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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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/*
 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, you can obtain one at https://mozilla.org/MPL/2.0/.
 *
 * See the COPYRIGHT file distributed with this work for additional
 * information regarding copyright ownership.
 */

#ifndef ISC_SHA1_H
#define ISC_SHA1_H 1

/*	$NetBSD: sha1.h,v 1.2 1998/05/29 22:55:44 thorpej Exp $	*/

/*! \file isc/sha1.h
 * \brief SHA-1 in C
 * \author By Steve Reid <steve@edmweb.com>
 * \note 100% Public Domain
 */

#include <stdbool.h>

#include <isc/lang.h>
#include <isc/platform.h>
#include <isc/types.h>

#define ISC_SHA1_DIGESTLENGTH 20U
#define ISC_SHA1_BLOCK_LENGTH 64U

#ifdef ISC_PLATFORM_OPENSSLHASH
#include <openssl/opensslv.h>
#include <openssl/evp.h>

typedef struct {
	EVP_MD_CTX *ctx;
#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
	EVP_MD_CTX _ctx;
#endif
} isc_sha1_t;

#elif PKCS11CRYPTO
#include <pk11/pk11.h>

typedef pk11_context_t isc_sha1_t;

#else

typedef struct {
	uint32_t state[5];
	uint32_t count[2];
	unsigned char buffer[ISC_SHA1_BLOCK_LENGTH];
} isc_sha1_t;
#endif

ISC_LANG_BEGINDECLS

void
isc_sha1_init(isc_sha1_t *ctx);

void
isc_sha1_invalidate(isc_sha1_t *ctx);

void
isc_sha1_update(isc_sha1_t *ctx, const unsigned char *data, unsigned int len);

void
isc_sha1_final(isc_sha1_t *ctx, unsigned char *digest);

bool
isc_sha1_check(bool testing);

ISC_LANG_ENDDECLS

#endif /* ISC_SHA1_H */

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