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NAME

       RAND_DRBG_set_ex_data, RAND_DRBG_get_ex_data, RAND_DRBG_get_ex_new_index - store and
       retrieve extra data from the DRBG instance

SYNOPSIS

        #include <openssl/rand_drbg.h>

        int RAND_DRBG_set_ex_data(RAND_DRBG *drbg, int idx, void *data);

        void *RAND_DRBG_get_ex_data(const RAND_DRBG *drbg, int idx);

        int RAND_DRBG_get_ex_new_index(long argl, void *argp,
                                       CRYPTO_EX_new *new_func,
                                       CRYPTO_EX_dup *dup_func,
                                       CRYPTO_EX_free *free_func);

DESCRIPTION

       RAND_DRBG_set_ex_data() enables an application to store arbitrary application specific
       data data in a RAND_DRBG instance drbg. The index idx should be a value previously
       returned from a call to RAND_DRBG_get_ex_new_index().

       RAND_DRBG_get_ex_data() retrieves application specific data previously stored in an
       RAND_DRBG instance drbg. The idx value should be the same as that used when originally
       storing the data.

       For more detailed information see CRYPTO_get_ex_data(3) and CRYPTO_set_ex_data(3) which
       implement these functions and CRYPTO_get_ex_new_index(3) for generating a unique index.

RETURN VALUES

       RAND_DRBG_set_ex_data() returns 1 for success or 0 for failure.

       RAND_DRBG_get_ex_data() returns the previously stored value or NULL on failure. NULL may
       also be a valid value.

NOTES

       RAND_DRBG_get_ex_new_index(...) is implemented as a macro and equivalent to
       CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DRBG,...).

SEE ALSO

       CRYPTO_get_ex_data(3), CRYPTO_set_ex_data(3), CRYPTO_get_ex_new_index(3), RAND_DRBG(7)

COPYRIGHT

       Copyright 2017-2018 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>.