Delphi ActiveX

Check if a MIME Entity is Encrypted (S/MIME)

Demonstrates the Chilkat Mime.IsEncrypted method, which returns whether the entity is a CMS/PKCS #7 encrypted S/MIME wrapper. 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: This tells you a message is encrypted and must be decrypted before its real content is available — the trigger for supplying a recipient certificate and private key to Decrypt. Reading the body without decrypting first would just yield the opaque PKCS #7 blob.

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var
success: Integer;
mime: TChilkatMime;

begin
success := 0;

//  Demonstrates the Mime.IsEncrypted method, which returns whether the entity is a CMS/PKCS #7 encrypted S/MIME wrapper.  It takes no arguments.

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

if (mime.IsEncrypted()) then
  begin
    Memo1.Lines.Add('This is an encrypted S/MIME message.');
  end
else
  begin
    Memo1.Lines.Add('This is not an encrypted S/MIME message.');
  end;