nimbus-eth2/beacon_chain/spec/signatures.nim

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# beacon_chain
# Copyright (c) 2018-2022 Status Research & Development GmbH
# Licensed and distributed under either of
# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
# at your option. This file may not be copied, modified, or distributed except according to those terms.
2022-07-29 10:53:42 +00:00
when (NimMajor, NimMinor) < (1, 4):
{.push raises: [Defect].}
else:
{.push raises: [].}
## Signature production and verification for spec types - for every type of
## signature, there are 3 functions:
## * `compute_*_signing_root` - reduce message to the data that will be signed
## * `get_*_signature` - sign the signing root with a private key
## * `verify_*_signature` - verify a signature produced by `get_*_signature`
##
## See also `signatures_batch` for batch verification versions of these
## functions.
import
./datatypes/[phase0, altair, bellatrix], ./mev/bellatrix_mev, ./helpers,
./eth2_merkleization
export phase0, altair
template withTrust(sig: SomeSig, body: untyped): bool =
when sig is TrustedSig:
true
else:
body
func getDepositMessage(depositData: DepositData): DepositMessage =
DepositMessage(
pubkey: depositData.pubkey,
amount: depositData.amount,
withdrawal_credentials: depositData.withdrawal_credentials)
func compute_slot_signing_root*(
fork: Fork, genesis_validators_root: Eth2Digest, slot: Slot
): Eth2Digest =
let
epoch = epoch(slot)
domain = get_domain(
fork, DOMAIN_SELECTION_PROOF, epoch, genesis_validators_root)
compute_signing_root(slot, domain)
# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/validator.md#aggregation-selection
func get_slot_signature*(
fork: Fork, genesis_validators_root: Eth2Digest, slot: Slot,
privkey: ValidatorPrivKey): CookedSig =
let signing_root = compute_slot_signing_root(
fork, genesis_validators_root, slot)
blsSign(privkey, signing_root.data)
proc verify_slot_signature*(
fork: Fork, genesis_validators_root: Eth2Digest, slot: Slot,
pubkey: ValidatorPubKey | CookedPubKey, signature: SomeSig): bool =
withTrust(signature):
let signing_root = compute_slot_signing_root(
fork, genesis_validators_root, slot)
blsVerify(pubkey, signing_root.data, signature)
func compute_epoch_signing_root*(
fork: Fork, genesis_validators_root: Eth2Digest, epoch: Epoch
): Eth2Digest =
let domain = get_domain(fork, DOMAIN_RANDAO, epoch, genesis_validators_root)
compute_signing_root(epoch, domain)
# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/validator.md#randao-reveal
func get_epoch_signature*(
fork: Fork, genesis_validators_root: Eth2Digest, epoch: Epoch,
privkey: ValidatorPrivKey): CookedSig =
let signing_root = compute_epoch_signing_root(
fork, genesis_validators_root, epoch)
blsSign(privkey, signing_root.data)
proc verify_epoch_signature*(
fork: Fork, genesis_validators_root: Eth2Digest, epoch: Epoch,
pubkey: ValidatorPubKey | CookedPubKey, signature: SomeSig): bool =
withTrust(signature):
let signing_root = compute_epoch_signing_root(
fork, genesis_validators_root, epoch)
blsVerify(pubkey, signing_root.data, signature)
func compute_block_signing_root*(
fork: Fork, genesis_validators_root: Eth2Digest, slot: Slot,
blck: Eth2Digest | SomeForkyBeaconBlock | BeaconBlockHeader |
# https://github.com/ethereum/builder-specs/blob/v0.1.0/specs/README.md#signing
BlindedBeaconBlock): Eth2Digest =
let
epoch = epoch(slot)
domain = get_domain(
fork, DOMAIN_BEACON_PROPOSER, epoch, genesis_validators_root)
compute_signing_root(blck, domain)
# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/validator.md#signature
func get_block_signature*(
fork: Fork, genesis_validators_root: Eth2Digest, slot: Slot,
root: Eth2Digest, privkey: ValidatorPrivKey): CookedSig =
let signing_root = compute_block_signing_root(
fork, genesis_validators_root, slot, root)
blsSign(privkey, signing_root.data)
proc verify_block_signature*(
fork: Fork, genesis_validators_root: Eth2Digest, slot: Slot,
Store finalized block roots in database (3s startup) (#3320) * Store finalized block roots in database (3s startup) When the chain has finalized a checkpoint, the history from that point onwards becomes linear - this is exploited in `.era` files to allow constant-time by-slot lookups. In the database, we can do the same by storing finalized block roots in a simple sparse table indexed by slot, bringing the two representations closer to each other in terms of conceptual layout and performance. Doing so has a number of interesting effects: * mainnet startup time is improved 3-5x (3s on my laptop) * the _first_ startup might take slightly longer as the new index is being built - ~10s on the same laptop * we no longer rely on the beacon block summaries to load the full dag - this is a lot faster because we no longer have to look up each block by parent root * a collateral benefit is that we no longer need to load the full summaries table into memory - we get the RSS benefits of #3164 without the CPU hit. Other random stuff: * simplify forky block generics * fix withManyWrites multiple evaluation * fix validator key cache not being updated properly in chaindag read-only mode * drop pre-altair summaries from `kvstore` * recreate missing summaries from altair+ blocks as well (in case database has lost some to an involuntary restart) * print database startup timings in chaindag load log * avoid allocating superfluos state at startup * use a recursive sql query to load the summaries of the unfinalized blocks
2022-01-30 16:51:04 +00:00
blck: Eth2Digest | SomeForkyBeaconBlock | BeaconBlockHeader,
pubkey: ValidatorPubKey | CookedPubKey, signature: SomeSig): bool =
withTrust(signature):
let
signing_root = compute_block_signing_root(
fork, genesis_validators_root, slot, blck)
blsVerify(pubkey, signing_root.data, signature)
func compute_aggregate_and_proof_signing_root*(
fork: Fork, genesis_validators_root: Eth2Digest,
aggregate_and_proof: AggregateAndProof): Eth2Digest =
let
epoch = epoch(aggregate_and_proof.aggregate.data.slot)
domain = get_domain(
fork, DOMAIN_AGGREGATE_AND_PROOF, epoch, genesis_validators_root)
compute_signing_root(aggregate_and_proof, domain)
# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/validator.md#broadcast-aggregate
func get_aggregate_and_proof_signature*(fork: Fork, genesis_validators_root: Eth2Digest,
aggregate_and_proof: AggregateAndProof,
privkey: ValidatorPrivKey): CookedSig =
let signing_root = compute_aggregate_and_proof_signing_root(
fork, genesis_validators_root, aggregate_and_proof)
blsSign(privkey, signing_root.data)
proc verify_aggregate_and_proof_signature*(
fork: Fork, genesis_validators_root: Eth2Digest,
aggregate_and_proof: AggregateAndProof,
pubkey: ValidatorPubKey | CookedPubKey, signature: SomeSig): bool =
withTrust(signature):
let signing_root = compute_aggregate_and_proof_signing_root(
fork, genesis_validators_root, aggregate_and_proof)
blsVerify(pubkey, signing_root.data, signature)
func compute_attestation_signing_root*(
fork: Fork, genesis_validators_root: Eth2Digest,
attestation_data: AttestationData): Eth2Digest =
let
epoch = attestation_data.target.epoch
domain = get_domain(
fork, DOMAIN_BEACON_ATTESTER, epoch, genesis_validators_root)
compute_signing_root(attestation_data, domain)
# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/validator.md#aggregate-signature
func get_attestation_signature*(
fork: Fork, genesis_validators_root: Eth2Digest,
attestation_data: AttestationData,
privkey: ValidatorPrivKey): CookedSig =
let signing_root = compute_attestation_signing_root(
fork, genesis_validators_root, attestation_data)
blsSign(privkey, signing_root.data)
proc verify_attestation_signature*(
fork: Fork, genesis_validators_root: Eth2Digest,
attestation_data: AttestationData,
pubkeys: auto, signature: SomeSig): bool =
withTrust(signature):
let signing_root = compute_attestation_signing_root(
fork, genesis_validators_root, attestation_data)
blsFastAggregateVerify(pubkeys, signing_root.data, signature)
func compute_deposit_signing_root*(
version: Version,
deposit_message: DepositMessage): Eth2Digest =
let
# Fork-agnostic domain since deposits are valid across forks
domain = compute_domain(DOMAIN_DEPOSIT, version)
compute_signing_root(deposit_message, domain)
# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/phase0/beacon-chain.md#deposits
Implement split preset/config support (#2710) * Implement split preset/config support This is the initial bulk refactor to introduce runtime config values in a number of places, somewhat replacing the existing mechanism of loading network metadata. It still needs more work, this is the initial refactor that introduces runtime configuration in some of the places that need it. The PR changes the way presets and constants work, to match the spec. In particular, a "preset" now refers to the compile-time configuration while a "cfg" or "RuntimeConfig" is the dynamic part. A single binary can support either mainnet or minimal, but not both. Support for other presets has been removed completely (can be readded, in case there's need). There's a number of outstanding tasks: * `SECONDS_PER_SLOT` still needs fixing * loading custom runtime configs needs redoing * checking constants against YAML file * yeerongpilly support `build/nimbus_beacon_node --network=yeerongpilly --discv5:no --log-level=DEBUG` * load fork epoch from config * fix fork digest sent in status * nicer error string for request failures * fix tools * one more * fixup * fixup * fixup * use "standard" network definition folder in local testnet Files are loaded from their standard locations, including genesis etc, to conform to the format used in the `eth2-networks` repo. * fix launch scripts, allow unknown config values * fix base config of rest test * cleanups * bundle mainnet config using common loader * fix spec links and names * only include supported preset in binary * drop yeerongpilly, add altair-devnet-0, support boot_enr.yaml
2021-07-12 13:01:38 +00:00
func get_deposit_signature*(preset: RuntimeConfig,
deposit: DepositData,
privkey: ValidatorPrivKey): CookedSig =
let signing_root = compute_deposit_signing_root(
preset.GENESIS_FORK_VERSION, deposit.getDepositMessage())
blsSign(privkey, signing_root.data)
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func get_deposit_signature*(message: DepositMessage, version: Version,
privkey: ValidatorPrivKey): CookedSig =
let signing_root = compute_deposit_signing_root(version, message)
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blsSign(privkey, signing_root.data)
Implement split preset/config support (#2710) * Implement split preset/config support This is the initial bulk refactor to introduce runtime config values in a number of places, somewhat replacing the existing mechanism of loading network metadata. It still needs more work, this is the initial refactor that introduces runtime configuration in some of the places that need it. The PR changes the way presets and constants work, to match the spec. In particular, a "preset" now refers to the compile-time configuration while a "cfg" or "RuntimeConfig" is the dynamic part. A single binary can support either mainnet or minimal, but not both. Support for other presets has been removed completely (can be readded, in case there's need). There's a number of outstanding tasks: * `SECONDS_PER_SLOT` still needs fixing * loading custom runtime configs needs redoing * checking constants against YAML file * yeerongpilly support `build/nimbus_beacon_node --network=yeerongpilly --discv5:no --log-level=DEBUG` * load fork epoch from config * fix fork digest sent in status * nicer error string for request failures * fix tools * one more * fixup * fixup * fixup * use "standard" network definition folder in local testnet Files are loaded from their standard locations, including genesis etc, to conform to the format used in the `eth2-networks` repo. * fix launch scripts, allow unknown config values * fix base config of rest test * cleanups * bundle mainnet config using common loader * fix spec links and names * only include supported preset in binary * drop yeerongpilly, add altair-devnet-0, support boot_enr.yaml
2021-07-12 13:01:38 +00:00
proc verify_deposit_signature*(preset: RuntimeConfig,
deposit: DepositData,
pubkey: CookedPubKey): bool =
let
deposit_message = deposit.getDepositMessage()
signing_root = compute_deposit_signing_root(
preset.GENESIS_FORK_VERSION, deposit_message)
blsVerify(pubkey, signing_root.data, deposit.signature)
proc verify_deposit_signature*(preset: RuntimeConfig,
deposit: DepositData): bool =
# Deposits come with compressed public keys; uncompressing them is expensive.
# `blsVerify` fills an internal cache when using `ValidatorPubKey`.
# To avoid filling this cache unnecessarily, uncompress explicitly here.
let pubkey = deposit.pubkey.load() # Loading the pubkey is slow!
if pubkey.isNone:
return false
verify_deposit_signature(preset, deposit, pubkey.get)
func compute_voluntary_exit_signing_root*(
fork: Fork, genesis_validators_root: Eth2Digest,
voluntary_exit: VoluntaryExit): Eth2Digest =
let
epoch = voluntary_exit.epoch
domain = get_domain(
fork, DOMAIN_VOLUNTARY_EXIT, epoch, genesis_validators_root)
compute_signing_root(voluntary_exit, domain)
func get_voluntary_exit_signature*(
fork: Fork, genesis_validators_root: Eth2Digest,
voluntary_exit: VoluntaryExit,
privkey: ValidatorPrivKey): CookedSig =
let signing_root = compute_voluntary_exit_signing_root(
fork, genesis_validators_root, voluntary_exit)
blsSign(privkey, signing_root.data)
proc verify_voluntary_exit_signature*(
fork: Fork, genesis_validators_root: Eth2Digest,
voluntary_exit: VoluntaryExit,
pubkey: ValidatorPubKey | CookedPubKey, signature: SomeSig): bool =
withTrust(signature):
let signing_root = compute_voluntary_exit_signing_root(
fork, genesis_validators_root, voluntary_exit)
blsVerify(pubkey, signing_root.data, signature)
# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/validator.md#prepare-sync-committee-message
func compute_sync_committee_message_signing_root*(
fork: Fork, genesis_validators_root: Eth2Digest,
slot: Slot, beacon_block_root: Eth2Digest): Eth2Digest =
let domain = get_domain(
fork, DOMAIN_SYNC_COMMITTEE, slot.epoch, genesis_validators_root)
compute_signing_root(beacon_block_root, domain)
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func get_sync_committee_message_signature*(
fork: Fork, genesis_validators_root: Eth2Digest,
slot: Slot, beacon_block_root: Eth2Digest,
privkey: ValidatorPrivKey): CookedSig =
let signing_root = compute_sync_committee_message_signing_root(
fork, genesis_validators_root, slot, beacon_block_root)
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blsSign(privkey, signing_root.data)
proc verify_sync_committee_message_signature*(
fork: Fork, genesis_validators_root: Eth2Digest,
slot: Slot, beacon_block_root: Eth2Digest,
pubkey: ValidatorPubKey | CookedPubKey, signature: SomeSig): bool =
let signing_root = compute_sync_committee_message_signing_root(
fork, genesis_validators_root, slot, beacon_block_root)
blsVerify(pubkey, signing_root.data, signature)
proc verify_sync_committee_signature*(
fork: Fork, genesis_validators_root: Eth2Digest,
slot: Slot, beacon_block_root: Eth2Digest,
pubkeys: auto, signature: SomeSig): bool =
let signing_root = compute_sync_committee_message_signing_root(
fork, genesis_validators_root, slot, beacon_block_root)
blsFastAggregateVerify(pubkeys, signing_root.data, signature)
# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/validator.md#aggregation-selection
func compute_sync_committee_selection_proof_signing_root*(
fork: Fork, genesis_validators_root: Eth2Digest,
slot: Slot, subcommittee_index: SyncSubcommitteeIndex): Eth2Digest =
let
domain = get_domain(fork, DOMAIN_SYNC_COMMITTEE_SELECTION_PROOF,
slot.epoch, genesis_validators_root)
signing_data = SyncAggregatorSelectionData(
slot: slot,
subcommittee_index: uint64 subcommittee_index)
compute_signing_root(signing_data, domain)
func get_sync_committee_selection_proof*(
fork: Fork, genesis_validators_root: Eth2Digest,
slot: Slot, subcommittee_index: SyncSubcommitteeIndex,
privkey: ValidatorPrivKey): CookedSig =
let signing_root = compute_sync_committee_selection_proof_signing_root(
fork, genesis_validators_root, slot, subcommittee_index)
blsSign(privkey, signing_root.data)
proc verify_sync_committee_selection_proof*(
fork: Fork, genesis_validators_root: Eth2Digest,
slot: Slot, subcommittee_index: SyncSubcommitteeIndex,
pubkey: ValidatorPubKey | CookedPubKey, signature: SomeSig): bool =
withTrust(signature):
let signing_root = compute_sync_committee_selection_proof_signing_root(
fork, genesis_validators_root, slot, subcommittee_index)
blsVerify(pubkey, signing_root.data, signature)
# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/validator.md#signature
func compute_contribution_and_proof_signing_root*(
fork: Fork, genesis_validators_root: Eth2Digest,
msg: ContributionAndProof): Eth2Digest =
let domain = get_domain(fork, DOMAIN_CONTRIBUTION_AND_PROOF,
msg.contribution.slot.epoch,
genesis_validators_root)
compute_signing_root(msg, domain)
proc get_contribution_and_proof_signature*(
fork: Fork, genesis_validators_root: Eth2Digest,
msg: ContributionAndProof,
privkey: ValidatorPrivKey): CookedSig =
let signing_root = compute_contribution_and_proof_signing_root(
fork, genesis_validators_root, msg)
blsSign(privkey, signing_root.data)
# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/validator.md#aggregation-selection
func is_sync_committee_aggregator*(signature: ValidatorSig): bool =
let
signatureDigest = eth2digest(signature.blob)
modulo = max(1'u64, (SYNC_COMMITTEE_SIZE div SYNC_COMMITTEE_SUBNET_COUNT) div TARGET_AGGREGATORS_PER_SYNC_SUBCOMMITTEE)
bytes_to_uint64(signatureDigest.data.toOpenArray(0, 7)) mod modulo == 0
proc verify_contribution_and_proof_signature*(
fork: Fork, genesis_validators_root: Eth2Digest,
msg: ContributionAndProof,
pubkey: ValidatorPubKey | CookedPubKey, signature: SomeSig): bool =
let signing_root = compute_contribution_and_proof_signing_root(
fork, genesis_validators_root, msg)
blsVerify(pubkey, signing_root.data, signature)
# https://github.com/ethereum/builder-specs/blob/v0.2.0/specs/builder.md#signing
func compute_builder_signing_root*(
fork: Fork, msg: BuilderBid | ValidatorRegistrationV1): Eth2Digest =
# Uses genesis fork version regardless
doAssert fork.current_version == fork.previous_version
let domain = get_domain(
fork, DOMAIN_APPLICATION_BUILDER, GENESIS_EPOCH, ZERO_HASH)
compute_signing_root(msg, domain)
proc get_builder_signature*(
fork: Fork, msg: ValidatorRegistrationV1, privkey: ValidatorPrivKey):
CookedSig =
let signing_root = compute_builder_signing_root(fork, msg)
blsSign(privkey, signing_root.data)
proc verify_builder_signature*(
fork: Fork, msg: BuilderBid,
pubkey: ValidatorPubKey | CookedPubKey, signature: SomeSig): bool =
let signing_root = compute_builder_signing_root(fork, msg)
blsVerify(pubkey, signing_root.data, signature)