ByteBuffers.java

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 * version 2 for more details (a copy is included in the LICENSE file that
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 * 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
 * @key randomness
 */

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");
        }
    }
}