Android Open Source - Android-Advanced-ImageView Message Digest

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License

The source code is released under:

GNU General Public License

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Java Source Code

/*
 * Copyright (C) 2005 Luca Veltri - University of Parma - Italy
 * /* w  w w. j  av  a  2s.c om*/
 * This file is part of MjSip (http://www.mjsip.org)
 * 
 * MjSip 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 2 of the License, or
 * (at your option) any later version.
 * 
 * MjSip 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 MjSip; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 * 
 * Author(s):
 * Luca Veltri (luca.veltri@unipr.it)
 */

package com.appsdk.advancedimageview.util;

/**
 * Generic hash/message-digest algorithm.
 */
public abstract class MessageDigest {
  /**
   * MessageDigest block update operation. Continues a message-digest
   * operation, processing another message block, and updating the context.
   */
  abstract public MessageDigest update(byte[] buffer, int offset, int len);

  /**
   * MessageDigest block update operation. Continues a message-digest
   * operation, processing another message block, and updating the context.
   */
  public MessageDigest update(String str) {
    byte[] buf = str.getBytes();
    return update(buf, 0, buf.length);
  }

  /**
   * MessageDigest block update operation. Continues a message-digest
   * operation, processing another message block, and updating the context.
   */
  public MessageDigest update(byte[] buffer) {
    return update(buffer, 0, buffer.length);
  }

  /**
   * MessageDigest finalization. Ends a message-digest operation, writing the
   * the message digest and zeroizing the context.
   */
  abstract public byte[] doFinal();

  /** Gets the MessageDigest. The same as doFinal(). */
  public byte[] getDigest() {
    return doFinal();
  }

  /** Gets the Message Digest as string of hex values. */
  public String asHex() {
    return asHex(doFinal());
  }

  /** Transforms an array of bytes into a string of hex values. */
  public static String asHex(byte[] buf) {
    String str = new String();
    for (int i = 0; i < buf.length; i++) {
      str += Integer.toHexString((buf[i] >>> 4) & 0x0F);
      str += Integer.toHexString(buf[i] & 0x0F);
    }
    return str;
  }

}

Java Source Code List