MessageDigestUtil.java Source code

Introduction

Here is the source code for MessageDigestUtil.java

Source

/*
 * 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";
    }
}