Android Open Source - android_retrieval_system M D5 Checksum

From Project

Back to project page android_retrieval_system.

License

The source code is released under:

GNU General Public License

If you think the Android project android_retrieval_system listed in this page is inappropriate, such as containing malicious code/tools or violating the copyright, please email info at java2s dot com, thanks.

Java Source Code

/*
 * This file is part of Android retrieval system project.
 * /*ww w. j  a v  a 2s  .c o  m*/
 * Android retrieval system is free software: 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 3 of the License,
 * or (at your option) any later version. 
 * 
 * Android retrieval system 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 Android retrieval system. If not, see <http://www.gnu.org/licenses/>.
 */

package net.deerhunter.ars.utils;

import java.io.*;
import java.security.MessageDigest;

/**
 * This class is used to generate an MD5 checksum.
 * 
 * @author DeerHunter (vityokkv73@gmail.com)
 */
public class MD5Checksum {
  private MD5Checksum() {}

  /**
   * Method generates an MD5 checksum byte array for the given
   * <code>String</code> parameter.
   * 
   * @param text Text the MD5 checksum will be generated for
   * @return Byte array that represents the MD5 checksum
   * @throws Exception if some problems with IO stream is happened
   */
  public static byte[] createChecksum(String text) throws Exception {
    InputStream fis = new FileInputStream(text);

    byte[] buffer = new byte[1024];
    MessageDigest complete = MessageDigest.getInstance("MD5");
    int numRead;

    do {
      numRead = fis.read(buffer);
      if (numRead > 0) {
        complete.update(buffer, 0, numRead);
      }
    } while (numRead != -1);

    fis.close();
    return complete.digest();
  }

  /**
   * Method generates an MD5 checksum string for the given <code>String</code>
   * parameter.
   * 
   * @param text Text the MD5 checksum will be generated for
   * @return String that represents the MD5 checksum
   * @throws Exception if some problems with IO stream is happened
   */
  public static String getMD5Checksum(String text) throws Exception {
    byte[] b = createChecksum(text);
    String result = "";

    for (int i = 0; i < b.length; i++) {
      result += Integer.toString((b[i] & 0xff) + 0x100, 16).substring(1);
    }
    return result;
  }
}

Java Source Code List