1 /* 2 * Copyright (c) 1996, 2007, 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 RandomCookie(SecureRandom generator)43 RandomCookie(SecureRandom generator) { 44 long temp = System.currentTimeMillis() / 1000; 45 int gmt_unix_time; 46 if (temp < Integer.MAX_VALUE) { 47 gmt_unix_time = (int) temp; 48 } else { 49 gmt_unix_time = Integer.MAX_VALUE; // Whoops! 50 } 51 52 random_bytes = new byte[32]; 53 generator.nextBytes(random_bytes); 54 55 random_bytes[0] = (byte)(gmt_unix_time >> 24); 56 random_bytes[1] = (byte)(gmt_unix_time >> 16); 57 random_bytes[2] = (byte)(gmt_unix_time >> 8); 58 random_bytes[3] = (byte)gmt_unix_time; 59 } 60 RandomCookie(HandshakeInStream m)61 RandomCookie(HandshakeInStream m) throws IOException { 62 random_bytes = new byte[32]; 63 m.read(random_bytes, 0, 32); 64 } 65 send(HandshakeOutStream out)66 void send(HandshakeOutStream out) throws IOException { 67 out.write(random_bytes, 0, 32); 68 } 69 print(PrintStream s)70 void print(PrintStream s) { 71 int i, gmt_unix_time; 72 73 gmt_unix_time = random_bytes[0] << 24; 74 gmt_unix_time += random_bytes[1] << 16; 75 gmt_unix_time += random_bytes[2] << 8; 76 gmt_unix_time += random_bytes[3]; 77 78 s.print("GMT: " + gmt_unix_time + " "); 79 s.print("bytes = { "); 80 81 for (i = 4; i < 32; i++) { 82 if (i != 4) { 83 s.print(", "); 84 } 85 s.print(random_bytes[i] & 0x0ff); 86 } 87 s.println(" }"); 88 } 89 } 90