Add a Detached Signature (Separate Key, Header Control)

See more MIME Examples

Demonstrates the Chilkat Mime.AddDetachedSignaturePk2 method, which creates a detached signature with a separately supplied certificate and private key, and a third argument controlling transfer of the existing message header fields to the new outer entity.

Note: 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.

var
success: Integer;
mime: TChilkatMime;
cert: TChilkatCert;
privKey: TPrivateKey;
transferHeaderFields: Integer;

begin
success := 0;

mime := TChilkatMime.Create(Self);
success := mime.SetBodyFromPlainText('This message will be signed.');
if (success = 0) then
  begin
    Memo1.Lines.Add(mime.LastErrorText);
    Exit;
  end;
//  Load the certificate and its private key separately.
cert := TChilkatCert.Create(Self);
success := cert.LoadFromFile('qa_data/signer.cer');
if (success = 0) then
  begin
    Memo1.Lines.Add(cert.LastErrorText);
    Exit;
  end;

privKey := TPrivateKey.Create(Self);
success := privKey.LoadPemFile('qa_data/signer_privkey.pem');
if (success = 0) then
  begin
    Memo1.Lines.Add(privKey.LastErrorText);
    Exit;
  end;

//  Create a detached signature with separately supplied cert and private key, where the 3rd
//  argument controls whether the existing message header fields are transferred to the new outer
//  multipart/signed entity.
transferHeaderFields := 1;
success := mime.AddDetachedSignaturePk2(cert.ControlInterface,privKey.ControlInterface,transferHeaderFields);
if (success = 0) then
  begin
    Memo1.Lines.Add(mime.LastErrorText);
    Exit;
  end;

success := mime.SaveMime('qa_output/signed.eml');
if (success = 0) then
  begin
    Memo1.Lines.Add(mime.LastErrorText);
    Exit;
  end;
Memo1.Lines.Add('Detached signature added (headers transferred).');