(Objective-C) Use Installed Cert on Windows for TLS Client Authentication

Demonstrates how to use a certificate that has already been installed on a Windows PC for TLS client authentication.

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#import <CkoHttp.h>
#import <CkoCert.h>

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

CkoHttp *http = [[CkoHttp alloc] init];

BOOL success;

// On Windows, a pre-installed certificate can be loaded in a number of different ways.
// This example loads by the common name:
CkoCert *cert = [[CkoCert alloc] init];
BOOL success = [cert LoadByCommonName: @"My ECA Medium Assurance Identity Certificate"];
if (success != YES) {
    NSLog(@"%@",cert.LastErrorText);
    return;
}

// Make sure this certificate has a private key available.  
// It should be a private key such that when the certificate was installed, it was marked as "exportable"
// so that authorized programs are able to access the private key.
if ([cert HasPrivateKey] != YES) {
    NSLog(@"%@",@"A private key is needed for TLS client authentication.");
    NSLog(@"%@",@"This certificate has no private key.");
    return;
}

// Set the certificate to be used for mutual TLS authentication
// (i.e. sets the client-side certificate for two-way TLS authentication)
success = [http SetSslClientCert: cert];
if (success != YES) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

// At this point, the HTTP object instance is setup with the client-side cert, and any SSL/TLS
// connection will automatically use it if the server demands a client-side cert.