CURLOPT_SSL_CIPHER_LIST - ciphers to use for TLS
#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSL_CIPHER_LIST, char *list);
curl_easy_setopt options CURLOPT_SSL_CIPHER_LIST(3)
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.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
+---------------+------------------+
|ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+---------------+------------------+
|Availability | web/curl |
+---------------+------------------+
|Stability | Uncommitted |
+---------------+------------------+
SEE ALSO
CURLOPT_TLS13_CIPHERS(3), CURLOPT_SSLVERSION(3), CUR-
LOPT_PROXY_SSL_CIPHER_LIST(3), CURLOPT_PROXY_TLS13_CIPHERS(3), CUR-
LOPT_USE_SSL(3),
NOTES
Source code for open source software components in Oracle Solaris can
be found at https://www.oracle.com/downloads/opensource/solaris-source-
code-downloads.html.
This software was built from source available at
https://github.com/oracle/solaris-userland. The original community
source was downloaded from https://curl.se/down-
load/curl-7.83.1.tar.bz2.
Further information about this software can be found on the open source
community website at http://curl.haxx.se/.
libcurl 7.83.1 December 06, 2021
CURLOPT_SSL_CIPHER_LIST(3)