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=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 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
L<https://www.openssl.org/source/license.html>.
=cut
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