(Delphi ActiveX) SFTP use Cert's Private Key for Authentication (Windows)

Demonstrates how to use the private key of a pre-installed certificate (on Windows) for SFTP authentication. The certificate's private key must be marked as "exportable" when originally installed.

Chilkat for Delphi Downloads Chilkat ActiveX DLL for Delphi Chilkat non-ActiveX DLL for Delphi * The examples here use the ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
cert: TChilkatCert;
success: Integer;
privKey: IPrivateKey;
privKeyPem: WideString;
sshKey: TChilkatSshKey;
sftp: TChilkatSFtp;

begin
// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

cert := TChilkatCert.Create(Self);

// Load the certificate from the Windows certificate store
success := cert.LoadByCommonName('my_cert_common_name');
if (success = 0) then
  begin
    Memo1.Lines.Add(cert.LastErrorText);
    Exit;
  end;

// Get the private key.  
privKey := cert.ExportPrivateKey();
if (cert.LastMethodSuccess = 0) then
  begin
    Memo1.Lines.Add(cert.LastErrorText);
    Exit;
  end;

privKeyPem := privKey.GetPkcs8Pem();
if (privKey.LastMethodSuccess = 0) then
  begin
    Memo1.Lines.Add(privKey.LastErrorText);
    Exit;
  end;

sshKey := TChilkatSshKey.Create(Self);
success := sshKey.FromOpenSshPrivateKey(privKeyPem);
if (success = 0) then
  begin
    Memo1.Lines.Add(sshKey.LastErrorText);
    Exit;
  end;

// Connect to an SSH/SFTP server
sftp := TChilkatSFtp.Create(Self);
success := sftp.Connect('sftp.example.com',22);
if (success = 0) then
  begin
    Memo1.Lines.Add(sftp.LastErrorText);
    Exit;
  end;

// Authenticate with the SSH server using a username + private key.
// (The private key serves as the password.  The username identifies
// the SSH user account on the server.)
success := sftp.AuthenticatePk('mySshLogin',sshKey.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(sftp.LastErrorText);
    Exit;
  end;

Memo1.Lines.Add('OK, the connection and authentication with the SSH server is completed.');

// This example is only to show the connection + authentication using a private key associated with a certificate in the Windows certificate store...
end;