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 }