curl-w32/docs/libcurl/opts/CURLOPT_SSL_EC_CURVES.md

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---
c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
SPDX-License-Identifier: curl
Title: CURLOPT_SSL_EC_CURVES
Section: 3
Source: libcurl
See-also:
- CURLOPT_SSL_CIPHER_LIST (3)
- CURLOPT_SSL_OPTIONS (3)
- CURLOPT_TLS13_CIPHERS (3)
---
# NAME
CURLOPT_SSL_EC_CURVES - key exchange curves
# SYNOPSIS
~~~c
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSL_EC_CURVES, char *alg_list);
~~~
# 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).
# DEFAULT
"", embedded in SSL backend
# PROTOCOLS
HTTP
# EXAMPLE
~~~c
int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
CURLcode res;
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
curl_easy_setopt(curl, CURLOPT_SSL_EC_CURVES, "X25519:P-521");
res = curl_easy_perform(curl);
curl_easy_cleanup(curl);
}
}
~~~
# AVAILABILITY
Added in 7.73.0. Supported by the OpenSSL backend.
# RETURN VALUE
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.