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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

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 * 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,

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/**

 * @test

 * @bug 4844847

 * @summary Test the Cipher.update/doFinal(ByteBuffer, ByteBuffer) methods

 * @author Andreas Sterbenz

 */

import java.util.*;

import java.nio.*;

import java.security.*;

import javax.crypto.*;

import javax.crypto.spec.*;

public class ByteBuffers {

    public static void main(String[] args) throws Exception {

        Provider p = Security.getProvider("SunJCE");

        Random random = new Random();

        int n = 10 * 1024;

        byte[] t = new byte[n];

        random.nextBytes(t);

        byte[] keyBytes = new byte[8];

        random.nextBytes(keyBytes);

        SecretKey key = new SecretKeySpec(keyBytes, "DES");

        Cipher cipher = Cipher.getInstance("DES/ECB/NoPadding");

        cipher.init(Cipher.ENCRYPT_MODE, key);

        byte[] outBytes = cipher.doFinal(t);

        // create ByteBuffers for input (i1, i2, i3) and fill them

        ByteBuffer i0 = ByteBuffer.allocate(n + 256);

        i0.position(random.nextInt(256));

        i0.limit(i0.position() + n);

        ByteBuffer i1 = i0.slice();

        i1.put(t);

        ByteBuffer i2 = ByteBuffer.allocateDirect(t.length);

        i2.put(t);

        i1.clear();

        ByteBuffer i3 = i1.asReadOnlyBuffer();

        ByteBuffer o0 = ByteBuffer.allocate(n + 512);

        o0.position(random.nextInt(256));

        o0.limit(o0.position() + n + 256);

        ByteBuffer o1 = o0.slice();

        ByteBuffer o2 = ByteBuffer.allocateDirect(t.length + 256);

        crypt(cipher, i1, o1, outBytes, random);

        crypt(cipher, i2, o1, outBytes, random);

        crypt(cipher, i3, o1, outBytes, random);

        crypt(cipher, i1, o2, outBytes, random);

        crypt(cipher, i2, o2, outBytes, random);

        crypt(cipher, i3, o2, outBytes, random);

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

    }

    private static void crypt(Cipher cipher, ByteBuffer in, ByteBuffer out, byte[] outBytes, Random random) throws Exception {

        in.clear();

        out.clear();

        out.put(new byte[out.remaining()]);

        out.clear();

        int lim = in.limit();

        in.limit(random.nextInt(lim));

        cipher.update(in, out);

        if (in.hasRemaining()) {

            throw new Exception("Buffer not consumed");

        }

        in.limit(lim);

        cipher.doFinal(in, out);

        if (in.hasRemaining()) {

            throw new Exception("Buffer not consumed");

        }

        out.flip();

        byte[] b = new byte[out.remaining()];

        out.get(b);

        if (Arrays.equals(outBytes, b) == false) {

            throw new Exception("Encryption output mismatch");

        }

    }

}