1 .\" $OpenBSD: SSL_CTX_set1_groups.3,v 1.2 2017/08/19 19:36:39 schwarze Exp $
2 .\" OpenSSL SSL_CTX_set1_curves.pod de4d764e Nov 9 14:51:06 2016 +0000
4 .\" This file was written by Dr. Stephen Henson <steve@openssl.org>.
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51 .Dd $Mdocdate: August 19 2017 $
52 .Dt SSL_CTX_SET1_GROUPS 3
55 .Nm SSL_CTX_set1_groups ,
56 .Nm SSL_CTX_set1_groups_list ,
58 .Nm SSL_set1_groups_list ,
59 .Nm SSL_CTX_set1_curves ,
60 .Nm SSL_CTX_set1_curves_list ,
62 .Nm SSL_set1_curves_list
63 .Nd choose supported EC groups
67 .Fo SSL_CTX_set1_groups
69 .Fa "const int *glist"
73 .Fo SSL_CTX_set1_groups_list
75 .Fa "const char *list"
80 .Fa "const int *glist"
84 .Fo SSL_set1_groups_list
86 .Fa "const char *list"
89 .Fo SSL_CTX_set1_curves
91 .Fa "const int *clist"
95 .Fo SSL_CTX_set1_curves_list
97 .Fa "const char *list"
102 .Fa "const int *clist"
103 .Fa "size_t clistlen"
106 .Fo SSL_set1_curves_list
108 .Fa "const char *list"
111 .Fn SSL_CTX_set1_groups
112 sets the supported groups for
118 The array consists of group NIDs in preference order.
119 For a TLS client, the groups are used directly in the supported groups
121 For a TLS server, the groups are used to determine the set of shared
124 .Fn SSL_CTX_set1_groups_list
125 sets the supported groups for
129 represented as a colon separated list of group NIDs or names, for example
134 .Fn SSL_set1_groups_list
135 are similar except that they set supported groups for the SSL structure
139 The curve functions are deprecated synonyms for the equivalently
140 named group functions and are identical in every respect except
141 that they are implemented as macros.
142 They exist because prior to TLS1.3, there was only the concept of
144 In TLS1.3, this was renamed to supported groups and extended to include
145 Diffie Hellman groups.
147 If an application wishes to make use of several of these functions for
148 configuration purposes either on a command line or in a file, it should
149 consider using the SSL_CONF interface instead of manually parsing
152 All these functions return 1 for success or 0 for failure.
155 .Xr SSL_CTX_add_extra_chain_cert 3 ,
156 .Xr SSL_CTX_set_cipher_list 3 ,
157 .Xr SSL_CTX_set_options 3 ,
160 The curve functions first appeared in OpenSSL 1.0.2
161 and the group functions in OpenSSL 1.1.1.
162 Both have been available since