simple util method for md5

Md5Util.java

package org.yeshen.download;

import android.support.annotation.WorkerThread;
import android.text.TextUtils;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/*********************************************************************
 * This file is part of Download project
 * Created by hello@yeshen.org on 2019/02/28.
 * Copyright (c) 2019 yeshen, org. - All Rights Reserved
 *********************************************************************/

public class Md5Util {

    @WorkerThread
    public static boolean check(File file, String md5) {
        if (TextUtils.isEmpty(md5)) return false;
        String calculatedDigest = calculate(file);
        return md5.equalsIgnoreCase(calculatedDigest);
    }

    @WorkerThread
    private static String calculate(File updateFile) {
        if (updateFile == null || !updateFile.exists() || !updateFile.isFile()) return "";
        byte[] buffer = new byte[8192];
        InputStream is = null;
        int read;
        try {
            MessageDigest digest = MessageDigest.getInstance("MD5");
            is = new FileInputStream(updateFile);
            while ((read = is.read(buffer)) > 0) {
                digest.update(buffer, 0, read);
            }
            String output = new BigInteger(1, digest.digest()).toString(16);
            output = String.format("%32s", output).replace(' ', '0');
            return output;
        } catch (IOException e) {
            e.printStackTrace();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } finally {
            if (is != null) try {
                is.close();
            } catch (IOException e) {/*ignore,we have try out best*/}
        }
        return "";
    }
}