Pascal (Lazarus/Delphi)

Specify a Certificate for Encrypted Email

Demonstrates the Chilkat Email.AddEncryptCert method, which explicitly specifies a certificate to use when sending encrypted email. Call it once per recipient certificate; ClearEncryptCerts clears the list. This example loads a recipient certificate, registers it, and enables encrypted sending.

Background: When encrypting to multiple people, each recipient needs to be able to decrypt with their own private key. S/MIME handles this by encrypting the message's one-time content key separately under each recipient's public certificate and including all of those wrapped keys in the message. AddEncryptCert is how you build that recipient list — one call per certificate — giving explicit control over exactly whose certificates are used rather than relying on automatic lookup.

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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.Email,
  Chilkat.Cert;

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

procedure RunDemo;
var
  success: Boolean;
  email: TEmail;
  cert: TCert;

begin
  success := False;

  //  Demonstrates the AddEncryptCert method, which explicitly specifies a certificate for
  //  sending encrypted email.  Call it once per recipient certificate.  Use ClearEncryptCerts
  //  to clear the list.

  email := TEmail.Create;
  email.Subject := 'Encrypted email';
  email.Body := 'Encrypted to the specified recipient certificate(s).';
  email.From := 'alice@example.com';
  email.AddTo('Bob','bob@example.com');

  //  Load a recipient certificate (public key) and add it to the encryption cert list.
  cert := TCert.Create;
  success := cert.LoadFromFile('qa_data/certs/recipient.cer');
  if (success = False) then
    begin
      WriteLn(cert.LastErrorText);
      Exit;
    end;

  success := email.AddEncryptCert(cert);
  if (success = False) then
    begin
      WriteLn(email.LastErrorText);
      Exit;
    end;

  //  Request encrypted sending.
  email.SendEncrypted := True;

  WriteLn('Added the recipient''s encryption certificate.');

  //  Note: The path "qa_data/certs/recipient.cer" is a relative local filesystem path,
  //  relative to the current working directory of the running application.


  email.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.