1 /*
   2  * Copyright (c) 1996, 2016, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 
  27 package sun.security.ssl;
  28 
  29 import java.io.*;
  30 import java.security.SecureRandom;
  31 
  32 /*
  33  * RandomCookie ... SSL hands standard format random cookies (nonces)
  34  * around.  These know how to encode/decode themselves on SSL streams,
  35  * and can be created and printed.
  36  *
  37  * @author David Brownell
  38  */
  39 final class RandomCookie {
  40 
  41     byte[] random_bytes;  // exactly 32 bytes
  42 
  43     RandomCookie(SecureRandom generator) {
  44         random_bytes = new byte[32];
  45         generator.nextBytes(random_bytes);
  46     }
  47 
  48     RandomCookie(HandshakeInStream m) throws IOException {
  49         random_bytes = new byte[32];
  50         m.read(random_bytes, 0, 32);
  51     }
  52 
  53     void send(HandshakeOutStream out) throws IOException {
  54         out.write(random_bytes, 0, 32);
  55     }
  56 
  57     void print(PrintStream s) {
  58         s.print("random_bytes = {");
  59         for (int i = 0; i < 32; i++) {
  60             int k = random_bytes[i] & 0xFF;
  61             if (i != 0) {
  62                 s.print(' ');
  63             }
  64             s.print(Utilities.hexDigits[k >>> 4]);
  65             s.print(Utilities.hexDigits[k & 0xf]);
  66         }
  67         s.println("}");
  68     }
  69 }