(Delphi ActiveX) 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 for Delphi Downloads Chilkat ActiveX DLL for Delphi Chilkat non-ActiveX DLL for Delphi * The examples here use the ActiveX DLL.

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
pkcs11: TChilkatPkcs11;
success: Integer;
slotID: Integer;
readWrite: Integer;
userType: Integer;
pin: WideString;
cert: TChilkatCert;
certVault: TChilkatXmlCertVault;

begin
// 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);

// 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 = 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.
userType := 1;
// Make sure to use the correct PIN for your smart card..
pin := '0000';
success := pkcs11.Login(userType,pin);
if (success = 0) then
  begin
    Memo1.Lines.Add(pkcs11.LastErrorText);
    success := pkcs11.CloseSession();
    Exit;
  end;

// Get the certificate (on the smart card) that has a private key.
cert := TChilkatCert.Create(Self);
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.');
    success := pkcs11.CloseSession();
    Exit;
  end;

// 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:

certVault := TChilkatXmlCertVault.Create(Self);
// 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.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(cert.LastErrorText);
    success := pkcs11.CloseSession();
    Exit;
  end;

// --------------------------------------------------------------------------
// 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 = 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;