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NAME

       RAND_DRBG_get0_master, RAND_DRBG_get0_public, RAND_DRBG_get0_private - get access to the global RAND_DRBG
       instances

SYNOPSIS

        #include <openssl/rand_drbg.h>

        RAND_DRBG *RAND_DRBG_get0_master(void);
        RAND_DRBG *RAND_DRBG_get0_public(void);
        RAND_DRBG *RAND_DRBG_get0_private(void);

DESCRIPTION

       The default RAND API implementation (RAND_OpenSSL()) utilizes three shared DRBG instances which are
       accessed via the RAND API:

       The <public> and <private> DRBG are thread-local instances, which are used by RAND_bytes() and
       RAND_priv_bytes(), respectively.  The <master> 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.

RETURN VALUES

       RAND_DRBG_get0_master() returns a pointer to the <master> DRBG instance.

       RAND_DRBG_get0_public() returns a pointer to the <public> DRBG instance.

       RAND_DRBG_get0_private() returns a pointer to the <private> DRBG instance.

NOTES

       It is not thread-safe to access the <master> DRBG instance.  The <public> and <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.

HISTORY

       The RAND_DRBG functions were added in OpenSSL 1.1.1.

SEE ALSO

       RAND_DRBG_set_callbacks(3), RAND_DRBG_set_reseed_defaults(3), RAND_DRBG_set_reseed_interval(3),
       RAND_DRBG_set_reseed_time_interval(3), RAND_DRBG_set_callbacks(3), RAND_DRBG_generate(3), RAND_DRBG(7)

COPYRIGHT

       Copyright 2017-2018 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
       <https://www.openssl.org/source/license.html>.