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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