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.\" ========================================================================
.\"
.IX Title "RAND_GET0_PRIMARY 3ossl"
.TH RAND_GET0_PRIMARY 3ossl "2024-09-03" "3.1.7+quic" "OpenSSL"
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.nh
.SH "NAME"
RAND_get0_primary,
RAND_get0_public,
RAND_get0_private,
RAND_set0_public,
RAND_set0_private
\&\- get access to the global EVP_RAND_CTX instances
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #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);
\& int RAND_set0_public(OSSL_LIB_CTX *ctx, EVP_RAND_CTX *rand);
\& int RAND_set0_private(OSSL_LIB_CTX *ctx, EVP_RAND_CTX *rand);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The default \s-1RAND API\s0 implementation (\fBRAND_OpenSSL()\fR) utilizes three
shared \s-1DRBG\s0 instances which are accessed via the \s-1RAND API:\s0
.PP
The \fIpublic\fR and \fIprivate\fR \s-1DRBG\s0 are thread-local instances, which are used
by \fBRAND_bytes()\fR and \fBRAND_priv_bytes()\fR, respectively.
The \fIprimary\fR \s-1DRBG\s0 is a global instance, which is not intended to be used
directly, but is used internally to reseed the other two instances.
.PP
The three get functions provide access to the shared \s-1DRBG\s0 instances.
.PP
The two set functions allow the public and private \s-1DRBG\s0 instances to be
replaced by another random number generator.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBRAND_get0_primary()\fR returns a pointer to the \fIprimary\fR \s-1DRBG\s0 instance
for the given \s-1OSSL_LIB_CTX\s0 \fBctx\fR.
.PP
\&\fBRAND_get0_public()\fR returns a pointer to the \fIpublic\fR \s-1DRBG\s0 instance
for the given \s-1OSSL_LIB_CTX\s0 \fBctx\fR.
.PP
\&\fBRAND_get0_private()\fR returns a pointer to the \fIprivate\fR \s-1DRBG\s0 instance
for the given \s-1OSSL_LIB_CTX\s0 \fBctx\fR.
.PP
\&\fBRAND_set0_public()\fR and \fBRAND_set0_private()\fR return 1 on success and 0
on error.
.SH "NOTES"
.IX Header "NOTES"
It is not thread-safe to access the \fIprimary\fR \s-1DRBG\s0 instance.
The \fIpublic\fR and \fIprivate\fR \s-1DRBG\s0 instance can be accessed safely, because
they are thread-local. Note however, that changes to these two instances
apply only to the current thread.
.PP
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 \s-1DRBG\s0 instances
at initialization time, before creating additional threads.
.PP
During initialization, it is possible to change the reseed interval
and reseed time interval.
It is also possible to exchange the reseeding callbacks entirely.
.PP
To set the type of \s-1DRBG\s0 that will be instantiated, use the
\&\fBRAND_set_DRBG_type\fR\|(3) call before accessing the random number generation
infrastructure.
.PP
The two set functions, operate on the the current thread.  If you want to
use the same random number generator across all threads, each thread
must individually call the set functions.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\s-1\fBEVP_RAND\s0\fR\|(3),
\&\fBRAND_set_DRBG_type\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
\&\fBRAND_set0_public()\fR and \fBRAND_set0_private()\fR were added in OpenSSL 3.1.
.PP
The remaining functions were added in OpenSSL 3.0.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2020\-2022 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the Apache License 2.0 (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.