Delphi DLL

(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 DLL

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

...

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

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();

// 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)
CkPkcs11_putSharedLibPath(pkcs11,'C:/Program Files (x86)/Gemalto/IDGo 800 PKCS#11/IDPrimePKCS1164.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.
// 
// 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 := CkPkcs11_Login(pkcs11,userType,pin);
if (success = False) then
  begin
    Memo1.Lines.Add(CkPkcs11__lastErrorText(pkcs11));
    success := CkPkcs11_CloseSession(pkcs11);
    Exit;
  end;

cert := CkCert_Create();

// Find a certificate by the Subject Common Name
success := CkPkcs11_FindCert(pkcs11,'subjectCN','BadSSL Client Certificate',cert);
if (success = True) then
  begin
    Memo1.Lines.Add('Found: ' + CkCert__subjectCN(cert));
  end
else
  begin
    Memo1.Lines.Add('Not found: ' + CkCert__subjectCN(cert));
    success := CkPkcs11_CloseSession(pkcs11);
    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 := CkHttp_Create();

// Provide the client certificate (linked internally to our authenticated smartcard session)
success := CkHttp_SetSslClientCert(http,cert);
if (success = False) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    success := CkPkcs11_CloseSession(pkcs11);
    Exit;
  end;

responseBody := CkHttp__quickGetStr(http,'https://client.badssl.com/');
if (CkHttp_getLastMethodSuccess(http) = False) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    success := CkPkcs11_CloseSession(pkcs11);
    Exit;
  end;

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

// ------------------------------------------------------------------------------------------------------------
// 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);
CkHttp_Dispose(http);

end;