3986b9bb6b
Reported-by: misspell-fixer <https://github.com/vlajos/misspell-fixer> CLA: trivial Reviewed-by: Matthias St. Pierre <Matthias.St.Pierre@ncp-e.com> Reviewed-by: Richard Levitte <levitte@openssl.org> (Merged from https://github.com/openssl/openssl/pull/10544) (cherry picked from commit 79c44b4e3044aee9dc9618850d4f1ce067757b4b)
70 lines
2 KiB
Text
70 lines
2 KiB
Text
=pod
|
|
|
|
=head1 NAME
|
|
|
|
RAND_set_rand_method, RAND_get_rand_method, RAND_OpenSSL - select RAND method
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#include <openssl/rand.h>
|
|
|
|
RAND_METHOD *RAND_OpenSSL(void);
|
|
|
|
int RAND_set_rand_method(const RAND_METHOD *meth);
|
|
|
|
const RAND_METHOD *RAND_get_rand_method(void);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
A B<RAND_METHOD> specifies the functions that OpenSSL uses for random number
|
|
generation.
|
|
|
|
RAND_OpenSSL() returns the default B<RAND_METHOD> implementation by OpenSSL.
|
|
This implementation ensures that the PRNG state is unique for each thread.
|
|
|
|
If an B<ENGINE> is loaded that provides the RAND API, however, it will
|
|
be used instead of the method returned by RAND_OpenSSL().
|
|
|
|
RAND_set_rand_method() makes B<meth> the method for PRNG use. If an
|
|
ENGINE was providing the method, it will be released first.
|
|
|
|
RAND_get_rand_method() returns a pointer to the current B<RAND_METHOD>.
|
|
|
|
=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 randomness);
|
|
int (*pseudorand)(unsigned char *buf, int num);
|
|
int (*status)(void);
|
|
} RAND_METHOD;
|
|
|
|
The fields point to functions that are used by, in order,
|
|
RAND_seed(), RAND_bytes(), internal RAND cleanup, RAND_add(), RAND_pseudo_rand()
|
|
and RAND_status().
|
|
Each pointer may be NULL if the function is not implemented.
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
RAND_set_rand_method() returns 1 on success and 0 on failure.
|
|
RAND_get_rand_method() and RAND_OpenSSL() return pointers to the respective
|
|
methods.
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<RAND_bytes(3)>,
|
|
L<ENGINE_by_id(3)>,
|
|
L<RAND(7)>
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright 2000-2019 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
|