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-.\" ========================================================================
-.\"
-.IX Title "RAND_DRBG_RESEED 3"
-.TH RAND_DRBG_RESEED 3 "2022-07-05" "1.1.1q" "OpenSSL"
-.\" For nroff, turn off justification. Always turn off hyphenation; it makes
-.\" way too many mistakes in technical documents.
-.if n .ad l
-.nh
-.SH "NAME"
-RAND_DRBG_reseed, RAND_DRBG_set_reseed_interval, RAND_DRBG_set_reseed_time_interval, RAND_DRBG_set_reseed_defaults \&\- reseed a RAND_DRBG instance
-.SH "SYNOPSIS"
-.IX Header "SYNOPSIS"
-.Vb 1
-\& #include <openssl/rand_drbg.h>
-\&
-\& int RAND_DRBG_reseed(RAND_DRBG *drbg,
-\& const unsigned char *adin, size_t adinlen,
-\& int prediction_resistance);
-\&
-\& int RAND_DRBG_set_reseed_interval(RAND_DRBG *drbg,
-\& unsigned int interval);
-\&
-\& int RAND_DRBG_set_reseed_time_interval(RAND_DRBG *drbg,
-\& time_t interval);
-\&
-\& int RAND_DRBG_set_reseed_defaults(
-\& unsigned int master_reseed_interval,
-\& unsigned int slave_reseed_interval,
-\& time_t master_reseed_time_interval,
-\& time_t slave_reseed_time_interval
-\& );
-.Ve
-.SH "DESCRIPTION"
-.IX Header "DESCRIPTION"
-\&\fBRAND_DRBG_reseed()\fR
-reseeds the given \fBdrbg\fR, obtaining entropy input from its entropy source
-and mixing in the specified additional data provided in the buffer \fBadin\fR
-of length \fBadinlen\fR.
-The additional data can be omitted by setting \fBadin\fR to \s-1NULL\s0 and \fBadinlen\fR
-to 0.
-An immediate reseeding from a live entropy source can be requested by setting
-the \fBprediction_resistance\fR flag to 1.
-This feature is not implemented yet, so reseeding with prediction resistance
-requested will always fail.
-.PP
-\&\fBRAND_DRBG_set_reseed_interval()\fR
-sets the reseed interval of the \fBdrbg\fR, which is the maximum allowed number
-of generate requests between consecutive reseedings.
-If \fBinterval\fR > 0, then the \fBdrbg\fR will reseed automatically whenever the
-number of generate requests since its last seeding exceeds the given reseed
-interval.
-If \fBinterval\fR == 0, then this feature is disabled.
-.PP
-\&\fBRAND_DRBG_set_reseed_time_interval()\fR
-sets the reseed time interval of the \fBdrbg\fR, which is the maximum allowed
-number of seconds between consecutive reseedings.
-If \fBinterval\fR > 0, then the \fBdrbg\fR will reseed automatically whenever the
-elapsed time since its last reseeding exceeds the given reseed time interval.
-If \fBinterval\fR == 0, then this feature is disabled.
-.PP
-\&\fBRAND_DRBG_set_reseed_defaults()\fR sets the default values for the reseed interval
-(\fBmaster_reseed_interval\fR and \fBslave_reseed_interval\fR)
-and the reseed time interval
-(\fBmaster_reseed_time_interval\fR and \fBslave_reseed_tme_interval\fR)
-of \s-1DRBG\s0 instances.
-The default values are set independently for master \s-1DRBG\s0 instances (which don't
-have a parent) and slave \s-1DRBG\s0 instances (which are chained to a parent \s-1DRBG\s0).
-.SH "RETURN VALUES"
-.IX Header "RETURN VALUES"
-\&\fBRAND_DRBG_reseed()\fR,
-\&\fBRAND_DRBG_set_reseed_interval()\fR, and
-\&\fBRAND_DRBG_set_reseed_time_interval()\fR,
-return 1 on success, 0 on failure.
-.SH "NOTES"
-.IX Header "NOTES"
-The default OpenSSL random generator is already set up for automatic reseeding,
-so in general it is not necessary to reseed it explicitly, or to modify
-its reseeding thresholds.
-.PP
-Normally, the entropy input for seeding a \s-1DRBG\s0 is either obtained from a
-trusted os entropy source or from a parent \s-1DRBG\s0 instance, which was seeded
-(directly or indirectly) from a trusted os entropy source.
-In exceptional cases it is possible to replace the reseeding mechanism entirely
-by providing application defined callbacks using \fBRAND_DRBG_set_callbacks()\fR.
-.PP
-The reseeding default values are applied only during creation of a \s-1DRBG\s0 instance.
-To ensure that they are applied to the global and thread-local \s-1DRBG\s0 instances
-(<master>, resp. <public> and <private>), it is necessary to call
-\&\fBRAND_DRBG_set_reseed_defaults()\fR before creating any thread and before calling any
- cryptographic routines that obtain random data directly or indirectly.
-.SH "SEE ALSO"
-.IX Header "SEE ALSO"
-\&\fBRAND_DRBG_generate\fR\|(3),
-\&\fBRAND_DRBG_bytes\fR\|(3),
-\&\fBRAND_DRBG_set_callbacks\fR\|(3).
-\&\s-1\fBRAND_DRBG\s0\fR\|(7)
-.SH "HISTORY"
-.IX Header "HISTORY"
-The \s-1RAND_DRBG\s0 functions were added in OpenSSL 1.1.1.
-.SH "COPYRIGHT"
-.IX Header "COPYRIGHT"
-Copyright 2017\-2019 The OpenSSL Project Authors. All Rights Reserved.
-.PP
-Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use
-this file except in compliance with the License. You can obtain a copy
-in the file \s-1LICENSE\s0 in the source distribution or at
-<https://www.openssl.org/source/license.html>.