(Delphi ActiveX) Get Certificate Subject Part by Name or OID

Demonstrates the GetSubjectPart method where a name or OID can be passed.

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

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
cert: TChilkatCert;
success: Integer;
serialNum: WideString;

begin
cert := TChilkatCert.Create(Self);

success := cert.LoadByCommonName('myCert');
if (success = 0) then
  begin
    Memo1.Lines.Add(cert.LastErrorText);
    Exit;
  end;

// This example demonstrates getting the SERIALNUMBER part of the subject,
// if one such part exists in the cert's subject.
// Not too many certicates include the serial number in the Subject.
// (Chilean issued certificates for SII is one such case where the SERIALNUMBER part exists within the Subject.)
serialNum := cert.GetSubjectPart('SERIALNUMBER');
if (cert.LastMethodSuccess = 0) then
  begin
    Memo1.Lines.Add('No SERIALNUMBER part exists.');
    Exit;
  end;

Memo1.Lines.Add(serialNum);

// We could also get the part by the OID.
// See https://oidref.com/2.5.4.5 for a list of OID's in the 2.5.4.* range..
// The OID for SERIALNUMBER is "2.5.4.5"
serialNum := cert.GetSubjectPart('2.5.4.5');
if (cert.LastMethodSuccess = 0) then
  begin
    Memo1.Lines.Add('No SERIALNUMBER part exists.');
    Exit;
  end;

Memo1.Lines.Add(serialNum);
end;