Pascal (Lazarus/Delphi)

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). Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.SFtp,
  Chilkat.SshKey;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  key: TSshKey;
  privKeyText: string;
  sftp: TSFtp;
  hostname: string;
  port: Integer;

begin
  success := False;

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

  key := TSshKey.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 := key.LoadText('c:/temp/id_ed25519');
  if (key.LastMethodSuccess <> True) then
    begin
      WriteLn(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 <> True) then
    begin
      WriteLn(key.LastErrorText);
      Exit;
    end;

  sftp := TSFtp.Create;

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

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

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


  key.Free;
  sftp.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.