109 lines
3.7 KiB
Python
109 lines
3.7 KiB
Python
from eth2spec.test.helpers.keys import pubkeys, privkeys
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from eth2spec.utils.bls import bls_sign
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from eth2spec.utils.merkle_minimal import calc_merkle_tree_from_leaves, get_merkle_proof
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from eth2spec.utils.ssz.ssz_impl import signing_root, hash_tree_root
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from eth2spec.utils.ssz.ssz_typing import List
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def build_deposit_data(spec, pubkey, privkey, amount, withdrawal_credentials, state=None, signed=False):
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deposit_data = spec.DepositData(
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pubkey=pubkey,
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withdrawal_credentials=withdrawal_credentials,
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amount=amount,
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)
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if signed:
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sign_deposit_data(spec, deposit_data, privkey, state)
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return deposit_data
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def sign_deposit_data(spec, deposit_data, privkey, state=None):
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if state is None:
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# Genesis
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domain = spec.compute_domain(spec.DOMAIN_DEPOSIT)
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else:
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domain = spec.get_domain(
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state,
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spec.DOMAIN_DEPOSIT,
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)
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signature = bls_sign(
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message_hash=signing_root(deposit_data),
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privkey=privkey,
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domain=domain,
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)
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deposit_data.signature = signature
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def build_deposit(spec,
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state,
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deposit_data_list,
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pubkey,
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privkey,
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amount,
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withdrawal_credentials,
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signed):
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deposit_data = build_deposit_data(spec, pubkey, privkey, amount, withdrawal_credentials, state=state, signed=signed)
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index = len(deposit_data_list)
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deposit_data_list.append(deposit_data)
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root = hash_tree_root(List[spec.DepositData, 2**spec.DEPOSIT_CONTRACT_TREE_DEPTH](*deposit_data_list))
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tree = calc_merkle_tree_from_leaves(tuple([d.hash_tree_root() for d in deposit_data_list]))
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proof = list(get_merkle_proof(tree, item_index=index, tree_len=32)) + [(index + 1).to_bytes(32, 'little')]
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leaf = deposit_data.hash_tree_root()
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assert spec.is_valid_merkle_branch(leaf, proof, spec.DEPOSIT_CONTRACT_TREE_DEPTH + 1, index, root)
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deposit = spec.Deposit(proof=proof, data=deposit_data)
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return deposit, root, deposit_data_list
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def prepare_genesis_deposits(spec, genesis_validator_count, amount, signed=False):
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deposit_data_list = []
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genesis_deposits = []
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for validator_index in range(genesis_validator_count):
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pubkey = pubkeys[validator_index]
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privkey = privkeys[validator_index]
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# insecurely use pubkey as withdrawal key if no credentials provided
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withdrawal_credentials = spec.BLS_WITHDRAWAL_PREFIX + spec.hash(pubkey)[1:]
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deposit, root, deposit_data_list = build_deposit(
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spec,
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None,
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deposit_data_list,
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pubkey,
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privkey,
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amount,
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withdrawal_credentials,
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signed,
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)
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genesis_deposits.append(deposit)
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return genesis_deposits, root
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def prepare_state_and_deposit(spec, state, validator_index, amount, withdrawal_credentials=None, signed=False):
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"""
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Prepare the state for the deposit, and create a deposit for the given validator, depositing the given amount.
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"""
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deposit_data_list = []
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pubkey = pubkeys[validator_index]
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privkey = privkeys[validator_index]
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# insecurely use pubkey as withdrawal key if no credentials provided
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if withdrawal_credentials is None:
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withdrawal_credentials = spec.BLS_WITHDRAWAL_PREFIX + spec.hash(pubkey)[1:]
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deposit, root, deposit_data_list = build_deposit(
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spec,
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state,
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deposit_data_list,
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pubkey,
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privkey,
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amount,
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withdrawal_credentials,
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signed,
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)
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state.eth1_deposit_index = 0
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state.eth1_data.deposit_root = root
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state.eth1_data.deposit_count = len(deposit_data_list)
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return deposit
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