CURLOPT_SSL_EC_CURVES(3)   curl_easy_setopt options   CURLOPT_SSL_EC_CURVES(3)

NAME
       CURLOPT_SSL_EC_CURVES - set key exchange curves

SYNOPSIS
       #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
       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);
       }

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.

SEE ALSO
       CURLOPT_SSL_OPTIONS(3), CURLOPT_SSL_CIPHER_LIST(3),
       CURLOPT_TLS13_CIPHERS(3),

libcurl 7.77.0                 November 4, 2020       CURLOPT_SSL_EC_CURVES(3)