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  "   ˆl–Ãa¾”ªeJu@·pÜlJbÑ¿Áƒ}·AÀ¿ %b    # 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

from cryptography import utils


@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 exchange(self, algorithm, peer_public_key):
        """
        Performs a key exchange operation using the provided algorithm with the
        provided peer's public key.
        """

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

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

    @abc.abstractproperty
    def sign(self, data, signature_algorithm):
        """
        Signs the data
        """


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

    @abc.abstractmethod
    def private_bytes(self, encoding, format, encryption_algorithm):
        """
        Returns the key serialized as bytes.
        """


@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.
        """

    @abc.abstractmethod
    def public_numbers(self):
        """
        Returns an EllipticCurvePublicNumbers.
        """

    @abc.abstractmethod
    def public_bytes(self, encoding, format):
        """
        Returns the key serialized as bytes.
        """

    @abc.abstractmethod
    def verify(self, signature, data, signature_algorithm):
        """
        Verifies the signature of the data.
        """


EllipticCurvePublicKeyWithSerialization = EllipticCurvePublicKey


@utils.register_interface(EllipticCurve)
class SECT571R1(object):
    name = "sect571r1"
    key_size = 571


@utils.register_interface(EllipticCurve)
class SECT409R1(object):
    name = "sect409r1"
    key_size = 409


@utils.register_interface(EllipticCurve)
class SECT283R1(object):
    name = "sect283r1"
    key_size = 283


@utils.register_interface(EllipticCurve)
class SECT233R1(object):
    name = "sect233r1"
    key_size = 233


@utils.register_interface(EllipticCurve)
class SECT163R2(object):
    name = "sect163r2"
    key_size = 163


@utils.register_interface(EllipticCurve)
class SECT571K1(object):
    name = "sect571k1"
    key_size = 571


@utils.register_interface(EllipticCurve)
class SECT409K1(object):
    name = "sect409k1"
    key_size = 409


@utils.register_interface(EllipticCurve)
class SECT283K1(object):
    name = "sect283k1"
    key_size = 283


@utils.register_interface(EllipticCurve)
class SECT233K1(object):
    name = "sect233k1"
    key_size = 233


@utils.register_interface(EllipticCurve)
class SECT163K1(object):
    name = "sect163k1"
    key_size = 163


@utils.register_interface(EllipticCurv