metadata
c: Copyright (C) Daniel Stenberg, <[email protected]>, et al.
SPDX-License-Identifier: curl
Long: curves
Arg: <list>
Help: (EC) TLS key exchange algorithms to request
Protocols: TLS
Added: 7.73.0
Category: tls
Multi: single
See-also:
- ciphers
Example:
- '--curves X25519 $URL'
--curves
Set specific curves to use during SSL session establishment according to RFC
8422, 5.1. Multiple algorithms can be provided by separating them with :
(e.g. X25519:P-521). The parameter is available identically in the OpenSSL
s_client and s_server utilities.
--curves allows a OpenSSL powered curl to make SSL-connections with exactly the (EC) curve requested by the client, avoiding nontransparent client/server negotiations.
If this option is set, the default curves list built into OpenSSL are ignored.