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/rand_drbg.h
/*
 * Copyright 2017-2018 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_DRBG_RAND_H
# define HEADER_DRBG_RAND_H

# include <time.h>
# include <openssl/ossl_typ.h>
# include <openssl/obj_mac.h>

/*
 * RAND_DRBG  flags
 *
 * Note: if new flags are added, the constant `rand_drbg_used_flags`
 *       in drbg_lib.c needs to be updated accordingly.
 */

/* In CTR mode, disable derivation function ctr_df */
# define RAND_DRBG_FLAG_CTR_NO_DF            0x1


# if OPENSSL_API_COMPAT < 0x10200000L
/* This #define was replaced by an internal constant and should not be used. */
#  define RAND_DRBG_USED_FLAGS  (RAND_DRBG_FLAG_CTR_NO_DF)
# endif

/*
 * Default security strength (in the sense of [NIST SP 800-90Ar1])
 *
 * NIST SP 800-90Ar1 supports the strength of the DRBG being smaller than that
 * of the cipher by collecting less entropy. The current DRBG implementation
 * does not take RAND_DRBG_STRENGTH into account and sets the strength of the
 * DRBG to that of the cipher.
 *
 * RAND_DRBG_STRENGTH is currently only used for the legacy RAND
 * implementation.
 *
 * Currently supported ciphers are: NID_aes_128_ctr, NID_aes_192_ctr and
 * NID_aes_256_ctr
 */
# define RAND_DRBG_STRENGTH             256
/* Default drbg type */
# define RAND_DRBG_TYPE                 NID_aes_256_ctr
/* Default drbg flags */
# define RAND_DRBG_FLAGS                0


# ifdef  __cplusplus
extern "C" {
# endif

/*
 * Object lifetime functions.
 */
RAND_DRBG *RAND_DRBG_new(int type, unsigned int flags, RAND_DRBG *parent);
RAND_DRBG *RAND_DRBG_secure_new(int type, unsigned int flags, RAND_DRBG *parent);
int RAND_DRBG_set(RAND_DRBG *drbg, int type, unsigned int flags);
int RAND_DRBG_set_defaults(int type, unsigned int flags);
int RAND_DRBG_instantiate(RAND_DRBG *drbg,
                          const unsigned char *pers, size_t perslen);
int RAND_DRBG_uninstantiate(RAND_DRBG *drbg);
void RAND_DRBG_free(RAND_DRBG *drbg);

/*
 * Object "use" functions.
 */
int RAND_DRBG_reseed(RAND_DRBG *drbg,
                     const unsigned char *adin, size_t adinlen,
                     int prediction_resistance);
int RAND_DRBG_generate(RAND_DRBG *drbg, unsigned char *out, size_t outlen,
                       int prediction_resistance,
                       const unsigned char *adin, size_t adinlen);
int RAND_DRBG_bytes(RAND_DRBG *drbg, unsigned char *out, size_t outlen);

int RAND_DRBG_set_reseed_interval(RAND_DRBG *drbg, unsigned int interval);
int RAND_DRBG_set_reseed_time_interval(RAND_DRBG *drbg, time_t interval);

int RAND_DRBG_set_reseed_defaults(
                                  unsigned int master_reseed_interval,
                                  unsigned int slave_reseed_interval,
                                  time_t master_reseed_time_interval,
                                  time_t slave_reseed_time_interval
                                  );

RAND_DRBG *RAND_DRBG_get0_master(void);
RAND_DRBG *RAND_DRBG_get0_public(void);
RAND_DRBG *RAND_DRBG_get0_private(void);

/*
 * EXDATA
 */
# define RAND_DRBG_get_ex_new_index(l, p, newf, dupf, freef) \
    CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DRBG, l, p, newf, dupf, freef)
int RAND_DRBG_set_ex_data(RAND_DRBG *drbg, int idx, void *arg);
void *RAND_DRBG_get_ex_data(const RAND_DRBG *drbg, int idx);

/*
 * Callback function typedefs
 */
typedef size_t (*RAND_DRBG_get_entropy_fn)(RAND_DRBG *drbg,
                                           unsigned char **pout,
                                           int entropy, size_t min_len,
                                           size_t max_len,
                                           int prediction_resistance);
typedef void (*RAND_DRBG_cleanup_entropy_fn)(RAND_DRBG *ctx,
                                             unsigned char *out, size_t outlen);
typedef size_t (*RAND_DRBG_get_nonce_fn)(RAND_DRBG *drbg, unsigned char **pout,
                                         int entropy, size_t min_len,
                                         size_t max_len);
typedef void (*RAND_DRBG_cleanup_nonce_fn)(RAND_DRBG *drbg,
                                           unsigned char *out, size_t outlen);

int RAND_DRBG_set_callbacks(RAND_DRBG *drbg,
                            RAND_DRBG_get_entropy_fn get_entropy,
                            RAND_DRBG_cleanup_entropy_fn cleanup_entropy,
                            RAND_DRBG_get_nonce_fn get_nonce,
                            RAND_DRBG_cleanup_nonce_fn cleanup_nonce);


# ifdef  __cplusplus
}
# endif

#endif

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