com.algodefu.yeti.md5.MD5HashGenerator.java Source code

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Here is the source code for com.algodefu.yeti.md5.MD5HashGenerator.java

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/*
 * Copyright 2014 Algodefu
 *
 * 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.algodefu.yeti.md5;

import org.apache.commons.lang3.SerializationUtils;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class MD5HashGenerator {

    public static String generateKeyByObject(Object object) {
        MessageDigest m = null;
        try {
            m = MessageDigest.getInstance("MD5");
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        m.reset();
        //m.update(objectToByteArray(object));
        m.update(SerializationUtils.serialize((Serializable) object));
        byte[] digest = m.digest();
        BigInteger bigInt = new BigInteger(1, digest);
        String hashtext = bigInt.toString(16);
        while (hashtext.length() < 32) {
            hashtext = "0" + hashtext;
        }
        return hashtext;
    }

    public static String generateKeyByString(String string) {
        MessageDigest m = null;
        try {
            m = MessageDigest.getInstance("MD5");
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        m.reset();
        m.update(string.getBytes());
        byte[] digest = m.digest();
        BigInteger bigInt = new BigInteger(1, digest);
        String hashtext = bigInt.toString(16);
        while (hashtext.length() < 32) {
            hashtext = "0" + hashtext;
        }
        return hashtext;
    }

    private static byte[] objectToByteArray(Object obj) {

        ByteArrayOutputStream b = new ByteArrayOutputStream();
        ObjectOutputStream o = null;
        try {
            o = new ObjectOutputStream(b);
            o.writeObject(obj);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return b.toByteArray();
    }
}