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+/* SRP6SaslServer.java --
+ Copyright (C) 2003, 2006 Free Software Foundation, Inc.
+
+This file is a part of GNU Classpath.
+
+GNU Classpath 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 of the License, or (at
+your option) any later version.
+
+GNU Classpath 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 GNU Classpath; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, 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. */
+
+
+package gnu.javax.crypto.key.srp6;
+
+import gnu.java.security.hash.IMessageDigest;
+import gnu.java.security.util.Util;
+
+import gnu.javax.crypto.key.KeyAgreementException;
+import gnu.javax.crypto.key.IncomingMessage;
+import gnu.javax.crypto.key.OutgoingMessage;
+
+import java.math.BigInteger;
+
+/**
+ * A variation of the SRP-6 protocol as used in the SASL-SRP mechanism, for the
+ * Host (server side).
+ * <p>
+ * In this alternative, the exchange goes as follows:
+ *
+ * <pre>
+ * C -&gt; S: I (identifies self)
+ * S -&gt; C: N, g, s, B = 3v + g&circ;b (sends salt, b = random number)
+ * C -&gt; S: A = g&circ;a (a = random number)
+ * </pre>
+ *
+ * <p>
+ * All elements are computed the same way as in the standard version.
+ * <p>
+ * Reference:
+ * <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>
+ */
+public class SRP6SaslServer
+ extends SRP6TLSServer
+{
+ // default 0-arguments constructor
+
+ 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;
+ }
+}