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CURLOPT_TLS13_CIPHERS(3)            libcurl           CURLOPT_TLS13_CIPHERS(3)

NAME
       CURLOPT_TLS13_CIPHERS - 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 null-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 will find more details about cipher lists on this URL:

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

       This option is currently used only when curl is built to use OpenSSL
       1.1.1 or later or Schannel. If you are using a different SSL backend
       you can try setting TLS 1.3 cipher suites by using the
       CURLOPT_SSL_CIPHER_LIST(3) 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,
                          "TLS_CHACHA20_POLY1305_SHA256");
         ret = curl_easy_perform(curl);
         curl_easy_cleanup(curl);
       }

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

       Added in 7.85.0 for Schannel.

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),

ibcurl 8.1.2                    April 26, 2023        CURLOPT_TLS13_CIPHERS(3)