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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. 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 (*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
  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)

Index for Section 3

Alphabetical listing for R

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