nimbus-eth2/beacon_chain/validator_keygen.nim

import
  os, ospaths, strutils, strformat,
  chronos, nimcrypto, json_serialization, confutils,
  spec/[datatypes, digest, crypto], conf, time, ssz,
  ../tests/testutil

proc writeFile(filename: string, value: auto) =
  Json.saveFile(filename, value, pretty = true)
  echo "Wrote ", filename

cli do (validators: int = 100000,
        outputDir: string = "validators"):

  for i in 0 ..< validators:
    # there can apparently be tops 4M validators so we use 7 digits..
    let
      depositFn = outputDir / &"v{i:07}.deposit.json"
      privKeyFn = outputDir / &"v{i:07}.privkey.json"

    if existsFile(depositFn) and existsFile(privKeyFn):
      continue

    let
      privKey = makeFakeValidatorPrivKey(i)
      pubKey = privKey.pubKey()

    let
      withdrawalCredentials = makeFakeHash(i)

      proofOfPossessionData = DepositInput(
        pubkey: pubKey,
        withdrawal_credentials: withdrawalCredentials)

      proofOfPossession = bls_sign(
        privkey, hash_tree_root_final(proofOfPossessionData).data,
        0 # TODO - domain
        )

    let
      deposit = Deposit(
        deposit_data: DepositData(
          amount: MAX_DEPOSIT_AMOUNT,
          timestamp: now(),
          deposit_input: DepositInput(
            pubkey: pubKey,
            proof_of_possession: proofOfPossession,
            withdrawal_credentials: withdrawalCredentials)))

    writeFile(privKeyFn, privKey)
    writeFile(depositFn, deposit)

  echo "Keys generated by this tool are only for testing!"