public BlsPublicKey BlsAggregatePublicKeys(IEnumerable<BlsPublicKey> publicKeys)
{
// TKS: added an extension here as an example to discuss - I have been avoiding passing IEnumerable
// for the performance reasons - to avoid multiple runs
// and opted for passing either arrays or lists and keep it consistent
// it sometimes / very rarely has an issue of having to cast list to an array
// but usually we have a full control over the flow so it ends up being much better
// what do you think?
// TODO: [SG] yes. Change IEnumerable to IList in most places to avoid double-enumeration.
Span<byte> publicKeysSpan = new Span<byte>(new byte[publicKeys.Count() * BlsPublicKey.Length]);
int publicKeysSpanIndex = 0;
foreach (BlsPublicKey publicKey in publicKeys)
{
publicKey.AsSpan().CopyTo(publicKeysSpan.Slice(publicKeysSpanIndex));
publicKeysSpanIndex += BlsPublicKey.Length;
}
using BLS signatureAlgorithm = SignatureAlgorithmFactory(new BLSParameters());
byte[] aggregatePublicKey = new byte[BlsPublicKey.Length];
bool success = signatureAlgorithm.TryAggregatePublicKeys(publicKeysSpan, aggregatePublicKey, out int bytesWritten);
if (!success || bytesWritten != BlsPublicKey.Length)
{
throw new Exception("Error generating aggregate public key.");
}
return new BlsPublicKey(aggregatePublicKey);
}
public IList <BlsPublicKey> GetPublicKeys()
{
if (_publicKeyToBls.Count == 0)
{
QuickStartParameters _quickStartParameters = _quickStartParameterOptions.CurrentValue;
ulong endIndex = _quickStartParameters.ValidatorStartIndex + _quickStartParameters.NumberOfValidators;
for (ulong validatorIndex = _quickStartParameters.ValidatorStartIndex;
validatorIndex < endIndex;
validatorIndex++)
{
byte[] privateKey = GeneratePrivateKey(validatorIndex);
BLSParameters blsParameters = new BLSParameters()
{
PrivateKey = privateKey
};
BLS bls = BLS.Create(blsParameters);
byte[] publicKeyBytes = new byte[BlsPublicKey.Length];
bls.TryExportBlsPublicKey(publicKeyBytes, out int publicKeyBytesWritten);
BlsPublicKey publicKey = new BlsPublicKey(publicKeyBytes);
// Cache the BLS class, for easy signing
_publicKeyToBls[publicKey] = bls;
}
}
return(_publicKeyToBls.Keys.ToList());
}
public bool BlsVerifyMultiple(IEnumerable <BlsPublicKey> publicKeys, IEnumerable <Hash32> messageHashes, BlsSignature signature, Domain domain)
{
int count = publicKeys.Count();
Span <byte> publicKeysSpan = new Span <byte>(new byte[count * BlsPublicKey.Length]);
int publicKeysSpanIndex = 0;
foreach (BlsPublicKey publicKey in publicKeys)
{
publicKey.AsSpan().CopyTo(publicKeysSpan.Slice(publicKeysSpanIndex));
publicKeysSpanIndex += BlsPublicKey.Length;
}
Span <byte> messageHashesSpan = new Span <byte>(new byte[count * Hash32.Length]);
int messageHashesSpanIndex = 0;
foreach (Hash32 messageHash in messageHashes)
{
messageHash.AsSpan().CopyTo(messageHashesSpan.Slice(messageHashesSpanIndex));
messageHashesSpanIndex += Hash32.Length;
}
using BLS signatureAlgorithm = SignatureAlgorithmFactory(new BLSParameters());
return(signatureAlgorithm.VerifyAggregate(publicKeysSpan, messageHashesSpan, signature.AsSpan(), domain.AsSpan()));
}
public bool BlsAggregateVerify(IList <BlsPublicKey> publicKeys, IList <Root> signingRoots, BlsSignature signature)
{
int count = publicKeys.Count();
Span <byte> publicKeysSpan = new Span <byte>(new byte[count * BlsPublicKey.Length]);
int publicKeysSpanIndex = 0;
foreach (BlsPublicKey publicKey in publicKeys)
{
publicKey.AsSpan().CopyTo(publicKeysSpan.Slice(publicKeysSpanIndex));
publicKeysSpanIndex += BlsPublicKey.Length;
}
Span <byte> signingRootsSpan = new Span <byte>(new byte[count * Root.Length]);
int signingRootsSpanIndex = 0;
foreach (Root signingRoot in signingRoots)
{
signingRoot.AsSpan().CopyTo(signingRootsSpan.Slice(signingRootsSpanIndex));
signingRootsSpanIndex += Root.Length;
}
using BLS signatureAlgorithm = SignatureAlgorithmFactory(new BLSParameters());
return(signatureAlgorithm.AggregateVerifyHashes(publicKeysSpan, signingRootsSpan, signature.AsSpan()));
}
public bool BlsVerify(BlsPublicKey publicKey, Root signingRoot, BlsSignature signature)
{
BLSParameters blsParameters = new BLSParameters()
{
PublicKey = publicKey.AsSpan().ToArray()
};
using BLS signatureAlgorithm = SignatureAlgorithmFactory(blsParameters);
return(signatureAlgorithm.VerifyHash(signingRoot.AsSpan(), signature.AsSpan()));
}
public bool BlsVerify(BlsPublicKey publicKey, Hash32 messageHash, BlsSignature signature, Domain domain)
{
BLSParameters blsParameters = new BLSParameters()
{
PublicKey = publicKey.AsSpan().ToArray()
};
using BLS signatureAlgorithm = SignatureAlgorithmFactory(blsParameters);
return(signatureAlgorithm.VerifyHash(messageHash.AsSpan(), signature.AsSpan(), domain.AsSpan()));
}
public CryptographyService(ChainConstants chainConstants,
IOptionsMonitor <MiscellaneousParameters> miscellaneousParameterOptions,
IOptionsMonitor <TimeParameters> timeParameterOptions,
IOptionsMonitor <StateListLengths> stateListLengthOptions,
IOptionsMonitor <MaxOperationsPerBlock> maxOperationsPerBlockOptions)
{
_chainConstants = chainConstants;
_miscellaneousParameterOptions = miscellaneousParameterOptions;
_timeParameterOptions = timeParameterOptions;
_stateListLengthOptions = stateListLengthOptions;
_maxOperationsPerBlockOptions = maxOperationsPerBlockOptions;
MiscellaneousParameters miscellaneousParameters = miscellaneousParameterOptions.CurrentValue;
TimeParameters timeParameters = timeParameterOptions.CurrentValue;
StateListLengths stateListLengths = stateListLengthOptions.CurrentValue;
MaxOperationsPerBlock maxOperationsPerBlock = maxOperationsPerBlockOptions.CurrentValue;
BLSParameters blsParameters = new BLSParameters();
_bls = BLS.Create(blsParameters);
Nethermind.Ssz.Ssz.Init(
chainConstants.DepositContractTreeDepth,
chainConstants.JustificationBitsLength,
miscellaneousParameters.MaximumValidatorsPerCommittee,
timeParameters.SlotsPerEpoch,
timeParameters.SlotsPerEth1VotingPeriod,
timeParameters.SlotsPerHistoricalRoot,
stateListLengths.EpochsPerHistoricalVector,
stateListLengths.EpochsPerSlashingsVector,
stateListLengths.HistoricalRootsLimit,
stateListLengths.ValidatorRegistryLimit,
maxOperationsPerBlock.MaximumProposerSlashings,
maxOperationsPerBlock.MaximumAttesterSlashings,
maxOperationsPerBlock.MaximumAttestations,
maxOperationsPerBlock.MaximumDeposits,
maxOperationsPerBlock.MaximumVoluntaryExits);
Nethermind.Ssz.Ssz.Init(
chainConstants.DepositContractTreeDepth,
chainConstants.JustificationBitsLength,
miscellaneousParameters.MaximumValidatorsPerCommittee,
timeParameters.SlotsPerEpoch,
timeParameters.SlotsPerEth1VotingPeriod,
timeParameters.SlotsPerHistoricalRoot,
stateListLengths.EpochsPerHistoricalVector,
stateListLengths.EpochsPerSlashingsVector,
stateListLengths.HistoricalRootsLimit,
stateListLengths.ValidatorRegistryLimit,
maxOperationsPerBlock.MaximumProposerSlashings,
maxOperationsPerBlock.MaximumAttesterSlashings,
maxOperationsPerBlock.MaximumAttestations,
maxOperationsPerBlock.MaximumDeposits,
maxOperationsPerBlock.MaximumVoluntaryExits);
}
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);
}
public BlsSignature SignRoot(BlsPublicKey blsPublicKey, Root root)
{
if (_publicKeyToBls.Count == 0)
{
var keyCount = GetPublicKeys().Count();
}
BLS bls = _publicKeyToBls[blsPublicKey];
byte[] destination = new byte[BlsSignature.Length];
bool success = bls.TrySignData(root.AsSpan(), destination, out int bytesWritten);
if (!success || bytesWritten != BlsSignature.Length)
{
throw new Exception($"Failure signing hash {root} for public key {blsPublicKey}.");
}
BlsSignature blsSignature = new BlsSignature(destination);
return(blsSignature);
}
public BlsSignature SignHashWithDomain(BlsPublicKey blsPublicKey, Hash32 hash, Domain domain)
{
if (_publicKeyToBls.Count == 0)
{
var keyCount = GetPublicKeys().Count();
}
BLS bls = _publicKeyToBls[blsPublicKey];
Span <byte> destination = stackalloc byte[BlsSignature.Length];
bool success = bls.TrySignHash(hash.AsSpan(), destination, out int bytesWritten, domain.AsSpan());
if (!success || bytesWritten != BlsSignature.Length)
{
throw new Exception($"Failure signing hash {hash}, domain {domain} for public key {blsPublicKey}.");
}
BlsSignature blsSignature = new BlsSignature(destination.ToArray());
return(blsSignature);
}
private static void EnsureKeys(TimeParameters timeParameters)
{
var keysRequired = (int)(ulong)timeParameters.SlotsPerEpoch * 16;
if (_testKeys.Count == keysRequired)
{
return;
}
_testKeys.Clear();
_privateKeys.Clear();
_publicKeys.Clear();
// Private key is ~255 bits (32 bytes) long
for (var keyNumber = 0; keyNumber < keysRequired; keyNumber++)
{
var privateKeySpan = new Span <byte>(new byte[32]);
// Key is big endian number, so write Int32 to last 4 bytes.
BitConverter.TryWriteBytes(privateKeySpan.Slice(28), keyNumber + 1);
if (BitConverter.IsLittleEndian)
{
// And reverse if necessary
privateKeySpan.Slice(28).Reverse();
}
var privateKey = privateKeySpan.ToArray();
var blsParameters = new BLSParameters()
{
PrivateKey = privateKey
};
using var bls = BLS.Create(blsParameters);
var publicKeyBytes = new byte[BlsPublicKey.Length];
bls.TryExportBLSPublicKey(publicKeyBytes, out var bytesWritten);
var publicKey = new BlsPublicKey(publicKeyBytes);
_privateKeys.Add(privateKey);
_publicKeys.Add(publicKey);
_testKeys[publicKey] = privateKey;
}
}
public BlsPublicKey BlsAggregatePublicKeys(IList <BlsPublicKey> publicKeys)
{
Span <byte> publicKeysSpan = new Span <byte>(new byte[publicKeys.Count() * BlsPublicKey.Length]);
int publicKeysSpanIndex = 0;
foreach (BlsPublicKey publicKey in publicKeys)
{
publicKey.AsSpan().CopyTo(publicKeysSpan.Slice(publicKeysSpanIndex));
publicKeysSpanIndex += BlsPublicKey.Length;
}
using BLS signatureAlgorithm = SignatureAlgorithmFactory(new BLSParameters());
byte[] aggregatePublicKey = new byte[BlsPublicKey.Length];
bool success =
signatureAlgorithm.TryAggregatePublicKeys(publicKeysSpan, aggregatePublicKey, out int bytesWritten);
if (!success || bytesWritten != BlsPublicKey.Length)
{
throw new Exception("Error generating aggregate public key.");
}
return(new BlsPublicKey(aggregatePublicKey));
}
private BlsSignature GetEpochSignature(IServiceProvider testServiceProvider, byte[] privateKey, ForkVersion forkVersion, Slot slot)
{
SignatureDomains signatureDomains = testServiceProvider.GetService <IOptions <SignatureDomains> >().Value;
BeaconChainUtility beaconChainUtility = testServiceProvider.GetService <BeaconChainUtility>();
var domain = beaconChainUtility.ComputeDomain(signatureDomains.Randao, forkVersion);
var epoch = beaconChainUtility.ComputeEpochAtSlot(slot);
var epochRoot = epoch.HashTreeRoot();
BLSParameters parameters = new BLSParameters()
{
PrivateKey = privateKey
};
BLS bls = BLS.Create(parameters);
var destination = new Span <byte>(new byte[96]);
bls.TrySignHash(epochRoot.AsSpan(), destination, out var bytesWritten, domain.AsSpan());
var signature = new BlsSignature(destination.ToArray());
return(signature);
}
public void QuickStartGenesis()
{
var quickStartParameters = _quickStartParameterOptions.CurrentValue;
_logger.LogWarning(0, "Mocked quick start with genesis time {GenesisTime} and {ValidatorCount} validators.",
quickStartParameters.GenesisTime, quickStartParameters.ValidatorCount);
var miscellaneousParameters = _miscellaneousParameterOptions.CurrentValue;
var gweiValues = _gweiValueOptions.CurrentValue;
var initialValues = _initialValueOptions.CurrentValue;
var timeParameters = _timeParameterOptions.CurrentValue;
var stateListLengths = _stateListLengthOptions.CurrentValue;
var maxOperationsPerBlock = _maxOperationsPerBlockOptions.CurrentValue;
var signatureDomains = _signatureDomainOptions.CurrentValue;
// Fixed amount
var amount = gweiValues.MaximumEffectiveBalance;
// Build deposits
var depositDataList = new List <DepositData>();
var deposits = new List <Deposit>();
for (var validatorIndex = 0uL; validatorIndex < quickStartParameters.ValidatorCount; validatorIndex++)
{
var privateKey = GeneratePrivateKey(validatorIndex);
// Public Key
var blsParameters = new BLSParameters()
{
PrivateKey = privateKey
};
using var bls = BLS.Create(blsParameters);
var publicKeyBytes = new Span <byte>(new byte[BlsPublicKey.Length]);
bls.TryExportBLSPublicKey(publicKeyBytes, out var publicKeybytesWritten);
var publicKey = new BlsPublicKey(publicKeyBytes);
// Withdrawal Credentials
var withdrawalCredentialBytes = _cryptographyService.Hash(publicKey.AsSpan()).AsSpan().ToArray();
withdrawalCredentialBytes[0] = initialValues.BlsWithdrawalPrefix;
var withdrawalCredentials = new Hash32(withdrawalCredentialBytes);
// Build deposit data
var depositData = new DepositData(publicKey, withdrawalCredentials, amount);
// Sign deposit data
var depositDataSigningRoot = depositData.SigningRoot();
var domain = _beaconChainUtility.ComputeDomain(signatureDomains.Deposit);
var destination = new Span <byte>(new byte[96]);
bls.TrySignHash(depositDataSigningRoot.AsSpan(), destination, out var bytesWritten, domain.AsSpan());
var depositDataSignature = new BlsSignature(destination);
depositData.SetSignature(depositDataSignature);
// Deposit
// TODO: This seems a very inefficient way (copied from tests) as it recalculates the merkle tree each time
// (you only need to add one node)
// TODO: Add some tests around quick start, then improve
var index = depositDataList.Count;
depositDataList.Add(depositData);
var root = depositDataList.HashTreeRoot((ulong)1 << _chainConstants.DepositContractTreeDepth);
var allLeaves = depositDataList.Select(x => x.HashTreeRoot());
var tree = CalculateMerkleTreeFromLeaves(allLeaves);
var merkleProof = GetMerkleProof(tree, index, 32);
var proof = new List <Hash32>(merkleProof);
var indexBytes = new Span <byte>(new byte[32]);
BitConverter.TryWriteBytes(indexBytes, (ulong)index + 1);
if (!BitConverter.IsLittleEndian)
{
indexBytes.Slice(0, 8).Reverse();
}
var indexHash = new Hash32(indexBytes);
proof.Add(indexHash);
var leaf = depositData.HashTreeRoot();
_beaconChainUtility.IsValidMerkleBranch(leaf, proof, _chainConstants.DepositContractTreeDepth + 1, (ulong)index, root);
var deposit = new Deposit(proof, depositData);
_logger.LogDebug("Quick start adding deposit for mocked validator {ValidatorIndex} with public key {PublicKey}.",
validatorIndex, publicKey);
deposits.Add(deposit);
}
var genesisState = _beaconChain.InitializeBeaconStateFromEth1(quickStartParameters.Eth1BlockHash, quickStartParameters.Eth1Timestamp, deposits);
// We use the state directly, and don't test IsValid
genesisState.SetGenesisTime(quickStartParameters.GenesisTime);
var store = _forkChoice.GetGenesisStore(genesisState);
_logger.LogDebug("Quick start genesis store created with genesis time {GenesisTime}.", store.GenesisTime);
}
public void QuickStartGenesis()
{
QuickStartParameters quickStartParameters = _quickStartParameterOptions.CurrentValue;
if (_logger.IsWarn())
{
Log.MockedQuickStart(_logger, quickStartParameters.GenesisTime, quickStartParameters.ValidatorCount, null);
}
GweiValues gweiValues = _gweiValueOptions.CurrentValue;
InitialValues initialValues = _initialValueOptions.CurrentValue;
SignatureDomains signatureDomains = _signatureDomainOptions.CurrentValue;
// Fixed amount
Gwei amount = gweiValues.MaximumEffectiveBalance;
// Build deposits
List <DepositData> depositDataList = new List <DepositData>();
List <Deposit> deposits = new List <Deposit>();
for (ulong validatorIndex = 0uL; validatorIndex < quickStartParameters.ValidatorCount; validatorIndex++)
{
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
byte[] withdrawalCredentialBytes = _cryptographyService.Hash(publicKey.AsSpan()).AsSpan().ToArray();
withdrawalCredentialBytes[0] = initialValues.BlsWithdrawalPrefix;
Hash32 withdrawalCredentials = new Hash32(withdrawalCredentialBytes);
// Build deposit data
DepositData depositData = new DepositData(publicKey, withdrawalCredentials, amount);
// Sign deposit data
Hash32 depositDataSigningRoot = _cryptographyService.SigningRoot(depositData);
Domain domain = _beaconChainUtility.ComputeDomain(signatureDomains.Deposit);
byte[] destination = new byte[96];
bls.TrySignHash(depositDataSigningRoot.AsSpan(), destination, out int bytesWritten, domain.AsSpan());
BlsSignature depositDataSignature = new BlsSignature(destination);
depositData.SetSignature(depositDataSignature);
// Deposit
// TODO: This seems a very inefficient way (copied from tests) as it recalculates the merkle tree each time
// (you only need to add one node)
// TODO: Add some tests around quick start, then improve
int index = depositDataList.Count;
depositDataList.Add(depositData);
//int depositDataLength = (ulong) 1 << _chainConstants.DepositContractTreeDepth;
Hash32 root = _cryptographyService.HashTreeRoot(depositDataList);
IEnumerable <Hash32> allLeaves = depositDataList.Select(x => _cryptographyService.HashTreeRoot(x));
IList <IList <Hash32> > tree = CalculateMerkleTreeFromLeaves(allLeaves);
IList <Hash32> merkleProof = GetMerkleProof(tree, index, 32);
List <Hash32> proof = new List <Hash32>(merkleProof);
Span <byte> indexBytes = new Span <byte>(new byte[32]);
BitConverter.TryWriteBytes(indexBytes, (ulong)index + 1);
if (!BitConverter.IsLittleEndian)
{
indexBytes.Slice(0, 8).Reverse();
}
Hash32 indexHash = new Hash32(indexBytes);
proof.Add(indexHash);
Hash32 leaf = _cryptographyService.HashTreeRoot(depositData);
_beaconChainUtility.IsValidMerkleBranch(leaf, proof, _chainConstants.DepositContractTreeDepth + 1, (ulong)index, root);
Deposit deposit = new Deposit(proof, depositData);
if (_logger.IsEnabled(LogLevel.Debug))
{
LogDebug.QuickStartAddValidator(_logger, validatorIndex, publicKey.ToString().Substring(0, 12),
null);
}
deposits.Add(deposit);
}
BeaconState genesisState = _beaconChain.InitializeBeaconStateFromEth1(quickStartParameters.Eth1BlockHash, quickStartParameters.Eth1Timestamp, deposits);
// We use the state directly, and don't test IsValid
genesisState.SetGenesisTime(quickStartParameters.GenesisTime);
IStore store = _forkChoice.GetGenesisStore(genesisState);
if (_logger.IsEnabled(LogLevel.Debug))
{
LogDebug.QuickStartStoreCreated(_logger, store.GenesisTime, null);
}
}
public Task <Eth1GenesisData> GetEth1GenesisDataAsync(CancellationToken cancellationToken)
{
QuickStartParameters quickStartParameters = _quickStartParameterOptions.CurrentValue;
if (_logger.IsWarn())
{
Log.MockedQuickStart(_logger, quickStartParameters.GenesisTime, quickStartParameters.ValidatorCount,
null);
}
GweiValues gweiValues = _gweiValueOptions.CurrentValue;
InitialValues initialValues = _initialValueOptions.CurrentValue;
TimeParameters timeParameters = _timeParameterOptions.CurrentValue;
SignatureDomains signatureDomains = _signatureDomainOptions.CurrentValue;
// Fixed amount
Gwei amount = gweiValues.MaximumEffectiveBalance;
// Build deposits
List <DepositData> depositDataList = new List <DepositData>();
List <Deposit> deposits = new List <Deposit>();
for (ulong validatorIndex = 0uL; validatorIndex < quickStartParameters.ValidatorCount; validatorIndex++)
{
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
byte[] withdrawalCredentialBytes = _cryptographyService.Hash(publicKey.AsSpan()).AsSpan().ToArray();
withdrawalCredentialBytes[0] = initialValues.BlsWithdrawalPrefix;
Bytes32 withdrawalCredentials = new Bytes32(withdrawalCredentialBytes);
// 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 = _cryptographyService.HashTreeRoot(depositMessage);
Root depositDataSigningRoot = _beaconChainUtility.ComputeSigningRoot(depositMessageRoot, domain);
byte[] destination = new byte[96];
bls.TrySignData(depositDataSigningRoot.AsSpan(), destination, out int bytesWritten);
BlsSignature depositDataSignature = new BlsSignature(destination);
depositData.SetSignature(depositDataSignature);
// Deposit
// TODO: This seems a very inefficient way (copied from tests) as it recalculates the merkle tree each time
// (you only need to add one node)
// TODO: Add some tests around quick start, then improve
int index = depositDataList.Count;
depositDataList.Add(depositData);
//int depositDataLength = (ulong) 1 << _chainConstants.DepositContractTreeDepth;
Root root = _cryptographyService.HashTreeRoot(depositDataList);
IEnumerable <Bytes32> allLeaves = depositDataList.Select(x =>
new Bytes32(_cryptographyService.HashTreeRoot((DepositData)x).AsSpan()));
IList <IList <Bytes32> > tree = CalculateMerkleTreeFromLeaves(allLeaves);
IList <Bytes32> merkleProof = GetMerkleProof(tree, index, 32);
List <Bytes32> proof = new List <Bytes32>(merkleProof);
byte[] indexBytes = new byte[32];
BinaryPrimitives.WriteInt32LittleEndian(indexBytes, index + 1);
Bytes32 indexHash = new Bytes32(indexBytes);
proof.Add(indexHash);
Bytes32 leaf = new Bytes32(_cryptographyService.HashTreeRoot(depositData).AsSpan());
_beaconChainUtility.IsValidMerkleBranch(leaf, proof, _chainConstants.DepositContractTreeDepth + 1,
(ulong)index, root);
Deposit deposit = new Deposit(proof, depositData);
if (_logger.IsEnabled(LogLevel.Debug))
{
LogDebug.QuickStartAddValidator(_logger, validatorIndex, publicKey.ToString().Substring(0, 12),
null);
}
deposits.Add(deposit);
}
ulong eth1Timestamp = quickStartParameters.Eth1Timestamp;
if (eth1Timestamp == 0)
{
eth1Timestamp = quickStartParameters.GenesisTime - (ulong)(1.5 * timeParameters.MinimumGenesisDelay);
}
else
{
ulong minimumEth1TimestampInclusive =
quickStartParameters.GenesisTime - 2 * timeParameters.MinimumGenesisDelay;
ulong maximumEth1TimestampInclusive =
quickStartParameters.GenesisTime - timeParameters.MinimumGenesisDelay - 1;
if (eth1Timestamp < minimumEth1TimestampInclusive)
{
if (_logger.IsEnabled(LogLevel.Warning))
{
Log.QuickStartEth1TimestampTooLow(_logger, eth1Timestamp, quickStartParameters.GenesisTime,
minimumEth1TimestampInclusive, null);
}
eth1Timestamp = minimumEth1TimestampInclusive;
}
else if (eth1Timestamp > maximumEth1TimestampInclusive)
{
if (_logger.IsEnabled(LogLevel.Warning))
{
Log.QuickStartEth1TimestampTooHigh(_logger, eth1Timestamp, quickStartParameters.GenesisTime,
maximumEth1TimestampInclusive, null);
}
eth1Timestamp = maximumEth1TimestampInclusive;
}
}
var eth1GenesisData = new Eth1GenesisData(quickStartParameters.Eth1BlockHash, eth1Timestamp,
deposits);
if (_logger.IsEnabled(LogLevel.Debug))
{
LogDebug.QuickStartGenesisDataCreated(_logger, eth1GenesisData.BlockHash, eth1GenesisData.Timestamp,
eth1GenesisData.Deposits.Count, null);
}
return(Task.FromResult(eth1GenesisData));
}
