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(C#) PKCS11 Find Specific Certificate on Smart Card or USB Token

See more PKCS11 Examples

This example code shows how to find a particular certificate on a smart card or USB token.

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

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// 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();

pkcs11.SharedLibPath = "aetpkss1.dll";

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

// We need to call Discover to get the slot ID.
// (A slot is a smart card reader or USB token.)
bool onlyTokensPresent = true;
Chilkat.JsonObject json = new Chilkat.JsonObject();
success = pkcs11.Discover(onlyTokensPresent,json);
if (success == false) {
    Debug.WriteLine(pkcs11.LastErrorText);
    return;
}

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

// Get the ID of the 1st slot
int slotID = json.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.
// 
// If we don't authenticate, then we won't be able to see the private keys, and thus
// we won't know which certificates have an associated private key stored on the smart card.

// The smart card PIN is passed to the Login method.
// userType 1 indicates a "Normal User".
int userType = 1;
string pin = "0000";
success = pkcs11.Login(userType,pin);
if (success == false) {
    Debug.WriteLine(pkcs11.LastErrorText);
    success = pkcs11.CloseSession();
    return;
}

// --------------------------------------------------------------------------
// The FindCert method can find a particular certificate in a number of different ways.
// I'll demonstrate some common ways..

// 1) In many cases you'll be working with a smart card that contains one certificate that is to be used for 
// signing, and it is the certificate that is associated with the private key also stored on the smart card (or USB token).
// There may be other certificates on the card, but these are the issuer certificates in the chain of authentication.
// You're just interested in getting the certificate with the private key.
// You can do it like this:
Chilkat.Cert cert = new Chilkat.Cert();
// Pass the keyword "privateKey" in the 1st argument, and an empty string in the 2nd arg.
// This returns the 1st certificate that has a private key.
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.");
}

// 2) Find a certificate by the Subject Common Name
success = pkcs11.FindCert("subjectCN","Chil application account (8c9be8e0-5544-4cd0-9062-290fbff353a7)",cert);
if (success == true) {
    Debug.WriteLine("Found: " + cert.SubjectCN);
}
else {
    Debug.WriteLine("Not found: " + cert.SubjectCN);
}

// 3) Find a certificate by hex serial number
success = pkcs11.FindCert("serial","5087bf1feda006af54a02f23a851104948acc26f",cert);
if (success == true) {
    Debug.WriteLine("Found: " + cert.SerialNumber);
}
else {
    Debug.WriteLine("Not found: " + cert.SerialNumber);
}

// 4) Find a certificate by hex serial number and Issuer Common Name
success = pkcs11.FindCert("serial:issuerCN","5087bf1feda006af54a02f23a851104948acc26f:Ibanity Production Third Party Application CA",cert);
if (success == true) {
    Debug.WriteLine("Found: " + cert.SubjectCN);
}
else {
    Debug.WriteLine("Not found: " + cert.SubjectCN);
}

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

// 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.");

 

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