NAME

       CURLOPT_SSL_CIPHER_LIST - specify 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 zero 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.

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

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

       For NSS, valid examples of cipher lists include 'rsa_rc4_128_md5', ´rsa_aes_128_sha´, etc.
       With NSS you don't add/remove ciphers. If one uses this option then all known ciphers  are
       disabled and only those passed in are enabled.

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

       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_SSL_CIPHER_LIST, "TLSv1");
         ret = curl_easy_perform(curl);
         curl_easy_cleanup(curl);
       }

AVAILABILITY

       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),