Delphi DLL

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.

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var
success: Boolean;
mime: HCkMime;

begin
success := False;

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

mime := CkMime_Create();
success := CkMime_LoadMimeFile(mime,'qa_data/message.eml');
if (success = False) then
  begin
    Memo1.Lines.Add(CkMime__lastErrorText(mime));
    Exit;
  end;

if (CkMime_ContainsSignedParts(mime)) 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;

CkMime_Dispose(mime);