| /* |
| * Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /** |
| * @test |
| * @bug 4844847 |
| * @summary Test the MessageDigest.update(ByteBuffer) method |
| * @author Andreas Sterbenz |
| * @key randomness |
| */ |
| |
| import java.util.*; |
| import java.nio.*; |
| |
| import java.security.*; |
| |
| public class ByteBuffers { |
| |
| public static void main(String[] args) throws Exception { |
| Provider p = Security.getProvider("SUN"); |
| Random random = new Random(); |
| int n = 10 * 1024; |
| byte[] t = new byte[n]; |
| random.nextBytes(t); |
| |
| MessageDigest md = MessageDigest.getInstance("MD5", p); |
| byte[] d1 = md.digest(t); |
| |
| // test 1: ByteBuffer with an accessible backing array |
| ByteBuffer b1 = ByteBuffer.allocate(n + 256); |
| b1.position(random.nextInt(256)); |
| b1.limit(b1.position() + n); |
| ByteBuffer b2 = b1.slice(); |
| b2.put(t); |
| b2.clear(); |
| byte[] d2 = digest(md, b2, random); |
| if (Arrays.equals(d1, d2) == false) { |
| throw new Exception("Test 1 failed"); |
| } |
| |
| // test 2: direct ByteBuffer |
| ByteBuffer b3 = ByteBuffer.allocateDirect(t.length); |
| b3.put(t); |
| b3.clear(); |
| byte[] d3 = digest(md, b3, random); |
| if (Arrays.equals(d1, d3) == false) { |
| throw new Exception("Test 2 failed"); |
| } |
| |
| // test 3: ByteBuffer without an accessible backing array |
| b2.clear(); |
| ByteBuffer b4 = b2.asReadOnlyBuffer(); |
| byte[] d4 = digest(md, b4, random); |
| if (Arrays.equals(d1, d4) == false) { |
| throw new Exception("Test 3 failed"); |
| } |
| System.out.println("All tests passed"); |
| } |
| |
| private static byte[] digest(MessageDigest md, ByteBuffer b, Random random) throws Exception { |
| int lim = b.limit(); |
| b.limit(random.nextInt(lim)); |
| md.update(b); |
| if (b.hasRemaining()) { |
| throw new Exception("Buffer not consumed"); |
| } |
| b.limit(lim); |
| md.update(b); |
| if (b.hasRemaining()) { |
| throw new Exception("Buffer not consumed"); |
| } |
| return md.digest(); |
| } |
| } |