/// <summary>
/// Returns the domain for the 'domain_type' and 'fork_version'
/// </summary>
public Domain ComputeDomain(DomainType domainType, ForkVersion forkVersion = new ForkVersion())
{
Span<byte> combined = stackalloc byte[Domain.Length];
domainType.AsSpan().CopyTo(combined);
forkVersion.AsSpan().CopyTo(combined.Slice(DomainType.Length));
return new Domain(combined);
}
/// <summary>
/// Returns the domain for the 'domain_type' and 'fork_version'
/// </summary>
public Domain ComputeDomain(DomainType domainType, ForkVersion forkVersion = new ForkVersion())
{
var combined = new Span <byte>(new byte[Domain.Length]);
domainType.AsSpan().CopyTo(combined);
forkVersion.AsSpan().CopyTo(combined.Slice(DomainType.Length));
return(new Domain(combined));
}
/// <summary>
/// Returns the domain for the 'domain_type' and 'fork_version'
/// </summary>
public Domain ComputeDomain(DomainType domainType, ForkVersion?forkVersion = null)
{
forkVersion ??= _initialValueOptions.CurrentValue.GenesisForkVersion;
Span <byte> combined = stackalloc byte[Domain.Length];
domainType.AsSpan().CopyTo(combined);
forkVersion.Value.AsSpan().CopyTo(combined.Slice(DomainType.Length));
return(new Domain(combined));
}
/// <summary>
/// Returns the domain for the 'domain_type' and 'fork_version'
/// </summary>
public Domain ComputeDomain(DomainType domainType, ForkVersion?forkVersion)
{
// TODO: Duplicate of BeaconChainUtility
if (forkVersion == null)
{
forkVersion = _initialValueOptions.CurrentValue.GenesisForkVersion;
}
Span <byte> combined = stackalloc byte[Domain.Length];
domainType.AsSpan().CopyTo(combined);
forkVersion.Value.AsSpan().CopyTo(combined.Slice(DomainType.Length));
return(new Domain(combined));
}
/// <summary>
/// Return the seed at ``epoch``.
/// </summary>
public Bytes32 GetSeed(BeaconState state, Epoch epoch, DomainType domainType)
{
Epoch mixEpoch = (Epoch)(epoch + _stateListLengthOptions.CurrentValue.EpochsPerHistoricalVector
- _timeParameterOptions.CurrentValue.MinimumSeedLookahead - 1UL);
// # Avoid underflow
Bytes32 mix = GetRandaoMix(state, mixEpoch);
Span <byte> seedHashInput = stackalloc byte[DomainType.Length + sizeof(ulong) + Bytes32.Length];
domainType.AsSpan().CopyTo(seedHashInput);
BinaryPrimitives.WriteUInt64LittleEndian(seedHashInput.Slice(DomainType.Length), epoch);
mix.AsSpan().CopyTo(seedHashInput.Slice(DomainType.Length + sizeof(ulong)));
Bytes32 seed = _cryptographyService.Hash(seedHashInput);
return(seed);
}
/// <summary>
/// Return the seed at ``epoch``.
/// </summary>
public Hash32 GetSeed(BeaconState state, Epoch epoch, DomainType domainType)
{
var mixEpoch = epoch + _stateListLengthOptions.CurrentValue.EpochsPerHistoricalVector
- _timeParameterOptions.CurrentValue.MinimumSeedLookahead - new Epoch(1);
// # Avoid underflow
var mix = GetRandaoMix(state, mixEpoch);
var seedHashInput = new Span <byte>(new byte[4 + 8 + 32]);
domainType.AsSpan().CopyTo(seedHashInput);
var epochBytes = BitConverter.GetBytes((ulong)epoch);
if (!BitConverter.IsLittleEndian)
{
epochBytes = epochBytes.Reverse().ToArray();
}
epochBytes.CopyTo(seedHashInput.Slice(4));
mix.AsSpan().CopyTo(seedHashInput.Slice(12));
var seed = _cryptographyService.Hash(seedHashInput);
return(seed);
}
