NAME    [Toc]    [Back]

       RAND_set_rand_method,  RAND_get_rand_method, RAND_SSLeay -
       Select RAND method

SYNOPSIS    [Toc]    [Back]

       #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    [Toc]    [Back]

       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.

RETURN VALUES    [Toc]    [Back]

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

HISTORY    [Toc]    [Back]

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

SEE ALSO    [Toc]    [Back]

       Functions: rand_ssl(3)



                                          RAND_set_rand_method(3)