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The syntax of B<value> is identical to B<-sigalgs>. If not set then

the value set for B<-sigalgs> will be used instead.

=item B<-curves>

This sets the supported elliptic curves. For clients the curves are

sent using the supported curves extension. For servers it is used

to determine which curve to use. This setting affects curves used for both

signatures and key exchange, if applicable.

The B<value> argument is a colon separated list of curves. The curve can be

either the B<NIST> name (e.g. B<P-256>) or an OpenSSL OID name (e.g

B<prime256v1>). Curve names are case sensitive.

=item B<-groups>

This sets the supported groups. For clients, the groups are