NAME

       CURLOPT_TLS13_CIPHERS - specify ciphers suites to use for TLS 1.3

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TLS13_CIPHERS, char *list);

DESCRIPTION

       Pass  a  char *, pointing to a zero terminated string holding the list of cipher suites to
       use for the TLS 1.3 connection. The list must be syntactically correct, it consists of one
       or more cipher suite strings separated by colons.

       You'll find more details about cipher lists on this URL:

        https://curl.haxx.se/docs/ssl-ciphers.html

       This  option  is  currently used only when curl is built to use OpenSSL 1.1.1 or later. If
       you are using a different SSL backend you can try setting TLS 1.3 cipher suites  by  using
       the CURLOPT_SSL_CIPHER_LIST option.

       The application does not have to keep the string around after setting this option.

DEFAULT

       NULL, use internal default

PROTOCOLS

       All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.

EXAMPLE

       CURL *curl = curl_easy_init();
       if(curl) {
         curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
         curl_easy_setopt(curl, CURLOPT_TLS13_CIPHERS,
                          "TLS13-CHACHA20-POLY1305-SHA256");
         ret = curl_easy_perform(curl);
         curl_easy_cleanup(curl);
       }

AVAILABILITY

       Added in 7.61.0.  Available when built with OpenSSL >= 1.1.1.

RETURN VALUE

       Returns CURLE_OK if supported, CURLE_NOT_BUILT_IN otherwise.

SEE ALSO

       CURLOPT_SSL_CIPHER_LIST(3),    CURLOPT_SSLVERSION(3),    CURLOPT_PROXY_SSL_CIPHER_LIST(3),
       CURLOPT_PROXY_TLS13_CIPHERS(3), CURLOPT_PROXY_SSLVERSION(3), CURLOPT_USE_SSL(3),