Delphi ActiveX

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. 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;
scmd: TChilkatScMinidriver;
readerName: WideString;
retval: Integer;
certPart: WideString;
partValue: WideString;
cert: TChilkatCert;

begin
success := 0;

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

scmd := TChilkatScMinidriver.Create(Self);

// 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 = 0) then
  begin
    Memo1.Lines.Add(scmd.LastErrorText);
    Exit;
  end;

// If successful, the name of the currently inserted smart card is available:
Memo1.Lines.Add('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
    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 := 'PIVKey E42D60A759D39147A26E0AF2FB1183C5';

// If the certificate is found, it is loaded into the cert object.
cert := TChilkatCert.Create(Self);
success := scmd.FindCert(certPart,partValue,cert.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add('Failed to find the certificate.');
  end
else
  begin
    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.
  end;

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

// When finished with operations that required authentication, you may if you wish, deauthenticate the session.
success := scmd.PinDeauthenticate('user');
if (success = 0) then
  begin
    Memo1.Lines.Add(scmd.LastErrorText);
  end;

// Delete the context when finished with the card.
success := scmd.DeleteContext();
if (success = 0) then
  begin
    Memo1.Lines.Add(scmd.LastErrorText);
  end;
end;