.\" ************************************************************************** .\" * _ _ ____ _ .\" * Project ___| | | | _ \| | .\" * / __| | | | |_) | | .\" * | (__| |_| | _ <| |___ .\" * \___|\___/|_| \_\_____| .\" * .\" * Copyright (C) Daniel Stenberg, , et al. .\" * .\" * This software is licensed as described in the file COPYING, which .\" * you should have received as part of this distribution. The terms .\" * are also available at https://curl.se/docs/copyright.html. .\" * .\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell .\" * copies of the Software, and permit persons to whom the Software is .\" * furnished to do so, under the terms of the COPYING file. .\" * .\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY .\" * KIND, either express or implied. .\" * .\" * SPDX-License-Identifier: curl .\" * .\" ************************************************************************** .\" .TH CURLOPT_PROXY_SSL_CIPHER_LIST 3 "December 04, 2023" "ibcurl 8.5.0" libcurl .SH NAME CURLOPT_PROXY_SSL_CIPHER_LIST \- ciphers to use for HTTPS proxy .SH SYNOPSIS .nf #include CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_SSL_CIPHER_LIST, char *list); .fi .SH 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 \fBRC4-SHA\fP, \fBSHA1+DES\fP, \fBTLSv1\fP and \fBDEFAULT\fP. The default list is normally set when you compile OpenSSL. For WolfSSL, valid examples of cipher lists include \fBECDHE-RSA-RC4-SHA\fP, \fBAES256-SHA:AES256-SHA256\fP, etc. For BearSSL, valid examples of cipher lists include \fBECDHE-RSA-CHACHA20-POLY1305:ECDHE-RSA-AES128-GCM-SHA256\fP, or when using IANA names \fBTLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256:TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256\fP, 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. 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. .SH DEFAULT NULL, use internal default .SH PROTOCOLS All .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, "https://localhost"); curl_easy_setopt(curl, CURLOPT_PROXY_SSL_CIPHER_LIST, "TLSv1"); res = curl_easy_perform(curl); curl_easy_cleanup(curl); } } .fi .SH AVAILABILITY Added in 7.52.0, in 7.83.0 for BearSSL If built TLS enabled. .SH 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. .SH "SEE ALSO" .BR CURLOPT_PROXY_SSLVERSION (3), .BR CURLOPT_PROXY_TLS13_CIPHERS (3), .BR CURLOPT_SSL_CIPHER_LIST (3), .BR CURLOPT_SSLVERSION (3), .BR CURLOPT_TLS13_CIPHERS (3)