# beacon_chain # Copyright (c) 2018-2021 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 ./datatypes/[phase0, altair, merge], ./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_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) compute_signing_root(slot, domain) # https://github.com/ethereum/consensus-specs/blob/v1.1.0/specs/phase0/validator.md#aggregation-selection func get_slot_signature*( fork: Fork, genesis_validators_root: Eth2Digest, slot: Slot, privkey: ValidatorPrivKey): CookedSig = 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 | CookedPubKey, 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) compute_signing_root(epoch, domain) # https://github.com/ethereum/consensus-specs/blob/v1.1.2/specs/phase0/validator.md#randao-reveal func get_epoch_signature*( fork: Fork, genesis_validators_root: Eth2Digest, epoch: Epoch, privkey: ValidatorPrivKey): CookedSig = 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 | CookedPubKey, 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) compute_signing_root(root, domain) # https://github.com/ethereum/consensus-specs/blob/v1.0.1/specs/phase0/validator.md#signature func get_block_signature*( fork: Fork, genesis_validators_root: Eth2Digest, slot: Slot, root: Eth2Digest, privkey: ValidatorPrivKey): CookedSig = 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 | SomeSomeBeaconBlock | BeaconBlockHeader, pubkey: ValidatorPubKey | CookedPubKey, 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) compute_signing_root(aggregate_and_proof, domain) # https://github.com/ethereum/consensus-specs/blob/v1.1.0/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 = 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 | CookedPubKey, 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) compute_signing_root(attestation_data, domain) # https://github.com/ethereum/consensus-specs/blob/v1.1.0-alpha.7/specs/altair/validator.md#prepare-sync-committee-message func sync_committee_msg_signing_root*( fork: Fork, epoch: Epoch, genesis_validators_root: Eth2Digest, block_root: Eth2Digest): Eth2Digest = let domain = get_domain(fork, DOMAIN_SYNC_COMMITTEE, epoch, genesis_validators_root) compute_signing_root(block_root, domain) # https://github.com/ethereum/consensus-specs/blob/v1.1.0-alpha.7/specs/altair/validator.md#signature func 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) # https://github.com/ethereum/consensus-specs/blob/v1.1.0-alpha.7/specs/altair/validator.md#aggregation-selection proc sync_committee_selection_proof_signing_root*( fork: Fork, genesis_validators_root: Eth2Digest, slot: Slot, subcommittee_index: uint64): Eth2Digest = let domain = get_domain(fork, DOMAIN_SYNC_COMMITTEE_SELECTION_PROOF, slot.epoch, genesis_validators_root) signing_data = SyncAggregatorSelectionData( slot: slot, subcommittee_index: subcommittee_index) compute_signing_root(signing_data, domain) # https://github.com/ethereum/consensus-specs/blob/v1.1.0/specs/phase0/validator.md#aggregate-signature func get_attestation_signature*( fork: Fork, genesis_validators_root: Eth2Digest, attestation_data: AttestationData, privkey: ValidatorPrivKey): CookedSig = 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: auto, 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/consensus-specs/blob/v1.1.2/specs/phase0/beacon-chain.md#deposits func get_deposit_signature*(preset: RuntimeConfig, deposit: DepositData, privkey: ValidatorPrivKey): CookedSig = 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: RuntimeConfig, 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) func get_voluntary_exit_signature*( fork: Fork, genesis_validators_root: Eth2Digest, voluntary_exit: VoluntaryExit, privkey: ValidatorPrivKey): CookedSig = let domain = get_domain( fork, DOMAIN_VOLUNTARY_EXIT, voluntary_exit.epoch, genesis_validators_root) signing_root = compute_signing_root(voluntary_exit, domain) blsSign(privKey, signing_root.data) 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) proc verify_sync_committee_message_signature*( epoch: Epoch, beacon_block_root: Eth2Digest, fork: Fork, genesis_validators_root: Eth2Digest, pubkey: CookedPubKey, signature: CookedSig): bool = let domain = get_domain( fork, DOMAIN_SYNC_COMMITTEE, epoch, genesis_validators_root) signing_root = compute_signing_root(beacon_block_root, domain) blsVerify(pubkey, signing_root.data, signature) # https://github.com/ethereum/consensus-specs/blob/v1.1.2/specs/altair/validator.md#aggregation-selection proc 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_signed_contribution_and_proof_signature*( msg: SignedContributionAndProof, fork: Fork, genesis_validators_root: Eth2Digest, pubkey: ValidatorPubKey | CookedPubKey): bool = let domain = get_domain( fork, DOMAIN_CONTRIBUTION_AND_PROOF, msg.message.contribution.slot.epoch, genesis_validators_root) signing_root = compute_signing_root(msg.message, domain) blsVerify(pubkey, signing_root.data, msg.signature) proc verify_selection_proof_signature*( msg: ContributionAndProof, fork: Fork, genesis_validators_root: Eth2Digest, pubkey: ValidatorPubKey | CookedPubKey): bool = let slot = msg.contribution.slot domain = get_domain( fork, DOMAIN_SYNC_COMMITTEE_SELECTION_PROOF, slot.epoch, genesis_validators_root) signing_data = SyncAggregatorSelectionData( slot: slot, subcommittee_index: msg.contribution.subcommittee_index) signing_root = compute_signing_root(signing_data, domain) blsVerify(pubkey, signing_root.data, msg.selection_proof)