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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 
main(String[] args)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 
verify(Mac mac, byte[] macValue, ByteBuffer b, Random random)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 }
98