如何在Java游戏中检查MD5资源的哈希值是否正确？

Question

I am developing a Java game and I want to verify that the resources are not different from the ones I included. Can I do this by checking the MD5 hash and if I can how? Any help is appreciated, thank you.

Answer 1

The code to get MD5 was found here :. I just modified to accept the path to resource and read the bytes of that resource into a byte array which is then passed to the MD5 algorithm

import java.nio.file.Files;
import java.nio.file.Paths;
import java.nio.file.Path;
import java.io.FileInputStream;
import java.io.UnsupportedEncodingException;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

    public static String getMD5(String pathToResource) {
            Path path = Paths.get(pathToResource);
            byte[] data = Files.readAllBytes(path);
            try {
                MessageDigest md = MessageDigest.getInstance("MD5");
                byte[] messageDigest = md.digest(data);
                BigInteger number = new BigInteger(1, messageDigest);
                String hashtext = number.toString(16);
                // Now we need to zero pad it if you actually want the full 32 chars.
                while (hashtext.length() < 32) {
                    hashtext = "0" + hashtext;
                }
                return hashtext;
            }
            catch (NoSuchAlgorithmException e) {
                throw new RuntimeException(e);
            }
        }