# This file is dual licensed under the terms of the Apache License, Version
# 2.0, and the BSD License. See the LICENSE file in the root of this repository
# for complete details.

from __future__ import absolute_import, division, print_function

import abc

import six


@six.add_metaclass(abc.ABCMeta)
class EllipticCurve(object):
    @abc.abstractproperty
    def name(self):
        """
        The name of the curve. e.g. secp256r1.
        """

    @abc.abstractproperty
    def key_size(self):
        """
        The bit length of the base point of the curve.
        """


@six.add_metaclass(abc.ABCMeta)
class EllipticCurveSignatureAlgorithm(object):
    @abc.abstractproperty
    def algorithm(self):
        """
        The digest algorithm used with this signature.
        """


@six.add_metaclass(abc.ABCMeta)
class EllipticCurvePrivateKey(object):
    @abc.abstractmethod
    def signer(self, signature_algorithm):
        """
        Returns an AsymmetricSignatureContext used for signing data.
        """

    @abc.abstractmethod
    def public_key(self):
        """
        The EllipticCurvePublicKey for this private key.
        """

    @abc.abstractproperty
    def curve(self):
        """
        The EllipticCurve that this key is on.
        """


@six.add_metaclass(abc.ABCMeta)
class EllipticCurvePrivateKeyWithNumbers(EllipticCurvePrivateKey):
    @abc.abstractmethod
    def private_numbers(self):
        """
        Returns an EllipticCurvePrivateNumbers.
        """


@six.add_metaclass(abc.ABCMeta)
class EllipticCurvePublicKey(object):
    @abc.abstractmethod
    def verifier(self, signature, signature_algorithm):
        """
        Returns an AsymmetricVerificationContext used for signing data.
        """

    @abc.abstractproperty
    def curve(self):
        """
        The EllipticCurve that this key is on.
        """


@six.add_metaclass(abc.ABCMeta)
class EllipticCurvePublicKeyWithNumbers(EllipticCurvePublicKey):
    @abc.abstractmethod
    def public_numbers(self):
        """
        Returns an EllipticCurvePublicNumbers.
        """