def encrypt(self, params: str, key: str, iv: str) -> str:

        """加密"""

        generator = AES.new(key.encode("utf8"),

                            AES.MODE_CBC, iv.encode("utf8"))

        bs = AES.block_size

        pad = lambda s: s + (self.bs - len(s) %

                             self.bs) * chr(self.bs - len(s) % self.bs)

        data = bytes(pad(params), encoding="utf8")

        crypt = generator.encrypt(data)

        crypted_str = base64.b64encode(crypt)

        return crypted_str.decode()

    def decrypt(self, params: str, key: str, iv: str) -> dict:

        """解密"""

        decode = base64.b64decode(params)

        cryptor = AES.new(key.encode("utf8"),

                          AES.MODE_CBC, iv.encode("utf8"))

        plain_text = cryptor.decrypt(decode)

        unpad = lambda s: s[0:-ord(s[-1:])]

        return unpad(plain_text)

pip install pycryptodome