455 lines
18 KiB
Nim
455 lines
18 KiB
Nim
# beacon_chain
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# Copyright (c) 2018-2022 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: [Defect].}
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import
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std/[options, tables, json, streams, sequtils, uri],
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chronos, chronicles, metrics,
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json_serialization/std/net,
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presto, presto/client,
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../spec/[keystore, signatures, helpers, crypto],
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../spec/datatypes/[phase0, altair],
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../spec/eth2_apis/[rest_types, eth2_rest_serialization,
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rest_remote_signer_calls],
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./slashing_protection
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export
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streams, options, keystore, phase0, altair, tables, uri, crypto,
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rest_types, eth2_rest_serialization, rest_remote_signer_calls,
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slashing_protection
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declareGauge validators,
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"Number of validators attached to the beacon node"
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type
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ValidatorKind* {.pure.} = enum
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Local, Remote
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ValidatorConnection* = RestClientRef
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AttachedValidator* = ref object
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pubkey*: ValidatorPubKey
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data*: KeystoreData
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case kind*: ValidatorKind
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of ValidatorKind.Local:
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discard
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of ValidatorKind.Remote:
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clients*: seq[(RestClientRef, RemoteSignerInfo)]
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threshold*: uint32
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# The index at which this validator has been observed in the chain -
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# it does not change as long as there are no reorgs on eth1 - however, the
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# index might not be valid in all eth2 histories, so it should not be
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# assumed that a valid index is stored here!
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index*: Option[ValidatorIndex]
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# Cache the latest slot signature - the slot signature is used to determine
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# if the validator will be aggregating (in the near future)
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slotSignature*: Option[tuple[slot: Slot, signature: ValidatorSig]]
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SignResponse* = Web3SignerDataResponse
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SignatureResult* = Result[ValidatorSig, string]
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AttestationResult* = Result[Attestation, string]
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SyncCommitteeMessageResult* = Result[SyncCommitteeMessage, string]
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ValidatorPool* = object
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validators*: Table[ValidatorPubKey, AttachedValidator]
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slashingProtection*: SlashingProtectionDB
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func shortLog*(v: AttachedValidator): string =
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case v.kind
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of ValidatorKind.Local:
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shortLog(v.pubkey)
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of ValidatorKind.Remote:
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shortLog(v.pubkey)
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func init*(T: type ValidatorPool,
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slashingProtectionDB: SlashingProtectionDB): T =
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## Initialize the validator pool and the slashing protection service
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## `genesis_validators_root` is used as an unique ID for the
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## blockchain
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## `backend` is the KeyValue Store backend
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T(slashingProtection: slashingProtectionDB)
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template count*(pool: ValidatorPool): int =
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len(pool.validators)
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proc addLocalValidator*(pool: var ValidatorPool, item: KeystoreData,
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index: Option[ValidatorIndex]) =
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doAssert item.kind == KeystoreKind.Local
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let pubkey = item.pubkey
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let v = AttachedValidator(kind: ValidatorKind.Local, pubkey: pubkey,
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index: index, data: item)
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pool.validators[pubkey] = v
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notice "Local validator attached", pubkey, validator = shortLog(v)
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validators.set(pool.count().int64)
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proc addLocalValidator*(pool: var ValidatorPool, item: KeystoreData) =
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addLocalValidator(pool, item, none[ValidatorIndex]())
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proc addRemoteValidator*(pool: var ValidatorPool, item: KeystoreData,
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clients: seq[(RestClientRef, RemoteSignerInfo)], index: Option[ValidatorIndex]) =
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doAssert item.kind == KeystoreKind.Remote
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let pubkey = item.pubkey
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let v = AttachedValidator(kind: ValidatorKind.Remote, pubkey: pubkey,
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index: index, data: item, clients: clients)
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pool.validators[pubkey] = v
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notice "Remote validator attached", pubkey, validator = shortLog(v),
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remote_signer = $item.remotes
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validators.set(pool.count().int64)
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proc getValidator*(pool: ValidatorPool,
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validatorKey: ValidatorPubKey): AttachedValidator =
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pool.validators.getOrDefault(validatorKey)
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proc contains*(pool: ValidatorPool, pubkey: ValidatorPubKey): bool =
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## Returns ``true`` if validator with key ``pubkey`` present in ``pool``.
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pool.validators.contains(pubkey)
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proc removeValidator*(pool: var ValidatorPool, pubkey: ValidatorPubKey) =
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## Delete validator with public key ``pubkey`` from ``pool``.
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let validator = pool.validators.getOrDefault(pubkey)
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if not(isNil(validator)):
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pool.validators.del(pubkey)
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case validator.kind
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of ValidatorKind.Local:
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notice "Local validator detached", pubkey, validator = shortLog(validator)
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of ValidatorKind.Remote:
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notice "Remote validator detached", pubkey,
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validator = shortLog(validator)
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validators.set(pool.count().int64)
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proc updateValidator*(pool: var ValidatorPool, pubkey: ValidatorPubKey,
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index: ValidatorIndex) =
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## Set validator ``index`` to validator with public key ``pubkey`` stored
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## in ``pool``.
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## This procedure will not raise if validator with public key ``pubkey`` is
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## not present in the pool.
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var v: AttachedValidator
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if pool.validators.pop(pubkey, v):
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v.index = some(index)
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pool.validators[pubkey] = v
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iterator publicKeys*(pool: ValidatorPool): ValidatorPubKey =
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for item in pool.validators.keys():
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yield item
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iterator indices*(pool: ValidatorPool): ValidatorIndex =
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for item in pool.validators.values():
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if item.index.isSome():
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yield item.index.get()
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iterator items*(pool: ValidatorPool): AttachedValidator =
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for item in pool.validators.values():
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yield item
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proc signWithDistributedKey(v: AttachedValidator,
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request: Web3SignerRequest): Future[SignatureResult]
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{.async.} =
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doAssert v.data.threshold <= uint32(v.clients.len)
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let signatureReqs = mapIt(v.clients, it[0].signData(it[1].pubkey, request))
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await allFutures(signatureReqs)
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var shares: seq[SignatureShare]
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var neededShares = v.data.threshold
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for i, req in signatureReqs:
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template shareInfo: untyped = v.clients[i][1]
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if req.done and req.read.isOk:
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shares.add req.read.get.toSignatureShare(shareInfo.id)
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neededShares = neededShares - 1
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else:
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warn "Failed to obtain signature from remote signer",
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pubkey = shareInfo.pubkey,
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signerUrl = $(v.clients[i][0].address)
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if neededShares == 0:
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let recovered = shares.recoverSignature()
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return SignatureResult.ok recovered.toValidatorSig
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return SignatureResult.err "Not enough shares to recover the signature"
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proc signWithSingleKey(v: AttachedValidator,
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request: Web3SignerRequest): Future[SignatureResult]
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{.async.} =
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doAssert v.clients.len == 1
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let (client, info) = v.clients[0]
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let res = await client.signData(info.pubkey, request)
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if res.isErr:
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return SignatureResult.err res.error
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else:
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return SignatureResult.ok res.get.toValidatorSig
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proc signData(v: AttachedValidator,
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request: Web3SignerRequest): Future[SignatureResult]
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{.async.} =
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return
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case v.kind
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of ValidatorKind.Local:
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SignatureResult.err "Invalid validator kind"
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of ValidatorKind.Remote:
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if v.clients.len == 1:
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await v.signWithSingleKey(request)
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else:
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await v.signWithDistributedKey(request)
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proc signWithRemoteValidator*(v: AttachedValidator, fork: Fork,
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genesis_validators_root: Eth2Digest,
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blck: ForkedBeaconBlock): Future[SignatureResult]
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{.async.} =
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let request = Web3SignerRequest.init(fork, genesis_validators_root, blck.Web3SignerForkedBeaconBlock)
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debug "Signing block proposal using remote signer",
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validator = shortLog(v)
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return await v.signData(request)
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proc signWithRemoteValidator*(v: AttachedValidator, fork: Fork,
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genesis_validators_root: Eth2Digest,
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adata: AttestationData): Future[SignatureResult]
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{.async.} =
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let request = Web3SignerRequest.init(fork, genesis_validators_root, adata)
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debug "Signing block proposal using remote signer",
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validator = shortLog(v)
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return await v.signData(request)
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proc signWithRemoteValidator*(v: AttachedValidator, fork: Fork,
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genesis_validators_root: Eth2Digest,
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epoch: Epoch): Future[SignatureResult]
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{.async.} =
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let request = Web3SignerRequest.init(fork, genesis_validators_root, epoch)
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debug "Generating randao reveal signature using remote signer",
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validator = shortLog(v)
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return await v.signData(request)
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proc signWithRemoteValidator*(v: AttachedValidator, fork: Fork,
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genesis_validators_root: Eth2Digest,
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proof: AggregateAndProof): Future[SignatureResult]
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{.async.} =
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let request = Web3SignerRequest.init(fork, genesis_validators_root, proof)
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debug "Signing aggregate and proof using remote signer",
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validator = shortLog(v)
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return await v.signData(request)
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proc signWithRemoteValidator*(v: AttachedValidator, fork: Fork,
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genesis_validators_root: Eth2Digest,
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slot: Slot): Future[SignatureResult]
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{.async.} =
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let request = Web3SignerRequest.init(fork, genesis_validators_root, slot)
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debug "Signing aggregate slot using remote signer",
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validator = shortLog(v)
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return await v.signData(request)
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proc signWithRemoteValidator*(v: AttachedValidator, fork: Fork,
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genesis_validators_root: Eth2Digest,
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slot: Slot,
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blockRoot: Eth2Digest): Future[SignatureResult]
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{.async.} =
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let request = Web3SignerRequest.init(fork, genesis_validators_root, blockRoot,
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slot)
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debug "Signing sync committee message using remote signer",
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validator = shortLog(v)
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return await v.signData(request)
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proc signWithRemoteValidator*(v: AttachedValidator, fork: Fork,
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genesis_validators_root: Eth2Digest,
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slot: Slot,
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subcommittee: SyncSubcommitteeIndex): Future[SignatureResult]
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{.async.} =
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let request = Web3SignerRequest.init(
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fork, genesis_validators_root,
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SyncAggregatorSelectionData(slot: slot, subcommittee_index: uint64 subcommittee)
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)
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debug "Signing sync aggregator selection data using remote signer",
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validator = shortLog(v)
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return await v.signData(request)
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proc signWithRemoteValidator*(v: AttachedValidator, fork: Fork,
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genesis_validators_root: Eth2Digest,
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contribution: ContributionAndProof
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): Future[SignatureResult] {.async.} =
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let request = Web3SignerRequest.init(
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fork, genesis_validators_root, contribution
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)
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debug "Signing sync contribution and proof message using remote signer",
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validator = shortLog(v)
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return await v.signData(request)
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# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/validator.md#signature
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proc signBlockProposal*(v: AttachedValidator, fork: Fork,
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genesis_validators_root: Eth2Digest, slot: Slot,
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blockRoot: Eth2Digest, blck: ForkedBeaconBlock
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): Future[SignatureResult] {.async.} =
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return
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case v.kind
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of ValidatorKind.Local:
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SignatureResult.ok(
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get_block_signature(fork, genesis_validators_root, slot, blockRoot,
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v.data.privateKey).toValidatorSig()
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)
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of ValidatorKind.Remote:
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await signWithRemoteValidator(v, fork, genesis_validators_root,
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blck)
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proc signAttestation*(v: AttachedValidator,
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data: AttestationData,
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fork: Fork, genesis_validators_root: Eth2Digest
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): Future[SignatureResult] {.async.} =
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return
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case v.kind
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of ValidatorKind.Local:
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SignatureResult.ok(
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get_attestation_signature(fork, genesis_validators_root, data,
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v.data.privateKey).toValidatorSig()
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)
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of ValidatorKind.Remote:
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await signWithRemoteValidator(v, fork, genesis_validators_root, data)
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proc produceAndSignAttestation*(validator: AttachedValidator,
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attestationData: AttestationData,
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committeeLen: int, indexInCommittee: Natural,
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fork: Fork,
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genesis_validators_root: Eth2Digest):
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Future[AttestationResult] {.async.} =
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let validatorSignature =
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block:
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let res = await validator.signAttestation(attestationData, fork,
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genesis_validators_root)
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if res.isErr():
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return AttestationResult.err(res.error())
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res.get()
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var aggregationBits = CommitteeValidatorsBits.init(committeeLen)
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aggregationBits.setBit indexInCommittee
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return AttestationResult.ok(
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Attestation(data: attestationData, signature: validatorSignature,
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aggregation_bits: aggregationBits)
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)
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proc signAggregateAndProof*(v: AttachedValidator,
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aggregate_and_proof: AggregateAndProof,
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fork: Fork, genesis_validators_root: Eth2Digest):
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Future[SignatureResult] {.async.} =
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return
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case v.kind
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of ValidatorKind.Local:
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SignatureResult.ok(
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get_aggregate_and_proof_signature(fork, genesis_validators_root,
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aggregate_and_proof,
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v.data.privateKey).toValidatorSig()
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)
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of ValidatorKind.Remote:
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await signWithRemoteValidator(v, fork, genesis_validators_root,
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aggregate_and_proof)
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# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/altair/validator.md#prepare-sync-committee-message
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proc signSyncCommitteeMessage*(v: AttachedValidator,
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fork: Fork,
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genesis_validators_root: Eth2Digest,
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slot: Slot,
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beacon_block_root: Eth2Digest
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): Future[SyncCommitteeMessageResult] {.async.} =
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let signature =
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case v.kind
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of ValidatorKind.Local:
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SignatureResult.ok(get_sync_committee_message_signature(
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fork, genesis_validators_root, slot, beacon_block_root,
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v.data.privateKey).toValidatorSig())
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of ValidatorKind.Remote:
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await signWithRemoteValidator(v, fork, genesis_validators_root,
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slot, beacon_block_root)
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if signature.isErr:
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return SyncCommitteeMessageResult.err("Failed to obtain signature")
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return
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SyncCommitteeMessageResult.ok(
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SyncCommitteeMessage(
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slot: slot,
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beacon_block_root: beacon_block_root,
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validator_index: uint64(v.index.get()),
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signature: signature.get()
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)
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)
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# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/altair/validator.md#aggregation-selection
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proc getSyncCommitteeSelectionProof*(v: AttachedValidator,
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fork: Fork,
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genesis_validators_root: Eth2Digest,
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slot: Slot,
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subcommittee_index: SyncSubcommitteeIndex
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): Future[SignatureResult] {.async.} =
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return
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case v.kind
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of ValidatorKind.Local:
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SignatureResult.ok(get_sync_committee_selection_proof(
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fork, genesis_validators_root, slot, subcommittee_index,
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v.data.privateKey).toValidatorSig())
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of ValidatorKind.Remote:
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await signWithRemoteValidator(v, fork, genesis_validators_root,
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slot, subcommittee_index)
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# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/altair/validator.md#signature
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proc sign*(v: AttachedValidator, msg: ref SignedContributionAndProof,
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fork: Fork, genesis_validators_root: Eth2Digest
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): Future[SignatureResult] {.async.} =
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let signature =
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case v.kind
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of ValidatorKind.Local:
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SignatureResult.ok(get_contribution_and_proof_signature(
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fork, genesis_validators_root, msg.message, v.data.privateKey).toValidatorSig())
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of ValidatorKind.Remote:
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await signWithRemoteValidator(v, fork, genesis_validators_root,
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msg.message)
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if signature.isOk:
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msg.signature = signature.get()
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return signature
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# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/validator.md#randao-reveal
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func genRandaoReveal*(k: ValidatorPrivKey, fork: Fork,
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genesis_validators_root: Eth2Digest,
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slot: Slot): CookedSig =
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get_epoch_signature(fork, genesis_validators_root, slot.epoch, k)
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proc genRandaoReveal*(v: AttachedValidator, fork: Fork,
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genesis_validators_root: Eth2Digest, slot: Slot):
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Future[SignatureResult] {.async.} =
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return
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case v.kind
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of ValidatorKind.Local:
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SignatureResult.ok(genRandaoReveal(v.data.privateKey, fork,
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genesis_validators_root,
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slot).toValidatorSig())
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of ValidatorKind.Remote:
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await signWithRemoteValidator(v, fork, genesis_validators_root,
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slot.epoch())
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proc getSlotSig*(v: AttachedValidator, fork: Fork,
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genesis_validators_root: Eth2Digest, slot: Slot
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): Future[SignatureResult] {.async.} =
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if v.slotSignature.isSome and v.slotSignature.get.slot == slot:
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return SignatureResult.ok(v.slotSignature.get.signature)
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let signature =
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case v.kind
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of ValidatorKind.Local:
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SignatureResult.ok(get_slot_signature(fork, genesis_validators_root, slot,
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v.data.privateKey).toValidatorSig())
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of ValidatorKind.Remote:
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await signWithRemoteValidator(v, fork, genesis_validators_root, slot)
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if signature.isErr:
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return signature
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v.slotSignature = some((slot, signature.get))
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return signature
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