Objective-C

PKCS11 Certificate Chain

See more PKCS11 Examples

Demonstrates how to make CA certs available for the certificate chain to be included when creating a signature (using a PKCS11 compatible smart card / USB token) such as for PDF, XMLDSig, etc.

Note: This example requires Chilkat v9.5.0.88 or later.

Objective-C

#import <CkoPkcs11.h>
#import <NSString.h>
#import <CkoCert.h>
#import <CkoXmlCertVault.h>

BOOL success = NO;

//  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];

//  You will use the DLL (or shared lib) provided by your smart card vendor, or a DLL compatible with your smart card.
//  On Windows, if the DLL is located in C:\Windows\System32, specify only the filename.
//  Otherwise provide the full path.
pkcs11.SharedLibPath = @"bit4xpki.dll";

success = [pkcs11 Initialize];
if (success == NO) {
    NSLog(@"%@",pkcs11.LastErrorText);
    return;
}

//  Pass -1 for the slotID to open a session on the first non-empty slot.
int slotID = -1;

//  Open a session.
BOOL readWrite = YES;
success = [pkcs11 OpenSession: [NSNumber numberWithInt: slotID] readWrite: readWrite];
if (success == NO) {
    NSLog(@"%@",pkcs11.LastErrorText);
    return;
}

//  Make it an authenticated session by calling Login.
int userType = 1;
//  Make sure to use the correct PIN for your smart card..
NSString *pin = @"0000";
success = [pkcs11 Login: [NSNumber numberWithInt: userType] pin: pin];
if (success == NO) {
    NSLog(@"%@",pkcs11.LastErrorText);
    success = [pkcs11 CloseSession];
    return;
}

//  Get the certificate (on the smart card) that has a private key.
CkoCert *cert = [[CkoCert alloc] init];
success = [pkcs11 FindCert: @"privateKey" partValue: @"" cert: cert];
if (success == YES) {
    NSLog(@"%@%@",@"Cert with private key: ",cert.SubjectCN);
}
else {
    NSLog(@"%@",@"No certificates having a private key were found.");
    success = [pkcs11 CloseSession];
    return;
}

//  If the certificates in the chain of authentication were contained on the smart card,
//  then Chilkat would already have them (via the FindCert function) and the certs in the chain will be automatically used
//  as needed when signing occurs.

//  If you have CA certs located elsewhere, such as in .cer files, you can make them available to Chilkat in the following way:

CkoXmlCertVault *certVault = [[CkoXmlCertVault alloc] init];
//  Please review the methods available in the XML certificate vault class.  Different methods exist for adding certificates
//  from various sources, such as PEM, PFX, or in-memory sources..
success = [certVault AddCertFile: @"someDir/caIntermediateCert.cer"];
//  ...
success = [certVault AddCertFile: @"someDir/caCert.cer"];
//  (Your code should check the return value to make sure it succeeded.)

success = [cert UseCertVault: certVault];
if (success == NO) {
    NSLog(@"%@",cert.LastErrorText);
    success = [pkcs11 CloseSession];
    return;
}

//  --------------------------------------------------------------------------
//  At this point, we have the cert (and certs in the chain of authentication) to be used for signing.
//  The code for using the certificate in creating the digital signature, such as for a PDF, XML, etc., go here...

//  --------------------------------------------------------------------------

//  Revert to an unauthenticated session by calling Logout.
success = [pkcs11 Logout];
if (success == NO) {
    NSLog(@"%@",pkcs11.LastErrorText);
    success = [pkcs11 CloseSession];
    return;
}

//  When finished, close the session.
//  It is important to close the session (memory leaks will occur if the session is not properly closed).
success = [pkcs11 CloseSession];
if (success == NO) {
    NSLog(@"%@",pkcs11.LastErrorText);
    return;
}

NSLog(@"%@",@"Success.");