test/jdk/com/sun/crypto/provider/Mac/LargeByteBufferTest.java

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import java.nio.ByteBuffer;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import javax.crypto.Mac;
import javax.crypto.SecretKey;

/**
 * @test
 * @bug 8048603
 * @summary Checks if PBE algorithms work fine with large buffer
 * @author Alexander Fomin
 * @build Utils
 * @run main LargeByteBufferTest
 */
public class LargeByteBufferTest implements MacTest {

    private static final int BUFFER_SIZE = 65535;

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        Utils.runTests(new LargeByteBufferTest());
    }

    @Override
    public void doTest(String alg) throws NoSuchAlgorithmException,
            InvalidKeyException, NoSuchProviderException {
        SecretKey key = Utils.getSecretKeySpec();

        // instantiate Mac object and init it with a SecretKey
        Mac mac = Mac.getInstance(alg, "SunJCE");
        mac.init(key);

        // prepare buffer
        byte[] data = new byte[BUFFER_SIZE];
        for (int i = 0; i < BUFFER_SIZE; i++) {
            data[i] = (byte) (i % 256);
        }

        ByteBuffer buf = ByteBuffer.wrap(data);
        int limitBefore = buf.limit();

        mac.update(buf);
        mac.doFinal();

        int limitAfter = buf.limit();
        int positonAfter = buf.position();

        if (limitAfter != limitBefore) {
            System.out.println("limit after = " + limitAfter);
            System.out.println("limit before = " + limitBefore);
            throw new RuntimeException("Test failed: "
                    + "limit of buffer has been chenged.");
        }

        if (positonAfter != limitAfter) {
            System.out.println("position after = " + positonAfter);
            System.out.println("limit after = " + limitAfter);
            throw new RuntimeException("Test failed: "
                    + "position of buffer isn't equal to its limit");
        }
    }

}