Get the Certificate Used for Decryption

See more MIME Examples

Loads a CMS/PKCS #7 encrypted S/MIME message and decrypts it back to the original MIME content.

After a successful decryption, LastDecryptCert loads the certificate(s) actually used into a Cert object, indexed from zero up to NumDecryptCerts minus one.

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;
  pfxPassword: string;
  n: Integer;
  cert: TCert;
  i: Integer;

begin
  success := False;

  mime := TMime.Create;
  success := mime.LoadMimeFile('qa_data/encrypted.eml');
  if (success = False) then
    begin
      WriteLn(mime.LastErrorText);
      Exit;
    end;

  //  Configure a decryption source and decrypt.
  pfxPassword := 'myPfxPassword';
  success := mime.AddPfxSourceFile('qa_data/recipient.pfx',pfxPassword);
  if (success = False) then
    begin
      WriteLn(mime.LastErrorText);
      Exit;
    end;
  success := mime.Decrypt();
  if (success = False) then
    begin
      WriteLn(mime.LastErrorText);
      Exit;
    end;

  //  After a successful decryption, load the certificate(s) that were used.  The 1st argument is the
  //  zero-based index and the 2nd is a Cert that receives the certificate.
  n := mime.NumDecryptCerts;
  cert := TCert.Create;

  for i := 0 to n - 1 do
    begin
      success := mime.LastDecryptCert(i,cert);
      if (success = False) then
        begin
          WriteLn(mime.LastErrorText);
          Exit;
        end;
      WriteLn('Decrypted with: ' + cert.SubjectCN);
    end;



  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.