file_encrypt_decrypt

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# Filename: file_encrypt_decrypt.py
# Version: 1.0.0
# Author: Jeoi Reqi

"""
This script provides functions for encrypting and decrypting files using OpenSSL's AES-256-CBC encryption algorithm
with salt and PBKDF2 key derivation. It also includes checks to create the necessary files if they do not exist.
Additionally, it prompts the user to select a file for encryption or decryption using a file dialog.
"""

import subprocess
import os
from tkinter import filedialog, Tk

def encrypt_file(input_file, output_file):
    """
    Encrypts a file using AES-256-CBC encryption with salt and PBKDF2 key derivation.

    Parameters:
        input_file (str): The path to the input file to be encrypted.
        output_file (str): The path to save the encrypted output file.

    Returns:
        None
    """
    try:
        subprocess.run(['openssl', 'enc', '-aes-256-cbc', '-salt', '-pbkdf2', '-in', input_file, '-out', output_file, '-k', 'password'], check=True)
        print("File encrypted successfully.")
    except subprocess.CalledProcessError:
        print("An error occurred during encryption.")

def decrypt_file(input_file, output_file):
    """
    Decrypts a file encrypted with AES-256-CBC encryption using salt and PBKDF2 key derivation.

    Parameters:
        input_file (str): The path to the encrypted input file to be decrypted.
        output_file (str): The path to save the decrypted output file.

    Returns:
        None
    """
    try:
        subprocess.run(['openssl', 'enc', '-d', '-aes-256-cbc', '-pbkdf2', '-in', input_file, '-out', output_file, '-k', 'password'], check=True)
        print("File decrypted successfully.")
    except subprocess.CalledProcessError:
        print("An error occurred during decryption.")

def select_file():
    """
    Opens a file dialog to select a file for encryption or decryption.

    Returns:
        str: The path to the selected file.
    """
    root = Tk()
    root.withdraw()  # Hide the main window
    file_path = filedialog.askopenfilename()  # Open file dialog
    return file_path

# Example usage:
# Ask user if they want to encrypt or decrypt
operation = input("Enter 'E' to encrypt or 'D' to decrypt: ").upper()

if operation == 'E':
    # Encrypting file
    input_file = select_file()  # Select file using file dialog
    if input_file:
        output_file = input("Enter the filename for the encrypted file (without extension): ") + ".enc"
        encrypt_file(input_file, output_file)
else:
    # Decrypting file
    input_file = select_file()  # Select file using file dialog
    if input_file:
        output_file = input("Enter the filename for the decrypted file (without extension): ")
        decrypt_file(input_file, output_file)