Create an Opaque Signature with a Separate Private Key

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Demonstrates the Chilkat Mime.ConvertToSignedPk method, which creates an opaque signature using a signer certificate and its separately supplied private key. The first argument is the Cert and the second is the PrivateKey.

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;

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 an opaque signature when the certificate and private key are supplied separately.  The
//  1st argument is the signer certificate and the 2nd is its private key.
success := CkMime_ConvertToSignedPk(mime,cert,privKey);
if (success = False) then
  begin
    Memo1.Lines.Add(CkMime__lastErrorText(mime));
    Exit;
  end;

success := CkMime_SaveMime(mime,'qa_output/signed_opaque.eml');
if (success = False) then
  begin
    Memo1.Lines.Add(CkMime__lastErrorText(mime));
    Exit;
  end;
Memo1.Lines.Add('Message converted to an opaque signed message.');

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