jdk/test/sun/security/pkcs11/MessageDigest/ByteBuffers.java
author duke
Sat, 01 Dec 2007 00:00:00 +0000
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/*
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 * Copyright 2003 Sun Microsystems, Inc.  All Rights Reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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 * CA 95054 USA or visit www.sun.com if you need additional information or
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 * have any questions.
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 */
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/**
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 * @test
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 * @bug 4856966
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 * @summary Test the MessageDigest.update(ByteBuffer) method
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 * @author Andreas Sterbenz
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 * @library ..
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 */
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import java.util.*;
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import java.nio.*;
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import java.security.*;
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public class ByteBuffers extends PKCS11Test {
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    public static void main(String[] args) throws Exception {
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        main(new ByteBuffers());
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    }
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    public void main(Provider p) throws Exception {
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        if (p.getService("MessageDigest", "MD5") == null) {
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            System.out.println("Provider does not support MD5, skipping");
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            return;
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        }
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        Random random = new Random();
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        int n = 10 * 1024;
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        byte[] t = new byte[n];
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        random.nextBytes(t);
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        MessageDigest md = MessageDigest.getInstance("MD5", p);
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        byte[] d1 = md.digest(t);
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        // test 1: ByteBuffer with an accessible backing array
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        ByteBuffer b1 = ByteBuffer.allocate(n + 256);
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        b1.position(random.nextInt(256));
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        b1.limit(b1.position() + n);
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        ByteBuffer b2 = b1.slice();
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        b2.put(t);
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        b2.clear();
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        byte[] d2 = digest(md, b2, random);
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        if (Arrays.equals(d1, d2) == false) {
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            throw new Exception("Test 1 failed");
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        }
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        // test 2: direct ByteBuffer
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        ByteBuffer b3 = ByteBuffer.allocateDirect(t.length);
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        b3.put(t);
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        b3.clear();
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        byte[] d3 = digest(md, b3, random);
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        if (Arrays.equals(d1, d2) == false) {
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            throw new Exception("Test 2 failed");
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        }
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        // test 3: ByteBuffer without an accessible backing array
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        b2.clear();
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        ByteBuffer b4 = b2.asReadOnlyBuffer();
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        byte[] d4 = digest(md, b4, random);
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        if (Arrays.equals(d1, d2) == false) {
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            throw new Exception("Test 3 failed");
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        }
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        System.out.println("All tests passed");
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    }
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    private static byte[] digest(MessageDigest md, ByteBuffer b, Random random) throws Exception {
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        int lim = b.limit();
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        b.limit(random.nextInt(lim));
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        md.update(b);
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        if (b.hasRemaining()) {
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            throw new Exception("Buffer not consumed");
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        }
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        b.limit(lim);
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        md.update(b);
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        if (b.hasRemaining()) {
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            throw new Exception("Buffer not consumed");
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        }
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        return md.digest();
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    }
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}