encryptutils.java

用java写的ftp服务器程序

// $Id: EncryptUtils.java 306725 2005-09-09 16:55:35 +0530 (Fri, 09 Sep 2005) rana_b $
/*
 * Copyright 2004 The Apache Software Foundation
 *
 * 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 org.apache.ftpserver.util;

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

/**
 * String encryption utility methods.
 *
 * @author <a href="mailto:[e-mail]">Rana Bhattacharyya</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) {
            ex.printStackTrace();
        }
        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) {
            ex.printStackTrace();
        }
        return result;
    }
     
}