NAME

       RAND_set_DRBG_type, RAND_set_seed_source_type - specify the global random number generator
       types

SYNOPSIS

        #include <openssl/rand.h>

        int RAND_set_DRBG_type(OSSL_LIB_CTX *ctx, const char *drbg, const char *propq,
                               const char *cipher, const char *digest);
        int RAND_set_seed_source_type(OSSL_LIB_CTX *ctx, const char *seed,
                                      const char *propq);

DESCRIPTION

       RAND_set_DRBG_type() specifies the random bit generator that will be used within the
       library context ctx.  A generator of name drbg with properties propq will be fetched.  It
       will be instantiated with either cipher or digest as its underlying cryptographic
       algorithm.  This specifies the type that will be used for the primary, public and private
       random instances.

       RAND_set_seed_source_type() specifies the seed source that will be used within the library
       context ctx.  The seed source of name seed with properties propq will be fetched and used
       to seed the primary random big generator.

RETURN VALUES

       These function return 1 on success and 0 on failure.

NOTES

       These functions must be called before the random bit generators are first created in the
       library context.  They will return an error if the call is made too late.

       The default DRBG is "CTR-DRBG" using the "AES-256-CTR" cipher.

       The default seed source is "SEED-SRC".

SEE ALSO

       EVP_RAND(3), RAND_get0_primary(3)

HISTORY

       These functions were added in OpenSSL 3.0.

COPYRIGHT

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