Delphi ActiveX

(PKCS11) Use a Smart Card Certificate + Private Key for SSL/TLS Authentication

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Demonstrates how to use a certificate + private key located on a smart card for the TLS client certificate in an HTTPS request. 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;
http: TChilkatHttp;
responseBody: WideString;

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;

cert := TChilkatCert.Create(Self);

// Find a certificate by the Subject Common Name
success := pkcs11.FindCert('subjectCN','BadSSL Client Certificate',cert.ControlInterface);
if (success = 1) then
  begin
    Memo1.Lines.Add('Found: ' + cert.SubjectCN);
  end
else
  begin
    Memo1.Lines.Add('Not found: ' + cert.SubjectCN);
    success := pkcs11.CloseSession();
    Exit;
  end;

Memo1.Lines.Add('Successfully loaded the cert object from the smart card / USB token.');

// Note: When successful, the cert object is internally linked to the Pkcs11 object's authenticated session.
// The cert object can now be used to sign or do other cryptographic operations that occur on the smart card / USB token.

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

// Send an HTTPS request to https://client.badssl.com
// https://client.badssl.com (part of the badssl.com service) lets you test authentication using client SSL certificates. 
// The client certificate can be downloaded from https://badssl.com/download/.
// This server returns 200 OK if the correct client certificate is provided, and 400 Bad Request otherwise.

http := TChilkatHttp.Create(Self);

// Provide the client certificate (linked internally to our authenticated smartcard session)
success := http.SetSslClientCert(cert.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(http.LastErrorText);
    success := pkcs11.CloseSession();
    Exit;
  end;

responseBody := http.QuickGetStr('https://client.badssl.com/');
if (http.LastMethodSuccess = 0) then
  begin
    Memo1.Lines.Add(http.LastErrorText);
    success := pkcs11.CloseSession();
    Exit;
  end;

Memo1.Lines.Add('Response status code: ' + IntToStr(http.LastStatus));
Memo1.Lines.Add('Response body: ');
Memo1.Lines.Add(responseBody);

// ------------------------------------------------------------------------------------------------------------
// 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;