1 /* 2 * Copyright (c) 1997, 2006, 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 /** 28 * ByteArrayTagOrder: a class for comparing two DER encodings by the 29 * order of their tags. 30 * 31 * @author D. N. Hoover 32 */ 33 34 package sun.security.util; 35 36 import java.util.Comparator; 37 38 public class ByteArrayTagOrder implements Comparator<byte[]> { 39 40 /** 41 * Compare two byte arrays, by the order of their tags, 42 * as defined in ITU-T X.680, sec. 6.4. (First compare 43 * tag classes, then tag numbers, ignoring the constructivity bit.) 44 * 45 * @param bytes1 first byte array to compare. 46 * @param bytes2 second byte array to compare. 47 * @return negative number if bytes1 < bytes2, 0 if bytes1 == bytes2, 48 * positive number if bytes1 > bytes2. 49 * 50 * @exception <code>ClassCastException</code> 51 * if either argument is not a byte array. 52 */ 53 compare(byte[] bytes1, byte[] bytes2)54 public final int compare(byte[] bytes1, byte[] bytes2) { 55 // tag order is same as byte order ignoring any difference in 56 // the constructivity bit (0x02) 57 return (bytes1[0] | 0x20) - (bytes2[0] | 0x20); 58 } 59 60 61 } 62