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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 VALUES
     RAND_set_rand_method() returns no value.
     RAND_get_rand_method() and RAND_SSLeay() return pointers to
     the respective methods.



SEE ALSO
     rand(3)



HISTORY
     RAND_set_rand_method(), RAND_get_rand_method() and
     RAND_SSLeay() are available in all versions of OpenSSL.









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Created 1996-2024 by Maxim Chirkov

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