=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 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 in a RAND_DRBG instance B. The index B 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. The B value should be the same as that used when originally storing the data. For more detailed information see L and L which implement these functions and L 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, L, L, L =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. =cut