Java加密工具类

/* * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements.  See the NOTICE file * distributed with this work for additional information * regarding copyright ownership.  The ASF licenses this file * to you 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 org.apache.ftpserver.util;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;/** * <strong>Internal class, do not use directly.</strong> *  * String encryption utility methods. * * @author <a href="http://mina.apache.org">Apache MINA Project</a> */public class EncryptUtils {    /**     * Encrypt byte array.     */    public final static byte[] encrypt(byte[] source, String algorithm)            throws NoSuchAlgorithmException {        MessageDigest md = MessageDigest.getInstance(algorithm);        md.reset();        md.update(source);        return md.digest();    }    /**     * Encrypt string     */    public final static String encrypt(String source, String algorithm)            throws NoSuchAlgorithmException {        byte[] resByteArray = encrypt(source.getBytes(), algorithm);        return StringUtils.toHexString(resByteArray);    }    /**     * Encrypt string using MD5 algorithm     */    public final static String encryptMD5(String source) {        if (source == null) {            source = "";        }        String result = "";        try {            result = encrypt(source, "MD5");        } catch (NoSuchAlgorithmException ex) {            // this should never happen            throw new RuntimeException(ex);        }        return result;    }    /**     * Encrypt string using SHA algorithm     */    public final static String encryptSHA(String source) {        if (source == null) {            source = "";        }        String result = "";        try {            result = encrypt(source, "SHA");        } catch (NoSuchAlgorithmException ex) {            // this should never happen            throw new RuntimeException(ex);        }        return result;    }}