private static async Task <string> TestSslProtocol(string hostName, int port, SslProtocols p, string testDescription)
{
//Console.WriteLine($"P:{p}");
await Task.Yield();
var sb = new StringBuilder();
Stopwatch sw = Stopwatch.StartNew();
var actualProtocol = SslProtocols.None;
try
{
using (var socket = new Socket(SocketType.Stream, ProtocolType.Tcp))
{
socket.Connect(hostName, port);
var networkStream = new NetworkStream(socket, false);
var sslStream = new SslStream(networkStream);
var clientCerts = new System.Security.Cryptography.X509Certificates.X509CertificateCollection();
sslStream.AuthenticateAsClient(hostName, clientCerts, p, true);
actualProtocol = sslStream.SslProtocol;
sw.Stop();
sb.AppendLine($"{testDescription}: Allowed, Duration={sw.ElapsedMilliseconds}ms, Protocols Allowed: {p.ToStringExpanded()}, Protocol Used: {actualProtocol}");
sb.AppendLine($" Cipher: {sslStream.CipherAlgorithm}, strength {sslStream.CipherStrength} bits");
sb.AppendLine($" Hash: {sslStream.HashAlgorithm}, strength {sslStream.HashStrength} bits");
sb.AppendLine($" Key exchange: {sslStream.KeyExchangeAlgorithm}, strength {sslStream.KeyExchangeStrength} bits");
}
}
catch (Exception)
{
sb.AppendLine($"{testDescription}: BLOCKED, Duration={sw.ElapsedMilliseconds}ms, Protocols Attempted: {p.ToStringExpanded()}");
}
return(sb.ToString());
}