210 lines
7.1 KiB
Groff
Executable File
210 lines
7.1 KiB
Groff
Executable File
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.\" ========================================================================
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.\"
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.IX Title "RAND_DRBG_GENERATE 3"
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.TH RAND_DRBG_GENERATE 3 "2020-03-02" "3.0.0-dev" "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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.if n .ad l
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.nh
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.SH "NAME"
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RAND_DRBG_generate,
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RAND_DRBG_bytes
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\&\- generate random bytes using the given 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_generate(RAND_DRBG *drbg,
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\& unsigned char *out, size_t outlen,
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\& int prediction_resistance,
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\& const unsigned char *adin, size_t adinlen);
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\&
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\& int RAND_DRBG_bytes(RAND_DRBG *drbg,
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\& unsigned char *out, size_t outlen);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fIRAND_DRBG_generate()\fR generates \fBoutlen\fR random bytes using the given
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\&\s-1DRBG\s0 instance \fBdrbg\fR and stores them in the buffer at \fBout\fR.
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.PP
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Before generating the output, the \s-1DRBG\s0 instance checks whether the maximum
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number of generate requests (\fIreseed interval\fR) or the maximum timespan
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(\fIreseed time interval\fR) since its last seeding have been reached.
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If this is the case, the \s-1DRBG\s0 reseeds automatically.
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Additionally, an immediate reseeding can be requested by setting the
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\&\fBprediction_resistance\fR flag to 1.
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Requesting prediction resistance is a relative expensive operation.
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See \s-1NOTES\s0 section for more details.
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.PP
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The caller can optionally provide additional data to be used for reseeding
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by passing a pointer \fBadin\fR to a buffer of length \fBadinlen\fR.
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This additional data is mixed into the internal state of the random
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generator but does not contribute to the entropy count.
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The additional data can be omitted by setting \fBadin\fR to \s-1NULL\s0 and
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\&\fBadinlen\fR to 0;
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.PP
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\&\fIRAND_DRBG_bytes()\fR generates \fBoutlen\fR random bytes using the given
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\&\s-1DRBG\s0 instance \fBdrbg\fR and stores them in the buffer at \fBout\fR.
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This function is a wrapper around the \fIRAND_DRBG_generate()\fR call,
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which collects some additional data from low entropy sources
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(e.g., a high resolution timer) and calls
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RAND_DRBG_generate(drbg, out, outlen, 0, adin, adinlen).
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIRAND_DRBG_generate()\fR and \fIRAND_DRBG_bytes()\fR return 1 on success,
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and 0 on failure.
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.SH "NOTES"
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.IX Header "NOTES"
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The \fIreseed interval\fR and \fIreseed time interval\fR of the \fBdrbg\fR are set to
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reasonable default values, which in general do not have to be adjusted.
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If necessary, they can be changed using \fIRAND_DRBG_set_reseed_interval\fR\|(3)
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and \fIRAND_DRBG_set_reseed_time_interval\fR\|(3), respectively.
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.PP
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A request for prediction resistance can only be satisfied by pulling fresh
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entropy from a live entropy source (section 5.5.2 of [\s-1NIST\s0 \s-1SP\s0 800\-90C]).
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It is up to the user to ensure that a live entropy source is configured
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and is being used.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIRAND_bytes\fR\|(3),
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\&\fIRAND_DRBG_set_reseed_interval\fR\|(3),
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\&\fIRAND_DRBG_set_reseed_time_interval\fR\|(3),
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\&\s-1\fIRAND_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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.PP
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Prediction resistance is supported from OpenSSL 3.0.
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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 Apache License 2.0 (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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