Android™

SSH Host Key Fingerprint

See more SSH Examples

Demonstrates how to get the SSH server's host key fingerprint after connecting. Android™

// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    boolean success = false;

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

    CkSsh ssh = new CkSsh();

    String hostname = "ssh.example.com";
    int port = 22;
    success = ssh.Connect(hostname,port);
    if (success != true) {
        Log.i(TAG, ssh.lastErrorText());
        return;
        }

    // Get the classic MD5 fingeprint
    String md5_fingerprint = ssh.hostKeyFingerprint();
    Log.i(TAG, md5_fingerprint);

    // Sample output:
    // ssh-rsa 3072 21:b0:d8:41:4e:ef:78:10:20:af:01:b7:71:5d:eb:94

    // Starting in Chilkat v9.5.0.92, we can also get the SHA256 fingerprint.
    // (it is also possible to get fingerprints using other hash algorithms such as SHA384, SHA512, etc.)

    boolean includeKeyType = true;
    boolean includeHashName = true;
    String sha256_fingerprint = ssh.getHostKeyFP("SHA256",includeKeyType,includeHashName);
    Log.i(TAG, sha256_fingerprint);

    // Sample output:
    // ssh-rsa SHA256:Ufgj480OsdsCZRjj9sSNM6fpgIcSJ61RsIG8usndUIY=

    // The key type and hash name can be optionally included or not.
    includeKeyType = false;
    includeHashName = true;
    sha256_fingerprint = ssh.getHostKeyFP("SHA256",includeKeyType,includeHashName);
    Log.i(TAG, sha256_fingerprint);

    // SHA256:Ufgj480OsdsCZRjj9sSNM6fpgIcSJ61RsIG8usndUIY=

    includeKeyType = true;
    includeHashName = false;
    sha256_fingerprint = ssh.getHostKeyFP("SHA256",includeKeyType,includeHashName);
    Log.i(TAG, sha256_fingerprint);

    // ssh-rsa Ufgj480OsdsCZRjj9sSNM6fpgIcSJ61RsIG8usndUIY=

    includeKeyType = false;
    includeHashName = false;
    sha256_fingerprint = ssh.getHostKeyFP("SHA256",includeKeyType,includeHashName);
    Log.i(TAG, sha256_fingerprint);

    // Ufgj480OsdsCZRjj9sSNM6fpgIcSJ61RsIG8usndUIY=

  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}