

 
Manual Reference Pages  SSL_CTX_SET1_CURVES (3)
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NAME
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
CONTENTS
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);
DESCRIPTION
SSL_CTX_set1_curves() sets the supported curves for ctx to clistlen
curves in the array 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 ctx to
string list. The string is a colon separated list of curve NIDs or
names, for example P521:P384:P256.
SSL_set1_curves() and SSL_set1_curves_list() are similar except they set
supported curves for the SSL structure 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 curves parameter can be NULL to simply
return the number of curves for memory allocation purposes. The
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
extension.
SSL_get_shared_curve() returns shared curve n for a serverside
SSL ssl. If 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 n is normally set to zero. If the value n is out of range,
NID_undef is returned.
All these functions are implemented as macros.
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.
RETURN VALUES
SSL_CTX_set1_curves(), SSL_CTX_set1_curves_list(), SSL_set1_curves() and
SSL_set1_curves_list(), 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 n or NID_undef if there
is no shared curve n; or the total number of shared curves if n
is 1.
When called on a client ssl, SSL_get_shared_curve() has no meaning and
returns 1.
SEE ALSO
SSL_CTX_add_extra_chain_cert(3)
HISTORY
These functions were first added to OpenSSL 1.0.2.
1.1.0pre3  SSL_CTX_SET1_CURVES (3)  20160215 
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