Изучаю Python.
Подскажите что за кусок кода?
from Crypto.Cipher import crypto
import os
import codecs
import binascii
import hashlib
# Инициализация
PADDING = "{"
# Инициализация для генерации ключа
KEY = None
def _padding(message):
"""Проверка длины"""
remainder = len(message) % 16
if remainder == 0:
return message
else:
return ''.join([message, PADDING * (16 - remainder)])
def _split_message(message, block_size):
# Исключение
num_of_blocks = int(len(message) / block_size)
message_in_blocks = [message[i * block_size:(i + 1) * block_size] for i in range(num_of_blocks)]
return message_in_blocks
def encrypt(key, message):
# Преобразование
message = _padding(message)
message_blocks = _split_message(message, 16)
IV = os.urandom(16)
encrypter = crypto.new(key, AES.MODE_CBC, IV)
ciphertext_blocks = [encrypter.encrypt(message_block) for message_block in message_blocks]
ciphertext_blocks_in_hex = [(codecs.encode(IV, 'hex_codec')).decode("utf-8")] + \
[(codecs.encode(ciphertext_block, 'hex_codec')).decode("utf-8")
for ciphertext_block in ciphertext_blocks]
ciphertext = ''.join(ciphertext_blocks_in_hex)
return ciphertext
def decrypt(key, ciphertext):
ciphertext_blocks_in_hex = _split_message(ciphertext, 32)
ciphertext_blocks = [binascii.unhexlify(ciphertext_block) for ciphertext_block in ciphertext_blocks_in_hex]
IV = ciphertext_blocks[0]
decrypter = crypto.new(key, AES.MODE_CBC, IV)
ciphertext_blocks = ciphertext_blocks[1:]
message_blocks = [(decrypter.decrypt(ciphertext_block)).decode("utf-8") for ciphertext_block in ciphertext_blocks]
message = ''.join(message_blocks)
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from PyQt5.QtGui import *
from PyQt5.QtCore import *
from UI import CryptoMainWindow_ui, CryptoPasswordDialog_ui
import crypto
import sys
class CryptoMainWindow(QMainWindow, CryptoMainWindow_ui.Ui_main_window):
"""Определяем атрибуты и методы"""
def __init__(self):
QMainWindow.__init__(self)
self.setupUi(self)
# Обработчики событий
self.button_encrypt.clicked.connect(self.encrypt_text)
self.button_decrypt.clicked.connect(self.decrypt_text)
self.line_edit_main_window.returnPressed.connect(self.encrypt_text)
self.line_edit_main_window.textEdited.connect(self.edit_characters_left_label)
self.action_clear_chat.triggered.connect(self.clear_chat)
self.action_generate_AES_key.triggered.connect(self.generate_new_key)
self.setFocus()
def encrypt_text(self):
"""Обработчик метода шифрования в пуше"""
message = self.line_edit_main_window.text()
# Проверка
if message and not message.isspace():
ciphertext = crypto_.encrypt(crypto_.KEY, message)
self.text_edit.append("<b>Encrypted:</b> {0}".format(ciphertext))
self.line_edit_main_window.clear()
self.edit_characters_left_label()
def decrypt_text(self):
"""Проверяем ключ пользователя"""
# Если длина ключа не соответствует
ciphertext = self.line_edit_main_window.text()
# Проверка передачи ключа пользователя
if ciphertext and not ciphertext.isspace():
message = crypto_.decrypt(crypto_.KEY, ciphertext)
self.text_edit.append("<b>Decrypted:</b> {0}".format(message))
self.line_edit_main_window.clear()
self.edit_characters_left_label()
def edit_characters_left_label(self):
# Максимальное кол-во символов
max_num_of_characters = 320
num_of_characters_left = max_num_of_characters - len(self.line_edit_main_window.text())
self.label_characters_left.setText("{0} characters left".format(num_of_characters_left))
def clear_chat(self):
"""Чистим сообщение"""
self.text_edit.setText("")
def generate_new_key(self):
"""Генерация нового ключа"""
Спасибо!
