RAND_set_rand_method, RAND_get_rand_method, RAND_OpenSSL - select RAND method
#include <openssl/rand.h>
The following functions have been deprecated since OpenSSL 3.0, and can be
hidden entirely by defining
OPENSSL_API_COMPAT with a suitable version
value, see
openssl_user_macros(7):
RAND_METHOD *RAND_OpenSSL(void);
int RAND_set_rand_method(const RAND_METHOD *meth);
const RAND_METHOD *RAND_get_rand_method(void);
All of the functions described on this page are deprecated. Applications should
instead use
RAND_set_DRBG_type(3),
EVP_RAND(3) and
EVP_RAND(7).
A
RAND_METHOD specifies the functions that OpenSSL uses for random number
generation.
RAND_OpenSSL() returns the default
RAND_METHOD implementation by
OpenSSL. This implementation ensures that the PRNG state is unique for each
thread.
If an
ENGINE is loaded that provides the RAND API, however, it will be
used instead of the method returned by
RAND_OpenSSL(). This is
deprecated in OpenSSL 3.0.
RAND_set_rand_method() makes
meth the method for PRNG use. If an
ENGINE was providing the method, it will be released first.
RAND_get_rand_method() returns a pointer to the current
RAND_METHOD.
typedef struct rand_meth_st {
int (*seed)(const void *buf, int num);
int (*bytes)(unsigned char *buf, int num);
void (*cleanup)(void);
int (*add)(const void *buf, int num, double entropy);
int (*pseudorand)(unsigned char *buf, int num);
int (*status)(void);
} RAND_METHOD;
The fields point to functions that are used by, in order,
RAND_seed(),
RAND_bytes(), internal RAND cleanup,
RAND_add(),
RAND_pseudo_rand() and
RAND_status(). Each pointer may be NULL
if the function is not implemented.
RAND_set_rand_method() returns 1 on success and 0 on failure.
RAND_get_rand_method() and
RAND_OpenSSL() return pointers to the
respective methods.
EVP_RAND(3),
RAND_set_DRBG_type(3),
RAND_bytes(3),
ENGINE_by_id(3),
EVP_RAND(7),
RAND(7)
All of these functions were deprecated in OpenSSL 3.0.
Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the Apache License 2.0 (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>.