Pascal (Lazarus/Delphi)

Send Signed Email using PFX File (long version)

Demonstrates how to send a signed email using a digital certificate w/ private key stored in a PFX file. 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.MailMan,
  Chilkat.JsonObject,
  Chilkat.Cert,
  Chilkat.Email,
  Chilkat.CertStore;

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

procedure RunDemo;
var
  success: Boolean;
  mailman: TMailMan;
  email: TEmail;
  certStore: TCertStore;
  jsonE: TJsonObject;
  cert: TCert;
  cert2: TCert;

begin
  success := False;

  //  This example requires the Chilkat API to have been previously unlocked.
  //  See Global Unlock Sample for sample code.

  //  The mailman object is used for sending and receiving email.
  mailman := TMailMan.Create;

  //  Set the SMTP server.
  mailman.SmtpHost := 'smtp.mymailserver.com';

  //  Create a new email object
  email := TEmail.Create;

  email.Subject := 'This email is signed';
  email.Body := 'This is a digitally signed mail';
  email.From := 'Chilkat Admin <admin@chilkatsoft.com>';
  success := email.AddTo('Chilkat Support','support@chilkatsoft.com');

  //  Indicate that the email should be sent signed.
  email.SendSigned := True;

  //  Load a PFX file into a certificate store object.
  //  Then locate the certificate matching the  sender's email address,
  //  and use it for signing.
  //  (a PFX file may contain more than one certificate.)
  certStore := TCertStore.Create;
  //  The 1st argument is the path of the PFX file, the 2nd arg is the 
  //  PFX file's password:
  success := certStore.LoadPfxFile('/pfx_files/chilkatsoft_secret.pfx','secret');
  if (success <> True) then
    begin
      WriteLn(certStore.LastErrorText);
      Exit;
    end;

  //  Find the certificate for the email address:
  jsonE := TJsonObject.Create;
  jsonE.UpdateString('email','admin@chilkatsoft.com');

  cert := TCert.Create;
  success := certStore.FindCert(jsonE,cert);
  if (success = False) then
    begin
      WriteLn(certStore.LastErrorText);
      Exit;
    end;

  //  Alternatively, if a PFX file is known to contain a single certificate,
  //  you may load it directly into a Chilkat certificate object.
  //  This snippet of source code shows how:
  cert2 := TCert.Create;
  //  The 1st argument is the filename, the 2nd arg is the 
  //  PFX file's password:
  success := cert2.LoadPfxFile('/pfx_files/chilkatsoft_secret.pfx','secret');
  if (success <> True) then
    begin
      WriteLn(cert2.LastErrorText);
      Exit;
    end;

  //  This example will use the cert from the certStore...
  success := email.SetSigningCert(cert);

  //  Signed email can be sent in two different ways.  
  //  In a multipart/signed email, the signature is attached as a separate MIME part.
  //  In an opaque email (signedData) the content of the email is encapsulated within the signature
  //  and the email is sent as "application/pkcs7-mime". 
  //  Either should be fine, but some receiving systems might require one or the other..
  mailman.OpaqueSigning := False;

  //  Send a signed email.
  success := mailman.SendEmail(email);
  if (success <> True) then
    begin
      WriteLn(mailman.LastErrorText);
    end
  else
    begin
      //  The LastErrorText property provides information
      //  even when successful.
      WriteLn(mailman.LastErrorText);
      WriteLn('Mail Sent!');
    end;


  mailman.Free;
  email.Free;
  certStore.Free;
  jsonE.Free;
  cert.Free;
  cert2.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.