424 lines
17 KiB
Nim
424 lines
17 KiB
Nim
# beacon_chain
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# Copyright (c) 2018-2024 Status Research & Development GmbH
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# Licensed and distributed under either of
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# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
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# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
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# at your option. This file may not be copied, modified, or distributed except according to those terms.
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{.push raises: [].}
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## Signature production and verification for spec types - for every type of
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## signature, there are 3 functions:
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## * `compute_*_signing_root` - reduce message to the data that will be signed
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## * `get_*_signature` - sign the signing root with a private key
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## * `verify_*_signature` - verify a signature produced by `get_*_signature`
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##
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## See also `signatures_batch` for batch verification versions of these
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## functions.
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import
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./datatypes/[phase0, altair, bellatrix], ./helpers, ./eth2_merkleization
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from ./datatypes/capella import BLSToExecutionChange, SignedBLSToExecutionChange
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export phase0, altair
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template withTrust(sig: SomeSig, body: untyped): bool =
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when sig is TrustedSig:
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true
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else:
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body
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func getDepositMessage(depositData: DepositData): DepositMessage =
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DepositMessage(
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pubkey: depositData.pubkey,
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amount: depositData.amount,
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withdrawal_credentials: depositData.withdrawal_credentials)
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func compute_slot_signing_root*(
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fork: Fork, genesis_validators_root: Eth2Digest, slot: Slot
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): Eth2Digest =
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let
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epoch = epoch(slot)
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domain = get_domain(
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fork, DOMAIN_SELECTION_PROOF, epoch, genesis_validators_root)
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compute_signing_root(slot, domain)
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# https://github.com/ethereum/consensus-specs/blob/v1.4.0/specs/phase0/validator.md#aggregation-selection
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func get_slot_signature*(
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fork: Fork, genesis_validators_root: Eth2Digest, slot: Slot,
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privkey: ValidatorPrivKey): CookedSig =
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let signing_root = compute_slot_signing_root(
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fork, genesis_validators_root, slot)
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blsSign(privkey, signing_root.data)
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func compute_epoch_signing_root*(
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fork: Fork, genesis_validators_root: Eth2Digest, epoch: Epoch
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): Eth2Digest =
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let domain = get_domain(fork, DOMAIN_RANDAO, epoch, genesis_validators_root)
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compute_signing_root(epoch, domain)
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# https://github.com/ethereum/consensus-specs/blob/v1.4.0/specs/phase0/validator.md#randao-reveal
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func get_epoch_signature*(
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fork: Fork, genesis_validators_root: Eth2Digest, epoch: Epoch,
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privkey: ValidatorPrivKey): CookedSig =
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let signing_root = compute_epoch_signing_root(
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fork, genesis_validators_root, epoch)
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blsSign(privkey, signing_root.data)
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proc verify_epoch_signature*(
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fork: Fork, genesis_validators_root: Eth2Digest, epoch: Epoch,
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pubkey: ValidatorPubKey | CookedPubKey, signature: SomeSig): bool =
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withTrust(signature):
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let signing_root = compute_epoch_signing_root(
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fork, genesis_validators_root, epoch)
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blsVerify(pubkey, signing_root.data, signature)
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func compute_block_signing_root*(
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fork: Fork, genesis_validators_root: Eth2Digest, slot: Slot,
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blck: Eth2Digest | SomeForkyBeaconBlock | BeaconBlockHeader): Eth2Digest =
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let
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epoch = epoch(slot)
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domain = get_domain(
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fork, DOMAIN_BEACON_PROPOSER, epoch, genesis_validators_root)
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compute_signing_root(blck, domain)
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# https://github.com/ethereum/consensus-specs/blob/v1.4.0/specs/phase0/validator.md#signature
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func get_block_signature*(
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fork: Fork, genesis_validators_root: Eth2Digest, slot: Slot,
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root: Eth2Digest, privkey: ValidatorPrivKey): CookedSig =
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let signing_root = compute_block_signing_root(
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fork, genesis_validators_root, slot, root)
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blsSign(privkey, signing_root.data)
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proc verify_block_signature*(
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fork: Fork, genesis_validators_root: Eth2Digest, slot: Slot,
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blck: Eth2Digest | SomeForkyBeaconBlock | BeaconBlockHeader,
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pubkey: ValidatorPubKey | CookedPubKey, signature: SomeSig): bool =
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withTrust(signature):
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let
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signing_root = compute_block_signing_root(
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fork, genesis_validators_root, slot, blck)
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blsVerify(pubkey, signing_root.data, signature)
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func compute_aggregate_and_proof_signing_root*(
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fork: Fork, genesis_validators_root: Eth2Digest,
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aggregate_and_proof: phase0.AggregateAndProof): Eth2Digest =
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let
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epoch = epoch(aggregate_and_proof.aggregate.data.slot)
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domain = get_domain(
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fork, DOMAIN_AGGREGATE_AND_PROOF, epoch, genesis_validators_root)
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compute_signing_root(aggregate_and_proof, domain)
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# https://github.com/ethereum/consensus-specs/blob/v1.4.0/specs/phase0/validator.md#broadcast-aggregate
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func get_aggregate_and_proof_signature*(fork: Fork, genesis_validators_root: Eth2Digest,
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aggregate_and_proof: phase0.AggregateAndProof,
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privkey: ValidatorPrivKey): CookedSig =
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let signing_root = compute_aggregate_and_proof_signing_root(
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fork, genesis_validators_root, aggregate_and_proof)
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blsSign(privkey, signing_root.data)
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proc verify_aggregate_and_proof_signature*(
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fork: Fork, genesis_validators_root: Eth2Digest,
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aggregate_and_proof: phase0.AggregateAndProof,
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pubkey: ValidatorPubKey | CookedPubKey, signature: SomeSig): bool =
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withTrust(signature):
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let signing_root = compute_aggregate_and_proof_signing_root(
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fork, genesis_validators_root, aggregate_and_proof)
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blsVerify(pubkey, signing_root.data, signature)
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func compute_attestation_signing_root*(
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fork: Fork, genesis_validators_root: Eth2Digest,
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attestation_data: AttestationData): Eth2Digest =
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let
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epoch = attestation_data.target.epoch
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domain = get_domain(
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fork, DOMAIN_BEACON_ATTESTER, epoch, genesis_validators_root)
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compute_signing_root(attestation_data, domain)
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# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.5/specs/phase0/validator.md#aggregate-signature
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func get_attestation_signature*(
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fork: Fork, genesis_validators_root: Eth2Digest,
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attestation_data: AttestationData,
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privkey: ValidatorPrivKey): CookedSig =
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let signing_root = compute_attestation_signing_root(
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fork, genesis_validators_root, attestation_data)
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blsSign(privkey, signing_root.data)
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proc verify_attestation_signature*(
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fork: Fork, genesis_validators_root: Eth2Digest,
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attestation_data: AttestationData,
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pubkeys: auto, signature: SomeSig): bool =
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withTrust(signature):
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let signing_root = compute_attestation_signing_root(
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fork, genesis_validators_root, attestation_data)
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blsFastAggregateVerify(pubkeys, signing_root.data, signature)
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# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.0/specs/electra/beacon-chain.md#new-is_valid_deposit_signature
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func compute_deposit_signing_root(
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version: Version,
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deposit_message: DepositMessage): Eth2Digest =
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let
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# Fork-agnostic domain since deposits are valid across forks
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domain = compute_domain(DOMAIN_DEPOSIT, version)
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compute_signing_root(deposit_message, domain)
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# https://github.com/ethereum/consensus-specs/blob/v1.4.0/specs/phase0/beacon-chain.md#deposits
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func get_deposit_signature*(preset: RuntimeConfig,
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deposit: DepositData,
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privkey: ValidatorPrivKey): CookedSig =
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let signing_root = compute_deposit_signing_root(
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preset.GENESIS_FORK_VERSION, deposit.getDepositMessage())
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blsSign(privkey, signing_root.data)
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func get_deposit_signature*(message: DepositMessage, version: Version,
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privkey: ValidatorPrivKey): CookedSig =
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let signing_root = compute_deposit_signing_root(version, message)
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blsSign(privkey, signing_root.data)
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proc verify_deposit_signature(preset: RuntimeConfig,
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deposit: DepositData,
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pubkey: CookedPubKey): bool =
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let
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deposit_message = deposit.getDepositMessage()
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signing_root = compute_deposit_signing_root(
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preset.GENESIS_FORK_VERSION, deposit_message)
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blsVerify(pubkey, signing_root.data, deposit.signature)
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proc verify_deposit_signature*(preset: RuntimeConfig,
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deposit: DepositData): bool =
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# Deposits come with compressed public keys; uncompressing them is expensive.
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# `blsVerify` fills an internal cache when using `ValidatorPubKey`.
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# To avoid filling this cache unnecessarily, uncompress explicitly here.
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let pubkey = deposit.pubkey.load().valueOr: # Loading the pubkey is slow!
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return false
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verify_deposit_signature(preset, deposit, pubkey)
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func compute_voluntary_exit_signing_root*(
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fork: Fork, genesis_validators_root: Eth2Digest,
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voluntary_exit: VoluntaryExit): Eth2Digest =
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let
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epoch = voluntary_exit.epoch
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domain = get_domain(
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fork, DOMAIN_VOLUNTARY_EXIT, epoch, genesis_validators_root)
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compute_signing_root(voluntary_exit, domain)
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func voluntary_exit_signature_fork(
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is_post_deneb: static bool,
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state_fork: Fork,
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capella_fork_version: Version): Fork =
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when is_post_deneb:
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# Always use Capella fork version, disregarding `VoluntaryExit` epoch
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# [Modified in Deneb:EIP7044]
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Fork(
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previous_version: capella_fork_version,
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current_version: capella_fork_version,
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epoch: GENESIS_EPOCH) # irrelevant when current/previous identical
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else:
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state_fork
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func voluntary_exit_signature_fork*(
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consensusFork: static ConsensusFork,
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state_fork: Fork,
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capella_fork_version: Version): Fork =
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const is_post_deneb = (consensusFork >= ConsensusFork.Deneb)
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voluntary_exit_signature_fork(is_post_deneb, state_fork, capella_fork_version)
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func voluntary_exit_signature_fork*(
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state_fork: Fork,
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capella_fork_version: Version,
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current_epoch: Epoch,
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deneb_fork_epoch: Epoch): Fork =
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if current_epoch >= deneb_fork_epoch:
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const is_post_deneb = true
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voluntary_exit_signature_fork(
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is_post_deneb, state_fork, capella_fork_version)
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else:
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const is_post_deneb = false
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voluntary_exit_signature_fork(
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is_post_deneb, state_fork, capella_fork_version)
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func get_voluntary_exit_signature*(
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fork: Fork, genesis_validators_root: Eth2Digest,
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voluntary_exit: VoluntaryExit,
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privkey: ValidatorPrivKey): CookedSig =
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let signing_root = compute_voluntary_exit_signing_root(
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fork, genesis_validators_root, voluntary_exit)
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blsSign(privkey, signing_root.data)
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proc verify_voluntary_exit_signature*(
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fork: Fork, genesis_validators_root: Eth2Digest,
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voluntary_exit: VoluntaryExit,
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pubkey: ValidatorPubKey | CookedPubKey, signature: SomeSig): bool =
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withTrust(signature):
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let signing_root = compute_voluntary_exit_signing_root(
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fork, genesis_validators_root, voluntary_exit)
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blsVerify(pubkey, signing_root.data, signature)
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# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.5/specs/altair/validator.md#prepare-sync-committee-message
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func compute_sync_committee_message_signing_root*(
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fork: Fork, genesis_validators_root: Eth2Digest,
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slot: Slot, beacon_block_root: Eth2Digest): Eth2Digest =
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let domain = get_domain(
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fork, DOMAIN_SYNC_COMMITTEE, slot.epoch, genesis_validators_root)
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compute_signing_root(beacon_block_root, domain)
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func get_sync_committee_message_signature*(
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fork: Fork, genesis_validators_root: Eth2Digest,
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slot: Slot, beacon_block_root: Eth2Digest,
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privkey: ValidatorPrivKey): CookedSig =
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let signing_root = compute_sync_committee_message_signing_root(
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fork, genesis_validators_root, slot, beacon_block_root)
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blsSign(privkey, signing_root.data)
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proc verify_sync_committee_message_signature*(
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fork: Fork, genesis_validators_root: Eth2Digest,
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slot: Slot, beacon_block_root: Eth2Digest,
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pubkey: ValidatorPubKey | CookedPubKey, signature: SomeSig): bool =
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let signing_root = compute_sync_committee_message_signing_root(
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fork, genesis_validators_root, slot, beacon_block_root)
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blsVerify(pubkey, signing_root.data, signature)
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proc verify_sync_committee_signature*(
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fork: Fork, genesis_validators_root: Eth2Digest,
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slot: Slot, beacon_block_root: Eth2Digest,
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pubkeys: auto, signature: SomeSig): bool =
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let signing_root = compute_sync_committee_message_signing_root(
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fork, genesis_validators_root, slot, beacon_block_root)
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blsFastAggregateVerify(pubkeys, signing_root.data, signature)
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# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.5/specs/altair/validator.md#aggregation-selection
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func compute_sync_committee_selection_proof_signing_root*(
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fork: Fork, genesis_validators_root: Eth2Digest,
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slot: Slot, subcommittee_index: SyncSubcommitteeIndex): Eth2Digest =
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let
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domain = get_domain(fork, DOMAIN_SYNC_COMMITTEE_SELECTION_PROOF,
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slot.epoch, genesis_validators_root)
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signing_data = SyncAggregatorSelectionData(
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slot: slot,
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subcommittee_index: uint64 subcommittee_index)
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compute_signing_root(signing_data, domain)
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func get_sync_committee_selection_proof*(
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fork: Fork, genesis_validators_root: Eth2Digest,
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slot: Slot, subcommittee_index: SyncSubcommitteeIndex,
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privkey: ValidatorPrivKey): CookedSig =
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let signing_root = compute_sync_committee_selection_proof_signing_root(
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fork, genesis_validators_root, slot, subcommittee_index)
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blsSign(privkey, signing_root.data)
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proc verify_sync_committee_selection_proof*(
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fork: Fork, genesis_validators_root: Eth2Digest,
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slot: Slot, subcommittee_index: SyncSubcommitteeIndex,
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pubkey: ValidatorPubKey | CookedPubKey, signature: SomeSig): bool =
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withTrust(signature):
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let signing_root = compute_sync_committee_selection_proof_signing_root(
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fork, genesis_validators_root, slot, subcommittee_index)
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blsVerify(pubkey, signing_root.data, signature)
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# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.5/specs/altair/validator.md#signature
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func compute_contribution_and_proof_signing_root*(
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fork: Fork, genesis_validators_root: Eth2Digest,
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msg: ContributionAndProof): Eth2Digest =
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let domain = get_domain(fork, DOMAIN_CONTRIBUTION_AND_PROOF,
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msg.contribution.slot.epoch,
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genesis_validators_root)
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compute_signing_root(msg, domain)
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proc get_contribution_and_proof_signature*(
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fork: Fork, genesis_validators_root: Eth2Digest,
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msg: ContributionAndProof,
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privkey: ValidatorPrivKey): CookedSig =
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let signing_root = compute_contribution_and_proof_signing_root(
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fork, genesis_validators_root, msg)
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blsSign(privkey, signing_root.data)
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# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.5/specs/altair/validator.md#aggregation-selection
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func is_sync_committee_aggregator*(signature: ValidatorSig): bool =
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let
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signatureDigest = eth2digest(signature.blob)
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modulo = max(1'u64, (SYNC_COMMITTEE_SIZE div SYNC_COMMITTEE_SUBNET_COUNT) div TARGET_AGGREGATORS_PER_SYNC_SUBCOMMITTEE)
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bytes_to_uint64(signatureDigest.data.toOpenArray(0, 7)) mod modulo == 0
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proc verify_contribution_and_proof_signature*(
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fork: Fork, genesis_validators_root: Eth2Digest,
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msg: ContributionAndProof,
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pubkey: ValidatorPubKey | CookedPubKey, signature: SomeSig): bool =
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let signing_root = compute_contribution_and_proof_signing_root(
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fork, genesis_validators_root, msg)
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blsVerify(pubkey, signing_root.data, signature)
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# https://github.com/ethereum/builder-specs/blob/v0.4.0/specs/bellatrix/builder.md#signing
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func compute_builder_signing_root(
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fork: Fork,
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msg: deneb_mev.BuilderBid | electra_mev.BuilderBid |
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ValidatorRegistrationV1): Eth2Digest =
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# Uses genesis fork version regardless
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doAssert fork.current_version == fork.previous_version
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let domain = get_domain(
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fork, DOMAIN_APPLICATION_BUILDER, GENESIS_EPOCH, ZERO_HASH)
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compute_signing_root(msg, domain)
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proc get_builder_signature*(
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fork: Fork, msg: ValidatorRegistrationV1, privkey: ValidatorPrivKey):
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CookedSig =
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let signing_root = compute_builder_signing_root(fork, msg)
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blsSign(privkey, signing_root.data)
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proc verify_builder_signature*(
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fork: Fork, msg: deneb_mev.BuilderBid | electra_mev.BuilderBid,
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pubkey: ValidatorPubKey | CookedPubKey, signature: SomeSig): bool =
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let signing_root = compute_builder_signing_root(fork, msg)
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blsVerify(pubkey, signing_root.data, signature)
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# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.3/specs/capella/beacon-chain.md#new-process_bls_to_execution_change
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func compute_bls_to_execution_change_signing_root*(
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genesisFork: Fork, genesis_validators_root: Eth2Digest,
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msg: BLSToExecutionChange): Eth2Digest =
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# So the epoch doesn't matter when calling get_domain
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doAssert genesisFork.previous_version == genesisFork.current_version
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# Fork-agnostic domain since address changes are valid across forks
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let domain = get_domain(
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genesisFork, DOMAIN_BLS_TO_EXECUTION_CHANGE, GENESIS_EPOCH,
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genesis_validators_root)
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compute_signing_root(msg, domain)
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proc get_bls_to_execution_change_signature*(
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genesisFork: Fork, genesis_validators_root: Eth2Digest,
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msg: BLSToExecutionChange, privkey: ValidatorPrivKey):
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CookedSig =
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let signing_root = compute_bls_to_execution_change_signing_root(
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genesisFork, genesis_validators_root, msg)
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blsSign(privkey, signing_root.data)
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proc verify_bls_to_execution_change_signature*(
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genesisFork: Fork, genesis_validators_root: Eth2Digest,
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msg: SignedBLSToExecutionChange,
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pubkey: ValidatorPubKey | CookedPubKey, signature: SomeSig): bool =
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let signing_root = compute_bls_to_execution_change_signing_root(
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genesisFork, genesis_validators_root, msg.message)
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blsVerify(pubkey, signing_root.data, signature)
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