RAND_SSLeay man page on DigitalUNIX

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RAND_set_rand_method(3)				       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 num‐
       ber  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
	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 (*sta‐
       tus)(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
       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
       The RAND_set_rand_method(), RAND_get_rand_method(),  and	 RAND_SSLeay()
       functions are available in all versions of OpenSSL.

SEE ALSO
       Functions: rand_ssl(3)

						       RAND_set_rand_method(3)
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