Added SslStreamExtensions

Author: TalAloni

StandardSocketsHttpHandler/Net/Security/Extensions/SslStreamExtensions.cs

@@ -0,0 +1,40 @@
+using System;
+using System.Collections.Generic;
+using System.Reflection;
+using System.Security.Authentication;
+using System.Security.Cryptography.X509Certificates;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace System.Net.Security
+{
+    internal static class SslStreamExtensions
+    {
+        public static Task AuthenticateAsClientAsync(this SslStream sslStream, SslClientAuthenticationOptions sslClientAuthenticationOptions, CancellationToken cancellationToken)
+        {
+            return Task.Factory.FromAsync(
+                BeginAuthenticateAsClient,
+                iar => ((SslStream)iar.AsyncState).EndAuthenticateAsClient(iar),
+                sslClientAuthenticationOptions, cancellationToken,
+                sslStream);
+        }
+
+        public static IAsyncResult BeginAuthenticateAsClient(SslClientAuthenticationOptions sslClientAuthenticationOptions, CancellationToken cancellationToken, AsyncCallback asyncCallback, object asyncState)
+        {
+            // .NET Standard 2.0 and below
+            bool checkCertificateRevocation = (sslClientAuthenticationOptions.CertificateRevocationCheckMode != X509RevocationMode.NoCheck);
+            SslProtocols sslProtocols = sslClientAuthenticationOptions.EnabledSslProtocols;
+            try
+            {
+                return ((SslStream)asyncState).BeginAuthenticateAsClient(sslClientAuthenticationOptions.TargetHost, sslClientAuthenticationOptions.ClientCertificates, sslProtocols, checkCertificateRevocation, asyncCallback, asyncState);
+            }
+            catch (ArgumentException e) when (e.ParamName == "sslProtocolType")
+            {
+                // .NET Framework prior to 4.7 will throw an exception when SslProtocols.None is provided to BeginAuthenticateAsClient.
+                sslProtocols = SecurityProtocol.DefaultSecurityProtocols;
+                return ((SslStream)asyncState).BeginAuthenticateAsClient(sslClientAuthenticationOptions.TargetHost, sslClientAuthenticationOptions.ClientCertificates, sslProtocols, checkCertificateRevocation, asyncCallback, asyncState);
+            }
+        }
+    }
+}

StandardSocketsHttpHandler/StandardSocketsHttpHandler.csproj

@@ -10,6 +10,7 @@
   <ItemGroup Condition=" '$(TargetFramework)' == 'netstandard2.1' ">
     <Compile Remove="HashCode.cs" />
     <Compile Remove="IO\Extensions\StreamExtensions.cs" />
+    <Compile Remove="Net\Security\Extensions\SslStreamExtensions.cs" />
     <Compile Remove="Net\Security\SslApplicationProtocol.cs" />
     <Compile Remove="Net\Security\SslClientAuthenticationOptions.cs" />
   </ItemGroup>