Encrypt MIME for a Recipient Certificate

See more MIME Examples

Demonstrates encrypting the current MIME entity for a single recipient using the Mime.Encrypt method. The entity is replaced with CMS/PKCS #7 encrypted S/MIME that only the holder of the recipient's private key can read.

The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

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.Mime;

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

procedure RunDemo;
var
  success: Boolean;
  mime: TMime;
  cert: TCert;

begin
  success := False;

  mime := TMime.Create;
  success := mime.SetBodyFromPlainText('This message will be encrypted.');
  if (success = False) then
    begin
      WriteLn(mime.LastErrorText);
      Exit;
    end;
  //  Load the recipient's certificate (public key only is sufficient for encrypting).
  cert := TCert.Create;
  success := cert.LoadFromFile('qa_data/recipient.cer');
  if (success = False) then
    begin
      WriteLn(cert.LastErrorText);
      Exit;
    end;

  //  Encrypt for the recipient.  The entity is replaced with CMS/PKCS #7 encrypted S/MIME that only
  //  the holder of the recipient's private key can decrypt.  The certificate must be RSA-based.
  success := mime.Encrypt(cert);
  if (success = False) then
    begin
      WriteLn(mime.LastErrorText);
      Exit;
    end;

  success := mime.SaveMime('qa_output/encrypted.eml');
  if (success = False) then
    begin
      WriteLn(mime.LastErrorText);
      Exit;
    end;
  WriteLn('Message encrypted.');


  mime.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.