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RAND_set_rand_method(3)
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RAND_set_rand_method, RAND_get_rand_method, RAND_SSLeay -
Select RAND method
#include <openssl/rand.h>
void RAND_set_rand_method(
RAND_METHOD *meth ); RAND_METHOD
*RAND_get_rand_method(
void ); RAND_METHOD *RAND_SSLeay(
void );
A RAND_METHOD specifies the functions that OpenSSL uses
for random number generation. By modifying the method,
alternative implementations such as hardware RNGs may be
used. Initially, the default is to use the OpenSSL internal
implementation. The RAND_SSLeay() function returns a
pointer to that method.
The RAND_set_rand_method() function sets the RAND method
to meth. The RAND_get_rand_method() function returns a
pointer to the current method.
RAND_method Structure [Toc] [Back]
typedef struct rand_meth_st
{
void (*seed)(const void *buf, int num);
int (*bytes)(unsigned char *buf, int num);
void (*cleanup)(void);
void (*add)(const void *buf, int num, int
entropy);
int (*pseudorand)(unsigned char *buf, int num);
int (*status)(void);
} RAND_METHOD;
The components point to the implementation of the
RAND_seed(), RAND_bytes(), RAND_cleanup(), RAND_add(),
RAND_pseudo_rand(), and RAND_status() functions. Each component
may be NULL if the function is not implemented.
The RAND_set_rand_method() function returns no value. The
RAND_get_rand_method() and RAND_SSLeay() functions return
pointers to the respective methods.
The RAND_set_rand_method(), RAND_get_rand_method(), and
RAND_SSLeay() functions are available in all versions of
OpenSSL.
Functions: rand_ssl(3)
RAND_set_rand_method(3)
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