Add SslProtocol property to allow selecting it (#24)

Author: RoSchmiSec

source/nanoFramework.System.Net.Http-client/System.Net.Http-client.nfproj

@@ -109,7 +109,7 @@
   </ItemGroup>
   <ItemGroup>
     <None Include="..\key.snk" />
-    <None Include="\nanoFramework.System.Net.Http\packages.config" >
+    <None Include="\nanoFramework.System.Net.Http\packages.config">
       <Link>packages.config</Link>
     </None>
   </ItemGroup>

source/nanoFramework.System.Net.Http-server/System.Net.Http-server.nfproj

@@ -104,7 +104,7 @@
   </ItemGroup>
   <ItemGroup>
     <None Include="..\key.snk" />
-    <None Include="\nanoFramework.System.Net.Http\packages.config" >
+    <None Include="\nanoFramework.System.Net.Http\packages.config">
       <Link>packages.config</Link>
     </None>
   </ItemGroup>

source/nanoFramework.System.Net.Http/Http/System.Net.HttpListener.cs

@@ -89,6 +89,20 @@ public class HttpListener
         /// </summary>
         private Thread m_thAccept;
 
+        /// <summary>
+        /// SslProtocol which shall be used.
+        /// </summary>
+        private SslProtocols m_sslProtocols = SslProtocols.None;
+
+        /// <summary>
+        /// Gets or sets the <see cref="SslProtocol"/> which shall be used.
+        /// </summary>
+        public SslProtocols SslProtocols
+        {
+            get { return m_sslProtocols; }
+            set { m_sslProtocols = value; }
+        }
+
         /// <summary>
         /// Creates an HTTP or HTTPS listener on the standard ports.
         /// </summary>
@@ -395,7 +409,7 @@ private void AcceptThreadFunc()
                         // Once connection estiblished need to create secure stream and authenticate server.
                         netStream = new SslStream(clientSock);
 
-                        SslProtocols[] sslProtocols = new SslProtocols[] { SslProtocols.Default };
+                        SslProtocols[] sslProtocols = new SslProtocols[] { m_sslProtocols };
 
                         // Throws exception if fails.
                         ((SslStream)netStream).AuthenticateAsServer(m_httpsCert, sslProtocols);

source/nanoFramework.System.Net.Http/Http/System.Net.HttpWebRequest.cs

@@ -205,6 +205,11 @@ protected override void Dispose(bool disposing)
         /// </summary>
         private IWebProxy m_proxy;
 
+        /// <summary>
+        /// Select <see cref="SslProtocol"/> to be used for requests. The default is <see cref="SslProtocol.None"/> to force setting it.
+        /// </summary>
+        private SslProtocols m_sslProtocols = SslProtocols.None;
+
         /// <summary>
         /// Whether to use persistent connections.
         /// </summary>
@@ -356,6 +361,16 @@ public X509Certificate HttpsAuthentCert
             set { m_caCert = value; }
         }
 
+
+        /// <summary>
+        /// Gets or sets the <see cref="SslProtocol"/> which shall be used for requests.
+        /// </summary>
+        public SslProtocols SslProtocols
+        {
+            get { return m_sslProtocols; }
+            set { m_sslProtocols = value; }
+        }
+
         /// <summary>
         /// Gets or sets a timeout in milliseconds when writing to or reading
         /// from a stream.
@@ -1440,7 +1455,7 @@ private InputNetworkStreamWrapper EstablishConnection(Uri proxyServer, Uri targe
                     SslStream sslStream = new SslStream(retStream.m_Socket);
 
                     // Throws exception is fails.
-                    sslStream.AuthenticateAsClient(m_originalUrl.Host, null, m_caCert, SslProtocols.Default);
+                    sslStream.AuthenticateAsClient(m_originalUrl.Host, null, m_caCert, m_sslProtocols);
 
                     // Changes the stream to SSL stream.
                     retStream.m_Stream = sslStream;