晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //usr/lib64/python3.6/site-packages/cryptography/hazmat/primitives/asymmetric/ed448.py
# 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.exceptions import UnsupportedAlgorithm, _Reasons


@six.add_metaclass(abc.ABCMeta)
class Ed448PublicKey(object):
    @classmethod
    def from_public_bytes(cls, data):
        from cryptography.hazmat.backends.openssl.backend import backend

        if not backend.ed448_supported():
            raise UnsupportedAlgorithm(
                "ed448 is not supported by this version of OpenSSL.",
                _Reasons.UNSUPPORTED_PUBLIC_KEY_ALGORITHM,
            )

        return backend.ed448_load_public_bytes(data)

    @abc.abstractmethod
    def public_bytes(self, encoding, format):
        """
        The serialized bytes of the public key.
        """

    @abc.abstractmethod
    def verify(self, signature, data):
        """
        Verify the signature.
        """


@six.add_metaclass(abc.ABCMeta)
class Ed448PrivateKey(object):
    @classmethod
    def generate(cls):
        from cryptography.hazmat.backends.openssl.backend import backend

        if not backend.ed448_supported():
            raise UnsupportedAlgorithm(
                "ed448 is not supported by this version of OpenSSL.",
                _Reasons.UNSUPPORTED_PUBLIC_KEY_ALGORITHM,
            )
        return backend.ed448_generate_key()

    @classmethod
    def from_private_bytes(cls, data):
        from cryptography.hazmat.backends.openssl.backend import backend

        if not backend.ed448_supported():
            raise UnsupportedAlgorithm(
                "ed448 is not supported by this version of OpenSSL.",
                _Reasons.UNSUPPORTED_PUBLIC_KEY_ALGORITHM,
            )

        return backend.ed448_load_private_bytes(data)

    @abc.abstractmethod
    def public_key(self):
        """
        The Ed448PublicKey derived from the private key.
        """

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

    @abc.abstractmethod
    def private_bytes(self, encoding, format, encryption_algorithm):
        """
        The serialized bytes of the private key.
        """

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