Delphi DLL

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.

Delphi DLL

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, XmlCertVault, Pkcs11, Cert;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
pkcs11: HCkPkcs11;
slotID: Integer;
readWrite: Boolean;
userType: Integer;
pin: PWideChar;
cert: HCkCert;
certVault: HCkXmlCertVault;

begin
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.

pkcs11 := CkPkcs11_Create();

// 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.
CkPkcs11_putSharedLibPath(pkcs11,'bit4xpki.dll');

success := CkPkcs11_Initialize(pkcs11);
if (success = False) then
  begin
    Memo1.Lines.Add(CkPkcs11__lastErrorText(pkcs11));
    Exit;
  end;

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

// Open a session.
readWrite := True;
success := CkPkcs11_OpenSession(pkcs11,slotID,readWrite);
if (success = False) then
  begin
    Memo1.Lines.Add(CkPkcs11__lastErrorText(pkcs11));
    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 := CkPkcs11_Login(pkcs11,userType,pin);
if (success = False) then
  begin
    Memo1.Lines.Add(CkPkcs11__lastErrorText(pkcs11));
    success := CkPkcs11_CloseSession(pkcs11);
    Exit;
  end;

// Get the certificate (on the smart card) that has a private key.
cert := CkCert_Create();
success := CkPkcs11_FindCert(pkcs11,'privateKey','',cert);
if (success = True) then
  begin
    Memo1.Lines.Add('Cert with private key: ' + CkCert__subjectCN(cert));
  end
else
  begin
    Memo1.Lines.Add('No certificates having a private key were found.');
    success := CkPkcs11_CloseSession(pkcs11);
    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 := CkXmlCertVault_Create();
// 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 := CkXmlCertVault_AddCertFile(certVault,'someDir/caIntermediateCert.cer');
// ...
success := CkXmlCertVault_AddCertFile(certVault,'someDir/caCert.cer');
// (Your code should check the return value to make sure it succeeded.)

success := CkCert_UseCertVault(cert,certVault);
if (success = False) then
  begin
    Memo1.Lines.Add(CkCert__lastErrorText(cert));
    success := CkPkcs11_CloseSession(pkcs11);
    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 := CkPkcs11_Logout(pkcs11);
if (success = False) then
  begin
    Memo1.Lines.Add(CkPkcs11__lastErrorText(pkcs11));
    success := CkPkcs11_CloseSession(pkcs11);
    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 := CkPkcs11_CloseSession(pkcs11);
if (success = False) then
  begin
    Memo1.Lines.Add(CkPkcs11__lastErrorText(pkcs11));
    Exit;
  end;

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

CkPkcs11_Dispose(pkcs11);
CkCert_Dispose(cert);
CkXmlCertVault_Dispose(certVault);

end;