Source Code : Message Digest Util

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Message Digest Util

       
/*
 * Copyright 2005-2010 the original author or authors.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
//package sdloader.util;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 * ????????????Util
 * 
 * @author shot
 * @author c9katayama
 */
public class MessageDigestUtil {

  protected static String ALGORHTYM = "MD5";

  /**
   * ??????????????????????????
   * 
   * @param planeText
   * @return
   */
  public static String digest(String planeText) {
    MessageDigest digest = createMessageDigest();

    byte[] b = planeText.getBytes();
    String hex = toHexString(digest.digest(b));
    return hex;
  }

  /**
   * byte[]?16??????????
   * 
   * @param buf
   * @return
   */
  public static String toHexString(byte[] buf) {
    String digestText = "";
    for (int i = 0; i < buf.length; i++) {
      int n = buf[i] & 0xff;
      if (n < 16) {
        digestText += "0";
      }
      digestText += Integer.toHexString(n).toUpperCase();
    }
    return digestText;
  }

  /**
   * MessageDisgest???????
   * 
   * @return
   */
  public static MessageDigest createMessageDigest() {
    try {
      return MessageDigest.getInstance(ALGORHTYM);
    } catch (NoSuchAlgorithmException e) {
      throw new ExceptionInInitializerError();
    }
  }

  public static void setAlgorithm(String algorithm) {
    ALGORHTYM = algorithm;
  }

  public static void resetAlgorithm() {
    ALGORHTYM = "MD5";
  }
}

   
    
    
    
    
    
    
  

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