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
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
|
.\" Automatically generated by Pod::Man 4.09 (Pod::Simple 3.35)
.\"
.\" 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
..
.\" Set up some character translations and predefined strings. \*(-- will
.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left
.\" double quote, and \*(R" will give a right double quote. \*(C+ will
.\" give a nicer C++. Capital omega is used to do unbreakable dashes and
.\" therefore won't be available. \*(C` and \*(C' expand to `' in nroff,
.\" nothing in troff, for use with C<>.
.tr \(*W-
.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
.ie n \{\
. ds -- \(*W-
. ds PI pi
. if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch
. if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch
. ds L" ""
. ds R" ""
. ds C` ""
. ds C' ""
'br\}
.el\{\
. ds -- \|\(em\|
. ds PI \(*p
. ds L" ``
. ds R" ''
. 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
..
.if !\nF .nr F 0
.if \nF>0 \{\
. de IX
. tm Index:\\$1\t\\n%\t"\\$2"
..
. if !\nF==2 \{\
. nr % 0
. nr F 2
. \}
.\}
.\"
.\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
.\" Fear. Run. Save yourself. No user-serviceable parts.
. \" fudge factors for nroff and troff
.if n \{\
. ds #H 0
. ds #V .8m
. ds #F .3m
. ds #[ \f1
. ds #] \fP
.\}
.if t \{\
. ds #H ((1u-(\\\\n(.fu%2u))*.13m)
. ds #V .6m
. ds #F 0
. ds #[ \&
. ds #] \&
.\}
. \" simple accents for nroff and troff
.if n \{\
. ds ' \&
. ds ` \&
. ds ^ \&
. ds , \&
. ds ~ ~
. ds /
.\}
.if t \{\
. ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u"
. ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u'
. ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u'
. ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u'
. ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u'
. ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u'
.\}
. \" troff and (daisy-wheel) nroff accents
.ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V'
.ds 8 \h'\*(#H'\(*b\h'-\*(#H'
.ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#]
.ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H'
.ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u'
.ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#]
.ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#]
.ds ae a\h'-(\w'a'u*4/10)'e
.ds Ae A\h'-(\w'A'u*4/10)'E
. \" corrections for vroff
.if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u'
.if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u'
. \" for low resolution devices (crt and lpr)
.if \n(.H>23 .if \n(.V>19 \
\{\
. ds : e
. ds 8 ss
. ds o a
. ds d- d\h'-1'\(ga
. ds D- D\h'-1'\(hy
. ds th \o'bp'
. ds Th \o'LP'
. ds ae ae
. ds Ae AE
.\}
.rm #[ #] #H #V #F C
.\" ========================================================================
.\"
.IX Title "SSL_CTX_SET1_CURVES 3"
.TH SSL_CTX_SET1_CURVES 3 "2018-11-20" "1.1.1a" "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"
SSL_CTX_set1_groups, SSL_CTX_set1_groups_list, SSL_set1_groups, SSL_set1_groups_list, SSL_get1_groups, SSL_get_shared_group, SSL_CTX_set1_curves, SSL_CTX_set1_curves_list, SSL_set1_curves, SSL_set1_curves_list, SSL_get1_curves, SSL_get_shared_curve \&\- EC supported curve functions
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/ssl.h>
\&
\& int SSL_CTX_set1_groups(SSL_CTX *ctx, int *glist, int glistlen);
\& int SSL_CTX_set1_groups_list(SSL_CTX *ctx, char *list);
\&
\& int SSL_set1_groups(SSL *ssl, int *glist, int glistlen);
\& int SSL_set1_groups_list(SSL *ssl, char *list);
\&
\& int SSL_get1_groups(SSL *ssl, int *groups);
\& int SSL_get_shared_group(SSL *s, int n);
\&
\& int SSL_CTX_set1_curves(SSL_CTX *ctx, int *clist, int clistlen);
\& int SSL_CTX_set1_curves_list(SSL_CTX *ctx, char *list);
\&
\& int SSL_set1_curves(SSL *ssl, int *clist, int clistlen);
\& int SSL_set1_curves_list(SSL *ssl, char *list);
\&
\& int SSL_get1_curves(SSL *ssl, int *curves);
\& int SSL_get_shared_curve(SSL *s, int n);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
For all of the functions below that set the supported groups there must be at
least one group in the list.
.PP
\&\fISSL_CTX_set1_groups()\fR sets the supported groups for \fBctx\fR to \fBglistlen\fR
groups in the array \fBglist\fR. The array consist of all NIDs of groups in
preference order. For a \s-1TLS\s0 client the groups are used directly in the
supported groups extension. For a \s-1TLS\s0 server the groups are used to
determine the set of shared groups.
.PP
\&\fISSL_CTX_set1_groups_list()\fR sets the supported groups for \fBctx\fR to
string \fBlist\fR. The string is a colon separated list of group NIDs or
names, for example \*(L"P\-521:P\-384:P\-256\*(R".
.PP
\&\fISSL_set1_groups()\fR and \fISSL_set1_groups_list()\fR are similar except they set
supported groups for the \s-1SSL\s0 structure \fBssl\fR.
.PP
\&\fISSL_get1_groups()\fR returns the set of supported groups sent by a client
in the supported groups extension. It returns the total number of
supported groups. The \fBgroups\fR parameter can be \fB\s-1NULL\s0\fR to simply
return the number of groups for memory allocation purposes. The
\&\fBgroups\fR array is in the form of a set of group NIDs in preference
order. It can return zero if the client did not send a supported groups
extension.
.PP
\&\fISSL_get_shared_group()\fR returns shared group \fBn\fR for a server-side
\&\s-1SSL\s0 \fBssl\fR. If \fBn\fR is \-1 then the total number of shared groups is
returned, which may be zero. Other than for diagnostic purposes,
most applications will only be interested in the first shared group
so \fBn\fR is normally set to zero. If the value \fBn\fR is out of range,
NID_undef is returned.
.PP
All these functions are implemented as macros.
.PP
The curve functions are synonyms for the equivalently named group functions and
are identical in every respect. They exist because, prior to \s-1TLS1.3,\s0 there was
only the concept of supported curves. In \s-1TLS1.3\s0 this was renamed to supported
groups, and extended to include Diffie Hellman groups. The group functions
should be used in preference.
.SH "NOTES"
.IX Header "NOTES"
If an application wishes to make use of several of these functions for
configuration purposes either on a command line or in a file it should
consider using the \s-1SSL_CONF\s0 interface instead of manually parsing options.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fISSL_CTX_set1_groups()\fR, \fISSL_CTX_set1_groups_list()\fR, \fISSL_set1_groups()\fR and
\&\fISSL_set1_groups_list()\fR, return 1 for success and 0 for failure.
.PP
\&\fISSL_get1_groups()\fR returns the number of groups, which may be zero.
.PP
\&\fISSL_get_shared_group()\fR returns the \s-1NID\s0 of shared group \fBn\fR or NID_undef if there
is no shared group \fBn\fR; or the total number of shared groups if \fBn\fR
is \-1.
.PP
When called on a client \fBssl\fR, \fISSL_get_shared_group()\fR has no meaning and
returns \-1.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fISSL_CTX_add_extra_chain_cert\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
The curve functions were first added to OpenSSL 1.0.2. The equivalent group
functions were first added to OpenSSL 1.1.1.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2013\-2018 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>.
|
