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*
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* version 2 for more details (a copy is included in the LICENSE file that
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/**
* @test
* @bug 4844847
* @summary Test the MessageDigest.update(ByteBuffer) method
* @author Andreas Sterbenz
*/
import java.util.*;
import java.nio.*;
import java.security.*;
public class ByteBuffers {
public static void main(String[] args) throws Exception {
Provider p = Security.getProvider("SUN");
Random random = new Random();
int n = 10 * 1024;
byte[] t = new byte[n];
random.nextBytes(t);
MessageDigest md = MessageDigest.getInstance("MD5", p);
byte[] d1 = md.digest(t);
// test 1: ByteBuffer with an accessible backing array
ByteBuffer b1 = ByteBuffer.allocate(n + 256);
b1.position(random.nextInt(256));
b1.limit(b1.position() + n);
ByteBuffer b2 = b1.slice();
b2.put(t);
b2.clear();
byte[] d2 = digest(md, b2, random);
if (Arrays.equals(d1, d2) == false) {
throw new Exception("Test 1 failed");
}
// test 2: direct ByteBuffer
ByteBuffer b3 = ByteBuffer.allocateDirect(t.length);
b3.put(t);
b3.clear();
byte[] d3 = digest(md, b3, random);
if (Arrays.equals(d1, d3) == false) {
throw new Exception("Test 2 failed");
}
// test 3: ByteBuffer without an accessible backing array
b2.clear();
ByteBuffer b4 = b2.asReadOnlyBuffer();
byte[] d4 = digest(md, b4, random);
if (Arrays.equals(d1, d4) == false) {
throw new Exception("Test 3 failed");
}
System.out.println("All tests passed");
}
private static byte[] digest(MessageDigest md, ByteBuffer b, Random random) throws Exception {
int lim = b.limit();
b.limit(random.nextInt(lim));
md.update(b);
if (b.hasRemaining()) {
throw new Exception("Buffer not consumed");
}
b.limit(lim);
md.update(b);
if (b.hasRemaining()) {
throw new Exception("Buffer not consumed");
}
return md.digest();
}
}