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/backends/openssl/poly1305.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.exceptions import InvalidSignature
from cryptography.hazmat.primitives import constant_time


_POLY1305_TAG_SIZE = 16
_POLY1305_KEY_SIZE = 32


class _Poly1305Context(object):
    def __init__(self, backend, key):
        self._backend = backend

        key_ptr = self._backend._ffi.from_buffer(key)
        # This function copies the key into OpenSSL-owned memory so we don't
        # need to retain it ourselves
        evp_pkey = self._backend._lib.EVP_PKEY_new_raw_private_key(
            self._backend._lib.NID_poly1305,
            self._backend._ffi.NULL,
            key_ptr,
            len(key),
        )
        self._backend.openssl_assert(evp_pkey != self._backend._ffi.NULL)
        self._evp_pkey = self._backend._ffi.gc(
            evp_pkey, self._backend._lib.EVP_PKEY_free
        )
        ctx = self._backend._lib.Cryptography_EVP_MD_CTX_new()
        self._backend.openssl_assert(ctx != self._backend._ffi.NULL)
        self._ctx = self._backend._ffi.gc(
            ctx, self._backend._lib.Cryptography_EVP_MD_CTX_free
        )
        res = self._backend._lib.EVP_DigestSignInit(
            self._ctx,
            self._backend._ffi.NULL,
            self._backend._ffi.NULL,
            self._backend._ffi.NULL,
            self._evp_pkey,
        )
        self._backend.openssl_assert(res == 1)

    def update(self, data):
        data_ptr = self._backend._ffi.from_buffer(data)
        res = self._backend._lib.EVP_DigestSignUpdate(
            self._ctx, data_ptr, len(data)
        )
        self._backend.openssl_assert(res != 0)

    def finalize(self):
        buf = self._backend._ffi.new("unsigned char[]", _POLY1305_TAG_SIZE)
        outlen = self._backend._ffi.new("size_t *")
        res = self._backend._lib.EVP_DigestSignFinal(self._ctx, buf, outlen)
        self._backend.openssl_assert(res != 0)
        self._backend.openssl_assert(outlen[0] == _POLY1305_TAG_SIZE)
        return self._backend._ffi.buffer(buf)[: outlen[0]]

    def verify(self, tag):
        mac = self.finalize()
        if not constant_time.bytes_eq(mac, tag):
            raise InvalidSignature("Value did not match computed tag.")

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