Objective-C

(PKCS11) Use a Smart Card Certificate + Private Key for SSL/TLS Authentication

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Demonstrates how to use a certificate + private key located on a smart card for the TLS client certificate in an HTTPS request. Objective-C

#import <CkoPkcs11.h>
#import <NSString.h>
#import <CkoCert.h>
#import <CkoHttp.h>

BOOL success = NO;

// 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.

CkoPkcs11 *pkcs11 = [[CkoPkcs11 alloc] init];

// 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";

success = [pkcs11 Initialize];
if (success == NO) {
    NSLog(@"%@",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 = YES;
success = [pkcs11 OpenSession: [NSNumber numberWithInt: slotID] readWrite: readWrite];
if (success == NO) {
    NSLog(@"%@",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;
NSString *pin = @"0000";
success = [pkcs11 Login: [NSNumber numberWithInt: userType] pin: pin];
if (success == NO) {
    NSLog(@"%@",pkcs11.LastErrorText);
    success = [pkcs11 CloseSession];
    return;
}

CkoCert *cert = [[CkoCert alloc] init];

// Find a certificate by the Subject Common Name
success = [pkcs11 FindCert: @"subjectCN" partValue: @"BadSSL Client Certificate" cert: cert];
if (success == YES) {
    NSLog(@"%@%@",@"Found: ",cert.SubjectCN);
}
else {
    NSLog(@"%@%@",@"Not found: ",cert.SubjectCN);
    success = [pkcs11 CloseSession];
    return;
}

NSLog(@"%@",@"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.

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

// Provide the client certificate (linked internally to our authenticated smartcard session)
success = [http SetSslClientCert: cert];
if (success == NO) {
    NSLog(@"%@",http.LastErrorText);
    success = [pkcs11 CloseSession];
    return;
}

NSString *responseBody = [http QuickGetStr: @"https://client.badssl.com/"];
if (http.LastMethodSuccess == NO) {
    NSLog(@"%@",http.LastErrorText);
    success = [pkcs11 CloseSession];
    return;
}

NSLog(@"%@%d",@"Response status code: ",[http.LastStatus intValue]);
NSLog(@"%@",@"Response body: ");
NSLog(@"%@",responseBody);

// ------------------------------------------------------------------------------------------------------------
// Revert to an unauthenticated session by calling Logout.
success = [pkcs11 Logout];
if (success == NO) {
    NSLog(@"%@",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 == NO) {
    NSLog(@"%@",pkcs11.LastErrorText);
    return;
}

NSLog(@"%@",@"Success.");