MainClass.java Source code

Introduction

Here is the source code for MainClass.java

Source

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

import javax.crypto.Cipher;
import javax.crypto.CipherOutputStream;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;

public class MainClass {
    public static void main(String[] args) throws Exception {
        desEncrypt("plaintextfile", "ciphertextfile");
    }

    public static void desEncrypt(String f1, String f2) throws Exception {
        SecretKey key = null;
        ObjectInputStream keyFile = new ObjectInputStream(new FileInputStream("DESKey.ser"));
        key = (SecretKey) keyFile.readObject();
        keyFile.close();

        KeyGenerator keygen = KeyGenerator.getInstance("DES");
        key = keygen.generateKey();
        ObjectOutputStream keyFileout = new ObjectOutputStream(new FileOutputStream("DESKey.ser"));
        keyFileout.writeObject(key);
        keyFileout.close();
        Cipher cipher = null;
        cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, key);
        BufferedInputStream in = new BufferedInputStream(new FileInputStream(f1));

        CipherOutputStream out = new CipherOutputStream(new BufferedOutputStream(new FileOutputStream(f2)), cipher);
        int i;
        do {
            i = in.read();
            if (i != -1)
                out.write(i);
        } while (i != -1);
        in.close();
        out.close();
    }
}