(Objective-C) PKCS11 Find All Certificates on Smart Card or USB Token

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Sample code showing how to examine all the certificates on a smart card or USB token.

Note: This example requires Chilkat v9.5.0.88 or later.

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

// 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 = @"aetpkss1.dll";

BOOL 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;
}

// Call FindAllCerts to find all certificates on the smart card or USB token.
success = [pkcs11 FindAllCerts];
if (success == NO) {
    NSLog(@"%@",pkcs11.LastErrorText);
    success = [pkcs11 CloseSession];
    return;
}

// The NumCerts property is set by FindAllCerts.
int numCerts = [pkcs11.NumCerts intValue];
NSLog(@"%@%d",@"Number of certs: ",numCerts);

NSString *privateKeyNote = 0;
CkoCert *cert = [[CkoCert alloc] init];
int i = 0;
while (i < numCerts) {
    [pkcs11 GetCert: [NSNumber numberWithInt: i] cert: cert];
    privateKeyNote = @"";
    if ([cert HasPrivateKey] == YES) {
        privateKeyNote = @"(has private key)";
    }

    NSLog(@"%d%@%@%@%@",i,@": ",privateKeyNote,@" ",cert.SubjectDN);
    NSLog(@"%d%@%@",i,@": issuer: ",cert.IssuerDN);
    NSLog(@"%@",@"----");
    i = i + 1;
}

// 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.");