Last active
December 21, 2023 04:47
-
-
Save PaburoTC/74f96510479d5129100b994d1c06885a to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
import hashlib | |
from Crypto import Random | |
from Crypto.Cipher import AES | |
from base64 import b64encode, b64decode | |
class AESCipher(object): | |
def __init__(self, key): | |
self.block_size = AES.block_size | |
self.key = hashlib.sha256(key.encode()).digest() | |
def encrypt(self, plain_text): | |
plain_text = self.__pad(plain_text) | |
iv = Random.new().read(self.block_size) | |
cipher = AES.new(self.key, AES.MODE_CBC, iv) | |
encrypted_text = cipher.encrypt(plain_text.encode()) | |
return b64encode(iv + encrypted_text).decode("utf-8") | |
def decrypt(self, encrypted_text): | |
encrypted_text = b64decode(encrypted_text) | |
iv = encrypted_text[:self.block_size] | |
cipher = AES.new(self.key, AES.MODE_CBC, iv) | |
plain_text = cipher.decrypt(encrypted_text[self.block_size:]).decode("utf-8") | |
return self.__unpad(plain_text) | |
def __pad(self, plain_text): | |
number_of_bytes_to_pad = self.block_size - len(plain_text) % self.block_size | |
ascii_string = chr(number_of_bytes_to_pad) | |
padding_str = number_of_bytes_to_pad * ascii_string | |
padded_plain_text = plain_text + padding_str | |
return padded_plain_text | |
@staticmethod | |
def __unpad(plain_text): | |
last_character = plain_text[len(plain_text) - 1:] | |
return plain_text[:-ord(last_character)] |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment