script.py

#!/usr/bin/python3
import os, os.path
import getpass
import time

from Crypto import Random
from Crypto.Cipher import AES

""" Encrypts and decrypts files. For use with python 3.
    Creates and encrypts data.txt to store password.
    
    Opens file, parse info, overwrite encrypted info to file
    
    Added getpass to avoid clear text passwords"""

#TODO Allow only one password

class Encryptor:
    def __init__(self, key):
        self.key = key

    def pad(self, s):
        return s + b"\0" * (AES.block_size - len(s) % AES.block_size)

    def encrypt(self, message, key):
        message = self.pad(message)
        iv = Random.new().read(AES.block_size)
        cipher = AES.new(key, AES.MODE_CBC, iv)
        return iv + cipher.encrypt(message)

    def encrypt_file(self, file_name):
        with open(file_name, 'rb') as fo:
            plaintext = fo.read()
        enc = self.encrypt(plaintext, self.key)
        with open(file_name + ".enc", 'wb') as fo:
            fo.write(enc)
        os.remove(file_name)

    def decrypt(self, ciphertext, key):
        iv = ciphertext[:AES.block_size]
        cipher = AES.new(key, AES.MODE_CBC, iv)
        plaintext = cipher.decrypt(ciphertext[AES.block_size:])
        return plaintext.rstrip(b"\0")

    def decrypt_file(self, file_name):
        with open(file_name, 'rb') as fo:
            ciphertext = fo.read()
        dec = self.decrypt(ciphertext, self.key)
        with open(file_name[:-4], 'wb') as fo:
            fo.write(dec)
        os.remove(file_name)

    def getAllFiles(self):
        dir_path = os.path.dirname(os.path.realpath(__file__))
        dirs = []
        for dirName, subdirList, fileList in os.walk(dir_path):
            for fname in fileList:
                if (fname != 'script.py' and fname != 'data.txt.enc'):
                    dirs.append(dirName + "\\" + fname)
        return dirs

    def encrypt_all_files(self):
        dirs = self.getAllFiles()
        for file_name in dirs:
            self.encrypt_file(file_name)

    def decrypt_all_files(self):
        dirs = self.getAllFiles()
        for file_name in dirs:
            self.decrypt_file(file_name)



key = b'[EX\xc8\xd5\xbfI{\xa2$\x05(\xd5\x18\xbf\xc0\x85)\x10nc\x94\x02)j\xdf\xcb\xc4\x94\x9d(\x9e'
enc = Encryptor(key)
clear = lambda: os.system('clear')


if os.path.isfile('data.txt.enc'):
    while True:
        password = getpass.getpass("[!] Enter your password: ")
        enc.decrypt_file("data.txt.enc")
        p = ''
        with open("data.txt", "r") as f:
            p = f.readlines()
        if p[0] == password:
            enc.encrypt_file("data.txt")
            break

    while True:
        clear()
        choice = int(input(
            "1. Press '1' to encrypt file.\n2. Press '2' to decrypt file.\n3. Press '3' to Encrypt all files in the "
            "directory.\n4. Press '4' to decrypt all files in the directory.\n5. Press '5' to exit.\n"))
        clear()
        if choice == 1:
            enc.encrypt_file(str(input("Enter name of file to encrypt: ")))
        elif choice == 2:
            enc.decrypt_file(str(input("Enter name of file to decrypt: ")))
        elif choice == 3:
            enc.encrypt_all_files()
        elif choice == 4:
            enc.decrypt_all_files()
        elif choice == 5:
            exit()
        else:
            print("Please select a valid option!")

else:
    while True:
        clear()
        password = getpass.getpass("Setting up stuff. Enter a password that will be used for decryption: ")
        repassword = getpass.getpass("Confirm password: ")
        if password == repassword:
            break
        else:
            print("Passwords Mismatched!")
    f = open("data.txt", "w+")
    f.write(password)
    f.close()
    enc.encrypt_file("data.txt")
    print("The program will restart shortly. Please re-run.")
time.sleep(5)