MainClass.java Source code

Introduction

Here is the source code for MainClass.java

Source

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.io.ObjectInputStream;

import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;

public class MainClass {
    public static void main(String args[]) throws Exception {
        ObjectInputStream ois = new ObjectInputStream(new FileInputStream("keyfile"));
        DESKeySpec ks = new DESKeySpec((byte[]) ois.readObject());
        SecretKeyFactory skf = SecretKeyFactory.getInstance("DES");
        SecretKey key = skf.generateSecret(ks);

        Cipher c = Cipher.getInstance("DES/CFB8/NoPadding");
        c.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec((byte[]) ois.readObject()));
        CipherInputStream cis = new CipherInputStream(new FileInputStream("ciphertext"), c);
        BufferedReader br = new BufferedReader(new InputStreamReader(cis));
        System.out.println(br.readLine());
    }
}