/*

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  * and open the template in the editor.

  */

 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 {

         // 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");

         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));

         }

     }

 }