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135 .IX Title "RAND_DRBG_SET_EX_DATA 3"
136 .TH RAND_DRBG_SET_EX_DATA 3 "2021-03-25" "1.1.1k" "OpenSSL"
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142 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
144 .IX Header "SYNOPSIS"
146 \& #include <openssl/rand_drbg.h>
148 \& int RAND_DRBG_set_ex_data(RAND_DRBG *drbg, int idx, void *data);
150 \& void *RAND_DRBG_get_ex_data(const RAND_DRBG *drbg, int idx);
152 \& int RAND_DRBG_get_ex_new_index(long argl, void *argp,
153 \& CRYPTO_EX_new *new_func,
154 \& CRYPTO_EX_dup *dup_func,
155 \& CRYPTO_EX_free *free_func);
158 .IX Header "DESCRIPTION"
159 \&\fBRAND_DRBG_set_ex_data()\fR enables an application to store arbitrary application
160 specific data \fBdata\fR in a \s-1RAND_DRBG\s0 instance \fBdrbg\fR. The index \fBidx\fR should
161 be a value previously returned from a call to \fBRAND_DRBG_get_ex_new_index()\fR.
163 \&\fBRAND_DRBG_get_ex_data()\fR retrieves application specific data previously stored
164 in an \s-1RAND_DRBG\s0 instance \fBdrbg\fR. The \fBidx\fR value should be the same as that
165 used when originally storing the data.
167 For more detailed information see \fBCRYPTO_get_ex_data\fR\|(3) and
168 \&\fBCRYPTO_set_ex_data\fR\|(3) which implement these functions and
169 \&\fBCRYPTO_get_ex_new_index\fR\|(3) for generating a unique index.
171 .IX Header "RETURN VALUES"
172 \&\fBRAND_DRBG_set_ex_data()\fR returns 1 for success or 0 for failure.
174 \&\fBRAND_DRBG_get_ex_data()\fR returns the previously stored value or \s-1NULL\s0 on
175 failure. \s-1NULL\s0 may also be a valid value.
178 RAND_DRBG_get_ex_new_index(...) is implemented as a macro and equivalent to
179 CRYPTO_get_ex_new_index(\s-1CRYPTO_EX_INDEX_DRBG,...\s0).
181 .IX Header "SEE ALSO"
182 \&\fBCRYPTO_get_ex_data\fR\|(3),
183 \&\fBCRYPTO_set_ex_data\fR\|(3),
184 \&\fBCRYPTO_get_ex_new_index\fR\|(3),
185 \&\s-1\fBRAND_DRBG\s0\fR\|(7)
187 .IX Header "COPYRIGHT"
188 Copyright 2017\-2018 The OpenSSL Project Authors. All Rights Reserved.
190 Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use
191 this file except in compliance with the License. You can obtain a copy
192 in the file \s-1LICENSE\s0 in the source distribution or at
193 <https://www.openssl.org/source/license.html>.