RAND_set_rand_method(3) OpenSSL RAND_set_rand_method(3)NAME
RAND_set_rand_method, RAND_get_rand_method, RAND_SSLeay - select RAND
method
SYNOPSIS
#include <openssl/rand.h>
void RAND_set_rand_method(RAND_METHOD *meth);
RAND_METHOD *RAND_get_rand_method(void);
RAND_METHOD *RAND_SSLeay(void);
DESCRIPTION
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. RAND_SSLeay() returns a pointer to
that method.
RAND_set_rand_method() sets the RAND method to meth.
RAND_get_rand_method() returns a pointer to the current method.
THE RAND_METHOD STRUCTURE
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 RAND_seed(),
RAND_bytes(), RAND_cleanup(), RAND_add(), RAND_pseudo_rand() and
RAND_status(). Each component may be NULL if the function is not
implemented.
RETURN VALUESRAND_set_rand_method() returns no value. RAND_get_rand_method() and
RAND_SSLeay() return pointers to the respective methods.
SEE ALSOrand(3)HISTORYRAND_set_rand_method(), RAND_get_rand_method() and RAND_SSLeay() are
available in all versions of OpenSSL.
3rd Berkeley Distribution 0.9.6m RAND_set_rand_method(3)
