(C# UWP/WinRT) 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.

Chilkat Universal Windows Platform (UWP) / WinRT Downloads Chilkat for the Universal Windows Platform (UWP)

// 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";

bool success = pkcs11.Initialize();
if (success == false) {
    Debug.WriteLine(pkcs11.LastErrorText);
    return;
}

// We need to call Discover to get the slot ID.
bool onlyTokensPresent = true;
Chilkat.JsonObject jsonPkcs11 = new Chilkat.JsonObject();
success = pkcs11.Discover(onlyTokensPresent,jsonPkcs11);
if (success == false) {
    Debug.WriteLine(pkcs11.LastErrorText);
    return;
}

// Make sure we have at least one slot.
if (jsonPkcs11.SizeOfArray("slot") <= 0) {
    Debug.WriteLine("No occuplied slots.");
    return;
}

// Get the ID of the 1st slot
int slotID = jsonPkcs11.IntOf("slot[0].id");

// 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.");