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RAND_DRBG_get0_master(3)            OpenSSL           RAND_DRBG_get0_master(3)



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

LIBRARY
       libcrypto, -lcrypto

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.

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)

HISTORY
       The RAND_DRBG functions were added in OpenSSL 1.1.1.

COPYRIGHT
       Copyright 2017-2019 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
       <https://www.openssl.org/source/license.html>.



1.1.1i                            2019-06-09          RAND_DRBG_get0_master(3)