=pod
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=head1 NAME
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RAND_DRBG_set_ex_data,
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RAND_DRBG_get_ex_data,
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RAND_DRBG_get_ex_new_index
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- store and retrieve extra data from the DRBG instance
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=head1 SYNOPSIS
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#include <openssl/rand_drbg.h>
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int RAND_DRBG_set_ex_data(RAND_DRBG *drbg, int idx, void *data);
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void *RAND_DRBG_get_ex_data(const RAND_DRBG *drbg, int idx);
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int RAND_DRBG_get_ex_new_index(long argl, void *argp,
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CRYPTO_EX_new *new_func,
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CRYPTO_EX_dup *dup_func,
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CRYPTO_EX_free *free_func);
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=head1 DESCRIPTION
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RAND_DRBG_set_ex_data() enables an application to store arbitrary application
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specific data B<data> in a RAND_DRBG instance B<drbg>. The index B<idx> should
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be a value previously returned from a call to RAND_DRBG_get_ex_new_index().
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RAND_DRBG_get_ex_data() retrieves application specific data previously stored
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in an RAND_DRBG instance B<drbg>. The B<idx> value should be the same as that
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used when originally storing the data.
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For more detailed information see L<CRYPTO_get_ex_data(3)> and
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L<CRYPTO_set_ex_data(3)> which implement these functions and
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L<CRYPTO_get_ex_new_index(3)> for generating a unique index.
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=head1 RETURN VALUES
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RAND_DRBG_set_ex_data() returns 1 for success or 0 for failure.
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RAND_DRBG_get_ex_data() returns the previously stored value or NULL on
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failure. NULL may also be a valid value.
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=head1 NOTES
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RAND_DRBG_get_ex_new_index(...) is implemented as a macro and equivalent to
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CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DRBG,...).
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=head1 SEE ALSO
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L<CRYPTO_get_ex_data(3)>,
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L<CRYPTO_set_ex_data(3)>,
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L<CRYPTO_get_ex_new_index(3)>,
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L<RAND_DRBG(7)>
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=head1 COPYRIGHT
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Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the OpenSSL license (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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