(Objective-C) PKCS11 Import an Existing RSA Public Key onto the HSM

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Demonstrates how to import an existing RSA Public Key onto a smart card or token.

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

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#import <CkoPkcs11.h>
#import <NSString.h>
#import <CkoRsa.h>
#import <CkoXml.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.
// (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.
NSString *pin = @"0000";
int userType = 1;
BOOL success = [pkcs11 QuickSession: [NSNumber numberWithInt: userType] pin: pin];
if (success == NO) {
    NSLog(@"%@",pkcs11.LastErrorText);
    return;
}

// Generate a new 2048-bit RSA key.
CkoRsa *rsa = [[CkoRsa alloc] init];
success = [rsa GenerateKey: [NSNumber numberWithInt: 2048]];
if (success == NO) {
    NSLog(@"%@",rsa.LastErrorText);
    return;
}

// Get the public key information as XML, so we can access the modulus and exponent.
CkoXml *xml = [[CkoXml alloc] init];
[xml LoadXml: [rsa ExportPublicKey]];

CkoJsonObject *attrs = [[CkoJsonObject alloc] init];
// Specify the type of object, and the type of key.
[attrs UpdateString: @"class" value: @"CKO_PUBLIC_KEY"];
[attrs UpdateString: @"key_type" value: @"CKK_RSA"];
// Add an optional label if desired.
[attrs UpdateString: @"label" value: @"RSA Public Key 1"];
// Allow the key to be use for verify, wrapping, and encryption operations.
[attrs UpdateBool: @"verify" value: YES];
[attrs UpdateBool: @"wrap" value: YES];
[attrs UpdateBool: @"encrypt" value: YES];

// Make this a session-only public key.
// To store the public key on the token so that it persists after the PKCS11 session, set token = YES.
[attrs UpdateBool: @"token" value: NO];

// Provide the RSA public key material
[attrs UpdateString: @"modulus" value: [xml GetChildContent: @"Modulus"]];
[attrs UpdateString: @"public_exponent" value: [xml GetChildContent: @"Exponent"]];

// Create the RSA public key.
// Returns the PKCS11 object handle of the created key.
unsigned long objHandle = [pkcs11 CreatePkcs11Object: attrs];
if (objHandle == 0) {
    NSLog(@"%@",pkcs11.LastErrorText);
    NSLog(@"%@",@"Failed.");
}
else {
    NSLog(@"%@%d",@"PKCS11 object handle = ",objHandle);
    NSLog(@"%@",@"Successfully imported an RSA key..");
}

[pkcs11 Logout];
[pkcs11 CloseSession];