(Delphi ActiveX) SFTP Public-Key Authentication (id_ed25519)

See more SFTP Examples

Demonstrates how to authenticate with an SSH/SFTP server using publickey authentication with an Ed25519 private key (id_ed25519).

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
key: TChilkatSshKey;
privKeyText: WideString;
success: Integer;
sftp: TChilkatSFtp;
hostname: WideString;
port: Integer;
success: Integer;

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

key := TChilkatSshKey.Create(Self);

// The id_ed25519 file should contain something like this:
// (You can open it in a text editor..)

// -----BEGIN OPENSSH PRIVATE KEY-----
// b3BlbnNzaC1rZXktdjEAAAAACmFlczI1Ni1jdHIAAAAGYmNyeXB0AAAAGAAAABDIeK9+Xw
// 6Do9gnhtrJu5iJAAAAZAAAAAEAAAAzAAAAC3NzaC1lZDI1NTE5AAAAIMh/Ge7fjQCssmVd
// BqjYZbRAI0pY8IrnB6J1yLetq34OAAAAoMVP7cvy4hTiAINA3I4v55OonkpKza8mzfUW18
// RDQeYL3ovCVaAYOGcCpf/SW3QiY6tnXq+5WDEfJ7Z/kQ0nl2+1wSLOytxpyO+IY0rRtLrX
// 6e/agR4nbZpt/MFG6xqcNASbtDgg+9IWGvDrtXOLFofx07/zml+UjFL0tXRpCjOxeqKyXH
// t8SRgdT97d9/bYPwapaXY+b2DVVy5/LVx4Sq8=
// -----END OPENSSH PRIVATE KEY-----

privKeyText := key.LoadText('c:/temp/id_ed25519');
if (key.LastMethodSuccess <> 1) then
  begin
    Memo1.Lines.Add(key.LastErrorText);
    Exit;
  end;

// If your private key was saved encrypted, then you'll need the password.
// In this example, the password "blahblah" is valid for the above key -- which is a real Ed25519 key generated/saved from puttygen.
key.Password := 'blahblah';

success := key.FromOpenSshPrivateKey(privKeyText);
if (success <> 1) then
  begin
    Memo1.Lines.Add(key.LastErrorText);
    Exit;
  end;

sftp := TChilkatSFtp.Create(Self);

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

hostname := 'sftp.example.com';
port := 22;
success := sftp.Connect(hostname,port);
if (success <> 1) then
  begin
    Memo1.Lines.Add(sftp.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
    Memo1.Lines.Add(sftp.LastErrorText);
    Exit;
  end;
Memo1.Lines.Add(sftp.LastErrorText);
Memo1.Lines.Add('Public-Key Authentication Successful!');

// Now go do whatever you're app needs to do...
end;