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 javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
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();
        Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
        cipher.init(Cipher.DECRYPT_MODE, key);
        CipherInputStream in = new CipherInputStream(new BufferedInputStream(new FileInputStream(f1)), cipher);
        BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(f2));
        int i;
        do {
            i = in.read();
            if (i != -1)
                out.write(i);
        } while (i > 0);
        in.close();
        out.close();
    }
}