MainClass.java Source code

Introduction

Here is the source code for MainClass.java

Source

import java.io.FileOutputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.security.SecureRandom;

import javax.crypto.Cipher;
import javax.crypto.CipherOutputStream;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;

public class MainClass {
    public static void main(String args[]) throws Exception {
        KeyGenerator kg = KeyGenerator.getInstance("DES");
        kg.init(new SecureRandom());
        SecretKey key = kg.generateKey();
        SecretKeyFactory skf = SecretKeyFactory.getInstance("DES");
        Class spec = Class.forName("javax.crypto.spec.DESKeySpec");
        DESKeySpec ks = (DESKeySpec) skf.getKeySpec(key, spec);
        ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("keyfile"));
        oos.writeObject(ks.getKey());

        Cipher c = Cipher.getInstance("DES/CFB8/NoPadding");
        c.init(Cipher.ENCRYPT_MODE, key);
        CipherOutputStream cos = new CipherOutputStream(new FileOutputStream("ciphertext"), c);
        PrintWriter pw = new PrintWriter(new OutputStreamWriter(cos));
        pw.println("Stand and unfold yourself");
        pw.close();
        oos.writeObject(c.getIV());
        oos.close();
    }
}