Compute the SHA-1 hash of the given byte array

 
import java.nio.ByteBuffer;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/*
 * Java Bittorrent API as its name indicates is a JAVA API that implements the Bittorrent Protocol
 * This project contains two packages:
 * 1. jBittorrentAPI is the "client" part, i.e. it implements all classes needed to publish
 *    files, share them and download them.
 *    This package also contains example classes on how a developer could create new applications.
 * 2. trackerBT is the "tracker" part, i.e. it implements a all classes needed to run
 *    a Bittorrent tracker that coordinates peers exchanges. *
 *
 * Copyright (C) 2007 Baptiste Dubuis, Artificial Intelligence Laboratory, EPFL
 *
 * This file is part of jbittorrentapi-v1.0.zip
 *
 * Java Bittorrent API is free software and a free user study set-up;
 * you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Java Bittorrent API is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Java Bittorrent API; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * @version 1.0
 * @author Baptiste Dubuis
 * To contact the author:
 * email: baptiste.dubuis@gmail.com
 *
 * More information about Java Bittorrent API:
 *    http://sourceforge.net/projects/bitext/
 */

//package atorrentapi;


class Main {
  /**
   * Compute the SHA-1 hash of the given byte array
   * 
   * @param hashThis
   *            byte[]
   * @return byte[]
   */
  public static byte[] hash(byte[] hashThis) {
    try {
      byte[] hash = new byte[20];
      MessageDigest md = MessageDigest.getInstance("SHA-1");

      hash = md.digest(hashThis);
      return hash;
    } catch (NoSuchAlgorithmException nsae) {
      System.err.println("SHA-1 algorithm is not available...");
      System.exit(2);
    }
    return null;
  }


}

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Compute the SHA-1 hash of the given byte array : SHA « Security « Android

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