1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
|
.\" -*- mode: troff; coding: utf-8 -*-
.\" Automatically generated by Pod::Man 5.01 (Pod::Simple 3.43)
.\"
.\" Standard preamble:
.\" ========================================================================
.de Sp \" Vertical space (when we can't use .PP)
.if t .sp .5v
.if n .sp
..
.de Vb \" Begin verbatim text
.ft CW
.nf
.ne \\$1
..
.de Ve \" End verbatim text
.ft R
.fi
..
.\" \*(C` and \*(C' are quotes in nroff, nothing in troff, for use with C<>.
.ie n \{\
. ds C` ""
. ds C' ""
'br\}
.el\{\
. ds C`
. ds C'
'br\}
.\"
.\" Escape single quotes in literal strings from groff's Unicode transform.
.ie \n(.g .ds Aq \(aq
.el .ds Aq '
.\"
.\" If the F register is >0, we'll generate index entries on stderr for
.\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
.\" entries marked with X<> in POD. Of course, you'll have to process the
.\" output yourself in some meaningful fashion.
.\"
.\" Avoid warning from groff about undefined register 'F'.
.de IX
..
.nr rF 0
.if \n(.g .if rF .nr rF 1
.if (\n(rF:(\n(.g==0)) \{\
. if \nF \{\
. de IX
. tm Index:\\$1\t\\n%\t"\\$2"
..
. if !\nF==2 \{\
. nr % 0
. nr F 2
. \}
. \}
.\}
.rr rF
.\" ========================================================================
.\"
.IX Title "RAND_GET0_PRIMARY 3SSL"
.TH RAND_GET0_PRIMARY 3SSL 2024-02-03 3.1.5 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_get0_primary,
RAND_get0_public,
RAND_get0_private,
RAND_set0_public,
RAND_set0_private
\&\- get access to the global EVP_RAND_CTX instances
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/rand.h>
\&
\& EVP_RAND_CTX *RAND_get0_primary(OSSL_LIB_CTX *ctx);
\& EVP_RAND_CTX *RAND_get0_public(OSSL_LIB_CTX *ctx);
\& EVP_RAND_CTX *RAND_get0_private(OSSL_LIB_CTX *ctx);
\& int RAND_set0_public(OSSL_LIB_CTX *ctx, EVP_RAND_CTX *rand);
\& int RAND_set0_private(OSSL_LIB_CTX *ctx, EVP_RAND_CTX *rand);
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
The default RAND API implementation (\fBRAND_OpenSSL()\fR) utilizes three
shared DRBG instances which are accessed via the RAND API:
.PP
The \fIpublic\fR and \fIprivate\fR DRBG are thread-local instances, which are used
by \fBRAND_bytes()\fR and \fBRAND_priv_bytes()\fR, respectively.
The \fIprimary\fR DRBG is a global instance, which is not intended to be used
directly, but is used internally to reseed the other two instances.
.PP
The three get functions provide access to the shared DRBG instances.
.PP
The two set functions allow the public and private DRBG instances to be
replaced by another random number generator.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBRAND_get0_primary()\fR returns a pointer to the \fIprimary\fR DRBG instance
for the given OSSL_LIB_CTX \fBctx\fR.
.PP
\&\fBRAND_get0_public()\fR returns a pointer to the \fIpublic\fR DRBG instance
for the given OSSL_LIB_CTX \fBctx\fR.
.PP
\&\fBRAND_get0_private()\fR returns a pointer to the \fIprivate\fR DRBG instance
for the given OSSL_LIB_CTX \fBctx\fR.
.PP
\&\fBRAND_set0_public()\fR and \fBRAND_set0_private()\fR return 1 on success and 0
on error.
.SH NOTES
.IX Header "NOTES"
It is not thread-safe to access the \fIprimary\fR DRBG instance.
The \fIpublic\fR and \fIprivate\fR DRBG instance can be accessed safely, because
they are thread-local. Note however, that changes to these two instances
apply only to the current thread.
.PP
For that reason it is recommended not to change the settings of these
three instances directly.
Instead, an application should change the default settings for new DRBG instances
at initialization time, before creating additional threads.
.PP
During initialization, it is possible to change the reseed interval
and reseed time interval.
It is also possible to exchange the reseeding callbacks entirely.
.PP
To set the type of DRBG that will be instantiated, use the
\&\fBRAND_set_DRBG_type\fR\|(3) call before accessing the random number generation
infrastructure.
.PP
The two set functions, operate on the the current thread. If you want to
use the same random number generator across all threads, each thread
must individually call the set functions.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBEVP_RAND\fR\|(3),
\&\fBRAND_set_DRBG_type\fR\|(3)
.SH HISTORY
.IX Header "HISTORY"
\&\fBRAND_set0_public()\fR and \fBRAND_set0_private()\fR were added in OpenSSL 3.1.
.PP
The remaining functions were added in OpenSSL 3.0.
.SH COPYRIGHT
.IX Header "COPYRIGHT"
Copyright 2020\-2022 The OpenSSL Project Authors. All Rights Reserved.
.PP
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
<https://www.openssl.org/source/license.html>.
|
