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---
c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
SPDX-License-Identifier: curl
Title: CURLOPT_PROXY_TLS13_CIPHERS
Section: 3
Source: libcurl
See-also:
- CURLOPT_PROXY_SSLVERSION (3)
- CURLOPT_PROXY_SSL_CIPHER_LIST (3)
- CURLOPT_SSLVERSION (3)
- CURLOPT_SSL_CIPHER_LIST (3)
- CURLOPT_TLS13_CIPHERS (3)
---
# NAME
CURLOPT_PROXY_TLS13_CIPHERS - ciphers suites for proxy TLS 1.3
# SYNOPSIS
~~~c
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_TLS13_CIPHERS,
char *list);
~~~
# DESCRIPTION
Pass a char pointer, pointing to a null-terminated string holding the list of
cipher suites to use for the TLS 1.3 connection to a proxy. The list must be
syntactically correct, it consists of one or more cipher suite strings
separated by colons.
Find more details about cipher lists on this URL:
https://curl.se/docs/ssl-ciphers.html
This option is currently used only when curl is built to use OpenSSL 1.1.1 or
later. If you are using a different SSL backend you can try setting TLS 1.3
cipher suites by using the CURLOPT_PROXY_SSL_CIPHER_LIST(3) option.
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
~~~c
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_PROXY_TLS13_CIPHERS,
"TLS_CHACHA20_POLY1305_SHA256");
res = curl_easy_perform(curl);
curl_easy_cleanup(curl);
}
}
~~~
# AVAILABILITY
Added in 7.61.0.
Available when built with OpenSSL >= 1.1.1.
# RETURN VALUE
Returns CURLE_OK if supported, CURLE_NOT_BUILT_IN otherwise.
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