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.

C#

bool success = false;

//  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.

Chilkat.Pkcs11 pkcs11 = new Chilkat.Pkcs11();

//  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 == false) {
    Debug.WriteLine(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 = true;
success = pkcs11.OpenSession(slotID,readWrite);
if (success == false) {
    Debug.WriteLine(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..
string pin = "0000";
success = pkcs11.Login(userType,pin);
if (success == false) {
    Debug.WriteLine(pkcs11.LastErrorText);
    success = pkcs11.CloseSession();
    return;
}

//  Get the certificate (on the smart card) that has a private key.
Chilkat.Cert cert = new Chilkat.Cert();
success = pkcs11.FindCert("privateKey","",cert);
if (success == true) {
    Debug.WriteLine("Cert with private key: " + cert.SubjectCN);
}
else {
    Debug.WriteLine("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:

Chilkat.XmlCertVault certVault = new Chilkat.XmlCertVault();
//  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 == false) {
    Debug.WriteLine(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 == false) {
    Debug.WriteLine(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 == false) {
    Debug.WriteLine(pkcs11.LastErrorText);
    return;
}

Debug.WriteLine("Success.");