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/lib/python3.6/site-packages/jwt/contrib/algorithms/pycrypto.py
import Crypto.Hash.SHA256
import Crypto.Hash.SHA384
import Crypto.Hash.SHA512
from Crypto.PublicKey import RSA
from Crypto.Signature import PKCS1_v1_5

from jwt.algorithms import Algorithm
from jwt.compat import string_types, text_type


class RSAAlgorithm(Algorithm):
    """
    Performs signing and verification operations using
    RSASSA-PKCS-v1_5 and the specified hash function.

    This class requires PyCrypto package to be installed.

    This is based off of the implementation in PyJWT 0.3.2
    """
    SHA256 = Crypto.Hash.SHA256
    SHA384 = Crypto.Hash.SHA384
    SHA512 = Crypto.Hash.SHA512

    def __init__(self, hash_alg):
        self.hash_alg = hash_alg

    def prepare_key(self, key):

        if isinstance(key, RSA._RSAobj):
            return key

        if isinstance(key, string_types):
            if isinstance(key, text_type):
                key = key.encode('utf-8')

            key = RSA.importKey(key)
        else:
            raise TypeError('Expecting a PEM- or RSA-formatted key.')

        return key

    def sign(self, msg, key):
        return PKCS1_v1_5.new(key).sign(self.hash_alg.new(msg))

    def verify(self, msg, key, sig):
        return PKCS1_v1_5.new(key).verify(self.hash_alg.new(msg), sig)

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