--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/share/classes/sun/security/krb5/internal/LocalSeqNumber.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,89 @@
+/*
+ * Portions Copyright 2000-2007 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Sun designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Sun in the LICENSE file that accompanied this code.
+ *
+ * This code 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
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+/*
+ *
+ *  (C) Copyright IBM Corp. 1999 All Rights Reserved.
+ *  Copyright 1997 The Open Group Research Institute.  All rights reserved.
+ */
+
+package sun.security.krb5.internal;
+
+import sun.security.krb5.Confounder;
+
+public class LocalSeqNumber implements SeqNumber {
+    private int lastSeqNumber;
+
+    public LocalSeqNumber() {
+        randInit();
+    }
+
+    public LocalSeqNumber(int start) {
+        init(start);
+    }
+
+    public LocalSeqNumber(Integer start) {
+        init(start.intValue());
+    }
+
+    public synchronized void randInit() {
+        /*
+         * Sequence numbers fall in the range 0 through 2^32 - 1 and wrap
+         * to zero following the value 2^32 - 1.
+         * Previous implementations used signed sequence numbers.
+         * Workaround implementation incompatibilities by not generating
+         * initial sequence numbers greater than 2^30, as done
+         * in MIT distribution.
+         */
+        // get the random confounder
+        byte[] data = Confounder.bytes(4);
+        data[0] = (byte)(data[0] & 0x3f);
+        int result = ((data[3] & 0xff) |
+                        ((data[2] & 0xff) << 8) |
+                        ((data[1] & 0xff) << 16) |
+                        ((data[0] & 0xff) << 24));
+        if (result == 0) {
+           result = 1;
+        }
+        lastSeqNumber = result;
+    }
+
+    public synchronized void init(int start) {
+        lastSeqNumber = start;
+    }
+
+    public synchronized int current() {
+        return lastSeqNumber;
+    }
+
+    public synchronized int next() {
+        return lastSeqNumber + 1;
+    }
+
+    public synchronized int step() {
+        return ++lastSeqNumber;
+    }
+
+}