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nimbus-eth2/beacon_chain/spec/signatures.nim

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# beacon_chain
# Copyright (c) 2018-2020 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.
{.push raises: [Defect].}
import
../ssz/merkleization,
./crypto, ./digest, ./datatypes, ./helpers, ./presets
template withTrust(sig: SomeSig, body: untyped): bool =
when sig is TrustedSig:
true
else:
body
func compute_slot_root*(
fork: Fork, genesis_validators_root: Eth2Digest, slot: Slot
): Eth2Digest =
let
epoch = compute_epoch_at_slot(slot)
domain = get_domain(
fork, DOMAIN_SELECTION_PROOF, epoch, genesis_validators_root)
result = compute_signing_root(slot, domain)
# https://github.com/ethereum/eth2.0-specs/blob/v1.0.0-rc.0/specs/phase0/validator.md#aggregation-selection
func get_slot_signature*(
fork: Fork, genesis_validators_root: Eth2Digest, slot: Slot,
privkey: ValidatorPrivKey): ValidatorSig =
blsSign(privKey, compute_slot_root(fork, genesis_validators_root, slot).data)
proc verify_slot_signature*(
fork: Fork, genesis_validators_root: Eth2Digest, slot: Slot,
pubkey: ValidatorPubKey, signature: SomeSig): bool =
withTrust(signature):
let
epoch = compute_epoch_at_slot(slot)
domain = get_domain(
fork, DOMAIN_SELECTION_PROOF, epoch, genesis_validators_root)
signing_root = compute_signing_root(slot, domain)
blsVerify(pubkey, signing_root.data, signature)
func compute_epoch_root*(
fork: Fork, genesis_validators_root: Eth2Digest, epoch: Epoch
): Eth2Digest =
let
domain = get_domain(fork, DOMAIN_RANDAO, epoch, genesis_validators_root)
result = compute_signing_root(epoch, domain)
# https://github.com/ethereum/eth2.0-specs/blob/v1.0.0-rc.0/specs/phase0/validator.md#randao-reveal
func get_epoch_signature*(
fork: Fork, genesis_validators_root: Eth2Digest, epoch: Epoch,
privkey: ValidatorPrivKey): ValidatorSig =
blsSign(privKey, compute_epoch_root(fork, genesis_validators_root, epoch).data)
proc verify_epoch_signature*(
fork: Fork, genesis_validators_root: Eth2Digest, epoch: Epoch,
pubkey: ValidatorPubKey, signature: SomeSig): bool =
withTrust(signature):
let
domain = get_domain(fork, DOMAIN_RANDAO, epoch, genesis_validators_root)
signing_root = compute_signing_root(epoch, domain)
blsVerify(pubkey, signing_root.data, signature)
func compute_block_root*(
fork: Fork, genesis_validators_root: Eth2Digest, slot: Slot,
root: Eth2Digest): Eth2Digest =
let
epoch = compute_epoch_at_slot(slot)
domain = get_domain(
fork, DOMAIN_BEACON_PROPOSER, epoch, genesis_validators_root)
result = compute_signing_root(root, domain)
# https://github.com/ethereum/eth2.0-specs/blob/v1.0.0-rc.0/specs/phase0/validator.md#signature
func get_block_signature*(
fork: Fork, genesis_validators_root: Eth2Digest, slot: Slot,
root: Eth2Digest, privkey: ValidatorPrivKey): ValidatorSig =
blsSign(privKey, compute_block_root(fork, genesis_validators_root, slot, root).data)
proc verify_block_signature*(
fork: Fork, genesis_validators_root: Eth2Digest, slot: Slot,
blck: Eth2Digest | SomeBeaconBlock | BeaconBlockHeader,
pubkey: ValidatorPubKey,
signature: SomeSig): bool =
withTrust(signature):
let
epoch = compute_epoch_at_slot(slot)
domain = get_domain(
fork, DOMAIN_BEACON_PROPOSER, epoch, genesis_validators_root)
signing_root = compute_signing_root(blck, domain)
blsVerify(pubKey, signing_root.data, signature)
func compute_aggregate_and_proof_root*(fork: Fork, genesis_validators_root: Eth2Digest,
aggregate_and_proof: AggregateAndProof,
): Eth2Digest =
let
epoch = compute_epoch_at_slot(aggregate_and_proof.aggregate.data.slot)
domain = get_domain(
fork, DOMAIN_AGGREGATE_AND_PROOF, epoch, genesis_validators_root)
result = compute_signing_root(aggregate_and_proof, domain)
# https://github.com/ethereum/eth2.0-specs/blob/v1.0.0-rc.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): ValidatorSig =
blsSign(privKey, compute_aggregate_and_proof_root(fork, genesis_validators_root,
aggregate_and_proof).data)
proc verify_aggregate_and_proof_signature*(fork: Fork, genesis_validators_root: Eth2Digest,
aggregate_and_proof: AggregateAndProof,
pubkey: ValidatorPubKey, signature: SomeSig): bool =
withTrust(signature):
let
epoch = compute_epoch_at_slot(aggregate_and_proof.aggregate.data.slot)
domain = get_domain(
fork, DOMAIN_AGGREGATE_AND_PROOF, epoch, genesis_validators_root)
signing_root = compute_signing_root(aggregate_and_proof, domain)
blsVerify(pubKey, signing_root.data, signature)
func compute_attestation_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)
result = compute_signing_root(attestation_data, domain)
# https://github.com/ethereum/eth2.0-specs/blob/v1.0.0-rc.0/specs/phase0/validator.md#aggregate-signature
func get_attestation_signature*(
fork: Fork, genesis_validators_root: Eth2Digest,
attestation_data: AttestationData,
privkey: ValidatorPrivKey): ValidatorSig =
blsSign(privKey, compute_attestation_root(fork, genesis_validators_root,
attestation_data).data)
proc verify_attestation_signature*(
fork: Fork, genesis_validators_root: Eth2Digest,
attestation_data: AttestationData,
pubkeys: openArray[ValidatorPubKey],
signature: SomeSig): bool =
withTrust(signature):
let
epoch = attestation_data.target.epoch
domain = get_domain(
fork, DOMAIN_BEACON_ATTESTER, epoch, genesis_validators_root)
signing_root = compute_signing_root(attestation_data, domain)
blsFastAggregateVerify(pubkeys, signing_root.data, signature)
# https://github.com/ethereum/eth2.0-specs/blob/v1.0.0-rc.0/specs/phase0/beacon-chain.md#deposits
func get_deposit_signature*(preset: RuntimePreset,
deposit: DepositData,
privkey: ValidatorPrivKey): ValidatorSig =
let
deposit_message = deposit.getDepositMessage()
# Fork-agnostic domain since deposits are valid across forks
domain = compute_domain(DOMAIN_DEPOSIT, preset.GENESIS_FORK_VERSION)
signing_root = compute_signing_root(deposit_message, domain)
blsSign(privKey, signing_root.data)
proc verify_deposit_signature*(preset: RuntimePreset,
deposit: DepositData): bool =
let
deposit_message = deposit.getDepositMessage()
# Fork-agnostic domain since deposits are valid across forks
domain = compute_domain(DOMAIN_DEPOSIT, preset.GENESIS_FORK_VERSION)
signing_root = compute_signing_root(deposit_message, domain)
blsVerify(deposit.pubkey, signing_root.data, deposit.signature)
proc verify_voluntary_exit_signature*(
fork: Fork, genesis_validators_root: Eth2Digest,
voluntary_exit: VoluntaryExit,
pubkey: ValidatorPubKey, signature: SomeSig): bool =
withTrust(signature):
let
domain = get_domain(
fork, DOMAIN_VOLUNTARY_EXIT, voluntary_exit.epoch, genesis_validators_root)
signing_root = compute_signing_root(voluntary_exit, domain)
blsVerify(pubkey, signing_root.data, signature)
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