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- c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
- SPDX-License-Identifier: curl
- Long: curves
- Arg: <algorithm list>
- Help: (EC) TLS key exchange algorithm(s) to request
- Protocols: TLS
- Added: 7.73.0
- Category: tls
- Example: --curves X25519 $URL
- See-also: ciphers
- Multi: single
- ---
- Tells curl to request 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/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 will be
- ignored.
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