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/*
* 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