com.appdynamicspilot.util.MD5.java Source code

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Here is the source code for com.appdynamicspilot.util.MD5.java

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/*
 * Copyright 2015 AppDynamics, Inc.
 *
 * 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 com.appdynamicspilot.util;

import java.security.MessageDigest;

import org.springframework.context.ApplicationContextException;

/**
 * Provides MD5 Hashing
 *
 * <p>
 * <b>Example:</b> 
 * <br />
 * <code>
 * &nbsp;&nbsp;String hashedString = MD5.hash("hash me");
 * </code>
 * <br /><br />
 * You can run it from the command line as follows:
 * <br />
 * <code>
 * <b>java</b> com.aurigalogic.crypto.util.MD5 &lt;hash_me&gt;
 * </code>
 * </p>
 * @author <a href="mailto:ngupte@aurigalogic.com">Nikhil Gupte</a>
 * @version $Revision: 11 $ $Date: 2005-10-02 00:57:16 +0530 (Sun, 02 Oct 2005) $ 
 */
public class MD5 {

    /**
     * Returns the hashed value of <code>clear</code>.
     */
    public static String hash(String clear) throws Exception {
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            byte[] b = md.digest(clear.getBytes());

            int size = b.length;
            StringBuffer h = new StringBuffer(size);
            for (int i = 0; i < size; i++) {
                int u = b[i] & 255; // unsigned conversion
                if (u < 16) {
                    h.append("0" + Integer.toHexString(u));
                } else {
                    h.append(Integer.toHexString(u));
                }
            }
            return h.toString();
        } catch (Exception e) {
            throw new Exception(e);
        }
    }

    /**
     * Command line tool to get MD5 hash of strings.
     */
    public static void main(String args[]) {
        try {
        } catch (Exception e) {
            usage();
        }
    }

    /*
     * Outputs usage info. To be used w/ the main method.
     */
    private static void usage() {
    }
}