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

See more ScMinidriver Examples

Demonstrates how to use a certificate + private key located on a smart card for the TLS client certificate in an HTTPS request.

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

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

...

procedure TForm1.Button1Click(Sender: TObject);
var
scmd: HCkScMinidriver;
readerName: PWideChar;
success: Boolean;
retval: Integer;
certPart: PWideChar;
partValue: PWideChar;
cert: HCkCert;
http: HCkHttp;
responseBody: PWideChar;

begin
// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

scmd := CkScMinidriver_Create();

// Reader names (smart card readers or USB tokens) can be discovered
// via List Readers or Find Smart Cards
readerName := 'SCM Microsystems Inc. SCR33x USB Smart Card Reader 0';
success := CkScMinidriver_AcquireContext(scmd,readerName);
if (success = False) then
  begin
    Memo1.Lines.Add(CkScMinidriver__lastErrorText(scmd));
    Exit;
  end;

// If successful, the name of the currently inserted smart card is available:
Memo1.Lines.Add('Card name: ' + CkScMinidriver__cardName(scmd));

// If desired, perform regular PIN authentication with the smartcard.
// For more details about smart card PIN authentication, see the Smart Card PIN Authentication Example
retval := CkScMinidriver_PinAuthenticate(scmd,'user','000000');
if (retval <> 0) then
  begin
    Memo1.Lines.Add('PIN Authentication failed.');
  end;

// You can find a cerficate using any of the following certificate parts:
// "subjectDN" -- The full distinguished name of the cert.
// "subjectDN_withTags" -- Same as above, but in a format that includes the subject part tags, such as the "CN=" in "CN=something"
// "subjectCN" -- The common name part (CN) of the certificate's subject.
// "serial" -- The certificate serial number.
// "serial:issuerCN" -- The certificate serial number + the issuer's common name, delimited with a colon char.
// These are the same certificate parts that can be retrieved by listing certificates on the smart card (or USB token).
// See List Certificates on Smart Card Example
certPart := 'subjectCN';
partValue := 'BadSSL Client Certificate';

// If the certificate is found, it is loaded into the cert object.
// Note: We imported this certificate from a .p12/.pfx using this Example to Import a .pfx/.p12 onto a Smart Card
cert := CkCert_Create();
success := CkScMinidriver_FindCert(scmd,certPart,partValue,cert);
if (success = False) then
  begin
    Memo1.Lines.Add('Failed to find the certificate.');
    CkScMinidriver_DeleteContext(scmd);
    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 ScMinidriver 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.
// If your application calls PinDeauthenticate or DeleteContext, the cert will no longer be able to sign on the smart card
// because the smart card ScMinidriver session will no longer be authenticated or deleted.

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

// 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));
    CkScMinidriver_DeleteContext(scmd);
    Exit;
  end;

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

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

// ------------------------------------------------------------------------------------------------------------
// Cleanup our ScMinidriver session...

// When finished with operations that required authentication, you may if you wish, deauthenticate the session.
success := CkScMinidriver_PinDeauthenticate(scmd,'user');
if (success = False) then
  begin
    Memo1.Lines.Add(CkScMinidriver__lastErrorText(scmd));
  end;

// Delete the context when finished with the card.
success := CkScMinidriver_DeleteContext(scmd);
if (success = False) then
  begin
    Memo1.Lines.Add(CkScMinidriver__lastErrorText(scmd));
  end;

CkScMinidriver_Dispose(scmd);
CkCert_Dispose(cert);
CkHttp_Dispose(http);

end;