Java

SFTP Public-Key Authentication

See more SFTP Examples

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

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[])
  {
    boolean success = false;

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

    CkSFtp sftp = new CkSFtp();

    //  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.
    String hostname = "sftp.example.com";
    int port = 22;
    success = sftp.Connect(hostname,port);
    if (success != true) {
        System.out.println(sftp.lastErrorText());
        return;
        }

    CkSshKey key = new CkSshKey();

    //  Load a PEM file into a string variable:
    //  (This does not load the PEM file into the key.  The LoadText
    //  method is a convenience method for loading the full contents of ANY text
    //  file into a string variable.)
    String privKey = key.loadText("myPrivateKey.pem");
    if (key.get_LastMethodSuccess() != true) {
        System.out.println(key.lastErrorText());
        return;
        }

    //  Load a private key from a PEM string:
    //  (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.
    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.  
    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!");
  }
}