Delphi DLL

PKCS11 Find Certificate with Key Usage on Smart Card or USB Token

See more PKCS11 Examples

Demonstrates how to find and return the 1st certificate on a smart card or USB token with a desired intended key usage.

Note: This example requires Chilkat v9.5.0.91 or later.

Delphi DLL

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

...

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

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();

CkPkcs11_putSharedLibPath(pkcs11,'aetpkss1.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 with an intended key usage.
// Possible key usages to find are:
// 
// DigitalSignature
// NonRepudiation
// KeyEncipherment
// DataEncipherment
// CertificateSigning
// CrlSigning
// 
// To find a cert having any one of several usages, pass a comma-separated list of usages:
success := CkPkcs11_FindCert(pkcs11,'keyUsage','NonRepudiation,DigitalSignature',cert);
if (success = True) then
  begin
    Memo1.Lines.Add('Cert with private key: ' + CkCert__subjectCN(cert));
  end
else
  begin
    Memo1.Lines.Add('No certificates having the intended key usage were found.');
  end;

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

// 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);

end;