certificate should not be required to issue 'good' response about ocspbuilder HOT 2 OPEN

class CertificateInfo(object):
    def issuer_name_hash(self, hash_name):
        """
        :param hash_name:
            A unicode string of a hash name: "sha1", "sha256", "sha512"

        :return:
            A byte string of the hash of the issuer's DER-encoded name
        """

        raise NotImplementedError()

    def issuer_key_hash(self, hash_name):
        """
        :param hash_name:
            A unicode string of a hash name: "sha1", "sha256", "sha512"

        :return:
            A byte string of the hash of the issuer's DER-encoded public key
        """

        raise NotImplementedError()

    def serial_number(self):
        """
        :return:
            An integer of the certificate's serial number
        """

        raise NotImplementedError()