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package test;

import org.apidesign.api.security.*;

import java.nio.ByteBuffer;

import java.security.MessageDigest;

import java.util.Arrays;

import java.util.Random;

import org.junit.After;

import org.junit.BeforeClass;

import org.junit.Test;

import static org.junit.Assert.*;

/** Compares that the MessageDigest and Digest yield the same results for

 * default provider.

 *

 * @author Jaroslav Tulach <jaroslav.tulach@apidesign.org>

 */

public class OldAPIToNewAPITest {

    private static byte[] arr;

    private static long time;

    private static byte[] resOld;

    private static byte[] resNew;

    public OldAPIToNewAPITest() {

    }

    @BeforeClass

    public static void setUp() {

        time = System.currentTimeMillis();

        Random r = new Random(time);

        arr = new byte[r.nextInt(1024)];

        r.nextBytes(arr);

    }

    @After

    public void tearDown() {

    }

    @Test

    public void generateHashUsingMessageDigest() throws Exception {

        // BEGIN: day.end.bridges.BridgeToOldRegister

        // The java.security.Providers cannot be registered in META-INF/services

        // that is why one needs to either configure various properties or

        // make some dummy call that will initialize our bridge class.

        // Then the bridge class registers itself as a MessageDigest provider

        // in its constructor.

        //

        // This is the call:

        Digest initialize = Digest.getInstance("MD5");

        // END: day.end.bridges.BridgeToOldRegister

        MessageDigest md = MessageDigest.getInstance("cnt");

        byte[] res = md.digest(arr);

        resOld = res;

    }

    @Test

    public void generateHashUsingNewDigest() throws Exception {

        Digest d = Digest.getInstance("cnt");

        ByteBuffer bb = ByteBuffer.wrap(arr);

        byte[] res = d.digest(bb);

        resNew = res;

    }

    @Test

    public void compareTheHashes() throws Exception {

        if (!Arrays.equals(resOld, resNew)) {

            fail("Arrays are different:\n" + Arrays.toString(resOld) + "\n" + Arrays.toString(resNew));

        }

    }

}