Delphi ActiveX

Use a PFX TLS Client Certificate

Demonstrates the Chilkat MailMan.SetSslClientCertPfx method, which sets the client-side certificate for SSL/TLS connections, loading it from a PFX/PKCS#12 file. The first argument is the path to the PFX file and the second is its password. This example loads a client certificate directly from a PFX.

Background: This is the convenience form of SetSslClientCert: rather than loading a Cert object first, you point straight at the PFX file and password. A PFX (PKCS#12) bundles the certificate with its private key — exactly what mutual TLS requires, since the client must prove possession of the key during the handshake. It is the usual client-credential format on Windows.

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var
success: Integer;
mailman: TChilkatMailMan;

begin
success := 0;

//  Demonstrates the MailMan.SetSslClientCertPfx method, which sets the client-side
//  certificate for SSL/TLS connections, loading it from a PFX/PKCS#12 file.  The 1st argument
//  is the PFX path and the 2nd is the PFX password.

mailman := TChilkatMailMan.Create(Self);

//  Configure the SMTP server connection.
mailman.SmtpHost := 'smtp.example.com';
mailman.SmtpPort := 465;
mailman.SmtpSsl := 1;
mailman.SmtpUsername := 'user@example.com';
mailman.SmtpPassword := 'myPassword';

//  Load the client certificate directly from a PFX file.
success := mailman.SetSslClientCertPfx('qa_data/certs/client.pfx','pfx_password');
if (success = 0) then
  begin
    Memo1.Lines.Add(mailman.LastErrorText);
    Exit;
  end;

success := mailman.VerifySmtpLogin();
if (success = 0) then
  begin
    Memo1.Lines.Add(mailman.LastErrorText);
    Exit;
  end;

Memo1.Lines.Add('Connected using a PFX TLS client certificate.');

//  Note: The path "qa_data/certs/client.pfx" is a relative local filesystem path,
//  relative to the current working directory of the running application.