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  */
  30 
  31 import java.util.*;
  32 import java.nio.*;
  33 
  34 import java.security.*;
  35 
  36 public class ByteBuffers {
  37 
  38     public static void main(String[] args) throws Exception {
  39         Provider p = Security.getProvider("SUN");
  40         Random random = new Random();
  41         int n = 10 * 1024;
  42         byte[] t = new byte[n];
  43         random.nextBytes(t);
  44 
  45         KeyPairGenerator kpg = KeyPairGenerator.getInstance("DSA", p);
  46         kpg.initialize(512);
  47         KeyPair kp = kpg.generateKeyPair();
  48 
  49         Signature sig = Signature.getInstance("DSA", p);
  50         sig.initSign(kp.getPrivate());
  51         sig.update(t);
  52         byte[] signature = sig.sign();
  53 
  54         sig.initVerify(kp.getPublic());
  55 
  56         // test 1: ByteBuffer with an accessible backing array
  57         ByteBuffer b1 = ByteBuffer.allocate(n + 256);
  58         b1.position(random.nextInt(256));
  59         b1.limit(b1.position() + n);
  60         ByteBuffer b2 = b1.slice();
  61         b2.put(t);
  62         b2.clear();
  63         verify(sig, signature, b2, random);
  64 
  65         // test 2: direct ByteBuffer
  66         ByteBuffer b3 = ByteBuffer.allocateDirect(t.length);
  67         b3.put(t);
  68         b3.clear();
  69         verify(sig, signature, b3, random);
  70 
  71         // test 3: ByteBuffer without an accessible backing array
  72         b2.clear();
  73         ByteBuffer b4 = b2.asReadOnlyBuffer();
  74         verify(sig, signature, b4, random);
  75 
  76         System.out.println("All tests passed");
  77     }
  78 
  79     private static void verify(Signature sig, byte[] signature, ByteBuffer b, Random random) throws Exception {
  80         int lim = b.limit();
  81         b.limit(random.nextInt(lim));
  82         sig.update(b);
  83         if (b.hasRemaining()) {
  84             throw new Exception("Buffer not consumed");
  85         }
  86         b.limit(lim);
  87         sig.update(b);
  88         if (b.hasRemaining()) {
  89             throw new Exception("Buffer not consumed");
  90         }
  91         if (sig.verify(signature) == false) {
  92             throw new Exception("Signature did not verify");
  93         }
  94     }
  95 }