1--- 2c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. 3SPDX-License-Identifier: curl 4Title: CURLOPT_SSL_EC_CURVES 5Section: 3 6Source: libcurl 7See-also: 8 - CURLOPT_SSL_CIPHER_LIST (3) 9 - CURLOPT_SSL_OPTIONS (3) 10 - CURLOPT_TLS13_CIPHERS (3) 11Protocol: 12 - TLS 13TLS-backend: 14 - OpenSSL 15 - wolfSSL 16--- 17 18# NAME 19 20CURLOPT_SSL_EC_CURVES - key exchange curves 21 22# SYNOPSIS 23 24~~~c 25#include <curl/curl.h> 26 27CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSL_EC_CURVES, char *alg_list); 28~~~ 29 30# DESCRIPTION 31 32Pass a string as parameter with a colon delimited list of (EC) algorithms. This 33option defines the client's key exchange algorithms in the SSL handshake (if 34the SSL backend libcurl is built to use supports it). 35 36# DEFAULT 37 38"", embedded in SSL backend 39 40# EXAMPLE 41 42~~~c 43int main(void) 44{ 45 CURL *curl = curl_easy_init(); 46 if(curl) { 47 CURLcode res; 48 curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/"); 49 curl_easy_setopt(curl, CURLOPT_SSL_EC_CURVES, "X25519:P-521"); 50 res = curl_easy_perform(curl); 51 curl_easy_cleanup(curl); 52 } 53} 54~~~ 55 56# AVAILABILITY 57 58Added in 7.73.0. Supported by the OpenSSL backend. 59 60# RETURN VALUE 61 62Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not. 63