Delphi ActiveX

Set the Decryption Certificate and Private Key

Demonstrates the Chilkat Email.SetDecryptCert2 method, which explicitly provides a certificate and its corresponding private key as separate objects for decrypting a received encrypted email. Set them before loading the encrypted message. This example loads a .cer certificate and a PEM private key, sets both, then loads an encrypted email.

Background: Sometimes the certificate and its private key are stored separately — a public .cer file plus a PEM (or other format) key file — rather than combined in a PFX. SetDecryptCert2 accepts the two objects individually, which is the natural fit for that arrangement. It is the two-object counterpart to SetDecryptCert, which takes a single certificate that already carries its private key.

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var
success: Integer;
email: TChilkatEmail;
cert: TChilkatCert;
privKey: TPrivateKey;

begin
success := 0;

//  Demonstrates the SetDecryptCert2 method, which explicitly provides a certificate and its
//  corresponding private key (as separate objects) for decrypting a received encrypted
//  email.  Set them before loading the encrypted email.

email := TChilkatEmail.Create(Self);

//  Load the certificate (public) and the matching private key from separate files.
cert := TChilkatCert.Create(Self);
success := cert.LoadFromFile('qa_data/certs/recipient.cer');
if (success = 0) then
  begin
    Memo1.Lines.Add(cert.LastErrorText);
    Exit;
  end;

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

//  Provide the certificate and private key to use for decryption.
success := email.SetDecryptCert2(cert.ControlInterface,privKey.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(email.LastErrorText);
    Exit;
  end;

//  Load the encrypted email; Chilkat decrypts it using the certificate and key.
success := email.LoadEml('qa_data/eml/encrypted.eml');
if (success = 0) then
  begin
    Memo1.Lines.Add(email.LastErrorText);
    Exit;
  end;

Memo1.Lines.Add('Decrypted = ' + IntToStr(Ord(email.Decrypted)));

//  Note: Paths such as "qa_data/..." are relative local filesystem paths,
//  relative to the current working directory of the running application.