Delphi ActiveX

Check if a MIME Tree Contains Signed Parts

Demonstrates the Chilkat Mime.ContainsSignedParts method, which returns whether the currently visible MIME tree contains a complete detached or opaque CMS/PKCS #7 signed entity. It takes no arguments.

Note: The file path is relative to the application's current working directory. Absolute paths may also be used. Supply the path to your own file.

Background: Where IsSigned asks whether the top entity is a signature wrapper, this scans the whole tree for a signed part nested anywhere inside — useful when signing is applied to a sub-part rather than the outermost entity. It is the discovery step before deciding whether verification is needed.

Chilkat Delphi ActiveX Downloads

Download Chilkat for Delphi ActiveX

Delphi ActiveX

var
success: Integer;
mime: TChilkatMime;

begin
success := 0;

//  Demonstrates the Mime.ContainsSignedParts method, which returns whether the MIME tree contains a complete CMS/PKCS #7 signed entity.  It takes no arguments.

mime := TChilkatMime.Create(Self);
success := mime.LoadMimeFile('qa_data/message.eml');
if (success = 0) then
  begin
    Memo1.Lines.Add(mime.LastErrorText);
    Exit;
  end;

if (mime.ContainsSignedParts()) then
  begin
    Memo1.Lines.Add('The message tree contains a signed part.');
  end
else
  begin
    Memo1.Lines.Add('The message tree contains no signed part.');
  end;