(Java) SSH Host Key Fingerprint

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

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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[])
  {
    // 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;
    boolean success = ssh.Connect(hostname,port);
    if (success != true) {
        System.out.println(ssh.lastErrorText());
        return;
        }

    // Get the classic MD5 fingeprint
    String md5_fingerprint = ssh.hostKeyFingerprint();
    System.out.println(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);
    System.out.println(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);
    System.out.println(sha256_fingerprint);

    // SHA256:Ufgj480OsdsCZRjj9sSNM6fpgIcSJ61RsIG8usndUIY=

    includeKeyType = true;
    includeHashName = false;
    sha256_fingerprint = ssh.getHostKeyFP("SHA256",includeKeyType,includeHashName);
    System.out.println(sha256_fingerprint);

    // ssh-rsa Ufgj480OsdsCZRjj9sSNM6fpgIcSJ61RsIG8usndUIY=

    includeKeyType = false;
    includeHashName = false;
    sha256_fingerprint = ssh.getHostKeyFP("SHA256",includeKeyType,includeHashName);
    System.out.println(sha256_fingerprint);

    // Ufgj480OsdsCZRjj9sSNM6fpgIcSJ61RsIG8usndUIY=
  }
}