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+/* Random.java -- SSL Random structure.
+ Copyright (C) 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.net.ssl.provider;
+
+import java.io.PrintWriter;
+import java.io.StringWriter;
+
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+
+/**
+ * An SSL nonce.
+ *
+ * <pre>
+struct
+{
+ uint32 gmt_unix_time;
+ opaque random_bytes[28];
+} Random;
+ */
+public class Random implements Builder, Constructed
+{
+
+ // Fields.
+ // -------------------------------------------------------------------------
+
+ static final int RANDOM_LENGTH = 28;
+
+ private final ByteBuffer buffer;
+
+ // Constructors.
+ // -------------------------------------------------------------------------
+
+ public Random (final ByteBuffer buffer)
+ {
+ this.buffer = buffer.duplicate().order(ByteOrder.BIG_ENDIAN);
+ }
+
+ public Random copy()
+ {
+ ByteBuffer buffer = ByteBuffer.allocate(32);
+ buffer.put((ByteBuffer) this.buffer.duplicate().position(0));
+ return new Random(buffer);
+ }
+
+ public int length()
+ {
+ return RANDOM_LENGTH + 4;
+ }
+
+ public ByteBuffer buffer()
+ {
+ return ((ByteBuffer) buffer.duplicate().position(0).limit(length())).slice();
+ }
+
+ public int gmtUnixTime ()
+ {
+ return buffer.getInt(0);
+ }
+
+ public byte[] randomBytes()
+ {
+ byte[] buf = new byte[28];
+ buffer.position (4);
+ buffer.get (buf);
+ return buf;
+ }
+
+ public void setGmtUnixTime (final int gmtUnixTime)
+ {
+ buffer.putInt (0, gmtUnixTime);
+ }
+
+ public void setRandomBytes (final byte[] randomBytes)
+ {
+ setRandomBytes (randomBytes, 0);
+ }
+
+ public void setRandomBytes (final byte[] randomBytes, final int offset)
+ {
+ if (randomBytes.length - offset < RANDOM_LENGTH)
+ throw new IllegalArgumentException ("random value too short");
+ buffer.position (4);
+ buffer.put (randomBytes, offset, RANDOM_LENGTH);
+ }
+
+ public String toString (final String prefix)
+ {
+ StringWriter str = new StringWriter();
+ PrintWriter out = new PrintWriter(str);
+ if (prefix != null)
+ out.print (prefix);
+ out.println("struct {");
+ if (prefix != null)
+ out.print (prefix);
+ out.print (" gmt_unix_time: ");
+ out.print (gmtUnixTime ());
+ out.println (";");
+ if (prefix != null)
+ out.print (prefix);
+ out.print (" random_bytes: ");
+ out.print (Util.toHexString (randomBytes (), ':'));
+ out.println (";");
+ if (prefix != null)
+ out.print (prefix);
+ out.print ("} Random;");
+ return str.toString();
+ }
+
+ public String toString ()
+ {
+ return toString (null);
+ }
+}