(Objective-C) PKCS11 Export Public Key from HSM

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Demonstrates how to export a public key from a smartcard or token.

Note: This example requires Chilkat v9.5.0.96 or later.

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#import <CkoPkcs11.h>
#import <NSString.h>
#import <CkoJsonObject.h>
#import <CkoPublicKey.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];

// Use the PKCS11 driver (.dll, .so, .dylib) for your particular HSM.
// (The format of the path will change with the operating system.  Obviously, "C:/" is not used on non-Windows systems.
pkcs11.SharedLibPath = @"C:/Program Files (x86)/Gemalto/IDGo 800 PKCS#11/IDPrimePKCS1164.dll";

// Establish a logged-on session. (We can typically skip the login by passing an empty PIN if only working with public keys)
// Use your actual PIN here, or an empty string to skip login.
NSString *pin = @"0000";
int userType = 1;
BOOL success = [pkcs11 QuickSession: [NSNumber numberWithInt: userType] pin: pin];
if (success == NO) {
    NSLog(@"%@",pkcs11.LastErrorText);
    return;
}

// Get the handle of the public key we wish to export.
// You can find public keys in many different ways.
// This example will search for a public key by label.

// Provide a template to find a PKCS11 object.
CkoJsonObject *jsonTemplate = [[CkoJsonObject alloc] init];

// Find the public key with the label "Belgium eHealth".
[jsonTemplate UpdateString: @"class" value: @"public_key"];
[jsonTemplate UpdateString: @"label" value: @"Belgium eHealth"];

unsigned long pubKeyHandle = [pkcs11 FindObject: jsonTemplate];
if (pubKeyHandle == 0) {
    NSLog(@"%@",pkcs11.LastErrorText);
    return;
}

// Export to a Chilkat public key object.
CkoPublicKey *pubKey = [[CkoPublicKey alloc] init];
success = [pkcs11 ExportPublicKey: pubKeyHandle pubKey: pubKey];
if (success == NO) {
    NSLog(@"%@",pkcs11.LastErrorText);
    return;
}

// Get the public key as PKCS8 PEM.
NSLog(@"%@",[pubKey GetPem: NO]);

[pkcs11 Logout];
[pkcs11 CloseSession];