SFTP Public-Key Authentication

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

Download Chilkat Java Library

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    //  Important: It is helpful to send the contents of the
    //  sftp.LastErrorText property when requesting support.

    CkSFtp sftp = new CkSFtp();

    //  Any string automatically begins a fully-functional 30-day trial.
    boolean success;
    success = sftp.UnlockComponent("Anything for 30-day trial");
    if (success != true) {
        System.out.println(sftp.lastErrorText());
        return;
    }

    //  Set some timeouts, in milliseconds:
    sftp.put_ConnectTimeoutMs(5000);
    sftp.put_IdleTimeoutMs(15000);

    //  Connect to the SSH server.
    //  The standard SSH port = 22
    //  The hostname may be a hostname or IP address.
    int port;
    String hostname;
    hostname = "www.my-ssh-server.com";
    port = 22;
    success = sftp.Connect(hostname,port);
    if (success != true) {
        System.out.println(sftp.lastErrorText());
        return;
    }

    CkSshKey key = new CkSshKey();

    //  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.
    String privKey;
    privKey = key.loadText("myPrivateKey.pem");
    if (privKey == null ) {
        System.out.println(key.lastErrorText());
        return;
    }

    success = key.FromOpenSshPrivateKey(privKey);
    if (success != true) {
        System.out.println(key.lastErrorText());
        return;
    }

    //  Authenticate with the SSH server.  Chilkat SFTP supports
    //  both password-based authenication as well as public-key
    //  authentication.  This example uses password authenication.
    success = sftp.AuthenticatePk("myLogin",key);
    if (success != true) {
        System.out.println(sftp.lastErrorText());
        return;
    }

    System.out.println(sftp.lastErrorText());
    System.out.println("Public-Key Authentication Successful!");
  }
}