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+.\" ========================================================================
+.\"
+.IX Title "RAND_GET0_PRIMARY 3ossl"
+.TH RAND_GET0_PRIMARY 3ossl "2023-09-19" "3.0.11" "OpenSSL"
+.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
+.\" way too many mistakes in technical documents.
+.if n .ad l
+.nh
+.SH "NAME"
+RAND_get0_primary,
+RAND_get0_public,
+RAND_get0_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);
+.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
+These functions here provide access to the shared \s-1DRBG\s0 instances.
+.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
+In all the above cases the \fBctx\fR parameter can
+be \s-1NULL\s0 in which case the default \s-1OSSL_LIB_CTX\s0 is used.
+.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.
+.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"
+These functions were added in OpenSSL 3.0.
+.SH "COPYRIGHT"
+.IX Header "COPYRIGHT"
+Copyright 2020\-2021 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>.