Pascal (Lazarus/Delphi)

ScMinidriver - Find and Load Certificate from Smart Card or USB Token

See more ScMinidriver Examples

Demonstrates how to find and load a specific certificate located on a smart card or USB token. Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.ScMinidriver,
  Chilkat.Cert;

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

procedure RunDemo;
var
  success: Boolean;
  scmd: TScMinidriver;
  readerName: string;
  retval: Integer;
  certPart: string;
  partValue: string;
  cert: TCert;

begin
  success := False;

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

  scmd := TScMinidriver.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 := scmd.AcquireContext(readerName);
  if (success = False) then
    begin
      WriteLn(scmd.LastErrorText);
      Exit;
    end;

  //  If successful, the name of the currently inserted smart card is available:
  WriteLn('Card name: ' + scmd.CardName);

  //  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 := scmd.PinAuthenticate('user','000000');
  if (retval <> 0) then
    begin
      WriteLn('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 := 'PIVKey E42D60A759D39147A26E0AF2FB1183C5';

  //  If the certificate is found, it is loaded into the cert object.
  cert := TCert.Create;
  success := scmd.FindCert(certPart,partValue,cert);
  if (success = False) then
    begin
      WriteLn('Failed to find the certificate.');
    end
  else
    begin
      WriteLn('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.
    end;

  //  ...
  //  ...
  //  ...

  //  When finished with operations that required authentication, you may if you wish, deauthenticate the session.
  success := scmd.PinDeauthenticate('user');
  if (success = False) then
    begin
      WriteLn(scmd.LastErrorText);
    end;

  //  Delete the context when finished with the card.
  success := scmd.DeleteContext();
  if (success = False) then
    begin
      WriteLn(scmd.LastErrorText);
    end;


  scmd.Free;
  cert.Free;

end;

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

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.