(Objective-C) PKCS11 Find Private Key by Label

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Demonstrates how to find a private key based on a user-specified label.

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

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#import <CkoPkcs11.h>
#import <NSString.h>
#import <CkoJsonObject.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.
// For example:
pkcs11.SharedLibPath = @"C:/Program Files (x86)/Gemalto/IDGo 800 PKCS#11/IDPrimePKCS11.dll";

// Use your HSM's PIN.
NSString *pin = @"0000";

// Normal user = 1
int userType = 1;

// Establish a logged-on user session with the HSM.
BOOL success = [pkcs11 QuickSession: [NSNumber numberWithInt: userType] pin: pin];
if (success == NO) {
    NSLog(@"%@",pkcs11.LastErrorText);
    return;
}

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

// Find an RSA private key with the label "MySshKey".
// Here's an example of how the key was originally imported: 
// PKCS11 Import SSH Key
[jsonTemplate UpdateString: @"class" value: @"private_key"];
[jsonTemplate UpdateString: @"key_type" value: @"rsa"];
[jsonTemplate UpdateString: @"label" value: @"MySshKey"];

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

// The private key handle is only valid during the PKCS11 session.
// If you wish to use the private key in another PKCS11 session,
// you'll first need to find it.  See:  
NSLog(@"%@%d",@"private key handle: ",privKeyHandle);

// Do whatever you wish with the private key handle...
// ...
// ...

[pkcs11 Logout];
[pkcs11 CloseSession];