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/include/openssl/sha.h
/*
 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the OpenSSL license (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

#ifndef HEADER_SHA_H
# define HEADER_SHA_H

# include <openssl/e_os2.h>
# include <stddef.h>

#ifdef  __cplusplus
extern "C" {
#endif

/*-
 * !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 * ! SHA_LONG has to be at least 32 bits wide.                    !
 * !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 */
# define SHA_LONG unsigned int

# define SHA_LBLOCK      16
# define SHA_CBLOCK      (SHA_LBLOCK*4)/* SHA treats input data as a
                                        * contiguous array of 32 bit wide
                                        * big-endian values. */
# define SHA_LAST_BLOCK  (SHA_CBLOCK-8)
# define SHA_DIGEST_LENGTH 20

typedef struct SHAstate_st {
    SHA_LONG h0, h1, h2, h3, h4;
    SHA_LONG Nl, Nh;
    SHA_LONG data[SHA_LBLOCK];
    unsigned int num;
} SHA_CTX;

int SHA1_Init(SHA_CTX *c);
int SHA1_Update(SHA_CTX *c, const void *data, size_t len);
int SHA1_Final(unsigned char *md, SHA_CTX *c);
unsigned char *SHA1(const unsigned char *d, size_t n, unsigned char *md);
void SHA1_Transform(SHA_CTX *c, const unsigned char *data);

# define SHA256_CBLOCK   (SHA_LBLOCK*4)/* SHA-256 treats input data as a
                                        * contiguous array of 32 bit wide
                                        * big-endian values. */

typedef struct SHA256state_st {
    SHA_LONG h[8];
    SHA_LONG Nl, Nh;
    SHA_LONG data[SHA_LBLOCK];
    unsigned int num, md_len;
} SHA256_CTX;

int SHA224_Init(SHA256_CTX *c);
int SHA224_Update(SHA256_CTX *c, const void *data, size_t len);
int SHA224_Final(unsigned char *md, SHA256_CTX *c);
unsigned char *SHA224(const unsigned char *d, size_t n, unsigned char *md);
int SHA256_Init(SHA256_CTX *c);
int SHA256_Update(SHA256_CTX *c, const void *data, size_t len);
int SHA256_Final(unsigned char *md, SHA256_CTX *c);
unsigned char *SHA256(const unsigned char *d, size_t n, unsigned char *md);
void SHA256_Transform(SHA256_CTX *c, const unsigned char *data);

# define SHA224_DIGEST_LENGTH    28
# define SHA256_DIGEST_LENGTH    32
# define SHA384_DIGEST_LENGTH    48
# define SHA512_DIGEST_LENGTH    64

/*
 * Unlike 32-bit digest algorithms, SHA-512 *relies* on SHA_LONG64
 * being exactly 64-bit wide. See Implementation Notes in sha512.c
 * for further details.
 */
/*
 * SHA-512 treats input data as a
 * contiguous array of 64 bit
 * wide big-endian values.
 */
# define SHA512_CBLOCK   (SHA_LBLOCK*8)
# if (defined(_WIN32) || defined(_WIN64)) && !defined(__MINGW32__)
#  define SHA_LONG64 unsigned __int64
#  define U64(C)     C##UI64
# elif defined(__arch64__)
#  define SHA_LONG64 unsigned long
#  define U64(C)     C##UL
# else
#  define SHA_LONG64 unsigned long long
#  define U64(C)     C##ULL
# endif

typedef struct SHA512state_st {
    SHA_LONG64 h[8];
    SHA_LONG64 Nl, Nh;
    union {
        SHA_LONG64 d[SHA_LBLOCK];
        unsigned char p[SHA512_CBLOCK];
    } u;
    unsigned int num, md_len;
} SHA512_CTX;

int SHA384_Init(SHA512_CTX *c);
int SHA384_Update(SHA512_CTX *c, const void *data, size_t len);
int SHA384_Final(unsigned char *md, SHA512_CTX *c);
unsigned char *SHA384(const unsigned char *d, size_t n, unsigned char *md);
int SHA512_Init(SHA512_CTX *c);
int SHA512_Update(SHA512_CTX *c, const void *data, size_t len);
int SHA512_Final(unsigned char *md, SHA512_CTX *c);
unsigned char *SHA512(const unsigned char *d, size_t n, unsigned char *md);
void SHA512_Transform(SHA512_CTX *c, const unsigned char *data);

#ifdef  __cplusplus
}
#endif

#endif

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