-=pod
-
-=head1 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
-
-=head1 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);
-
-
-
-=head1 DESCRIPTION
-
-RAND_DRBG_set_ex_data() enables an application to store arbitrary application
-specific data B<data> in a RAND_DRBG instance B<drbg>. The index B<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 B<drbg>. The B<idx> value should be the same as that
-used when originally storing the data.
-
-For more detailed information see L<CRYPTO_get_ex_data(3)> and
-L<CRYPTO_set_ex_data(3)> which implement these functions and
-L<CRYPTO_get_ex_new_index(3)> for generating a unique index.
-
-=head1 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.
-
-
-=head1 NOTES
-
-RAND_DRBG_get_ex_new_index(...) is implemented as a macro and equivalent to
-CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DRBG,...).
-
-=head1 SEE ALSO
-
-L<CRYPTO_get_ex_data(3)>,
-L<CRYPTO_set_ex_data(3)>,
-L<CRYPTO_get_ex_new_index(3)>,
-L<RAND_DRBG(7)>
-
-=head1 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
-L<https://www.openssl.org/source/license.html>.
-
-=cut