Delphi DLL

Set Cert and Private Key for S/MIME Decryption

Demonstrates the Chilkat Imap.SetDecryptCert2 method, which specifies a certificate together with a separately supplied private key for decrypting S/MIME messages. The first argument is the Cert and the second is the PrivateKey. This example loads the certificate and key from separate files.

Note: The certificate path is relative to the application's current working directory. Supply the path to your own certificate file.

Background: Sometimes the certificate (the public part) and the private key are stored separately — a .cer alongside a PEM key file, for instance. This method pairs them explicitly, whereas SetDecryptCert expects a single Cert that already provides its private key. After the pairing, subsequently downloaded S/MIME messages are decrypted automatically.

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var
success: Boolean;
imap: HCkImap;
cert: HCkCert;
privKey: HCkPrivateKey;

begin
success := False;

//  Demonstrates the Imap.SetDecryptCert2 method, which specifies a certificate together with a
//  separately supplied private key for decrypting S/MIME messages.  The 1st argument is the
//  Cert and the 2nd is the PrivateKey.

imap := CkImap_Create();

CkImap_putSsl(imap,True);
CkImap_putPort(imap,993);

success := CkImap_Connect(imap,'imap.example.com');
if (success = False) then
  begin
    Memo1.Lines.Add(CkImap__lastErrorText(imap));
    Exit;
  end;
success := CkImap_Login(imap,'user@example.com','myPassword');
if (success = False) then
  begin
    Memo1.Lines.Add(CkImap__lastErrorText(imap));
    Exit;
  end;

//  Load the certificate and its private key from separate files.
cert := CkCert_Create();
success := CkCert_LoadFromFile(cert,'qa_data/smime.cer');
if (success = False) then
  begin
    Memo1.Lines.Add(CkCert__lastErrorText(cert));
    Exit;
  end;

privKey := CkPrivateKey_Create();
success := CkPrivateKey_LoadPemFile(privKey,'qa_data/smime_privkey.pem');
if (success = False) then
  begin
    Memo1.Lines.Add(CkPrivateKey__lastErrorText(privKey));
    Exit;
  end;

//  Use the cert and key to automatically decrypt subsequently downloaded S/MIME messages.
success := CkImap_SetDecryptCert2(imap,cert,privKey);
if (success = False) then
  begin
    Memo1.Lines.Add(CkImap__lastErrorText(imap));
    Exit;
  end;

success := CkImap_Disconnect(imap);
if (success = False) then
  begin
    Memo1.Lines.Add(CkImap__lastErrorText(imap));
    Exit;
  end;

CkImap_Dispose(imap);
CkCert_Dispose(cert);
CkPrivateKey_Dispose(privKey);