NAME

       CURLOPT_SSL_CIPHER_LIST - ciphers to use for TLS

SYNOPSIS

       #include <curl/curl.h>

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

DESCRIPTION

       Pass a char *, pointing to a null-terminated string holding the list of ciphers to use for
       the SSL connection. The list must be syntactically correct, it consists  of  one  or  more
       cipher  strings  separated  by colons. Commas or spaces are also acceptable separators but
       colons are normally used, !, - and + can be used as operators.

       For OpenSSL and GnuTLS valid examples of cipher lists include RC4-SHA, SHA1+DES, TLSv1 and
       DEFAULT. The default list is normally set when you compile OpenSSL.

       For    WolfSSL,    valid    examples    of   cipher   lists   include   ECDHE-RSA-RC4-SHA,
       AES256-SHA:AES256-SHA256, etc.

       For BearSSL, valid examples of cipher lists include ECDHE-RSA-CHACHA20-POLY1305:ECDHE-RSA-
       AES128-GCM-SHA256,           or           when          using          IANA          names
       TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256:TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,    etc.
       With BearSSL you do not add/remove ciphers. If one uses this option then all known ciphers
       are disabled and only those passed in are enabled.

       For Schannel, you can use this option to set algorithms but not  specific  cipher  suites.
       Refer to the ciphers lists document for algorithms.

       Find more details about cipher lists on this URL:

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

       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

       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_CIPHER_LIST, "TLSv1");
           res = curl_easy_perform(curl);
           curl_easy_cleanup(curl);
         }
       }

AVAILABILITY

       Added in 7.9, in 7.83.0 for BearSSL

       If built TLS enabled.

RETURN VALUE

       Returns  CURLE_OK if TLS is supported, CURLE_UNKNOWN_OPTION if not, or CURLE_OUT_OF_MEMORY
       if there was insufficient heap space.

SEE ALSO

       CURLOPT_TLS13_CIPHERS(3),     CURLOPT_SSLVERSION(3),     CURLOPT_PROXY_SSL_CIPHER_LIST(3),
       CURLOPT_PROXY_TLS13_CIPHERS(3), CURLOPT_USE_SSL(3)