Python laravel encryption

laravel_encryption.py

from Crypto import Random
from Crypto.Cipher import AES
import base64
import json
from phpserialize import unserialize, dumps
import hmac
import hashlib


class LaravelEncryption:
    def __init__(self, key):
        # self.key = key
        AES.block_size = 16
        self.key = base64.b64decode(key)

    def decrypt(self, text):
        decoded_text = base64.b64decode(text)
        decoded_text = json.loads(decoded_text)
        iv = base64.b64decode(decoded_text['iv'])

        crypt_object = AES.new(key=self.key, mode=AES.MODE_CBC, IV=iv)

        decoded = base64.b64decode(decoded_text['value'])
        decrypted = crypt_object.decrypt(decoded)

        return unserialize(decrypted).decode('UTF-8')

    def encrypt(self, text):
        iv = Random.new().read(AES.block_size)
        text = dumps(text)
        padding = 16 - len(text) % 16
        text += bytes(chr(padding) * padding, 'utf-8')
        cipher = AES.new(self.key, mode=AES.MODE_CBC, IV=iv)
        value = base64.b64encode(cipher.encrypt(text))
        iv = base64.b64encode(iv)
        mac = hmac.new(self.key, iv + value, hashlib.sha256).hexdigest()
        dic = {'iv': iv.decode(), 'value': value.decode(), 'mac': mac}

        return base64.b64encode(bytes(json.dumps(dic), 'utf-8')).decode('UTF-8')

test_laravel_encryption.py

from app.utils.laravel_encryption import LaravelEncryption

key = b'QhGi88ju4rsBrtLRRalWvTvMoux7/7AnkvJZ49y9Q3M='
message = '{"message":"hello world"}'


def test_should_decrypt_from_laravel():
    # arrange
    encrypted = 'eyJpdiI6IitnRUVva2tNckhwdHMzeFlVOWl5TlE9PSIsInZhbHVlIjoiSURHb1VhY0ZRZVZIdm1ZRTJ1TDhXZC9rMGVqUVY5MnRpN3BoSHc4UzZsZVJnUFpyZVRidDE0UEtJMXFxOWxpNiIsIm1hYyI6ImViMDM5ZDE4NTg3MWNiYmZlYzM0NjNiYmZjNTVkMTQ4N2M2ODdjYTU2ZDgxOGYwNTM0MDllNDQzYmI3ZWIyNmEifQ=='

    # action
    result = LaravelEncryption(key).decrypt(encrypted)

    # assert
    assert message == result


def test_should_encrypt_from_laravel():
    # action
    result = LaravelEncryption(key).encrypt(message)
    result = LaravelEncryption(key).decrypt(result)

    # assert
    assert result == message