public IEnumerable <HelloExtension> GenerateHelloExtensions()
{
if (_endConfig.End == ConnectionEnd.Server)
{
yield break;
}
var suites = _cipherSuiteProvider
.GetAllSupportedSuites(_cipherSuitesRegistry);
_config.SupportedAlgorithms = suites
.Select(x => (_cipherSuitesRegistry.MapHashAlgorithm(x), _cipherSuitesRegistry.MapSignatureAlgorithm(x)))
.Distinct()
.ToArray();
using (var ms = new MemoryStream())
{
var writer = new EndianBinaryWriter(EndianBitConverter.Big, ms);
writer.Write((ushort)(_config.SupportedAlgorithms.Count * 2));
foreach (var(hash, sig) in _config.SupportedAlgorithms)
{
writer.Write(hash.Id);
writer.Write(sig.Id);
}
yield return(new HelloExtension(ExtensionType.SignatureAlgorithms, ms.ToArray()));
}
}
public IState Run()
{
_versionConfig.Version = TLSVersion.TLS1_2;
_randomConfig.Client = GenerateClientRandom();
var cipherSuites = _cipherSuitesProvider
.GetAllSupportedSuites(_cipherSuitesRegistry)
.ToArray();
var compressionMethods = new[] { CompressionMethod.Null };
var extensions = _serviceProvider.ResolveAllExtensions();
var extensionHellos = extensions.SelectMany(x => x.GenerateHelloExtensions()).ToArray();
//TODO session id is not supported
_sessionConfig.Id = new byte[0];
var message = new ClientHelloMessage(
version: _versionConfig.Version,
randomBytes: _randomConfig.Client,
sessionId: _sessionConfig.Id,
extensions: extensionHellos,
cipherSuites: cipherSuites,
compressionMethods: compressionMethods);
_writer.Write(message);
return(_serviceProvider.GetRequiredService <WaitingForServerHelloState>());
}
