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

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

...

procedure TForm1.Button1Click(Sender: TObject);
var
key: HCkSshKey;
privKeyText: PWideChar;
success: Boolean;
sftp: HCkSFtp;
hostname: PWideChar;
port: Integer;
success: Boolean;

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

key := CkSshKey_Create();

// 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 := CkSshKey__loadText(key,'c:/temp/id_ed25519');
if (CkSshKey_getLastMethodSuccess(key) <> True) then
  begin
    Memo1.Lines.Add(CkSshKey__lastErrorText(key));
    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.
CkSshKey_putPassword(key,'blahblah');

success := CkSshKey_FromOpenSshPrivateKey(key,privKeyText);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkSshKey__lastErrorText(key));
    Exit;
  end;

sftp := CkSFtp_Create();

// Set some timeouts, in milliseconds:
CkSFtp_putConnectTimeoutMs(sftp,5000);
CkSFtp_putIdleTimeoutMs(sftp,15000);

hostname := 'sftp.example.com';
port := 22;
success := CkSFtp_Connect(sftp,hostname,port);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkSFtp__lastErrorText(sftp));
    Exit;
  end;

// Authenticate with the SSH server.  Chilkat SFTP supports
// both password-based authenication as well as public-key
// authentication.  
success := CkSFtp_AuthenticatePk(sftp,'myLogin',key);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkSFtp__lastErrorText(sftp));
    Exit;
  end;
Memo1.Lines.Add(CkSFtp__lastErrorText(sftp));
Memo1.Lines.Add('Public-Key Authentication Successful!');

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

CkSshKey_Dispose(key);
CkSFtp_Dispose(sftp);

end;