(Objective-C) Import an SSH Key to an HSM using PKCS11

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Demonstrates how to import an SSH private key to an HSM (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 <CkoSshKey.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;
}

// Create a PKCS11 template for importing the SSH key.
CkoJsonObject *jsonTemplate = [[CkoJsonObject alloc] init];

// Indicate the key is to be stored on the token (i.e. it is not a session-only key)
[jsonTemplate UpdateBool: @"token" value: YES];
// The key should have the ability to sign
[jsonTemplate UpdateBool: @"sign" value: YES];

// Let's provide a few attributes to help us find the this key at a later time.
// See SSH Public-Key Authentication using an HSM

// The ID is byte data, so it should be base64 or hex.
// Specify "id" if passing base64 data, "id_hex" for hexidecimal, or "id_ascii" for directly copying the ascii bytes of the string.
// You can provide any ID of your choice.  It is optional.
[jsonTemplate UpdateString: @"id_hex" value: @"0A0B0C0D01020304"];

// Optionally specify a label.
[jsonTemplate UpdateString: @"label" value: @"MySshKey"];

// Load the SSH key to be imported to the HSM (smartcard or token)
CkoSshKey *sshKey = [[CkoSshKey alloc] init];
sshKey.Password = @"password_of_the_encrypted_ppk_file";
NSString *ppkContents = [sshKey LoadText: @"c:/my_ssh_keys/someSshKey.ppk"];
success = [sshKey FromPuttyPrivateKey: ppkContents];
if (success == NO) {
    NSLog(@"%@",sshKey.LastErrorText);
    return;
}

// Import the SSH private key onto the HSM.
// The PKCS11 handle to the imported private key is returned.
// A 0 is returned on failure.
unsigned long privKeyHandle = [pkcs11 ImportSshKey: sshKey jsonTemplate: 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  SSH Public-Key Authentication using a Smartcard
NSLog(@"%@%d",@"private key handle: ",privKeyHandle);

NSLog(@"%@",@"Successfully imported the SSH key onto the HSM.");

[pkcs11 Logout];
[pkcs11 CloseSession];