mirror of
https://github.com/openssl/openssl.git
synced 2024-12-27 06:21:43 +08:00
b646179229
Reviewed-by: Neil Horman <nhorman@openssl.org>
Release: yes
(cherry picked from commit 0ce7d1f355)
Reviewed-by: Hugo Landau <hlandau@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/24034)
159 lines
7.0 KiB
Plaintext
159 lines
7.0 KiB
Plaintext
=pod
|
|
|
|
=head1 NAME
|
|
|
|
SSL_CTX_set1_groups, SSL_CTX_set1_groups_list, SSL_set1_groups,
|
|
SSL_set1_groups_list, SSL_get1_groups, SSL_get0_iana_groups,
|
|
SSL_get_shared_group, SSL_get_negotiated_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
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#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_get0_iana_groups(SSL *ssl, uint16_t **out);
|
|
int SSL_get_shared_group(SSL *s, int n);
|
|
int SSL_get_negotiated_group(SSL *s);
|
|
|
|
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);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
For all of the functions below that set the supported groups there must be at
|
|
least one group in the list. A number of these functions identify groups via a
|
|
unique integer NID value. However, support for some groups may be added by
|
|
external providers. In this case there will be no NID assigned for the group.
|
|
When setting such groups applications should use the "list" form of these
|
|
functions (i.e. SSL_CTX_set1_groups_list() and SSL_set1_groups_list).
|
|
|
|
SSL_CTX_set1_groups() sets the supported groups for B<ctx> to B<glistlen>
|
|
groups in the array B<glist>. The array consist of all NIDs of groups in
|
|
preference order. For a TLS client the groups are used directly in the
|
|
supported groups extension. For a TLS server the groups are used to
|
|
determine the set of shared groups. Currently supported groups for
|
|
B<TLSv1.3> are B<NID_X9_62_prime256v1>, B<NID_secp384r1>, B<NID_secp521r1>,
|
|
B<NID_X25519>, B<NID_X448>, B<NID_brainpoolP256r1tls13>,
|
|
B<NID_brainpoolP384r1tls13>, B<NID_brainpoolP512r1tls13>, B<NID_ffdhe2048>,
|
|
B<NID_ffdhe3072>, B<NID_ffdhe4096>, B<NID_ffdhe6144> and B<NID_ffdhe8192>.
|
|
|
|
SSL_CTX_set1_groups_list() sets the supported groups for B<ctx> to
|
|
string B<list>. The string is a colon separated list of group names, for example
|
|
"P-521:P-384:P-256:X25519:ffdhe2048". Currently supported groups for B<TLSv1.3>
|
|
are B<P-256>, B<P-384>, B<P-521>, B<X25519>, B<X448>, B<brainpoolP256r1tls13>,
|
|
B<brainpoolP384r1tls13>, B<brainpoolP512r1tls13>, B<ffdhe2048>, B<ffdhe3072>,
|
|
B<ffdhe4096>, B<ffdhe6144> and B<ffdhe8192>. Support for other groups may be
|
|
added by external providers. If a group name is preceded with the C<?>
|
|
character, it will be ignored if an implementation is missing.
|
|
|
|
SSL_set1_groups() and SSL_set1_groups_list() are similar except they set
|
|
supported groups for the SSL structure B<ssl>.
|
|
|
|
SSL_get1_groups() returns the set of supported groups sent by a client
|
|
in the supported groups extension. It returns the total number of
|
|
supported groups. The B<groups> parameter can be B<NULL> to simply
|
|
return the number of groups for memory allocation purposes. The
|
|
B<groups> 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. If a supported group NID is unknown then the value is set to the
|
|
bitwise OR of TLSEXT_nid_unknown (0x1000000) and the id of the group.
|
|
|
|
SSL_get0_iana_groups() retrieves the list of groups sent by the
|
|
client in the supported_groups extension. The B<*out> array of bytes
|
|
is populated with the host-byte-order representation of the uint16_t group
|
|
identifiers, as assigned by IANA. The group list is returned in the same order
|
|
that was received in the ClientHello. The return value is the number of groups,
|
|
not the number of bytes written.
|
|
|
|
SSL_get_shared_group() returns the NID of the shared group B<n> for a
|
|
server-side SSL B<ssl>. If B<n> 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 B<n> is normally set to zero. If the value B<n> is out of range,
|
|
NID_undef is returned. If the NID for the shared group is unknown then the value
|
|
is set to the bitwise OR of TLSEXT_nid_unknown (0x1000000) and the id of the
|
|
group.
|
|
|
|
SSL_get_negotiated_group() returns the NID of the negotiated group used for
|
|
the handshake key exchange process. For TLSv1.3 connections this typically
|
|
reflects the state of the current connection, though in the case of PSK-only
|
|
resumption, the returned value will be from a previous connection. For earlier
|
|
TLS versions, when a session has been resumed, it always reflects the group
|
|
used for key exchange during the initial handshake (otherwise it is from the
|
|
current, non-resumption, connection). This can be called by either client or
|
|
server. If the NID for the shared group is unknown then the value is set to the
|
|
bitwise OR of TLSEXT_nid_unknown (0x1000000) and the id of the group.
|
|
|
|
All these functions are implemented as macros.
|
|
|
|
The curve functions are synonyms for the equivalently named group functions and
|
|
are identical in every respect. They exist because, prior to TLS1.3, there was
|
|
only the concept of supported curves. In TLS1.3 this was renamed to supported
|
|
groups, and extended to include Diffie Hellman groups. The group functions
|
|
should be used in preference.
|
|
|
|
=head1 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 SSL_CONF interface instead of manually parsing options.
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
SSL_CTX_set1_groups(), SSL_CTX_set1_groups_list(), SSL_set1_groups() and
|
|
SSL_set1_groups_list(), return 1 for success and 0 for failure.
|
|
|
|
SSL_get1_groups() returns the number of groups, which may be zero.
|
|
|
|
SSL_get0_iana_groups() returns the number of (uint16_t) groups, which may be zero.
|
|
|
|
SSL_get_shared_group() returns the NID of shared group B<n> or NID_undef if there
|
|
is no shared group B<n>; or the total number of shared groups if B<n>
|
|
is -1.
|
|
|
|
When called on a client B<ssl>, SSL_get_shared_group() has no meaning and
|
|
returns -1.
|
|
|
|
SSL_get_negotiated_group() returns the NID of the negotiated group used for
|
|
key exchange, or NID_undef if there was no negotiated group.
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<ssl(7)>,
|
|
L<SSL_CTX_add_extra_chain_cert(3)>
|
|
|
|
=head1 HISTORY
|
|
|
|
The curve functions were added in OpenSSL 1.0.2. The equivalent group
|
|
functions were added in OpenSSL 1.1.1. The SSL_get_negotiated_group() function
|
|
was added in OpenSSL 3.0.0.
|
|
|
|
Support for ignoring unknown groups in SSL_CTX_set1_groups_list() and
|
|
SSL_set1_groups_list() was added in OpenSSL 3.3.
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright 2013-2024 The OpenSSL Project Authors. All Rights Reserved.
|
|
|
|
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
|
|
L<https://www.openssl.org/source/license.html>.
|
|
|
|
=cut
|