mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-12-01 12:53:27 +01:00
83 lines
2.5 KiB
Plaintext
83 lines
2.5 KiB
Plaintext
=pod
|
|
|
|
=head1 NAME
|
|
|
|
RAND_get0_primary,
|
|
RAND_get0_public,
|
|
RAND_get0_private
|
|
- get access to the global EVP_RAND_CTX instances
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#include <openssl/rand.h>
|
|
|
|
EVP_RAND_CTX *RAND_get0_primary(OSSL_LIB_CTX *ctx);
|
|
EVP_RAND_CTX *RAND_get0_public(OSSL_LIB_CTX *ctx);
|
|
EVP_RAND_CTX *RAND_get0_private(OSSL_LIB_CTX *ctx);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
The default RAND API implementation (RAND_OpenSSL()) utilizes three
|
|
shared DRBG instances which are accessed via the RAND API:
|
|
|
|
The I<public> and I<private> DRBG are thread-local instances, which are used
|
|
by RAND_bytes() and RAND_priv_bytes(), respectively.
|
|
The I<primary> DRBG is a global instance, which is not intended to be used
|
|
directly, but is used internally to reseed the other two instances.
|
|
|
|
These functions here provide access to the shared DRBG instances.
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
RAND_get0_primary() returns a pointer to the I<primary> DRBG instance
|
|
for the given OSSL_LIB_CTX B<ctx>.
|
|
|
|
RAND_get0_public() returns a pointer to the I<public> DRBG instance
|
|
for the given OSSL_LIB_CTX B<ctx>.
|
|
|
|
RAND_get0_private() returns a pointer to the I<private> DRBG instance
|
|
for the given OSSL_LIB_CTX B<ctx>.
|
|
|
|
In all the above cases the B<ctx> parameter can
|
|
be NULL in which case the default OSSL_LIB_CTX is used.
|
|
|
|
=head1 NOTES
|
|
|
|
It is not thread-safe to access the I<primary> DRBG instance.
|
|
The I<public> and I<private> DRBG instance can be accessed safely, because
|
|
they are thread-local. Note however, that changes to these two instances
|
|
apply only to the current thread.
|
|
|
|
For that reason it is recommended not to change the settings of these
|
|
three instances directly.
|
|
Instead, an application should change the default settings for new DRBG instances
|
|
at initialization time, before creating additional threads.
|
|
|
|
During initialization, it is possible to change the reseed interval
|
|
and reseed time interval.
|
|
It is also possible to exchange the reseeding callbacks entirely.
|
|
|
|
To set the type of DRBG that will be instantiated, use the
|
|
L<RAND_set_DRBG_type(3)> call before accessing the random number generation
|
|
infrastructure.
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<EVP_RAND(3)>,
|
|
L<RAND_set_DRBG_type(3)>
|
|
|
|
=head1 HISTORY
|
|
|
|
These functions were added in OpenSSL 3.0.
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright 2020-2021 The OpenSSL Project Authors. All Rights Reserved.
|
|
|
|
Licensed under the Apache License 2.0 (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
|