RAND_set_rand_method(3)

     RAND_set_rand_method(3)0.9.6h (2000-03-03)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 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.

     Page 1                                         (printed 1/19/103)