Impressum ByteBuffers.java Sprache: JAVA

/*
* Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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*/

/**
* @test
* @bug 4844847
* @summary Test the Signature.update(ByteBuffer) method
* @author Andreas Sterbenz
* @key randomness
*/

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);

        KeyPairGenerator kpg = KeyPairGenerator.getInstance("DSA", p);
        kpg.initialize(512);
        KeyPair kp = kpg.generateKeyPair();

        Signature sig = Signature.getInstance("DSA", p);
        sig.initSign(kp.getPrivate());
        sig.update(t);
        byte[] signature = sig.sign();

        sig.initVerify(kp.getPublic());

        // 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();
        verify(sig, signature, b2, random);

        // test 2: direct ByteBuffer
        ByteBuffer b3 = ByteBuffer.allocateDirect(t.length);
        b3.put(t);
        b3.clear();
        verify(sig, signature, b3, random);

        // test 3: ByteBuffer without an accessible backing array
        b2.clear();
        ByteBuffer b4 = b2.asReadOnlyBuffer();
        verify(sig, signature, b4, random);

        System.out.println("All tests passed");
    }

    private static void verify(Signature sig, byte[] signature, ByteBuffer b, Random random) throws Exception {
        int lim = b.limit();
        b.limit(random.nextInt(lim));
        sig.update(b);
        if (b.hasRemaining()) {
            throw new Exception("Buffer not consumed");
        }
        b.limit(lim);
        sig.update(b);
        if (b.hasRemaining()) {
            throw new Exception("Buffer not consumed");
        }
        if (sig.verify(signature) == false) {
            throw new Exception("Signature did not verify");
        }
    }
}

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