SFTP Public-Key Authentication

Demonstrates how to authenticate with an SSH server using publickey authentication.

Download Chilkat 32-bit SSH / SFTP ActiveX (.msi)

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Download All 64-bit Chilkat ActiveX Components (.zip)

uses
    Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
    Dialogs, StdCtrls,
    CHILKATRSALib_TLB,
    CHILKATSSHLib_TLB,
    OleCtrls;

...

procedure TForm1.Button1Click(Sender: TObject);
var
sftp: TChilkatSFtp;
success: Integer;
port: Integer;
hostname: String;
key: TChilkatSshKey;
privKey: String;

begin
//  Important: It is helpful to send the contents of the
//  sftp.LastErrorText property when requesting support.

sftp := TChilkatSFtp.Create(Self);

//  Any string automatically begins a fully-functional 30-day trial.
success := sftp.UnlockComponent('Anything for 30-day trial');
if (success <> 1) then
  begin
    ShowMessage(sftp.LastErrorText);
    Exit;
  end;

//  Set some timeouts, in milliseconds:
sftp.ConnectTimeoutMs := 5000;
sftp.IdleTimeoutMs := 15000;

//  Connect to the SSH server.
//  The standard SSH port = 22
//  The hostname may be a hostname or IP address.

hostname := 'www.my-ssh-server.com';
port := 22;
success := sftp.Connect(hostname,port);
if (success <> 1) then
  begin
    ShowMessage(sftp.LastErrorText);
    Exit;
  end;

key := TChilkatSshKey.Create(Self);

//  Load a private key from a PEM file:
//  (Private keys may be loaded from OpenSSH and Putty formats.
//  Both encrypted and unencrypted private key file formats
//  are supported.  This example loads an unencrypted private
//  key in OpenSSH format.
privKey := key.LoadText('myPrivateKey.pem');
if (Length(privKey) = 0 ) then
  begin
    ShowMessage(key.LastErrorText);
    Exit;
  end;

success := key.FromOpenSshPrivateKey(privKey);
if (success <> 1) then
  begin
    ShowMessage(key.LastErrorText);
    Exit;
  end;

//  Authenticate with the SSH server.  Chilkat SFTP supports
//  both password-based authenication as well as public-key
//  authentication.
success := sftp.AuthenticatePk('myLogin',key.ControlInterface);
if (success <> 1) then
  begin
    ShowMessage(sftp.LastErrorText);
    Exit;
  end;
ShowMessage(sftp.LastErrorText);
ShowMessage('Public-Key Authentication Successful!');
end;