Delphi ActiveX

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.

Delphi ActiveX

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Integer;
pkcs11: TChilkatPkcs11;
slotID: Integer;
readWrite: Integer;
userType: Integer;
pin: WideString;
cert: TChilkatCert;

begin
success := 0;

// 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.

pkcs11 := TChilkatPkcs11.Create(Self);

// Set your shared lib path -- either a full path to the DLL, .so, or .dylib,
// or just the filename if the driver is in a location that can be automatically found. (Such as in C:\Windows\System32)
pkcs11.SharedLibPath := 'C:/Program Files (x86)/Gemalto/IDGo 800 PKCS#11/IDPrimePKCS1164.dll';

success := pkcs11.Initialize();
if (success = 0) then
  begin
    Memo1.Lines.Add(pkcs11.LastErrorText);
    Exit;
  end;

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

// Open a session.
readWrite := 1;
success := pkcs11.OpenSession(slotID,readWrite);
if (success = 0) then
  begin
    Memo1.Lines.Add(pkcs11.LastErrorText);
    Exit;
  end;

// 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".
userType := 1;
pin := '0000';
success := pkcs11.Login(userType,pin);
if (success = 0) then
  begin
    Memo1.Lines.Add(pkcs11.LastErrorText);
    success := pkcs11.CloseSession();
    Exit;
  end;

// --------------------------------------------------------------------------
// 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:
cert := TChilkatCert.Create(Self);
// 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.ControlInterface);
if (success = 1) then
  begin
    Memo1.Lines.Add('Cert with private key: ' + cert.SubjectCN);
  end
else
  begin
    Memo1.Lines.Add('No certificates having a private key were found.');
  end;

// 2) Find a certificate by the Subject Common Name
success := pkcs11.FindCert('subjectCN','Chil application account (8c9be8e0-5544-4cd0-9062-290fbff353a7)',cert.ControlInterface);
if (success = 1) then
  begin
    Memo1.Lines.Add('Found: ' + cert.SubjectCN);
  end
else
  begin
    Memo1.Lines.Add('Not found: ' + cert.SubjectCN);
  end;

// 3) Find a certificate by hex serial number
success := pkcs11.FindCert('serial','5087bf1feda006af54a02f23a851104948acc26f',cert.ControlInterface);
if (success = 1) then
  begin
    Memo1.Lines.Add('Found: ' + cert.SerialNumber);
  end
else
  begin
    Memo1.Lines.Add('Not found: ' + cert.SerialNumber);
  end;

// 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.ControlInterface);
if (success = 1) then
  begin
    Memo1.Lines.Add('Found: ' + cert.SubjectCN);
  end
else
  begin
    Memo1.Lines.Add('Not found: ' + cert.SubjectCN);
  end;

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

// Revert to an unauthenticated session by calling Logout.
success := pkcs11.Logout();
if (success = 0) then
  begin
    Memo1.Lines.Add(pkcs11.LastErrorText);
    success := pkcs11.CloseSession();
    Exit;
  end;

// 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 = 0) then
  begin
    Memo1.Lines.Add(pkcs11.LastErrorText);
    Exit;
  end;

Memo1.Lines.Add('Success.');
end;