(.NET Core C#) (PKCS11) Use a Smart Card Certificate + Private Key for SSL/TLS Authentication

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

// Note: Chilkat's PKCS11 implementation runs on Windows, Linux, Mac OS X, and other supported operating systems.

Chilkat.Pkcs11 pkcs11 = new Chilkat.Pkcs11();

// Set your shared lib path -- either a full path to the DLL, .so, or .dylib,
// or just the filename if the driver is in a location that can be automatically found. (Such as in C:\Windows\System32)
pkcs11.SharedLibPath = "C:/Program Files (x86)/Gemalto/IDGo 800 PKCS#11/IDPrimePKCS1164.dll";

bool success = pkcs11.Initialize();
if (success == false) {
    Debug.WriteLine(pkcs11.LastErrorText);
    return;
}

// Pass -1 for the slotID to open a session on the first non-empty slot.
int slotID = -1;

// Open a session.
bool readWrite = true;
success = pkcs11.OpenSession(slotID,readWrite);
if (success == false) {
    Debug.WriteLine(pkcs11.LastErrorText);
    return;
}

// Make it an authenticated session by calling Login.
// 
// If we don't authenticate, then we won't be able to see the private keys, and thus
// we won't know which certificates have an associated private key stored on the smart card.

// The smart card PIN is passed to the Login method.
// userType 1 indicates a "Normal User".
int userType = 1;
string pin = "0000";
success = pkcs11.Login(userType,pin);
if (success == false) {
    Debug.WriteLine(pkcs11.LastErrorText);
    success = pkcs11.CloseSession();
    return;
}

Chilkat.Cert cert = new Chilkat.Cert();

// Find a certificate by the Subject Common Name
success = pkcs11.FindCert("subjectCN","BadSSL Client Certificate",cert);
if (success == true) {
    Debug.WriteLine("Found: " + cert.SubjectCN);
}
else {
    Debug.WriteLine("Not found: " + cert.SubjectCN);
    success = pkcs11.CloseSession();
    return;
}

Debug.WriteLine("Successfully loaded the cert object from the smart card / USB token.");

// Note: When successful, the cert object is internally linked to the Pkcs11 object's authenticated session.
// The cert object can now be used to sign or do other cryptographic operations that occur on the smart card / USB token.

// ------------------------------------------------------------------------------------------------------------

// Send an HTTPS request to https://client.badssl.com
// https://client.badssl.com (part of the badssl.com service) lets you test authentication using client SSL certificates. 
// The client certificate can be downloaded from https://badssl.com/download/.
// This server returns 200 OK if the correct client certificate is provided, and 400 Bad Request otherwise.

Chilkat.Http http = new Chilkat.Http();

// Provide the client certificate (linked internally to our authenticated smartcard session)
success = http.SetSslClientCert(cert);
if (success == false) {
    Debug.WriteLine(http.LastErrorText);
    success = pkcs11.CloseSession();
    return;
}

string responseBody = http.QuickGetStr("https://client.badssl.com/");
if (http.LastMethodSuccess == false) {
    Debug.WriteLine(http.LastErrorText);
    success = pkcs11.CloseSession();
    return;
}

Debug.WriteLine("Response status code: " + Convert.ToString(http.LastStatus));
Debug.WriteLine("Response body: ");
Debug.WriteLine(responseBody);

// ------------------------------------------------------------------------------------------------------------
// Revert to an unauthenticated session by calling Logout.
success = pkcs11.Logout();
if (success == false) {
    Debug.WriteLine(pkcs11.LastErrorText);
    success = pkcs11.CloseSession();
    return;
}

// When finished, close the session.
// It is important to close the session (memory leaks will occur if the session is not properly closed).
success = pkcs11.CloseSession();
if (success == false) {
    Debug.WriteLine(pkcs11.LastErrorText);
    return;
}

Debug.WriteLine("Success.");