MainClass.java Source code

Introduction

Here is the source code for MainClass.java

Source

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

public class MainClass {
    public static void main(String args[]) throws Exception {
        FileInputStream fis = new FileInputStream("test");
        ObjectInputStream ois = new ObjectInputStream(fis);
        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);
        o = ois.readObject();
        if (!(o instanceof byte[])) {
            System.out.println("Unexpected data in file");
            System.exit(-1);
        }
        byte origDigest[] = (byte[]) o;
        byte pass[] = "aaa".getBytes();
        byte buf[] = data.getBytes();
        MessageDigest md = MessageDigest.getInstance("SHA");
        md.update(pass);
        md.update(buf);
        byte digest1[] = md.digest();
        md.update(pass);
        md.update(digest1);
        System.out.println(MessageDigest.isEqual(md.digest(), origDigest));
    }
}