package gnu.crypto.key.srp6;
// ----------------------------------------------------------------------------
// $Id: SRP6SaslServer.java,v 1.4 2005/10/06 04:24:16 rsdio Exp $
//
// Copyright (C) 2003 Free Software Foundation, Inc.
//
// This file is part of GNU Crypto.
//
// GNU Crypto is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2, or (at your option)
// any later version.
//
// GNU Crypto is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; see the file COPYING. If not, write to the
//
// Free Software Foundation Inc.,
// 51 Franklin Street, Fifth Floor,
// Boston, MA 02110-1301
// USA
//
// Linking this library statically or dynamically with other modules is
// making a combined work based on this library. Thus, the terms and
// conditions of the GNU General Public License cover the whole
// combination.
//
// As a special exception, the copyright holders of this library give
// you permission to link this library with independent modules to
// produce an executable, regardless of the license terms of these
// independent modules, and to copy and distribute the resulting
// executable under terms of your choice, provided that you also meet,
// for each linked independent module, the terms and conditions of the
// license of that module. An independent module is a module which is
// not derived from or based on this library. If you modify this
// library, you may extend this exception to your version of the
// library, but you are not obligated to do so. If you do not wish to
// do so, delete this exception statement from your version.
// ----------------------------------------------------------------------------
import gnu.crypto.hash.IMessageDigest;
import gnu.crypto.key.KeyAgreementException;
import gnu.crypto.key.IncomingMessage;
import gnu.crypto.key.OutgoingMessage;
import gnu.crypto.util.Util;
import java.math.BigInteger;
/**
* <p>A variation of the SRP-6 protocol as used in the SASL-SRP mechanism, for
* the Host (server side).</p>
*
* <p>In this alternative, the exchange goes as follows:</p>
* <pre>
* C -> S: I (identifies self)
* S -> C: N, g, s, B = 3v + g^b (sends salt, b = random number)
* C -> S: A = g^a (a = random number)
* </pre>
*
* <p>All elements are computed the same way as in the standard version.</p>
*
* <p>Reference:</p>
* <ol>
* <li><a href="http://www.ietf.org/internet-drafts/draft-burdis-cat-srp-sasl-09.txt">
* Secure Remote Password Authentication Mechanism</a><br>
* K. Burdis, R. Naffah.</li>
* <li><a href="http://srp.stanford.edu/design.html">SRP Protocol Design</a><br>
* Thomas J. Wu.</li>
* </ol>
*
* @version $Revision: 1.4 $
*/
public class SRP6SaslServer extends SRP6TLSServer {
// Constants and variables
// -------------------------------------------------------------------------
// Constructor(s)
// -------------------------------------------------------------------------
// default 0-arguments constructor
// Class methods
// -------------------------------------------------------------------------
// Instance methods
// -------------------------------------------------------------------------
protected OutgoingMessage computeSharedSecret(final IncomingMessage in)
throws KeyAgreementException {
super.computeSharedSecret(in);
final byte[] sBytes = Util.trim(K);
final IMessageDigest hash = srp.newDigest();
hash.update(sBytes, 0, sBytes.length);
K = new BigInteger(1, hash.digest());
return null;
}
}