forked from cory/tildefriends
Add prebuild OpenSSL, and remove SCHANNEL code and whatever it was on MacOS. Build mingw for 64-bit.
git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@4088 ed5197a5-7fde-0310-b194-c3ffbd925b24
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239
deps/openssl/mingw64/share/man/man3/RAND_DRBG_reseed.3
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.\" ========================================================================
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.\"
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.IX Title "RAND_DRBG_RESEED 3"
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.TH RAND_DRBG_RESEED 3 "2020-04-21" "1.1.1g" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.nh
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.SH "NAME"
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RAND_DRBG_reseed, RAND_DRBG_set_reseed_interval, RAND_DRBG_set_reseed_time_interval, RAND_DRBG_set_reseed_defaults \&\- reseed a RAND_DRBG instance
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/rand_drbg.h>
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\&
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\& int RAND_DRBG_reseed(RAND_DRBG *drbg,
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\& const unsigned char *adin, size_t adinlen,
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\& int prediction_resistance);
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\&
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\& int RAND_DRBG_set_reseed_interval(RAND_DRBG *drbg,
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\& unsigned int interval);
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\&
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\& int RAND_DRBG_set_reseed_time_interval(RAND_DRBG *drbg,
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\& time_t interval);
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\&
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\& int RAND_DRBG_set_reseed_defaults(
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\& unsigned int master_reseed_interval,
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\& unsigned int slave_reseed_interval,
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\& time_t master_reseed_time_interval,
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\& time_t slave_reseed_time_interval
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\& );
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fBRAND_DRBG_reseed()\fR
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reseeds the given \fBdrbg\fR, obtaining entropy input from its entropy source
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and mixing in the specified additional data provided in the buffer \fBadin\fR
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of length \fBadinlen\fR.
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The additional data can be omitted by setting \fBadin\fR to \s-1NULL\s0 and \fBadinlen\fR
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to 0.
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An immediate reseeding from a live entropy source can be requested by setting
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the \fBprediction_resistance\fR flag to 1.
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This feature is not implemented yet, so reseeding with prediction resistance
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requested will always fail.
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.PP
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\&\fBRAND_DRBG_set_reseed_interval()\fR
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sets the reseed interval of the \fBdrbg\fR, which is the maximum allowed number
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of generate requests between consecutive reseedings.
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If \fBinterval\fR > 0, then the \fBdrbg\fR will reseed automatically whenever the
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number of generate requests since its last seeding exceeds the given reseed
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interval.
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If \fBinterval\fR == 0, then this feature is disabled.
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.PP
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\&\fBRAND_DRBG_set_reseed_time_interval()\fR
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sets the reseed time interval of the \fBdrbg\fR, which is the maximum allowed
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number of seconds between consecutive reseedings.
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If \fBinterval\fR > 0, then the \fBdrbg\fR will reseed automatically whenever the
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elapsed time since its last reseeding exceeds the given reseed time interval.
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If \fBinterval\fR == 0, then this feature is disabled.
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.PP
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\&\fBRAND_DRBG_set_reseed_defaults()\fR sets the default values for the reseed interval
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(\fBmaster_reseed_interval\fR and \fBslave_reseed_interval\fR)
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and the reseed time interval
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(\fBmaster_reseed_time_interval\fR and \fBslave_reseed_tme_interval\fR)
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of \s-1DRBG\s0 instances.
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The default values are set independently for master \s-1DRBG\s0 instances (which don't
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have a parent) and slave \s-1DRBG\s0 instances (which are chained to a parent \s-1DRBG\s0).
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fBRAND_DRBG_reseed()\fR,
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\&\fBRAND_DRBG_set_reseed_interval()\fR, and
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\&\fBRAND_DRBG_set_reseed_time_interval()\fR,
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return 1 on success, 0 on failure.
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.SH "NOTES"
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.IX Header "NOTES"
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The default OpenSSL random generator is already set up for automatic reseeding,
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so in general it is not necessary to reseed it explicitly, or to modify
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its reseeding thresholds.
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.PP
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Normally, the entropy input for seeding a \s-1DRBG\s0 is either obtained from a
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trusted os entropy source or from a parent \s-1DRBG\s0 instance, which was seeded
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(directly or indirectly) from a trusted os entropy source.
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In exceptional cases it is possible to replace the reseeding mechanism entirely
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by providing application defined callbacks using \fBRAND_DRBG_set_callbacks()\fR.
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.PP
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The reseeding default values are applied only during creation of a \s-1DRBG\s0 instance.
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To ensure that they are applied to the global and thread-local \s-1DRBG\s0 instances
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(<master>, resp. <public> and <private>), it is necessary to call
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\&\fBRAND_DRBG_set_reseed_defaults()\fR before creating any thread and before calling any
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cryptographic routines that obtain random data directly or indirectly.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fBRAND_DRBG_generate\fR\|(3),
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\&\fBRAND_DRBG_bytes\fR\|(3),
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\&\fBRAND_DRBG_set_callbacks\fR\|(3).
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\&\s-1\fBRAND_DRBG\s0\fR\|(7)
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.SH "HISTORY"
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.IX Header "HISTORY"
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The \s-1RAND_DRBG\s0 functions were added in OpenSSL 1.1.1.
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2017\-2019 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the OpenSSL license (the \*(L"License\*(R"). 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 \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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