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-=head1 NAME
-SSL_CTX_set1_curves, SSL_CTX_set1_curves_list, SSL_set1_curves,
-SSL_set1_curves_list, SSL_get1_curves, SSL_get_shared_curve,
-SSL_CTX_set_ecdh_auto, SSL_set_ecdh_auto - EC supported curve functions
-=head1 SYNOPSIS
- #include <openssl/ssl.h>
- 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);
- int SSL_CTX_set_ecdh_auto(SSL_CTX *ctx, int onoff);
- int SSL_set_ecdh_auto(SSL *s, int onoff);
-SSL_CTX_set1_curves() sets the supported curves for B<ctx> to B<clistlen>
-curves in the array B<clist>. The array consist of all NIDs of curves in
-preference order. For a TLS client the curves are used directly in the
-supported curves extension. For a TLS server the curves are used to
-determine the set of shared curves.
-SSL_CTX_set1_curves_list() sets the supported curves for B<ctx> to
-string B<list>. The string is a colon separated list of curve NIDs or
-names, for example "P-521:P-384:P-256".
-SSL_set1_curves() and SSL_set1_curves_list() are similar except they set
-supported curves for the SSL structure B<ssl>.
-SSL_get1_curves() returns the set of supported curves sent by a client
-in the supported curves extension. It returns the total number of
-supported curves. The B<curves> parameter can be B<NULL> to simply
-return the number of curves for memory allocation purposes. The
-B<curves> array is in the form of a set of curve NIDs in preference
-order. It can return zero if the client did not send a supported curves
-SSL_get_shared_curve() returns shared curve B<n> for a server-side
-SSL B<ssl>. If B<n> is -1 then the total number of shared curves is
-returned, which may be zero. Other than for diagnostic purposes,
-most applications will only be interested in the first shared curve
-so B<n> is normally set to zero. If the value B<n> is out of range,
-NID_undef is returned.
-SSL_CTX_set_ecdh_auto() and SSL_set_ecdh_auto() set automatic curve
-selection for server B<ctx> or B<ssl> to B<onoff>. If B<onoff> is 1 then
-the highest preference curve is automatically used for ECDH temporary
-keys used during key exchange.
-All these functions are implemented as macros.
-=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.
-The functions SSL_CTX_set_ecdh_auto() and SSL_set_ecdh_auto() can be used to
-make a server always choose the most appropriate curve for a client. If set
-it will override any temporary ECDH parameters set by a server. Previous
-versions of OpenSSL could effectively only use a single ECDH curve set
-using a function such as SSL_CTX_set_ecdh_tmp(). Newer applications should
-just call:
- SSL_CTX_set_ecdh_auto(ctx, 1);
-and they will automatically support ECDH using the most appropriate shared
-SSL_CTX_set1_curves(), SSL_CTX_set1_curves_list(), SSL_set1_curves(),
-SSL_set1_curves_list(), SSL_CTX_set_ecdh_auto() and SSL_set_ecdh_auto()
-return 1 for success and 0 for failure.
-SSL_get1_curves() returns the number of curves, which may be zero.
-SSL_get_shared_curve() returns the NID of shared curve B<n> or NID_undef if there
-is no shared curve B<n>; or the total number of shared curves if B<n>
-is -1.
-When called on a client B<ssl>, SSL_get_shared_curve() has no meaning and
-returns -1.
-=head1 SEE ALSO
-=head1 HISTORY
-These functions were first added to OpenSSL 1.0.2.