Pascal (Lazarus/Delphi)

Find Certificate by Email Address

See more Cert Store Examples

Demonstrates how to find a certificate having the specified email address either within the cert's subject email, or the RFC822 name.

In an X.509 certificate, an email address can typically be located in two places:

1. RFC822 Name (Subject Alternative Name extension) -
   • The certificate may include an email address in the Subject Alternative Name (SAN) extension under the RFC822 Name field. This is a modern and preferred method because it allows for flexibility and alignment with security best practices.
   • To find it, Chilkat inspects the SAN extension in the certificate details.
2. Subject (Common Name or Email Address attribute) -
   • Older certificates may store the email address directly in the Subject field, typically under the Email Address attribute ("emailAddress") or, less commonly, the Common Name (CN).
   • This method is less preferred in modern standards but can still be encountered in legacy implementations. Chilkat also searches here for the email address.

Note: Requires Chilkat v10.1.2 or later.

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,
  Chilkat.CertStore,
  Chilkat.JsonObject;

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

procedure RunDemo;
var
  success: Boolean;
  certStore: TCertStore;
  readOnly: Boolean;
  json: TJsonObject;
  email_address: string;
  cert: TCert;

begin
  success := False;

  certStore := TCertStore.Create;

  //  This opens the Current User certificate store on Windows,
  //  On MacOS and iOS it opens the default Keychain.
  readOnly := False;
  success := certStore.OpenCurrentUserStore(readOnly);
  if (success = False) then
    begin
      WriteLn(certStore.LastErrorText);
      Exit;
    end;

  //  Find the certificate having the specified email address in either the RFC822 Name or in the Subject.
  json := TJsonObject.Create;
  email_address := 'joe@example.com';
  json.UpdateString('email',email_address);

  cert := TCert.Create;
  success := certStore.FindCert(json,cert);
  if (success = True) then
    begin
      //  Show the full distinguished name of the certificate.
      WriteLn('Found: ' + cert.SubjectDN);
    end
  else
    begin
      WriteLn('Not found.');
    end;


  certStore.Free;
  json.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.