nimbus-eth2/beacon_chain/interop.nim

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import
stew/endians2, stint,
./extras, ./ssz,
spec/[crypto, datatypes, digest, helpers]
func get_eth1data_stub*(deposit_count: uint64, current_epoch: Epoch): Eth1Data =
# https://github.com/ethereum/eth2.0-pm/blob/e596c70a19e22c7def4fd3519e20ae4022349390/interop/mocked_eth1data/README.md
let
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voting_period = current_epoch.uint64 div EPOCHS_PER_ETH1_VOTING_PERIOD
Eth1Data(
deposit_root: hash_tree_root(voting_period),
deposit_count: deposit_count,
block_hash: hash_tree_root(hash_tree_root(voting_period).data),
)
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func makeInteropPrivKey*(i: int): ValidatorPrivKey =
var bytes: array[32, byte]
bytes[0..7] = uint64(i).toBytesLE()
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let
# BLS381-12 curve order - same as milagro but formatted different
curveOrder =
"52435875175126190479447740508185965837690552500527637822603658699938581184513".parse(UInt256)
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privkeyBytes = eth2hash(bytes)
key = (UInt256.fromBytesLE(privkeyBytes.data) mod curveOrder).toBytesBE()
ValidatorPrivKey.fromRaw(key).tryGet()
const eth1BlockHash* = block:
var x: Eth2Digest
for v in x.data.mitems: v = 0x42
x
# https://github.com/ethereum/eth2.0-specs/blob/v0.11.1/specs/phase0/deposit-contract.md#withdrawal-credentials
func makeWithdrawalCredentials*(k: ValidatorPubKey): Eth2Digest =
var bytes = eth2hash(k.toRaw())
bytes.data[0] = BLS_WITHDRAWAL_PREFIX.uint8
bytes
func makeDeposit*(
pubkey: ValidatorPubKey, privkey: ValidatorPrivKey, epoch = 0.Epoch,
amount: Gwei = MAX_EFFECTIVE_BALANCE.Gwei,
flags: UpdateFlags = {}): Deposit =
var
ret = Deposit(
data: DepositData(
amount: amount,
pubkey: pubkey,
withdrawal_credentials: makeWithdrawalCredentials(pubkey)))
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if skipBLSValidation notin flags:
let domain = compute_domain(DOMAIN_DEPOSIT, GENESIS_FORK_VERSION)
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let signing_root = compute_signing_root(ret.getDepositMessage, domain)
ret.data.signature = bls_sign(privkey, signing_root.data)
ret