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 warnings

from cryptography import utils
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives.asymmetric.utils import Prehashed


def _evp_pkey_derive(backend, evp_pkey, peer_public_key):
    ctx = backend._lib.EVP_PKEY_CTX_new(evp_pkey, backend._ffi.NULL)
    backend.openssl_assert(ctx != backend._ffi.NULL)
    ctx = backend._ffi.gc(ctx, backend._lib.EVP_PKEY_CTX_free)
    res = backend._lib.EVP_PKEY_derive_init(ctx)
    backend.openssl_assert(res == 1)
    res = backend._lib.EVP_PKEY_derive_set_peer(ctx, peer_public_key._evp_pkey)
    backend.openssl_assert(res == 1)
    keylen = backend._ffi.new("size_t *")
    res = backend._lib.EVP_PKEY_derive(ctx, backend._ffi.NULL, keylen)
    backend.openssl_assert(res == 1)
    backend.openssl_assert(keylen[0] > 0)
    buf = backend._ffi.new("unsigned char[]", keylen[0])
    res = backend._lib.EVP_PKEY_derive(ctx, buf, keylen)
    if res != 1:
        raise ValueError("Null shared key derived from public/private pair.")

    return backend._ffi.buffer(buf, keylen[0])[:]


def _calculate_digest_and_algorithm(backend, data, algorithm):
    if not isinstance(algorithm, Prehashed):
        hash_ctx = hashes.Hash(algorithm, backend)
        hash_ctx.update(data)
        data = hash_ctx.finalize()
    else:
        algorithm = algorithm._algorithm

    if len(data) != algorithm.digest_size:
        raise ValueError(
            "The provided data must be the same length as the hash "
            "algorithm's digest size."
        )

    return (data, algorithm)


def _check_not_prehashed(signature_algorithm):
    if isinstance(signature_algorithm, Prehashed):
        raise TypeError(
            "Prehashed is only supported in the sign and verify methods. "
            "It cannot be used with signer or verifier."
        )


def _warn_sign_verify_deprecated():
    warnings.warn(
        "signer and verifier have been deprecated. Please use sign "
        "and verify instead.",
        utils.PersistentlyDeprecated2017,
        stacklevel=3,
    )

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