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: Boolean;
mime: HCkMime;
cert: HCkCert;
privKey: HCkPrivateKey;
transferHeaderFields: Boolean;

begin
success := False;

mime := CkMime_Create();
success := CkMime_SetBodyFromPlainText(mime,'This message will be signed.');
if (success = False) then
  begin
    Memo1.Lines.Add(CkMime__lastErrorText(mime));
    Exit;
  end;
//  Load the certificate and its private key separately.
cert := CkCert_Create();
success := CkCert_LoadFromFile(cert,'qa_data/signer.cer');
if (success = False) then
  begin
    Memo1.Lines.Add(CkCert__lastErrorText(cert));
    Exit;
  end;

privKey := CkPrivateKey_Create();
success := CkPrivateKey_LoadPemFile(privKey,'qa_data/signer_privkey.pem');
if (success = False) then
  begin
    Memo1.Lines.Add(CkPrivateKey__lastErrorText(privKey));
    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 := True;
success := CkMime_AddDetachedSignaturePk2(mime,cert,privKey,transferHeaderFields);
if (success = False) then
  begin
    Memo1.Lines.Add(CkMime__lastErrorText(mime));
    Exit;
  end;

success := CkMime_SaveMime(mime,'qa_output/signed.eml');
if (success = False) then
  begin
    Memo1.Lines.Add(CkMime__lastErrorText(mime));
    Exit;
  end;
Memo1.Lines.Add('Detached signature added (headers transferred).');

CkMime_Dispose(mime);
CkCert_Dispose(cert);
CkPrivateKey_Dispose(privKey);