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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# 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
from enum import Enum

import six

from cryptography import utils
from cryptography.hazmat.backends import _get_backend


def load_pem_private_key(data, password, backend=None):
    backend = _get_backend(backend)
    return backend.load_pem_private_key(data, password)


def load_pem_public_key(data, backend=None):
    backend = _get_backend(backend)
    return backend.load_pem_public_key(data)


def load_pem_parameters(data, backend=None):
    backend = _get_backend(backend)
    return backend.load_pem_parameters(data)


def load_der_private_key(data, password, backend=None):
    backend = _get_backend(backend)
    return backend.load_der_private_key(data, password)


def load_der_public_key(data, backend=None):
    backend = _get_backend(backend)
    return backend.load_der_public_key(data)


def load_der_parameters(data, backend=None):
    backend = _get_backend(backend)
    return backend.load_der_parameters(data)


class Encoding(Enum):
    PEM = "PEM"
    DER = "DER"
    OpenSSH = "OpenSSH"
    Raw = "Raw"
    X962 = "ANSI X9.62"
    SMIME = "S/MIME"


class PrivateFormat(Enum):
    PKCS8 = "PKCS8"
    TraditionalOpenSSL = "TraditionalOpenSSL"
    Raw = "Raw"
    OpenSSH = "OpenSSH"


class PublicFormat(Enum):
    SubjectPublicKeyInfo = "X.509 subjectPublicKeyInfo with PKCS#1"
    PKCS1 = "Raw PKCS#1"
    OpenSSH = "OpenSSH"
    Raw = "Raw"
    CompressedPoint = "X9.62 Compressed Point"
    UncompressedPoint = "X9.62 Uncompressed Point"


class ParameterFormat(Enum):
    PKCS3 = "PKCS3"


@six.add_metaclass(abc.ABCMeta)
class KeySerializationEncryption(object):
    pass


@utils.register_interface(KeySerializationEncryption)
class BestAvailableEncryption(object):
    def __init__(self, password):
        if not isinstance(password, bytes) or len(password) == 0:
            raise ValueError("Password must be 1 or more bytes.")

        self.password = password


@utils.register_interface(KeySerializationEncryption)
class NoEncryption(object):
    pass

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