Pascal (Lazarus/Delphi)

POP3 Read S/MIME Encrypted Email

Read S/MIME encrypted email. 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.EmailBundle,
  Chilkat.Email;

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

procedure RunDemo;
var
  success: Boolean;
  mailman: TMailMan;
  bundle: TEmailBundle;
  keepOnServer: Boolean;
  headersOnly: Boolean;
  numBodyLines: Integer;
  email: TEmail;
  i: Integer;

begin
  success := False;

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

  //  The mailman object is used for receiving (POP3) 
  //  and sending (SMTP) email.
  mailman := TMailMan.Create;

  //  Set the POP3 server's hostname
  mailman.MailHost := 'pop.example.com';

  //  Set the POP3 login/password.
  mailman.PopUsername := 'myLogin';
  mailman.PopPassword := 'myPassword';

  //  If running on Microsoft Windows, the Chilkat mailman
  //  will automatically search the registry-based certificate stores
  //  for matching certificates and private keys required for
  //  decryption.  However, on Linux, MAX OS X, and other
  //  operating systems, no such thing exists.  Therefore, you'll 
  //  need to specify one or more PFX (.p12 / .pfx) files as
  //  sources for locating the certs required for decyrption.
  success := mailman.AddPfxSourceFile('/pfxFiles/certs_and_keys_1.pfx','pfxPassword1');
  if (success = False) then
    begin
      WriteLn(mailman.LastErrorText);
      Exit;
    end;

  success := mailman.AddPfxSourceFile('/pfxFiles/certs_and_keys_2.pfx','pfxPassword2');
  if (success = False) then
    begin
      WriteLn(mailman.LastErrorText);
      Exit;
    end;

  //  ...
  //  Note: On MS Windows, it is not required to provide PFX sources
  //  if the needed certs and private keys are already installed
  //  on the system (in the registry-based certificate stores).

  //  Copy the all email from the user's POP3 mailbox 
  //  into a bundle object.  The email remains on the server.
  bundle := TEmailBundle.Create;
  keepOnServer := True;
  headersOnly := False;
  //  Irrelevent because we are NOT downloading headers-only
  numBodyLines := 0;
  success := mailman.FetchAll(keepOnServer,headersOnly,numBodyLines,bundle);
  if (success = False) then
    begin
      WriteLn(mailman.LastErrorText);
      Exit;
    end;

  //  S/MIME security envelopes are automatically "unwrapped" 
  //  when a message is retrieved from the server. Signed emails are automatically verified, and 
  //  encrypted emails are automatically decrypted, restoring the email to the original state before 
  //  signing and/or encrypting. Information about the signing and encrypting certificates can be 
  //  retrieved from the Email object (methods: GetSignedByCert, GetEncryptedByCert; 
  //  properties: SignedBy, EncryptedBy, SignaturesValid, Decrypted, ReceivedSigned, 
  //  ReceivedEncrypted).

  //  Loop over the bundle
  email := TEmail.Create;
  i := 0;
  while i < bundle.MessageCount do
    begin

      bundle.EmailAt(i,email);

      WriteLn(email.From);
      WriteLn(email.Subject);

      //  At this point, if the email was signed and/or encrypted, it is already "unwrapped", i.e.
      //  the email is already decrypted and in a state as if it were never signed or encrypted.
      //  You may check to see if the email was received encrypted or signed, and if so,
      //  whether it was successfully unwrapped and who signed or encrypted it:
      if (email.ReceivedEncrypted = True) then
        begin

          WriteLn('This email was encrypted when received.');
          if (email.Decrypted = True) then
            begin
              WriteLn('This email was successfully decrypted.  It was encrypted by:');
              WriteLn(email.EncryptedBy);
            end
          else
            begin
              WriteLn('This email was not decrypted.');
            end;
        end;
      if (email.ReceivedSigned = True) then
        begin

          WriteLn('This email was signed when received.');
          if (email.SignaturesValid = True) then
            begin
              WriteLn('The signature was verified.  It was signed by:');
              WriteLn(email.SignedBy);
            end
          else
            begin
              WriteLn('The signature verification failed.');
            end;
        end;

      //  The email's body, HTML body, attachments, etc.
      //  are decrypted and available just like any non-encrypted email.

      WriteLn('--');

      i := i + 1;
    end;



  mailman.Free;
  bundle.Free;
  email.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.