package api;

 import java.nio.ByteBuffer;

 import spi.DigestImplementation;

 /** MessageDigest extends MessageDigestSpi, that means the javadoc

  *

  * @author Jaroslav Tulach

  */

 public final class Digest {

     private final DigestImplementation impl;

     /** Factory method is better than constructor */

     private Digest(DigestImplementation impl) {

         this.impl = impl;

     }

     /** Factory method to create digest for an algorithm.

      */

     public static Digest getInstance(String algorithm) {

         return null;

     }

     //

     // these methods are kept the same as in original MessageDigest,

     // but for simplicity choose just some from the original API

     //

     public byte[] digest(ByteBuffer bb) {

         return null;

     }

 }