@abc.abstractmethod
    def signer(self, padding, algorithm):
Parse a string to a boolean, ignoring case. "true"/"1" is True,
dataset/ETHPy150Open cloudera/hue/desktop/core/ext-py/cryptography-1.3.1/src/cryptography/hazmat/primitives/asymmetric/rsa.py/RSAPrivateKey.signer--crossover with--dataset/ETHPy150Open kivy/kivy/kivy/parser.py/parse_bool