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CURLOPT_SSL_CIPHER_LIST(3)                            curl_easy_setopt options


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 NSS, valid examples of cipher lists include rsa_rc4_128_md5,
       rsa_aes_128_sha, etc. With NSS 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 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.

       you will 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

       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

       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),

libcurl 7.87.0                   May 17, 2022       CURLOPT_SSL_CIPHER_LIST(3)

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