Dart

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). Dart

import 'package:chilkat/chilkat.dart';

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

  final key = CkSshKey();

  // 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-----

  final String privKeyText;
  try {
    privKeyText = key.loadText('c:/temp/id_ed25519');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // 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';

  try {
    key.fromOpenSshPrivateKey(privKeyText);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  final sftp = CkSFtp();

  // Set some timeouts, in milliseconds:
  sftp.connectTimeoutMs = 5000;
  sftp.idleTimeoutMs = 15000;

  final hostname = 'sftp.example.com';
  final port = 22;
  try {
    sftp.connect(hostname, port);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Authenticate with the SSH server.  Chilkat SFTP supports
  // both password-based authenication as well as public-key
  // authentication.  
  try {
    sftp.authenticatePk('myLogin', key);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print(sftp.lastErrorText);
  print('Public-Key Authentication Successful!');

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