Build a Pycryptodome AES Cipher object.

    :param bytes key: Encryption key
    :param bytes iv: Initialization vector
    :returns: AES Cipher instance

def _cryptodome_cipher(key, iv):
    """Build a Pycryptodome AES Cipher object.

    :param bytes key: Encryption key
    :param bytes iv: Initialization vector
    :returns: AES Cipher instance
    """
    return AES.new(key, AES.MODE_CFB, iv, segment_size=128)