1 /* 2 * Copyright (c) 2003, 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. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /** 25 * @test 26 * @bug 4844847 27 * @summary Test the MessageDigest.update(ByteBuffer) method 28 * @author Andreas Sterbenz 29 * @key randomness 30 */ 31 32 import java.util.*; 33 import java.nio.*; 34 35 import java.security.*; 36 37 public class ByteBuffers { 38 39 public static void main(String[] args) throws Exception { 40 Provider p = Security.getProvider("SUN"); 41 Random random = new Random(); 42 int n = 10 * 1024; 43 byte[] t = new byte[n]; 44 random.nextBytes(t); 45 46 MessageDigest md = MessageDigest.getInstance("MD5", p); 47 byte[] d1 = md.digest(t); 48 49 // test 1: ByteBuffer with an accessible backing array 50 ByteBuffer b1 = ByteBuffer.allocate(n + 256); 51 b1.position(random.nextInt(256)); 52 b1.limit(b1.position() + n); 53 ByteBuffer b2 = b1.slice(); 54 b2.put(t); 55 b2.clear(); 56 byte[] d2 = digest(md, b2, random); 57 if (Arrays.equals(d1, d2) == false) { 58 throw new Exception("Test 1 failed"); 59 } 60 61 // test 2: direct ByteBuffer 62 ByteBuffer b3 = ByteBuffer.allocateDirect(t.length); 63 b3.put(t); 64 b3.clear(); 65 byte[] d3 = digest(md, b3, random); 66 if (Arrays.equals(d1, d3) == false) { 67 throw new Exception("Test 2 failed"); 68 } 69 70 // test 3: ByteBuffer without an accessible backing array 71 b2.clear(); 72 ByteBuffer b4 = b2.asReadOnlyBuffer(); 73 byte[] d4 = digest(md, b4, random); 74 if (Arrays.equals(d1, d4) == false) { 75 throw new Exception("Test 3 failed"); 76 } 77 System.out.println("All tests passed"); 78 } 79 80 private static byte[] digest(MessageDigest md, ByteBuffer b, Random random) throws Exception { 81 int lim = b.limit(); 82 b.limit(random.nextInt(lim)); 83 md.update(b); 84 if (b.hasRemaining()) { 85 throw new Exception("Buffer not consumed"); 86 } 87 b.limit(lim); 88 md.update(b); 89 if (b.hasRemaining()) { 90 throw new Exception("Buffer not consumed"); 91 } 92 return md.digest(); 93 } 94 }