curves.md (815B)
1 --- 2 c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. 3 SPDX-License-Identifier: curl 4 Long: curves 5 Arg: <list> 6 Help: (EC) TLS key exchange algorithms to request 7 Protocols: TLS 8 Added: 7.73.0 9 Category: tls 10 Multi: single 11 See-also: 12 - ciphers 13 Example: 14 - --curves X25519 $URL 15 --- 16 17 # `--curves` 18 19 Set specific curves to use during SSL session establishment according to RFC 20 8422, 5.1. Multiple algorithms can be provided by separating them with `:` 21 (e.g. `X25519:P-521`). The parameter is available identically in the OpenSSL 22 `s_client` and `s_server` utilities. 23 24 --curves allows a OpenSSL powered curl to make SSL-connections with exactly 25 the (EC) curve requested by the client, avoiding nontransparent client/server 26 negotiations. 27 28 If this option is set, the default curves list built into OpenSSL are ignored.