aes_sandbox.py

# conda install pycrypto
# All the credit to: https://www.it-swarm.dev/es/python/cifrar-y-descifrar-usando-pycrypto-aes-256/1069206762/

import base64
import hashlib
from Crypto import Random
from Crypto.Cipher import AES


class AESCipher(object):

    def __init__(self, key):
        self.bs = 32
        self.key = hashlib.sha256(key.encode()).digest()

    def encrypt(self, raw):
        raw = self._pad(raw)
        iv = Random.new().read(AES.block_size)
        cipher = AES.new(self.key, AES.MODE_CBC, iv)
        return base64.b64encode(iv + cipher.encrypt(raw))

    def decrypt(self, enc):
        enc = base64.b64decode(enc)
        iv = enc[:AES.block_size]
        cipher = AES.new(self.key, AES.MODE_CBC, iv)
        return self._unpad(cipher.decrypt(enc[AES.block_size:])).decode('utf-8')

    def _pad(self, s):
        return s + (self.bs - len(s) % self.bs) * chr(self.bs - len(s) % self.bs)

    @staticmethod
    def _unpad(s):
        return s[:-ord(s[len(s)-1:])]


if __name__ == "__main__":

    key = "M^fKQCoGx^2S09kp"

    aes_cipher = AESCipher(key)

    value = "user@doma.in"

    value_enc = aes_cipher.encrypt(value)
    value_dec = aes_cipher.decrypt(value_enc)

    assert value_dec == value

    value_enc2 = aes_cipher.encrypt(value)

    print(f"{value_enc}\n{value_enc2}")