(Objective-C) DKIM Signature using Windows Current User Certificate Store

This is a Windows-specific example to load a certificate from the Current User (registry-based) certificate store, and then use the certificate's associated private key for a DKIM signature.

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#import <CkoCert.h>
#import <CkoPrivateKey.h>
#import <CkoDkim.h>

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

CkoCert *cert = [[CkoCert alloc] init];

// The LoadByCommonName method searches the Windows Local Machine and Current User 
// registry-based certificate stores for a certificate having the common name specified. 
// If found, the certificate is loaded and ready for use.
BOOL success = [cert LoadByCommonName: @"My Certificate ABC"];
if (success != YES) {
    NSLog(@"%@",cert.LastErrorText);
    return;
}

// The certificate must have an associated private key installed, and it must be a
// private key that has been marked "exportable" when it was originally installed.
if (![cert HasPrivateKey]) {
    NSLog(@"%@",@"This certificate does not have a private key available.");
    return;
}

CkoPrivateKey *privKey = 0;

privKey = [cert ExportPrivateKey];
if (cert.LastMethodSuccess == NO) {
    NSLog(@"%@",cert.LastErrorText);
    return;
}

CkoDkim *dkim = [[CkoDkim alloc] init];

// Load the private key into the DKIM object:
success = [dkim LoadDkimPk: [privKey GetPkcs8Pem] optionalPassword: @""];
if (success != YES) {
    NSLog(@"%@",dkim.LastErrorText);
    return;
}

// The private key has been loaded into the DKIM object.  See the other DKIM
// examples for guidance on how to create a DKIM signature...