05ea606a25
Fix some code examples, trailing whitespace Fix TBA sections in verify, remove others. Remove empty sections Use Mixed Case not ALL CAPS in head2 Enhance doc-nits script. Remove extra =cut line Reviewed-by: Richard Levitte <levitte@openssl.org>
81 lines
2.7 KiB
Text
81 lines
2.7 KiB
Text
=pod
|
|
|
|
=head1 NAME
|
|
|
|
RAND_set_rand_method, RAND_get_rand_method, RAND_OpenSSL - select RAND method
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#include <openssl/rand.h>
|
|
|
|
void RAND_set_rand_method(const RAND_METHOD *meth);
|
|
|
|
const RAND_METHOD *RAND_get_rand_method(void);
|
|
|
|
RAND_METHOD *RAND_OpenSSL(void);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
A B<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. IMPORTANT: See the NOTES section for important
|
|
information about how these RAND API functions are affected by the use of
|
|
B<ENGINE> API calls.
|
|
|
|
Initially, the default RAND_METHOD is the OpenSSL internal implementation, as
|
|
returned by RAND_OpenSSL().
|
|
|
|
RAND_set_default_method() makes B<meth> the method for PRNG use. B<NB>: This is
|
|
true only whilst no ENGINE has been set as a default for RAND, so this function
|
|
is no longer recommended.
|
|
|
|
RAND_get_default_method() returns a pointer to the current RAND_METHOD.
|
|
However, the meaningfulness of this result is dependent on whether the ENGINE
|
|
API is being used, so this function is no longer recommended.
|
|
|
|
=head1 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 method implementations used by (or called by), in order,
|
|
RAND_seed(), RAND_bytes(), internal RAND cleanup, RAND_add(), RAND_pseudo_rand()
|
|
and RAND_status().
|
|
Each component may be NULL if the function is not implemented.
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
RAND_set_rand_method() returns no value. RAND_get_rand_method() and
|
|
RAND_OpenSSL() return pointers to the respective methods.
|
|
|
|
=head1 NOTES
|
|
|
|
RAND_METHOD implementations are grouped together with other
|
|
algorithmic APIs (eg. RSA_METHOD, EVP_CIPHER, etc) in B<ENGINE> modules. If a
|
|
default ENGINE is specified for RAND functionality using an ENGINE API function,
|
|
that will override any RAND defaults set using the RAND API (ie.
|
|
RAND_set_rand_method()). For this reason, the ENGINE API is the recommended way
|
|
to control default implementations for use in RAND and other cryptographic
|
|
algorithms.
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<rand(3)>, L<engine(3)>
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
|
|
|
|
Licensed under the OpenSSL license (the "License"). You may not use
|
|
this file except in compliance with the License. You can obtain a copy
|
|
in the file LICENSE in the source distribution or at
|
|
L<https://www.openssl.org/source/license.html>.
|
|
|
|
=cut
|