(C# UWP/WinRT) SSL Server Example

Demonstrates how to create an SSL socket for accepting connections. This example is *very* simple in that it will create an SSL socket for accepting a single connection. It will read a message from the client, send a reply, and exit.

Chilkat Universal Windows Platform (UWP) / WinRT Downloads Chilkat for the Universal Windows Platform (UWP)

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

Chilkat.Socket listenSslSocket = new Chilkat.Socket();

// An SSL server needs a digital certificate.  This example loads it from a PFX file.

// Create an instance of a certificate store object, load a PFX file,
// locate the certificate we need, and use it.
// (a PFX file may contain more than one certificate.)
Chilkat.CertStore certStore = new Chilkat.CertStore();
// The 1st argument is the filename, the 2nd arg is the 
// PFX file's password:
bool success = certStore.LoadPfxFile("chilkat.pfx","test");
if (success != true) {
    Debug.WriteLine(certStore.LastErrorText);
    return;
}

// Find the certificate to be used for SSL:
Chilkat.Cert cert = null;
cert = certStore.FindCertBySubject("Chilkat Software, Inc.");
if (certStore.LastMethodSuccess == false) {
    Debug.WriteLine(certStore.LastErrorText);
    return;
}

// Use the certificate:
success = listenSslSocket.InitSslServer(cert);
if (success != true) {

    Debug.WriteLine(listenSslSocket.LastErrorText);
    return;
}

// Bind and listen on a port:
int myPort = 8123;
// Allow for a max of 5 queued connect requests.
int backLog = 5;
success = await listenSslSocket.BindAndListenAsync(myPort,backLog);
if (success != true) {
    Debug.WriteLine(listenSslSocket.LastErrorText);
    return;
}

// If accepting an SSL/TLS connection, the SSL handshake is part of the connection
// establishment process. This involves a few back-and-forth messages between the 
// client and server to establish algorithms and a shared key to create the secure 
// channel. The sending and receiving of these messages are governed by the 
// MaxReadIdleMs and MaxSendIdleMs properties. If these properties are set to 0 
// (and this is the default unless changed by your application), then the 
// AcceptNextConnection can hang indefinitely during the SSL handshake process. 
// Make sure these properties are set to appropriate values before calling AcceptNextConnection.

// Set a 10 second max for waiting to read/write.  This is for the SSL/TLS handshake establishment.
listenSslSocket.MaxReadIdleMs = 10000;
listenSslSocket.MaxSendIdleMs = 10000;

// Accept a single client connection and establish the secure SSL/TLS channel:
Chilkat.Socket clientSock = null;
int maxWaitMillisec = 20000;
clientSock = await listenSslSocket.AcceptNextConnectionAsync(maxWaitMillisec);
if (listenSslSocket.LastMethodSuccess == false) {
    Debug.WriteLine(listenSslSocket.LastErrorText);
    return;
}

// The client (in this example) is going to send a "Hello Server! -EOM-" 
// message.  Read it:
string receivedMsg = await clientSock.ReceiveUntilMatchAsync("-EOM-");
if (clientSock.LastMethodSuccess != true) {
    Debug.WriteLine(clientSock.LastErrorText);
    return;
}

Debug.WriteLine(receivedMsg);

// Send a "Hello Client! -EOM-" message:
success = await clientSock.SendStringAsync("Hello Client! -EOM-");
if (success != true) {
    Debug.WriteLine(clientSock.LastErrorText);
    return;
}

// Close the connection with the client
// Wait a max of 20 seconds (20000 millsec)
success = await clientSock.CloseAsync(20000);