package com.javarush.task.task32.task3211;

import javax.xml.bind.DatatypeConverter;
import java.io.ByteArrayOutputStream;
import java.io.ObjectOutputStream;
import java.security.MessageDigest;

/*
Целостность информации
*/

public class Solution {
    public static void main(String... args) throws Exception {
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        ObjectOutputStream oos = new ObjectOutputStream(bos);
        oos.writeObject(new String("test string"));
        oos.flush();
        System.out.println(compareMD5(bos, "5a47d12a2e3f9fecf2d9ba1fd98152eb")); //true
    }

    public static boolean compareMD5(ByteArrayOutputStream byteArrayOutputStream, String md5) throws Exception {

       //1
        byte[] data1 = byteArrayOutputStream.toByteArray(); // getBytes("UTF-8");
        MessageDigest messageDigest = MessageDigest.getInstance("md5");
        byte byteData[] = messageDigest.digest(byteArrayOutputStream.toByteArray());
        String str = DatatypeConverter.printHexBinary( byteData);

        //2
        //byte[] st = DatatypeConverter.parseHexBinary(md5);
        return str.equals(md5.toUpperCase());

    }
}