private DepositData BuildAndSignDepositData(ulong validatorIndex, Gwei amount, SignatureDomains signatureDomains)
{
InitialValues initialValues = _initialValueOptions.CurrentValue;
byte[] privateKey = GeneratePrivateKey(validatorIndex);
// Public Key
BLSParameters blsParameters = new BLSParameters
{
PrivateKey = privateKey
};
using BLS bls = BLS.Create(blsParameters);
byte[] publicKeyBytes = new byte[BlsPublicKey.Length];
bls.TryExportBlsPublicKey(publicKeyBytes, out int publicKeyBytesWritten);
BlsPublicKey publicKey = new BlsPublicKey(publicKeyBytes);
// Withdrawal Credentials
Bytes32 withdrawalCredentials = _crypto.Hash(publicKey.AsSpan());
withdrawalCredentials.Unwrap()[0] = initialValues.BlsWithdrawalPrefix;
// Build deposit data
DepositData depositData = new DepositData(publicKey, withdrawalCredentials, amount, BlsSignature.Zero);
// Sign deposit data
Domain domain = _beaconChainUtility.ComputeDomain(signatureDomains.Deposit);
DepositMessage depositMessage = new DepositMessage(
depositData.PublicKey,
depositData.WithdrawalCredentials,
depositData.Amount);
Root depositMessageRoot = _crypto.HashTreeRoot(depositMessage);
Root depositDataSigningRoot = _beaconChainUtility.ComputeSigningRoot(depositMessageRoot, domain);
byte[] signatureBytes = new byte[96];
bls.TrySignData(depositDataSigningRoot.AsSpan(), signatureBytes, out int bytesWritten);
BlsSignature depositDataSignature = new BlsSignature(signatureBytes);
depositData.SetSignature(depositDataSignature);
if (_logger.IsEnabled(LogLevel.Debug))
{
LogDebug.QuickStartAddValidator(_logger, validatorIndex, publicKey.ToString().Substring(0, 12),
null);
}
return(depositData);
}