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- .\" generated by cd2nroff 0.1 from CURLOPT_SSL_EC_CURVES.md
- .TH CURLOPT_SSL_EC_CURVES 3 "2025-01-17" libcurl
- .SH NAME
- CURLOPT_SSL_EC_CURVES \- key exchange curves
- .SH SYNOPSIS
- .nf
- #include <curl/curl.h>
- CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSL_EC_CURVES, char *alg_list);
- .fi
- .SH DESCRIPTION
- Pass a string as parameter with a colon delimited list of (EC) algorithms. This
- option defines the client\(aqs 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
- This functionality affects all TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
- This option works only with the following TLS backends:
- OpenSSL and wolfSSL
- .SH EXAMPLE
- .nf
- 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);
- }
- }
- .fi
- .SH AVAILABILITY
- Added in curl 7.73.0
- .SH RETURN VALUE
- Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
- .SH SEE ALSO
- .BR CURLOPT_SSL_CIPHER_LIST (3),
- .BR CURLOPT_SSL_OPTIONS (3),
- .BR CURLOPT_TLS13_CIPHERS (3)
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