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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  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).
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  23 
  24 /**
  25  * @test
  26  * @bug 4844847
  27  * @summary Test the Mac.update(ByteBuffer) method
  28  * @author Andreas Sterbenz
  29  */
  30 
  31 import java.util.*;
  32 import java.nio.*;
  33 
  34 import java.security.*;
  35 
  36 import javax.crypto.*;
  37 import javax.crypto.spec.*;
  38 
  39 public class ByteBuffers {
  40 
  41     public static void main(String[] args) throws Exception {
  42         Provider p = Security.getProvider("SunJCE");
  43         Random random = new Random();
  44         int n = 10 * 1024;
  45         byte[] t = new byte[n];
  46         random.nextBytes(t);
  47 
  48         byte[] keyBytes = new byte[16];
  49         random.nextBytes(keyBytes);
  50         SecretKey key = new SecretKeySpec(keyBytes, "HmacMD5");
  51 
  52         Mac mac = Mac.getInstance("HmacMD5");
  53         mac.init(key);
  54         byte[] macValue = mac.doFinal(t);
  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(mac, macValue, b2, random);
  64 
  65         // test 2: direct ByteBuffer
  66         ByteBuffer b3 = ByteBuffer.allocateDirect(t.length);
  67         b3.put(t);
  68         b3.clear();
  69         verify(mac, macValue, b3, random);
  70 
  71         // test 3: ByteBuffer without an accessible backing array
  72         b2.clear();
  73         ByteBuffer b4 = b2.asReadOnlyBuffer();
  74         verify(mac, macValue, b4, random);
  75 
  76         System.out.println("All tests passed");
  77     }
  78 
  79     private static void verify(Mac mac, byte[] macValue, ByteBuffer b, Random random) throws Exception {
  80         int lim = b.limit();
  81         b.limit(random.nextInt(lim));
  82         mac.update(b);
  83         if (b.hasRemaining()) {
  84             throw new Exception("Buffer not consumed");
  85         }
  86         b.limit(lim);
  87         mac.update(b);
  88         if (b.hasRemaining()) {
  89             throw new Exception("Buffer not consumed");
  90         }
  91         byte[] newMacValue = mac.doFinal();
  92         if (Arrays.equals(macValue, newMacValue) == false) {
  93             throw new Exception("Mac did not verify");
  94         }
  95     }
  96 }