Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.io.FileInputStream;
import java.io.ObjectInputStream;
import java.security.DigestInputStream;
import java.security.MessageDigest;

public class Main {
    public static void main(String args[]) throws Exception {
        FileInputStream fis = new FileInputStream("test");
        MessageDigest md = MessageDigest.getInstance("SHA");
        DigestInputStream dis = new DigestInputStream(fis, md);
        ObjectInputStream ois = new ObjectInputStream(dis);
        Object o = ois.readObject();
        if (!(o instanceof String)) {
            System.out.println("Unexpected data in file");
            System.exit(-1);
        }
        String data = (String) o;
        System.out.println("Got message " + data);
        dis.on(false);
        o = ois.readObject();
        if (!(o instanceof byte[])) {
            System.out.println("Unexpected data in file");
            System.exit(-1);
        }
        byte origDigest[] = (byte[]) o;
        System.out.println(MessageDigest.isEqual(md.digest(), origDigest));
    }
}