1 /*
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   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
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   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  *
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  23 
  24 /**
  25  * @test
  26  * @bug 4844847
  27  * @summary Test the Mac.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 import javax.crypto.*;
  38 import javax.crypto.spec.*;
  39 
  40 public class ByteBuffers {
  41 
  42     public static void main(String[] args) throws Exception {
  43         Provider p = Security.getProvider("SunJCE");
  44         Random random = new Random();
  45         int n = 10 * 1024;
  46         byte[] t = new byte[n];
  47         random.nextBytes(t);
  48 
  49         byte[] keyBytes = new byte[16];
  50         random.nextBytes(keyBytes);
  51         SecretKey key = new SecretKeySpec(keyBytes, "HmacMD5");
  52 
  53         Mac mac = Mac.getInstance("HmacMD5");
  54         mac.init(key);
  55         byte[] macValue = mac.doFinal(t);
  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(mac, macValue, b2, random);
  65 
  66         // test 2: direct ByteBuffer
  67         ByteBuffer b3 = ByteBuffer.allocateDirect(t.length);
  68         b3.put(t);
  69         b3.clear();
  70         verify(mac, macValue, b3, random);
  71 
  72         // test 3: ByteBuffer without an accessible backing array
  73         b2.clear();
  74         ByteBuffer b4 = b2.asReadOnlyBuffer();
  75         verify(mac, macValue, b4, random);
  76 
  77         System.out.println("All tests passed");
  78     }
  79 
  80     private static void verify(Mac mac, byte[] macValue, ByteBuffer b, Random random) throws Exception {
  81         int lim = b.limit();
  82         b.limit(random.nextInt(lim));
  83         mac.update(b);
  84         if (b.hasRemaining()) {
  85             throw new Exception("Buffer not consumed");
  86         }
  87         b.limit(lim);
  88         mac.update(b);
  89         if (b.hasRemaining()) {
  90             throw new Exception("Buffer not consumed");
  91         }
  92         byte[] newMacValue = mac.doFinal();
  93         if (Arrays.equals(macValue, newMacValue) == false) {
  94             throw new Exception("Mac did not verify");
  95         }
  96     }
  97 }