The aggregated attestation to split. - gossip_attestation_signatures: Optional per-validator XMSS signatures learned from - gossip, keyed by `(validator_id, data_root)`. - block_attestation_signatures: Optional aggregated signatures learned from blocks, - keyed by `(validator_id, data_root)`. + gossip_signatures: Optional per-validator XMSS signatures learned from gossip. + aggregated_payloads: Optional aggregated signature payloads learned from blocks. Returns: A tuple of `(split_aggregated_attestations, split_aggregated_signatures)`. @@ -953,15 +937,14 @@ def split_aggregated_attestations_greedily( gossip_validator_ids = [ vid for vid in validator_ids - if gossip_attestation_signatures - and gossip_attestation_signatures.get((vid, data_root)) is not None + if gossip_signatures and gossip_signatures.get((vid, data_root)) is not None ] if gossip_validator_ids: gossip_signature = self._aggregate_signatures_from_gossip( gossip_validator_ids, data_root, slot, - gossip_attestation_signatures, + gossip_signatures, ) if gossip_signature is not None: gossip_att = AggregatedAttestation( @@ -975,9 +958,9 @@ def split_aggregated_attestations_greedily( # Add subsets that have block-learned aggregated payloads. validator_set = set(validator_ids) - if block_attestation_signatures: + if aggregated_payloads: for vid in validator_ids: - entries = block_attestation_signatures.get((vid, data_root), ()) + entries = aggregated_payloads.get((vid, data_root), ()) for aggregation_bits, aggregated_signature in entries: participant_ids = aggregation_bits.to_validator_indices() if set(participant_ids).issubset(validator_set): diff --git a/src/lean_spec/subspecs/containers/state/types.py b/src/lean_spec/subspecs/containers/state/types.py index a4395cad..140845c2 100644 --- a/src/lean_spec/subspecs/containers/state/types.py +++ b/src/lean_spec/subspecs/containers/state/types.py @@ -1,11 +1,44 @@ """State-specific SSZ types for the Lean Ethereum consensus specification.""" +from __future__ import annotations + +from typing import TYPE_CHECKING + from lean_spec.subspecs.chain.config import DEVNET_CONFIG -from lean_spec.types import Bytes32, SSZList +from lean_spec.types import Bytes32, SSZList, Uint64 from lean_spec.types.bitfields import BaseBitlist +from lean_spec.types.byte_arrays import LeanAggregatedSignature +from ..attestation import AggregationBits from ..validator import Validator +if TYPE_CHECKING: + from .state import State + +# Type aliases for signature aggregation +AttestationSignatureKey = tuple[Uint64, bytes] +"""Key type for looking up signatures: (validator_id, attestation_data_root).""" + +AggregatedSignaturePayload = tuple[AggregationBits, LeanAggregatedSignature] +"""Aggregated signature payload with its participant bitlist.""" + +AggregatedSignaturePayloads = list[AggregatedSignaturePayload] +"""List of aggregated signature payloads with their participant bitlists.""" + + +# Type aliases for common dict patterns +from ..attestation import AttestationData # noqa: E402 +from ..block import Block # noqa: E402 + +BlockLookup = dict[Bytes32, Block] +"""Mapping from block root to Block objects.""" + +StateLookup = dict[Bytes32, "State"] +"""Mapping from state root to State objects.""" + +AttestationsByValidator = dict[Uint64, AttestationData] +"""Mapping from validator index to attestation data.""" + class HistoricalBlockHashes(SSZList[Bytes32]): """List of historical block root hashes up to historical_roots_limit.""" diff --git a/src/lean_spec/subspecs/forkchoice/store.py b/src/lean_spec/subspecs/forkchoice/store.py index 7f557086..64f3806b 100644 --- a/src/lean_spec/subspecs/forkchoice/store.py +++ b/src/lean_spec/subspecs/forkchoice/store.py @@ -33,6 +33,13 @@ State, ) from lean_spec.subspecs.containers.slot import Slot +from lean_spec.subspecs.containers.state.types import ( + AggregatedSignaturePayloads, + AttestationsByValidator, + AttestationSignatureKey, + BlockLookup, + StateLookup, +) from lean_spec.subspecs.ssz.hash import hash_tree_root from lean_spec.subspecs.xmss.containers import Signature from lean_spec.subspecs.xmss.interface import TARGET_SIGNATURE_SCHEME, GeneralizedXmssScheme @@ -103,7 +110,7 @@ class Store(Container): Fork choice will never revert finalized history. """ - blocks: Dict[Bytes32, Block] = {} + blocks: BlockLookup = {} """ Mapping from block root to Block objects. @@ -112,7 +119,7 @@ class Store(Container): Every block that might participate in fork choice must appear here. """ - states: Dict[Bytes32, State] = {} + states: StateLookup = {} """ Mapping from state root to State objects. @@ -122,7 +129,7 @@ class Store(Container): `Store`'s latest justified and latest finalized checkpoints. """ - latest_known_attestations: Dict[Uint64, AttestationData] = {} + latest_known_attestations: AttestationsByValidator = {} """ Latest attestation data by validator that have been processed. @@ -131,7 +138,7 @@ class Store(Container): - Only stores the attestation data, not signatures. """ - latest_new_attestations: Dict[Uint64, AttestationData] = {} + latest_new_attestations: AttestationsByValidator = {} """ Latest attestation data by validator that are pending processing. @@ -141,16 +148,16 @@ class Store(Container): - Only stores the attestation data, not signatures. """ - gossip_attestation_signatures: Dict[tuple[Uint64, bytes], Signature] = {} + gossip_signatures: Dict[AttestationSignatureKey, Signature] = {} """ - Map of validator id and attestation root to the XMSS signature. + Per-validator XMSS signatures learned from gossip. + + Keyed by (validator_id, attestation_data_root). """ - block_attestation_signatures: Dict[ - tuple[Uint64, bytes], list[tuple[AggregationBits, LeanAggregatedSignature]] - ] = {} + aggregated_payloads: Dict[AttestationSignatureKey, AggregatedSignaturePayloads] = {} """ - Aggregated signature payloads for attestations from blocks. + Aggregated signature payloads learned from blocks. - Keyed by (validator_id, attestation_data_root). - Values are lists of (aggregation bits, payload) tuples so we know exactly which @@ -312,14 +319,14 @@ def on_gossip_attestation( ), "Signature verification failed" # Store signature for later lookup during block building - new_gossip_sigs = dict(self.gossip_attestation_signatures) + new_gossip_sigs = dict(self.gossip_signatures) new_gossip_sigs[(validator_id, attestation_data.data_root_bytes())] = signature # Process the attestation data store = self.on_attestation(attestation=attestation, is_from_block=False) # Return store with updated signature map - return store.model_copy(update={"gossip_attestation_signatures": new_gossip_sigs}) + return store.model_copy(update={"gossip_signatures": new_gossip_sigs}) def on_attestation( self, @@ -554,9 +561,9 @@ def on_block( "Attestation signature groups must match aggregated attestations" ) - # Copy the block attestation signatures map for updates + # Copy the aggregated signature payloads map for updates # Must deep copy the lists to maintain immutability of previous store snapshots - new_block_sigs = {k: list(v) for k, v in store.block_attestation_signatures.items()} + new_block_sigs = {k: list(v) for k, v in store.aggregated_payloads.items()} for aggregated_attestation, aggregated_signature in zip( aggregated_attestations, attestation_signatures, strict=True @@ -584,8 +591,8 @@ def on_block( is_from_block=True, ) - # Update store with new block attestation signatures - store = store.model_copy(update={"block_attestation_signatures": new_block_sigs}) + # Update store with new aggregated signature payloads + store = store.model_copy(update={"aggregated_payloads": new_block_sigs}) # Update forkchoice head based on new block and attestations # @@ -603,7 +610,7 @@ def on_block( # # We also store the proposer's signature for potential future block building. proposer_data_root = proposer_attestation.data.data_root_bytes() - new_gossip_sigs = dict(store.gossip_attestation_signatures) + new_gossip_sigs = dict(store.gossip_signatures) new_gossip_sigs[(proposer_attestation.validator_id, proposer_data_root)] = ( signed_block_with_attestation.signature.proposer_signature ) @@ -614,7 +621,7 @@ def on_block( ) # Update store with proposer signature - store = store.model_copy(update={"gossip_attestation_signatures": new_gossip_sigs}) + store = store.model_copy(update={"gossip_signatures": new_gossip_sigs}) return store @@ -1094,8 +1101,8 @@ def produce_block_with_signatures( parent_root=head_root, available_attestations=available_attestations, known_block_roots=set(store.blocks.keys()), - gossip_attestation_signatures=store.gossip_attestation_signatures, - block_attestation_signatures=store.block_attestation_signatures, + gossip_signatures=store.gossip_signatures, + aggregated_payloads=store.aggregated_payloads, ) # Store block and state immutably diff --git a/tests/lean_spec/subspecs/forkchoice/test_store_attestations.py b/tests/lean_spec/subspecs/forkchoice/test_store_attestations.py index b527a15e..c96f87fb 100644 --- a/tests/lean_spec/subspecs/forkchoice/test_store_attestations.py +++ b/tests/lean_spec/subspecs/forkchoice/test_store_attestations.py @@ -56,7 +56,7 @@ def test_on_block_processes_multi_validator_aggregations() -> None: validator_id: attestation_data for validator_id in (Uint64(1), Uint64(2)) } - # Store signatures in gossip_attestation_signatures + # Store signatures in gossip_signatures data_root = attestation_data.data_root_bytes() gossip_sigs = { (validator_id, data_root): key_manager.sign_attestation_data(validator_id, attestation_data) @@ -66,7 +66,7 @@ def test_on_block_processes_multi_validator_aggregations() -> None: producer_store = base_store.model_copy( update={ "latest_known_attestations": attestation_data_map, - "gossip_attestation_signatures": gossip_sigs, + "gossip_signatures": gossip_sigs, } ) @@ -118,8 +118,8 @@ def test_on_block_processes_multi_validator_aggregations() -> None: assert updated_store.latest_known_attestations[Uint64(2)] == attestation_data -def test_on_block_preserves_immutability_of_block_attestation_signatures() -> None: - """Verify that Store.on_block doesn't mutate previous store's block_attestation_signatures.""" +def test_on_block_preserves_immutability_of_aggregated_payloads() -> None: + """Verify that Store.on_block doesn't mutate previous store's aggregated_payloads.""" key_manager = XmssKeyManager(max_slot=Slot(10)) validators = Validators( data=[ @@ -139,7 +139,7 @@ def test_on_block_preserves_immutability_of_block_attestation_signatures() -> No base_store = Store.get_forkchoice_store(genesis_state, genesis_block) # First block: create and process a block with attestations to populate - # `block_attestation_signatures`. + # `aggregated_payloads`. attestation_slot_1 = Slot(1) attestation_data_1 = base_store.produce_attestation_data(attestation_slot_1) data_root_1 = attestation_data_1.data_root_bytes() @@ -157,7 +157,7 @@ def test_on_block_preserves_immutability_of_block_attestation_signatures() -> No producer_store_1 = base_store.model_copy( update={ "latest_known_attestations": attestation_data_map_1, - "gossip_attestation_signatures": gossip_sigs_1, + "gossip_signatures": gossip_sigs_1, } ) @@ -205,7 +205,7 @@ def test_on_block_preserves_immutability_of_block_attestation_signatures() -> No store_after_block_1 = consumer_store.on_block(signed_block_1) # Now process a second block that includes attestations for the SAME validators - # This tests the case where we append to existing lists in block_attestation_signatures + # This tests the case where we append to existing lists in aggregated_payloads attestation_slot_2 = Slot(2) attestation_data_2 = store_after_block_1.produce_attestation_data(attestation_slot_2) data_root_2 = attestation_data_2.data_root_bytes() @@ -223,7 +223,7 @@ def test_on_block_preserves_immutability_of_block_attestation_signatures() -> No producer_store_2 = store_after_block_1.model_copy( update={ "latest_known_attestations": attestation_data_map_2, - "gossip_attestation_signatures": gossip_sigs_2, + "gossip_signatures": gossip_sigs_2, } ) @@ -270,16 +270,14 @@ def test_on_block_preserves_immutability_of_block_attestation_signatures() -> No store_before_block_2 = store_after_block_1.on_tick(block_time_2, has_proposal=True) # Capture the original list lengths for keys that already exist - original_sig_lengths = { - k: len(v) for k, v in store_before_block_2.block_attestation_signatures.items() - } + original_sig_lengths = {k: len(v) for k, v in store_before_block_2.aggregated_payloads.items()} # Process the second block store_after_block_2 = store_before_block_2.on_block(signed_block_2) # Verify immutability: the list lengths in store_before_block_2 should not have changed for key, original_length in original_sig_lengths.items(): - current_length = len(store_before_block_2.block_attestation_signatures[key]) + current_length = len(store_before_block_2.aggregated_payloads[key]) assert current_length == original_length, ( f"Immutability violated: list for key {key} grew from {original_length} to " f"{current_length}" @@ -287,6 +285,6 @@ def test_on_block_preserves_immutability_of_block_attestation_signatures() -> No # Verify that the updated store has new keys (different attestation data in block 2) # The key point is that store_before_block_2 wasn't mutated - assert len(store_after_block_2.block_attestation_signatures) >= len( - store_before_block_2.block_attestation_signatures + assert len(store_after_block_2.aggregated_payloads) >= len( + store_before_block_2.aggregated_payloads ) diff --git a/tests/lean_spec/subspecs/forkchoice/test_validator.py b/tests/lean_spec/subspecs/forkchoice/test_validator.py index df956610..afbe2a20 100644 --- a/tests/lean_spec/subspecs/forkchoice/test_validator.py +++ b/tests/lean_spec/subspecs/forkchoice/test_validator.py @@ -195,12 +195,12 @@ def test_produce_block_with_attestations(self, sample_store: Store) -> None: ) sample_store.latest_known_attestations[Uint64(5)] = signed_5.message sample_store.latest_known_attestations[Uint64(6)] = signed_6.message - sample_store.gossip_attestation_signatures[ - (Uint64(5), signed_5.message.data_root_bytes()) - ] = signed_5.signature - sample_store.gossip_attestation_signatures[ - (Uint64(6), signed_6.message.data_root_bytes()) - ] = signed_6.signature + sample_store.gossip_signatures[(Uint64(5), signed_5.message.data_root_bytes())] = ( + signed_5.signature + ) + sample_store.gossip_signatures[(Uint64(6), signed_6.message.data_root_bytes())] = ( + signed_6.signature + ) slot = Slot(2) validator_idx = Uint64(2) # Proposer for slot 2 @@ -291,9 +291,9 @@ def test_produce_block_state_consistency(self, sample_store: Store) -> None: target=sample_store.get_attestation_target(), ) sample_store.latest_known_attestations[Uint64(7)] = signed_7.message - sample_store.gossip_attestation_signatures[ - (Uint64(7), signed_7.message.data_root_bytes()) - ] = signed_7.signature + sample_store.gossip_signatures[(Uint64(7), signed_7.message.data_root_bytes())] = ( + signed_7.signature + ) store, block, _signatures = sample_store.produce_block_with_signatures( slot, From a36f5066e303cf19e715dd6e432f814ae461c101 Mon Sep 17 00:00:00 2001 From: anshalshukla Date: Fri, 26 Dec 2025 05:02:38 +0530 Subject: [PATCH 12/12] add: extensive testing --- .../subspecs/containers/test_block_types.py | 269 +++++++ .../containers/test_state_aggregation.py | 750 ++++++++++++++++++ 2 files changed, 1019 insertions(+) create mode 100644 tests/lean_spec/subspecs/containers/test_block_types.py create mode 100644 tests/lean_spec/subspecs/containers/test_state_aggregation.py diff --git a/tests/lean_spec/subspecs/containers/test_block_types.py b/tests/lean_spec/subspecs/containers/test_block_types.py new file mode 100644 index 00000000..c53c28b3 --- /dev/null +++ b/tests/lean_spec/subspecs/containers/test_block_types.py @@ -0,0 +1,269 @@ +"""Tests for block-specific SSZ types and validation methods.""" + +import pytest + +from lean_spec.subspecs.containers.attestation import ( + AggregatedAttestation, + AggregationBits, + AttestationData, +) +from lean_spec.subspecs.containers.block.types import AggregatedAttestations +from lean_spec.subspecs.containers.checkpoint import Checkpoint +from lean_spec.subspecs.containers.slot import Slot +from lean_spec.types import Boolean, Bytes32, Uint64 + + +def make_attestation_data(slot: int) -> AttestationData: + """Create deterministic attestation data for testing.""" + return AttestationData( + slot=Slot(slot), + head=Checkpoint(root=Bytes32.zero(), slot=Slot(slot)), + target=Checkpoint(root=Bytes32.zero(), slot=Slot(slot)), + source=Checkpoint(root=Bytes32.zero(), slot=Slot(slot - 1)), + ) + + +def make_aggregation_bits(validator_indices: list[int]) -> AggregationBits: + """Create aggregation bits from validator indices.""" + return AggregationBits.from_validator_indices([Uint64(i) for i in validator_indices]) + + +class TestEachDuplicateAttestationHasUniqueParticipant: + """Test the each_duplicate_attestation_has_unique_participant validation method.""" + + def test_empty_attestations_list(self) -> None: + """Empty attestations list should return True.""" + attestations = AggregatedAttestations(data=[]) + assert attestations.each_duplicate_attestation_has_unique_participant() is True + + def test_single_attestation(self) -> None: + """Single attestation should return True (no duplicates).""" + att_data = make_attestation_data(slot=1) + attestations = AggregatedAttestations( + data=[ + AggregatedAttestation( + aggregation_bits=make_aggregation_bits([0, 1]), + data=att_data, + ) + ] + ) + assert attestations.each_duplicate_attestation_has_unique_participant() is True + + def test_multiple_attestations_different_data(self) -> None: + """Multiple attestations with different data should return True.""" + att_data1 = make_attestation_data(slot=1) + att_data2 = make_attestation_data(slot=2) + attestations = AggregatedAttestations( + data=[ + AggregatedAttestation( + aggregation_bits=make_aggregation_bits([0, 1]), + data=att_data1, + ), + AggregatedAttestation( + aggregation_bits=make_aggregation_bits([0, 1]), + data=att_data2, + ), + ] + ) + assert attestations.each_duplicate_attestation_has_unique_participant() is True + + def test_duplicates_with_all_unique_participants(self) -> None: + """Duplicates where each has unique participant should return True.""" + att_data = make_attestation_data(slot=1) + attestations = AggregatedAttestations( + data=[ + AggregatedAttestation( + aggregation_bits=make_aggregation_bits([0, 1]), # unique: 0 + data=att_data, + ), + AggregatedAttestation( + aggregation_bits=make_aggregation_bits([1, 2]), # unique: 2 + data=att_data, + ), + ] + ) + assert attestations.each_duplicate_attestation_has_unique_participant() is True + + def test_duplicates_with_completely_disjoint_participants(self) -> None: + """Duplicates with completely disjoint participants should return True.""" + att_data = make_attestation_data(slot=1) + attestations = AggregatedAttestations( + data=[ + AggregatedAttestation( + aggregation_bits=make_aggregation_bits([0, 1]), + data=att_data, + ), + AggregatedAttestation( + aggregation_bits=make_aggregation_bits([2, 3]), + data=att_data, + ), + ] + ) + assert attestations.each_duplicate_attestation_has_unique_participant() is True + + def test_duplicates_with_complete_overlap_fails(self) -> None: + """Duplicates with complete overlap should return False.""" + att_data = make_attestation_data(slot=1) + attestations = AggregatedAttestations( + data=[ + AggregatedAttestation( + aggregation_bits=make_aggregation_bits([0, 1, 2]), + data=att_data, + ), + AggregatedAttestation( + aggregation_bits=make_aggregation_bits([0, 1, 2]), + data=att_data, + ), + ] + ) + assert attestations.each_duplicate_attestation_has_unique_participant() is False + + def test_duplicates_where_one_has_no_unique_participant_fails(self) -> None: + """Duplicates where one attestation has no unique participant should return False.""" + att_data = make_attestation_data(slot=1) + attestations = AggregatedAttestations( + data=[ + AggregatedAttestation( + aggregation_bits=make_aggregation_bits([0, 1, 2]), + data=att_data, + ), + AggregatedAttestation( + aggregation_bits=make_aggregation_bits([0, 1]), # no unique participant + data=att_data, + ), + ] + ) + assert attestations.each_duplicate_attestation_has_unique_participant() is False + + def test_three_duplicates_with_partial_overlap_and_unique_participants(self) -> None: + """Three duplicates with partial overlap, each having unique participant.""" + att_data = make_attestation_data(slot=1) + attestations = AggregatedAttestations( + data=[ + AggregatedAttestation( + aggregation_bits=make_aggregation_bits([0, 1, 2]), # unique: 0 + data=att_data, + ), + AggregatedAttestation( + aggregation_bits=make_aggregation_bits([1, 2, 3]), # unique: 3 + data=att_data, + ), + AggregatedAttestation( + aggregation_bits=make_aggregation_bits([2, 4]), # unique: 4 + data=att_data, + ), + ] + ) + assert attestations.each_duplicate_attestation_has_unique_participant() is True + + def test_three_duplicates_where_one_has_no_unique_participant_fails(self) -> None: + """Three duplicates where one has no unique participant should return False.""" + att_data = make_attestation_data(slot=1) + attestations = AggregatedAttestations( + data=[ + AggregatedAttestation( + aggregation_bits=make_aggregation_bits([0, 1, 2]), + data=att_data, + ), + AggregatedAttestation( + aggregation_bits=make_aggregation_bits([1, 2, 3]), + data=att_data, + ), + AggregatedAttestation( + aggregation_bits=make_aggregation_bits([1, 2]), # no unique participant + data=att_data, + ), + ] + ) + assert attestations.each_duplicate_attestation_has_unique_participant() is False + + def test_single_validator_in_each_duplicate(self) -> None: + """Duplicates where each has a single unique validator should return True.""" + att_data = make_attestation_data(slot=1) + attestations = AggregatedAttestations( + data=[ + AggregatedAttestation( + aggregation_bits=make_aggregation_bits([0]), + data=att_data, + ), + AggregatedAttestation( + aggregation_bits=make_aggregation_bits([1]), + data=att_data, + ), + AggregatedAttestation( + aggregation_bits=make_aggregation_bits([2]), + data=att_data, + ), + ] + ) + assert attestations.each_duplicate_attestation_has_unique_participant() is True + + def test_multiple_attestation_data_groups_mixed_validity(self) -> None: + """Multiple attestation data groups where one is valid, one is invalid.""" + att_data1 = make_attestation_data(slot=1) + att_data2 = make_attestation_data(slot=2) + attestations = AggregatedAttestations( + data=[ + # Group 1: valid (each has unique participant) + AggregatedAttestation( + aggregation_bits=make_aggregation_bits([0, 1]), # unique: 0 + data=att_data1, + ), + AggregatedAttestation( + aggregation_bits=make_aggregation_bits([1, 2]), # unique: 2 + data=att_data1, + ), + # Group 2: invalid (second has no unique participant) + AggregatedAttestation( + aggregation_bits=make_aggregation_bits([3, 4, 5]), + data=att_data2, + ), + AggregatedAttestation( + aggregation_bits=make_aggregation_bits([3, 4]), # no unique participant + data=att_data2, + ), + ] + ) + assert attestations.each_duplicate_attestation_has_unique_participant() is False + + def test_complex_overlap_pattern_with_unique_participants(self) -> None: + """Complex overlap pattern where all attestations have unique participants.""" + att_data = make_attestation_data(slot=1) + attestations = AggregatedAttestations( + data=[ + AggregatedAttestation( + aggregation_bits=make_aggregation_bits([0, 1, 2, 3]), # unique: 0 + data=att_data, + ), + AggregatedAttestation( + aggregation_bits=make_aggregation_bits([1, 2, 3, 4]), # unique: 4 + data=att_data, + ), + AggregatedAttestation( + aggregation_bits=make_aggregation_bits([2, 3, 5]), # unique: 5 + data=att_data, + ), + AggregatedAttestation( + aggregation_bits=make_aggregation_bits([3, 6]), # unique: 6 + data=att_data, + ), + ] + ) + assert attestations.each_duplicate_attestation_has_unique_participant() is True + + def test_subset_relationship_where_subset_has_no_unique_fails(self) -> None: + """One attestation is a strict subset of another - subset has no unique participant.""" + att_data = make_attestation_data(slot=1) + attestations = AggregatedAttestations( + data=[ + AggregatedAttestation( + aggregation_bits=make_aggregation_bits([0, 1, 2, 3, 4]), + data=att_data, + ), + AggregatedAttestation( + aggregation_bits=make_aggregation_bits([1, 2, 3]), # strict subset + data=att_data, + ), + ] + ) + assert attestations.each_duplicate_attestation_has_unique_participant() is False diff --git a/tests/lean_spec/subspecs/containers/test_state_aggregation.py b/tests/lean_spec/subspecs/containers/test_state_aggregation.py new file mode 100644 index 00000000..2f43dfa4 --- /dev/null +++ b/tests/lean_spec/subspecs/containers/test_state_aggregation.py @@ -0,0 +1,750 @@ +"""Tests for the State aggregation helpers introduced on the aggregation branch.""" + +from __future__ import annotations + +import pytest + +from lean_spec.subspecs.containers.attestation import ( + AggregatedAttestation, + AggregationBits, + Attestation, + AttestationData, +) +from lean_spec.subspecs.containers.checkpoint import Checkpoint +from lean_spec.subspecs.containers.slot import Slot +from lean_spec.subspecs.containers.state import State +from lean_spec.subspecs.containers.state.types import Validators +from lean_spec.subspecs.containers.validator import Validator +from lean_spec.subspecs.koalabear import Fp +from lean_spec.subspecs.ssz.hash import hash_tree_root +from lean_spec.subspecs.xmss.containers import PublicKey, Signature +from lean_spec.subspecs.xmss.types import ( + HashDigestList, + HashDigestVector, + HashTreeOpening, + Parameter, + Randomness, +) +from lean_spec.types import Bytes32, Bytes52, Uint64 +from lean_spec.types.byte_arrays import LeanAggregatedSignature + +TEST_AGGREGATED_SIGNATURE = LeanAggregatedSignature(data=b"\x00") + + +def make_bytes32(seed: int) -> Bytes32: + """Create a deterministic Bytes32 value for tests.""" + return Bytes32(bytes([seed % 256]) * 32) + + +def make_public_key_bytes(seed: int) -> bytes: + """Encode a deterministic XMSS public key.""" + root = HashDigestVector(data=[Fp(seed + i) for i in range(HashDigestVector.LENGTH)]) + parameter = Parameter(data=[Fp(seed + 100 + i) for i in range(Parameter.LENGTH)]) + public_key = PublicKey(root=root, parameter=parameter) + return public_key.encode_bytes() + + +def make_signature(seed: int) -> Signature: + """Create a minimal but valid XMSS signature container.""" + randomness = Randomness(data=[Fp(seed + 200 + i) for i in range(Randomness.LENGTH)]) + return Signature( + path=HashTreeOpening(siblings=HashDigestList(data=[])), + rho=randomness, + hashes=HashDigestList(data=[]), + ) + + +def make_validators(count: int) -> Validators: + """Build a validator registry with deterministic keys.""" + validators = [ + Validator(pubkey=Bytes52(make_public_key_bytes(i)), index=Uint64(i)) for i in range(count) + ] + return Validators(data=validators) + + +def make_state(num_validators: int) -> State: + """Create a genesis state with the requested number of validators.""" + return State.generate_genesis(Uint64(0), validators=make_validators(num_validators)) + + +def make_checkpoint(root: Bytes32, slot: int) -> Checkpoint: + """Helper to build checkpoints with integer slots.""" + return Checkpoint(root=root, slot=Slot(slot)) + + +def make_attestation_data( + slot: int, + head_root: Bytes32, + target_root: Bytes32, + source: Checkpoint, +) -> AttestationData: + """ + Construct AttestationData with deterministic head/target roots. + + Parameters + ---------- + slot : int + Slot number for the attestation. + head_root : Bytes32 + Root of the head block. + target_root : Bytes32 + Root of the target checkpoint. + source : Checkpoint + Source checkpoint for the attestation. + """ + return AttestationData( + slot=Slot(slot), + head=make_checkpoint(head_root, slot), + target=make_checkpoint(target_root, slot), + source=source, + ) + + +def make_attestation(validator_index: int, data: AttestationData) -> Attestation: + """Create an attestation for the provided validator.""" + return Attestation(validator_id=Uint64(validator_index), data=data) + + +def test_gossip_aggregation_succeeds_with_all_signatures() -> None: + state = make_state(2) + data_root = b"\x11" * 32 + validator_ids = [Uint64(0), Uint64(1)] + gossip_signatures = { + (Uint64(0), data_root): make_signature(0), + (Uint64(1), data_root): make_signature(1), + } + + result = state._aggregate_signatures_from_gossip( + validator_ids, + data_root, + Slot(3), + gossip_signatures, + ) + + assert result == TEST_AGGREGATED_SIGNATURE + + +def test_gossip_aggregation_returns_none_if_any_signature_missing() -> None: + state = make_state(2) + data_root = b"\x22" * 32 + gossip_signatures = {(Uint64(0), data_root): make_signature(0)} + + result = state._aggregate_signatures_from_gossip( + [Uint64(0), Uint64(1)], + data_root, + Slot(2), + gossip_signatures, + ) + + assert result is None + + +def test_block_payload_lookup_requires_matching_entries() -> None: + state = make_state(3) + data_root = b"\x33" * 32 + validator_ids = [Uint64(0), Uint64(1), Uint64(2)] + participant_bits = AggregationBits.from_validator_indices(validator_ids) + payload = LeanAggregatedSignature(data=b"block-payload") + aggregated_payloads = { + (Uint64(0), data_root): [(participant_bits, payload)], + (Uint64(1), data_root): [(participant_bits, payload)], + (Uint64(2), data_root): [(participant_bits, payload)], + } + + result = state._aggregate_signatures_from_block_payload( + validator_ids, + data_root, + aggregated_payloads, + ) + + assert result == payload + + +def test_block_payload_lookup_returns_none_without_complete_matches() -> None: + state = make_state(2) + data_root = b"\x44" * 32 + validator_ids = [Uint64(0), Uint64(1)] + participant_bits = AggregationBits.from_validator_indices([Uint64(0)]) + payload = LeanAggregatedSignature(data=b"partial") + aggregated_payloads = { + (Uint64(0), data_root): [(participant_bits, payload)], + # Missing entries for validator 1 + } + + result = state._aggregate_signatures_from_block_payload( + validator_ids, + data_root, + aggregated_payloads, + ) + + assert result is None + + +def test_split_aggregated_attestations_prefers_existing_payloads() -> None: + state = make_state(4) + source = make_checkpoint(make_bytes32(9), slot=0) + att_data = make_attestation_data(5, make_bytes32(6), make_bytes32(7), source) + aggregated_attestation = AggregatedAttestation( + aggregation_bits=AggregationBits.from_validator_indices([Uint64(i) for i in range(4)]), + data=att_data, + ) + data_root = att_data.data_root_bytes() + + gossip_signatures = { + (Uint64(0), data_root): make_signature(0), + (Uint64(1), data_root): make_signature(1), + } + + block_bits = AggregationBits.from_validator_indices([Uint64(2), Uint64(3)]) + block_signature = LeanAggregatedSignature(data=b"block-23") + aggregated_payloads = { + (Uint64(2), data_root): [(block_bits, block_signature)], + (Uint64(3), data_root): [(block_bits, block_signature)], + } + + split_atts, split_sigs = state.split_aggregated_attestations( + aggregated_attestation, + gossip_signatures, + aggregated_payloads, + ) + + seen_participants = { + tuple(int(v) for v in att.aggregation_bits.to_validator_indices()) for att in split_atts + } + assert seen_participants == {(0, 1), (2, 3)} + assert block_signature in split_sigs + assert TEST_AGGREGATED_SIGNATURE in split_sigs + + +def test_split_aggregated_attestations_errors_when_signatures_missing() -> None: + state = make_state(2) + source = make_checkpoint(make_bytes32(1), slot=0) + att_data = make_attestation_data(2, make_bytes32(3), make_bytes32(4), source) + aggregated_attestation = AggregatedAttestation( + aggregation_bits=AggregationBits.from_validator_indices([Uint64(0), Uint64(1)]), + data=att_data, + ) + + with pytest.raises(AssertionError, match="Cannot aggregate attestations"): + state.split_aggregated_attestations(aggregated_attestation, {}, {}) + + +def test_compute_aggregated_signatures_prefers_full_gossip_payload() -> None: + state = make_state(2) + source = make_checkpoint(make_bytes32(1), slot=0) + att_data = make_attestation_data(3, make_bytes32(5), make_bytes32(6), source) + attestations = [make_attestation(i, att_data) for i in range(2)] + data_root = att_data.data_root_bytes() + gossip_signatures = {(Uint64(i), data_root): make_signature(i) for i in range(2)} + + aggregated_atts, aggregated_sigs = state.compute_aggregated_signatures( + attestations, + gossip_signatures=gossip_signatures, + ) + + assert len(aggregated_atts) == 1 + assert aggregated_sigs == [TEST_AGGREGATED_SIGNATURE] + + +def test_compute_aggregated_signatures_splits_when_needed() -> None: + state = make_state(3) + source = make_checkpoint(make_bytes32(2), slot=0) + att_data = make_attestation_data(4, make_bytes32(7), make_bytes32(8), source) + attestations = [make_attestation(i, att_data) for i in range(3)] + data_root = att_data.data_root_bytes() + gossip_signatures = {(Uint64(0), data_root): make_signature(0)} + + block_bits = AggregationBits.from_validator_indices([Uint64(1), Uint64(2)]) + block_signature = LeanAggregatedSignature(data=b"block-12") + aggregated_payloads = { + (Uint64(1), data_root): [(block_bits, block_signature)], + (Uint64(2), data_root): [(block_bits, block_signature)], + } + + aggregated_atts, aggregated_sigs = state.compute_aggregated_signatures( + attestations, + gossip_signatures=gossip_signatures, + aggregated_payloads=aggregated_payloads, + ) + + seen_participants = [ + tuple(int(v) for v in att.aggregation_bits.to_validator_indices()) + for att in aggregated_atts + ] + assert (0,) in seen_participants + assert (1, 2) in seen_participants + assert block_signature in aggregated_sigs + assert TEST_AGGREGATED_SIGNATURE in aggregated_sigs + + +def test_build_block_collects_valid_available_attestations() -> None: + state = make_state(2) + # Compute parent_root as it will be after process_slots fills in the state_root + parent_header_with_state_root = state.latest_block_header.model_copy( + update={"state_root": hash_tree_root(state)} + ) + parent_root = hash_tree_root(parent_header_with_state_root) + source = make_checkpoint(parent_root, slot=0) + head_root = make_bytes32(10) + # Target checkpoint should reference the justified checkpoint (slot 0), not the attestation slot + target = make_checkpoint(make_bytes32(11), slot=0) + att_data = AttestationData( + slot=Slot(1), + head=make_checkpoint(head_root, slot=1), + target=target, + source=source, + ) + attestation = make_attestation(0, att_data) + data_root = att_data.data_root_bytes() + + gossip_signatures = {(Uint64(0), data_root): make_signature(0)} + + # Proposer for slot 1 with 2 validators: slot % num_validators = 1 % 2 = 1 + block, post_state, aggregated_atts, aggregated_sigs = state.build_block( + slot=Slot(1), + proposer_index=Uint64(1), + parent_root=parent_root, + attestations=[], + available_attestations=[attestation], + known_block_roots={head_root}, + gossip_signatures=gossip_signatures, + aggregated_payloads={}, + ) + + assert post_state.latest_block_header.slot == Slot(1) + assert list(block.body.attestations.data) == aggregated_atts + assert aggregated_sigs == [TEST_AGGREGATED_SIGNATURE] + assert block.body.attestations.data[0].aggregation_bits.to_validator_indices() == [Uint64(0)] + + +def test_build_block_skips_attestations_without_signatures() -> None: + state = make_state(1) + # Compute parent_root as it will be after process_slots fills in the state_root + parent_header_with_state_root = state.latest_block_header.model_copy( + update={"state_root": hash_tree_root(state)} + ) + parent_root = hash_tree_root(parent_header_with_state_root) + source = make_checkpoint(parent_root, slot=0) + head_root = make_bytes32(15) + # Target checkpoint should reference the justified checkpoint (slot 0), not the attestation slot + target = make_checkpoint(make_bytes32(16), slot=0) + att_data = AttestationData( + slot=Slot(1), + head=make_checkpoint(head_root, slot=1), + target=target, + source=source, + ) + attestation = make_attestation(0, att_data) + + # Proposer for slot 1 with 1 validator: slot % num_validators = 1 % 1 = 0 + block, post_state, aggregated_atts, aggregated_sigs = state.build_block( + slot=Slot(1), + proposer_index=Uint64(0), + parent_root=parent_root, + attestations=[], + available_attestations=[attestation], + known_block_roots={head_root}, + gossip_signatures={}, + aggregated_payloads={}, + ) + + assert post_state.latest_block_header.slot == Slot(1) + assert aggregated_atts == [] + assert aggregated_sigs == [] + assert list(block.body.attestations.data) == [] + + +# ============================================================================ +# Additional edge case tests for _aggregate_signatures_from_gossip +# ============================================================================ + + +def test_gossip_aggregation_with_empty_validator_list() -> None: + """Empty validator list should return None.""" + state = make_state(2) + data_root = b"\x99" * 32 + gossip_signatures = {(Uint64(0), data_root): make_signature(0)} + + result = state._aggregate_signatures_from_gossip( + [], # empty validator list + data_root, + Slot(1), + gossip_signatures, + ) + + assert result is None + + +def test_gossip_aggregation_with_none_gossip_signatures() -> None: + """None gossip_signatures should return None.""" + state = make_state(2) + data_root = b"\x88" * 32 + + result = state._aggregate_signatures_from_gossip( + [Uint64(0), Uint64(1)], + data_root, + Slot(1), + None, # None gossip_signatures + ) + + assert result is None + + +def test_gossip_aggregation_with_empty_gossip_signatures() -> None: + """Empty gossip_signatures dict should return None.""" + state = make_state(2) + data_root = b"\x77" * 32 + + result = state._aggregate_signatures_from_gossip( + [Uint64(0), Uint64(1)], + data_root, + Slot(1), + {}, # empty dict + ) + + assert result is None + + +# ============================================================================ +# Additional edge case tests for _aggregate_signatures_from_block_payload +# ============================================================================ + + +def test_block_payload_with_empty_validator_list() -> None: + """Empty validator list should return None.""" + state = make_state(2) + data_root = b"\x66" * 32 + participant_bits = AggregationBits.from_validator_indices([Uint64(0)]) + payload = LeanAggregatedSignature(data=b"payload") + aggregated_payloads = { + (Uint64(0), data_root): [(participant_bits, payload)], + } + + result = state._aggregate_signatures_from_block_payload( + [], # empty validator list + data_root, + aggregated_payloads, + ) + + assert result is None + + +def test_block_payload_with_none_aggregated_payloads() -> None: + """None aggregated_payloads should return None.""" + state = make_state(2) + data_root = b"\x55" * 32 + + result = state._aggregate_signatures_from_block_payload( + [Uint64(0), Uint64(1)], + data_root, + None, # None aggregated_payloads + ) + + assert result is None + + +def test_block_payload_with_empty_aggregated_payloads() -> None: + """Empty aggregated_payloads dict should return None.""" + state = make_state(2) + data_root = b"\x44" * 32 + + result = state._aggregate_signatures_from_block_payload( + [Uint64(0), Uint64(1)], + data_root, + {}, # empty dict + ) + + assert result is None + + +def test_block_payload_with_empty_first_records() -> None: + """First validator having empty records should return None.""" + state = make_state(2) + data_root = b"\x33" * 32 + aggregated_payloads = { + (Uint64(0), data_root): [], # empty records for first validator + (Uint64(1), data_root): [ + ( + AggregationBits.from_validator_indices([Uint64(1)]), + LeanAggregatedSignature(data=b"sig"), + ) + ], + } + + result = state._aggregate_signatures_from_block_payload( + [Uint64(0), Uint64(1)], + data_root, + aggregated_payloads, + ) + + assert result is None + + +def test_block_payload_with_mismatched_signatures() -> None: + """All validators have entries but with different signatures should return None.""" + state = make_state(2) + data_root = b"\x22" * 32 + participant_bits = AggregationBits.from_validator_indices([Uint64(0), Uint64(1)]) + payload1 = LeanAggregatedSignature(data=b"payload1") + payload2 = LeanAggregatedSignature(data=b"payload2") + aggregated_payloads = { + (Uint64(0), data_root): [(participant_bits, payload1)], + (Uint64(1), data_root): [(participant_bits, payload2)], # different signature + } + + result = state._aggregate_signatures_from_block_payload( + [Uint64(0), Uint64(1)], + data_root, + aggregated_payloads, + ) + + assert result is None + + +def test_block_payload_selects_correct_payload_among_multiple() -> None: + """When multiple payloads exist, should select the one matching all validators.""" + state = make_state(3) + data_root = b"\x11" * 32 + + # Partial payload for validators 0 and 1 + partial_bits = AggregationBits.from_validator_indices([Uint64(0), Uint64(1)]) + partial_payload = LeanAggregatedSignature(data=b"partial") + + # Full payload for all three validators + full_bits = AggregationBits.from_validator_indices([Uint64(0), Uint64(1), Uint64(2)]) + full_payload = LeanAggregatedSignature(data=b"full") + + aggregated_payloads = { + (Uint64(0), data_root): [(partial_bits, partial_payload), (full_bits, full_payload)], + (Uint64(1), data_root): [(partial_bits, partial_payload), (full_bits, full_payload)], + (Uint64(2), data_root): [(full_bits, full_payload)], + } + + result = state._aggregate_signatures_from_block_payload( + [Uint64(0), Uint64(1), Uint64(2)], + data_root, + aggregated_payloads, + ) + + assert result == full_payload + + +# ============================================================================ +# Additional edge case tests for split_aggregated_attestations +# ============================================================================ + + +def test_split_with_only_gossip_signatures() -> None: + """Split should work with only gossip signatures (no block payloads).""" + state = make_state(3) + source = make_checkpoint(make_bytes32(10), slot=0) + att_data = make_attestation_data(5, make_bytes32(11), make_bytes32(12), source) + aggregated_attestation = AggregatedAttestation( + aggregation_bits=AggregationBits.from_validator_indices([Uint64(i) for i in range(3)]), + data=att_data, + ) + data_root = att_data.data_root_bytes() + + gossip_signatures = { + (Uint64(0), data_root): make_signature(0), + (Uint64(1), data_root): make_signature(1), + (Uint64(2), data_root): make_signature(2), + } + + split_atts, split_sigs = state.split_aggregated_attestations( + aggregated_attestation, + gossip_signatures, + None, # no block payloads + ) + + # Should create a single aggregated attestation from gossip + assert len(split_atts) == 1 + assert len(split_sigs) == 1 + assert split_atts[0].aggregation_bits.to_validator_indices() == [ + Uint64(0), + Uint64(1), + Uint64(2), + ] + + +def test_split_with_only_block_payloads() -> None: + """Split should work with only block payloads (no gossip signatures).""" + state = make_state(2) + source = make_checkpoint(make_bytes32(13), slot=0) + att_data = make_attestation_data(6, make_bytes32(14), make_bytes32(15), source) + aggregated_attestation = AggregatedAttestation( + aggregation_bits=AggregationBits.from_validator_indices([Uint64(0), Uint64(1)]), + data=att_data, + ) + data_root = att_data.data_root_bytes() + + block_bits = AggregationBits.from_validator_indices([Uint64(0), Uint64(1)]) + block_signature = LeanAggregatedSignature(data=b"block-01") + aggregated_payloads = { + (Uint64(0), data_root): [(block_bits, block_signature)], + (Uint64(1), data_root): [(block_bits, block_signature)], + } + + split_atts, split_sigs = state.split_aggregated_attestations( + aggregated_attestation, + None, # no gossip signatures + aggregated_payloads, + ) + + assert len(split_atts) == 1 + assert len(split_sigs) == 1 + assert split_sigs[0] == block_signature + + +def test_split_with_single_validator() -> None: + """Split with a single validator should work correctly.""" + state = make_state(1) + source = make_checkpoint(make_bytes32(16), slot=0) + att_data = make_attestation_data(7, make_bytes32(17), make_bytes32(18), source) + aggregated_attestation = AggregatedAttestation( + aggregation_bits=AggregationBits.from_validator_indices([Uint64(0)]), + data=att_data, + ) + data_root = att_data.data_root_bytes() + + gossip_signatures = { + (Uint64(0), data_root): make_signature(0), + } + + split_atts, split_sigs = state.split_aggregated_attestations( + aggregated_attestation, + gossip_signatures, + None, + ) + + assert len(split_atts) == 1 + assert len(split_sigs) == 1 + assert split_atts[0].aggregation_bits.to_validator_indices() == [Uint64(0)] + + +def test_split_greedy_selection_prefers_larger_sets() -> None: + """Greedy algorithm should prefer larger validator sets to minimize splits.""" + state = make_state(5) + source = make_checkpoint(make_bytes32(19), slot=0) + att_data = make_attestation_data(8, make_bytes32(20), make_bytes32(21), source) + aggregated_attestation = AggregatedAttestation( + aggregation_bits=AggregationBits.from_validator_indices([Uint64(i) for i in range(5)]), + data=att_data, + ) + data_root = att_data.data_root_bytes() + + # Provide overlapping payloads: small pairs and one large group + bits_01 = AggregationBits.from_validator_indices([Uint64(0), Uint64(1)]) + bits_23 = AggregationBits.from_validator_indices([Uint64(2), Uint64(3)]) + bits_0234 = AggregationBits.from_validator_indices([Uint64(0), Uint64(2), Uint64(3), Uint64(4)]) + + sig_01 = LeanAggregatedSignature(data=b"sig-01") + sig_23 = LeanAggregatedSignature(data=b"sig-23") + sig_0234 = LeanAggregatedSignature(data=b"sig-0234") + + aggregated_payloads = { + (Uint64(0), data_root): [(bits_01, sig_01), (bits_0234, sig_0234)], + (Uint64(1), data_root): [(bits_01, sig_01)], + (Uint64(2), data_root): [(bits_23, sig_23), (bits_0234, sig_0234)], + (Uint64(3), data_root): [(bits_23, sig_23), (bits_0234, sig_0234)], + (Uint64(4), data_root): [(bits_0234, sig_0234)], + } + + split_atts, split_sigs = state.split_aggregated_attestations( + aggregated_attestation, + {}, + aggregated_payloads, + ) + + # Greedy should pick the large group first (0,2,3,4), then fill in validator 1 + # This results in 2 splits instead of 3 if it picked small pairs first + assert len(split_atts) == 2 + participant_sets = [ + {int(v) for v in att.aggregation_bits.to_validator_indices()} for att in split_atts + ] + # The large set should be selected + assert {0, 2, 3, 4} in participant_sets or {0, 1, 2, 3, 4} in participant_sets + + +# ============================================================================ +# Additional edge case tests for compute_aggregated_signatures +# ============================================================================ + + +def test_compute_aggregated_signatures_with_empty_attestations() -> None: + """Empty attestations list should return empty results.""" + state = make_state(2) + + aggregated_atts, aggregated_sigs = state.compute_aggregated_signatures( + [], # empty attestations + gossip_signatures={}, + aggregated_payloads={}, + ) + + assert aggregated_atts == [] + assert aggregated_sigs == [] + + +def test_compute_aggregated_signatures_with_multiple_data_groups() -> None: + """Multiple attestation data groups should be processed independently.""" + state = make_state(4) + source = make_checkpoint(make_bytes32(22), slot=0) + att_data1 = make_attestation_data(9, make_bytes32(23), make_bytes32(24), source) + att_data2 = make_attestation_data(10, make_bytes32(25), make_bytes32(26), source) + + attestations = [ + make_attestation(0, att_data1), + make_attestation(1, att_data1), + make_attestation(2, att_data2), + make_attestation(3, att_data2), + ] + + data_root1 = att_data1.data_root_bytes() + data_root2 = att_data2.data_root_bytes() + + gossip_signatures = { + (Uint64(0), data_root1): make_signature(0), + (Uint64(1), data_root1): make_signature(1), + (Uint64(2), data_root2): make_signature(2), + (Uint64(3), data_root2): make_signature(3), + } + + aggregated_atts, aggregated_sigs = state.compute_aggregated_signatures( + attestations, + gossip_signatures=gossip_signatures, + ) + + # Should have 2 aggregated attestations (one per data group) + assert len(aggregated_atts) == 2 + assert len(aggregated_sigs) == 2 + + +def test_compute_aggregated_signatures_falls_back_to_block_payload() -> None: + """Should fall back to block payload when gossip is incomplete.""" + state = make_state(2) + source = make_checkpoint(make_bytes32(27), slot=0) + att_data = make_attestation_data(11, make_bytes32(28), make_bytes32(29), source) + attestations = [make_attestation(i, att_data) for i in range(2)] + data_root = att_data.data_root_bytes() + + # Only gossip signature for validator 0 (incomplete) + gossip_signatures = {(Uint64(0), data_root): make_signature(0)} + + # Block payload covers both validators + block_bits = AggregationBits.from_validator_indices([Uint64(0), Uint64(1)]) + block_signature = LeanAggregatedSignature(data=b"block-fallback") + aggregated_payloads = { + (Uint64(0), data_root): [(block_bits, block_signature)], + (Uint64(1), data_root): [(block_bits, block_signature)], + } + + aggregated_atts, aggregated_sigs = state.compute_aggregated_signatures( + attestations, + gossip_signatures=gossip_signatures, + aggregated_payloads=aggregated_payloads, + ) + + # Should use block payload since gossip is incomplete + assert len(aggregated_atts) == 1 + assert len(aggregated_sigs) == 1 + assert aggregated_sigs[0] == block_signature