public bool IsSupported(CipherSuite suite)
{
if (!_registry.IsSupported(suite))
{
return(false);
}
if (!_cipherAlgorithmRegistry.IsSupported(_registry.MapCipherAlgorithm(suite)))
{
return(false);
}
if (!_cipherParameterFactoryProvider.IsSupported(_registry.MapCipherAlgorithm(suite)))
{
return(false);
}
if (!_hashAlgorithmRegistry.IsSupported(_registry.MapHashAlgorithm(suite)))
{
return(false);
}
if (!_prfHashRegistry.IsSupported(_registry.MapHashAlgorithm(suite)))
{
return(false);
}
if (!_signatureAlgorithmsRegistry.IsSupported(_registry.MapSignatureAlgorithm(suite)))
{
return(false);
}
if (!_signatureCipherParameterFactoryProvider.IsSupported(_registry.MapSignatureAlgorithm(suite)))
{
return(false);
}
if (!_keyExchangeProvider.IsSupported(_registry.MapKeyExchange(suite)))
{
return(false);
}
return(true);
}
public virtual bool IsCompatible(CipherSuite cipherSuite, X509Certificate certificate)
{
var signatureAlgorithm = CipherSuitesRegistry.MapSignatureAlgorithm(cipherSuite);
var requiresECKey = Equals(CipherSuitesRegistry.MapKeyExchange(cipherSuite), ECIdentifiers.ECDH);
if (signatureAlgorithm.Equals(ECIdentifiers.ECDSA))
{
if (certificate.SignatureAlgorithm.Algorithm != ECIdentifiers.ECDSAWithSHA256)
{
return(false);
}
if (!(certificate.SubjectPublicKey is ECPublicKey))
{
return(false);
}
return(true);
}
if (signatureAlgorithm.Equals(RSAIdentifiers.RSASig))
{
if (!RSAKeyReader.IsRSAIdentifier(certificate.SignatureAlgorithm.Algorithm))
{
return(false);
}
if (requiresECKey && !(certificate.SubjectPublicKey is ECPublicKey))
{
return(false);
}
if (!requiresECKey && !(certificate.SubjectPublicKey is RSAPublicKey))
{
return(false);
}
return(true);
}
return(false);
}
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()));
}
}
