The s_server/s_client manual describes how to display all curves:
For a list of all curves, use:
$ openssl ecparam -list_curves
But -list_curves only gives the standard built-in curves that use EC parameter files and doesn’t display X25519 and X448 curves.
The default curves group for s_server is X25519:P-256:X448:P-521:P-384, so all this curves should be possible to display.
A rationale for the output of openssl ecparam was discussed in #5232.
The s_server/s_client manual describes how to display all curves:
But
-list_curvesonly gives the standard built-in curves that use EC parameter files and doesn’t display X25519 and X448 curves.The default curves group for s_server is
X25519:P-256:X448:P-521:P-384, so all this curves should be possible to display.A rationale for the output of
openssl ecparamwas discussed in #5232.