Secure FTP with Client Certificate

Chilkat FTP2 provides the ability to use a client certificate with secure FTP (implicit or explicit SSL/TLS). This example demonstrates how to load a certificate from a .pfx and use it as the client-side SSL cert. Note: Client-side certificates are only needed in situations where the server demands one.

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uses
    Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
    Dialogs, StdCtrls,
    CHILKATFTP2Lib_TLB,
    CHILKATCERTIFICATELib_TLB,
    OleCtrls;

...

procedure TForm1.Button1Click(Sender: TObject);
var
ftp: TChilkatFtp2;
success: Integer;
certStore: CHILKATCERTIFICATELib_TLB.IChilkatCertStore;
password: String;
cert: IChilkatCert;

begin
ftp := TChilkatFtp2.Create(Self);

//  Any string unlocks the component for the 1st 30-days.
success := ftp.UnlockComponent('Anything for 30-day trial');
if (success <> 1) then
  begin
    ShowMessage(ftp.LastErrorText);
    Exit;
  end;

ftp.Hostname := 'ftp.***.com';
ftp.Port := 21;
ftp.Username := 'test';
ftp.Password := 'test';

//  This example will use explict TLS/SSL.
//  Establish an explicit secure channel after connection
//  on the standard FTP port 21.
ftp.AuthTls := 1;

//  The Ssl property is for establishing an implicit SSL connection
//  on port 990.  Because this example uses explicit SSL, it
//  should remain 0.
ftp.Ssl := 0;

//  Load a certificate from a .pfx
//  A PFX may contain several certs, including the certificates
//  in a chain of authority.
certStore := CoChilkatCertStore.Create();

password := '***';
//  Load the certs from a PFX into an in-memory certificate store:
success := certStore.LoadPfxFile('chilkat.pfx',password);
if (success <> 1) then
  begin
    Memo1.Lines.Add(certStore.LastErrorText);
    Exit;
  end;

//  Find the exact cert we'll use:

cert := certStore.FindCertBySubject('Chilkat Software, Inc.') As IChilkatCert;
if (cert = nil ) then
  begin
    Memo1.Lines.Add('Certificate not found!');
    Exit;
  end;

//  Use this certificate for our secure (SSL/TLS) connection:
ftp.SetSslClientCert(cert As CHILKATFTP2Lib_TLB.IChilkatCert);

//  Connect and login to the FTP server.  The connection is
//  made secure because of the AuthTls setting.
success := ftp.Connect();
if (success <> 1) then
  begin
    ShowMessage(ftp.LastErrorText);
    Exit;
  end
else
  begin
    //  LastErrorText contains information even when
    //  successful. This allows you to visually verify
    //  that the secure connection actually occurred.
    Memo1.Lines.Add(ftp.LastErrorText);
  end;

ShowMessage('Secure FTP Channel Established!');

//  Do whatever you're doing to do ...
//  upload files, download files, etc...

//  .....
//  .....

ftp.Disconnect();
end;