CURLOPT_PROXY_SSL_CIPHER_LIST - Man Page

ciphers to use for HTTPS proxy

Synopsis

#include <curl/curl.h>

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

Description

Pass a char *, pointing to a null-terminated string holding the list of ciphers to use for the connection to the HTTPS proxy. 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

Example

CURL *curl = curl_easy_init();
if(curl) {
  curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
  curl_easy_setopt(curl, CURLOPT_PROXY, "https://localhost");
  curl_easy_setopt(curl, CURLOPT_PROXY_SSL_CIPHER_LIST, "TLSv1");
  ret = curl_easy_perform(curl);
  curl_easy_cleanup(curl);
}

Availability

Added in 7.52.0, 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_PROXY_TLS13_CIPHERS(3), CURLOPT_PROXY_SSLVERSION(3), CURLOPT_SSL_CIPHER_LIST(3), CURLOPT_TLS13_CIPHERS(3), CURLOPT_SSLVERSION(3),

Referenced By

curl_easy_setopt(3), CURLOPT_PROXY_SSL_OPTIONS(3), CURLOPT_PROXY_TLS13_CIPHERS(3), CURLOPT_SSL_CIPHER_LIST(3), CURLOPT_TLS13_CIPHERS(3).

May 17, 2022 libcurl 7.85.0 curl_easy_setopt options