--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/app/src/main/java/ch/ethz/ssh2/InteractiveCallback.java	Thu Dec 03 11:23:55 2015 -0800
@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2006-2011 Christian Plattner. All rights reserved.
+ * Please refer to the LICENSE.txt for licensing details.
+ */
+package ch.ethz.ssh2;
+
+/**
+ * An <code>InteractiveCallback</code> is used to respond to challenges sent
+ * by the server if authentication mode "keyboard-interactive" is selected.
+ *
+ * @see Connection#authenticateWithKeyboardInteractive(String,
+ *      String[], InteractiveCallback)
+ *
+ * @author Christian Plattner
+ * @version 2.50, 03/15/10
+ */
+
+public interface InteractiveCallback {
+    /**
+     * This callback interface is used during a "keyboard-interactive"
+     * authentication. Every time the server sends a set of challenges (however,
+     * most often just one challenge at a time), this callback function will be
+     * called to give your application a chance to talk to the user and to
+     * determine the response(s).
+     * <p>
+     * Some copy-paste information from the standard: a command line interface
+     * (CLI) client SHOULD print the name and instruction (if non-empty), adding
+     * newlines. Then for each prompt in turn, the client SHOULD display the
+     * prompt and read the user input. The name and instruction fields MAY be
+     * empty strings, the client MUST be prepared to handle this correctly. The
+     * prompt field(s) MUST NOT be empty strings.
+     * <p>
+     * Please refer to draft-ietf-secsh-auth-kbdinteract-XX.txt for the details.
+     * <p>
+     * Note: clients SHOULD use control character filtering as discussed in
+     * RFC4251 to avoid attacks by including
+     * terminal control characters in the fields to be displayed.
+     *
+     * @param name
+     *            the name String sent by the server.
+     * @param instruction
+     *            the instruction String sent by the server.
+     * @param numPrompts
+     *            number of prompts - may be zero (in this case, you should just
+     *            return a String array of length zero).
+     * @param prompt
+     *            an array (length <code>numPrompts</code>) of Strings
+     * @param echo
+     *            an array (length <code>numPrompts</code>) of booleans. For
+     *            each prompt, the corresponding echo field indicates whether or
+     *            not the user input should be echoed as characters are typed.
+     * @return an array of reponses - the array size must match the parameter
+     *         <code>numPrompts</code>.
+     */
+    public String[] replyToChallenge(String name, String instruction, int numPrompts, String[] prompt, boolean[] echo)
+    throws Exception;
+}