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 : //lib64/python3.6/site-packages/cryptography/hazmat/primitives/serialization/pkcs12.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

from cryptography import x509
from cryptography.hazmat.backends import _get_backend
from cryptography.hazmat.primitives import serialization
from cryptography.hazmat.primitives.asymmetric import dsa, ec, rsa


def load_key_and_certificates(data, password, backend=None):
    backend = _get_backend(backend)
    return backend.load_key_and_certificates_from_pkcs12(data, password)


def serialize_key_and_certificates(name, key, cert, cas, encryption_algorithm):
    if key is not None and not isinstance(
        key,
        (
            rsa.RSAPrivateKeyWithSerialization,
            dsa.DSAPrivateKeyWithSerialization,
            ec.EllipticCurvePrivateKeyWithSerialization,
        ),
    ):
        raise TypeError("Key must be RSA, DSA, or EllipticCurve private key.")
    if cert is not None and not isinstance(cert, x509.Certificate):
        raise TypeError("cert must be a certificate")

    if cas is not None:
        cas = list(cas)
        if not all(isinstance(val, x509.Certificate) for val in cas):
            raise TypeError("all values in cas must be certificates")

    if not isinstance(
        encryption_algorithm, serialization.KeySerializationEncryption
    ):
        raise TypeError(
            "Key encryption algorithm must be a "
            "KeySerializationEncryption instance"
        )

    if key is None and cert is None and not cas:
        raise ValueError("You must supply at least one of key, cert, or cas")

    backend = _get_backend(None)
    return backend.serialize_key_and_certificates_to_pkcs12(
        name, key, cert, cas, encryption_algorithm
    )

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