.\" generated by cd2nroff 0.1 from CURLOPT_PROXY_TLS13_CIPHERS.md
.TH CURLOPT_PROXY_TLS13_CIPHERS 3 "2024-11-18" libcurl
.SH NAME
CURLOPT_PROXY_TLS13_CIPHERS \- ciphers suites for proxy TLS 1.3
.SH SYNOPSIS
.nf
#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_TLS13_CIPHERS,
                          char *list);
.fi
.SH 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 \fICURLOPT_PROXY_SSL_CIPHER_LIST(3)\fP option.

The application does not have to keep the string around after setting this
option.
.SH DEFAULT
NULL, use internal built\-in list
.SH PROTOCOLS
This functionality affects all TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.

This option works only with the following TLS backends:
OpenSSL and Schannel
.SH EXAMPLE
.nf
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);
  }
}
.fi
.SH AVAILABILITY
Added in curl 7.61.0
.SH RETURN VALUE
Returns CURLE_OK if supported, CURLE_NOT_BUILT_IN otherwise.
.SH SEE ALSO
.BR CURLOPT_PROXY_SSLVERSION (3),
.BR CURLOPT_PROXY_SSL_CIPHER_LIST (3),
.BR CURLOPT_SSLVERSION (3),
.BR CURLOPT_SSL_CIPHER_LIST (3),
.BR CURLOPT_TLS13_CIPHERS (3)