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　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。 . Prv8 Shell

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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 sys

from cryptography import utils
from cryptography.exceptions import (
    AlreadyFinalized,
    InvalidKey,
    UnsupportedAlgorithm,
    _Reasons,
)
from cryptography.hazmat.backends import _get_backend
from cryptography.hazmat.backends.interfaces import ScryptBackend
from cryptography.hazmat.primitives import constant_time
from cryptography.hazmat.primitives.kdf import KeyDerivationFunction


# This is used by the scrypt tests to skip tests that require more memory
# than the MEM_LIMIT
_MEM_LIMIT = sys.maxsize // 2


@utils.register_interface(KeyDerivationFunction)
class Scrypt(object):
    def __init__(self, salt, length, n, r, p, backend=None):
        backend = _get_backend(backend)
        if not isinstance(backend, ScryptBackend):
            raise UnsupportedAlgorithm(
                "Backend object does not implement ScryptBackend.",
                _Reasons.BACKEND_MISSING_INTERFACE,
            )

        self._length = length
        utils._check_bytes("salt", salt)
        if n < 2 or (n & (n - 1)) != 0:
            raise ValueError("n must be greater than 1 and be a power of 2.")

        if r < 1:
            raise ValueError("r must be greater than or equal to 1.")

        if p < 1:
            raise ValueError("p must be greater than or equal to 1.")

        self._used = False
        self._salt = salt
        self._n = n
        self._r = r
        self._p = p
        self._backend = backend

    def derive(self, key_material):
        if self._used:
            raise AlreadyFinalized("Scrypt instances can only be used once.")
        self._used = True

        utils._check_byteslike("key_material", key_material)
        return self._backend.derive_scrypt(
            key_material, self._salt, self._length, self._n, self._r, self._p
        )

    def verify(self, key_material, expected_key):
        derived_key = self.derive(key_material)
        if not constant_time.bytes_eq(derived_key, expected_key):
            raise InvalidKey("Keys do not match.")

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