simple util for sha1 check

Sha1.java

package org.yeshen.utils;

import android.support.annotation.WorkerThread;

import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.security.MessageDigest;

/*********************************************************************
 * This file is part of Download project
 * Created by hello@yeshen.org on 17-1-16.
 * Copyright (c) 2016 yeshen, org. - All Rights Reserved
 *********************************************************************/
public class Sha1 {

    @WorkerThread
    public static boolean checkSha1(String sha1, File file) {
        if (TextUtils.isEmpty(sha1) || file == null || !file.isFile() || !file.exists())
            return false;

        InputStream is = null;
        try {
            MessageDigest digest = MessageDigest.getInstance("SHA-1");
            is = new FileInputStream(file);
            int n = 0;
            byte[] buffer = new byte[8192];
            while (n != -1) {
                n = is.read(buffer);
                if (n > 0) {
                    digest.update(buffer, 0, n);
                }
            }
            byte digestBytes[] = digest.digest();
            StringBuilder hexString = new StringBuilder();
            for (byte aMessageDigest : digestBytes) {
                String shaHex = Integer.toHexString(aMessageDigest & 0xFF);
                if (shaHex.length() < 2) {
                    hexString.append(0);
                }
                hexString.append(shaHex);
            }
            return sha1.equalsIgnoreCase(hexString.toString());
        } catch (IOException | NoSuchAlgorithmException e) {
            e.printStackTrace();
        } finally {
            if (is != null) try {
                is.close();
            } catch (IOException e) {/*ignore*/}
        }
        return false;
    }

}