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 Signature.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 KeyPairGenerator kpg = KeyPairGenerator.getInstance("DSA", p); 47 kpg.initialize(512); 48 KeyPair kp = kpg.generateKeyPair(); 49 50 Signature sig = Signature.getInstance("DSA", p); 51 sig.initSign(kp.getPrivate()); 52 sig.update(t); 53 byte[] signature = sig.sign(); 54 55 sig.initVerify(kp.getPublic()); 56 57 // test 1: ByteBuffer with an accessible backing array 58 ByteBuffer b1 = ByteBuffer.allocate(n + 256); 59 b1.position(random.nextInt(256)); 60 b1.limit(b1.position() + n); 61 ByteBuffer b2 = b1.slice(); 62 b2.put(t); 63 b2.clear(); 64 verify(sig, signature, b2, random); 65 66 // test 2: direct ByteBuffer 67 ByteBuffer b3 = ByteBuffer.allocateDirect(t.length); 68 b3.put(t); 69 b3.clear(); 70 verify(sig, signature, b3, random); 71 72 // test 3: ByteBuffer without an accessible backing array 73 b2.clear(); 74 ByteBuffer b4 = b2.asReadOnlyBuffer(); 75 verify(sig, signature, b4, random); 76 77 System.out.println("All tests passed"); 78 } 79 80 private static void verify(Signature sig, byte[] signature, ByteBuffer b, Random random) throws Exception { 81 int lim = b.limit(); 82 b.limit(random.nextInt(lim)); 83 sig.update(b); 84 if (b.hasRemaining()) { 85 throw new Exception("Buffer not consumed"); 86 } 87 b.limit(lim); 88 sig.update(b); 89 if (b.hasRemaining()) { 90 throw new Exception("Buffer not consumed"); 91 } 92 if (sig.verify(signature) == false) { 93 throw new Exception("Signature did not verify"); 94 } 95 } 96 }