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+.\" **************************************************************************
+.\" * _ _ ____ _
+.\" * Project ___| | | | _ \| |
+.\" * / __| | | | |_) | |
+.\" * | (__| |_| | _ <| |___
+.\" * \___|\___/|_| \_\_____|
+.\" *
+.\" * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" *
+.\" * This software is licensed as described in the file COPYING, which
+.\" * you should have received as part of this distribution. The terms
+.\" * are also available at https://curl.haxx.se/docs/copyright.html.
+.\" *
+.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+.\" * copies of the Software, and permit persons to whom the Software is
+.\" * furnished to do so, under the terms of the COPYING file.
+.\" *
+.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+.\" * KIND, either express or implied.
+.\" *
+.\" **************************************************************************
+.\"
+.TH CURLOPT_SSL_EC_CURVES 3 "August 29, 2020" "libcurl 7.73.0" "curl_easy_setopt options"
+
+.SH NAME
+CURLOPT_SSL_EC_CURVES \- set key exchange curves
+.SH SYNOPSIS
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSL_EC_CURVES, char *alg_list);
+.SH DESCRIPTION
+Pass a string as parameter with a colon delimited list of (EC) algorithms. This
+option defines the client's key exchange algorithms in the SSL handshake (if
+the SSL backend libcurl is built to use supports it).
+.SH DEFAULT
+"", embedded in SSL backend
+.SH PROTOCOLS
+HTTP
+.SH EXAMPLE
+.nf
+CURL *curl = curl_easy_init();
+if(curl) {
+ curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
+ curl_easy_setopt(curl, CURLOPT_SSL_EC_CURVES, "X25519:P-521");
+ ret = curl_easy_perform(curl);
+ curl_easy_cleanup(curl);
+}
+.fi
+.SH AVAILABILITY
+Added in 7.73.0. Supported by the OpenSSL backend.
+.SH RETURN VALUE
+Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
+.SH "SEE ALSO"
+.BR CURLOPT_SSL_OPTIONS "(3), " CURLOPT_SSL_CIPHER_LIST "(3), "
+.BR CURLOPT_TLS13_CIPHERS "(3), "