Pascal (Lazarus/Delphi)

Get Text Certificate Extensions by OID

See more Certificates Examples

Demonstrates how to get text certificate extensions by OID. In this example, we have a certificate with the following OID extensions: 1.3.6.1.4.1.49952.5.8.5, 1.3.6.1.4.1.49952.5.8.6, 1.3.6.1.4.1.49952.5.8.7.

Most certificate extensions have values that are ASN.1 (binary). For the majority of cases, an application should call GetExtensionAsXml. For extensions known to have text values (such as the OIDs listed above), an application can instead call GetExtensionAsText.

The GetExtensionAsText method is added in Chilkat v9.5.0.89.

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.Cert;

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

procedure RunDemo;
var
  success: Boolean;
  cert: TCert;
  oid: string;
  str: string;

begin
  success := False;

  cert := TCert.Create;

  success := cert.LoadFromFile('qa_data/certs/PUH9.cer');
  if (success = False) then
    begin
      WriteLn(cert.LastErrorText);
      Exit;
    end;

  oid := '1.3.6.1.4.1.49952.5.8.5';
  str := cert.GetExtensionAsText(oid);
  if (cert.LastMethodSuccess = True) then
    begin
      WriteLn(oid + ': ' + str);
    end;

  oid := '1.3.6.1.4.1.49952.5.8.6';
  str := cert.GetExtensionAsText(oid);
  if (cert.LastMethodSuccess = True) then
    begin
      WriteLn(oid + ': ' + str);
    end;

  oid := '1.3.6.1.4.1.49952.5.8.7';
  str := cert.GetExtensionAsText(oid);
  if (cert.LastMethodSuccess = True) then
    begin
      WriteLn(oid + ': ' + str);
    end;


  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.