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CURLOPT_PR...S13_CIPHERS(3) Library Functions Manual CURLOPT_PR...S13_CIPHERS(3) NAME CURLOPT_PROXY_TLS13_CIPHERS - ciphers suites for proxy TLS 1.3 SYNOPSIS #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. For setting TLS 1.2 (1.1, 1.0) ciphers see CURLOPT_PROXY_SSL_CI- PHER_LIST(3). A valid example of a cipher list is: "TLS_AES_128_GCM_SHA256:TLS_CHACHA20_POLY1305_SHA256" 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. Using this option multiple times makes the last set string override the previous ones. Set it to NULL to disable its use again. DEFAULT NULL, use internal built-in list PROTOCOLS This functionality affects all TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc. This option works only with the following TLS backends: OpenSSL, Rustls, mbedTLS and wolfSSL EXAMPLE int main(void) { CURL *curl = curl_easy_init(); if(curl) { CURLcode result; curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/"); curl_easy_setopt(curl, CURLOPT_PROXY_TLS13_CIPHERS, "TLS_CHACHA20_POLY1305_SHA256"); result = curl_easy_perform(curl); curl_easy_cleanup(curl); } } HISTORY OpenSSL support added in 7.61.0, available when built with OpenSSL >= 1.1.1. LibreSSL support added in 8.3.0, available when built with LibreSSL >= 3.4.1. wolfSSL support added in 8.10.0. mbedTLS support added in 8.10.0, available when built with mbedTLS >= 3.6.0. Rustls support added in 8.10.0. Before curl 8.10.0 with mbedTLS or wolfSSL, TLS 1.3 cipher suites were set by using the CURLOPT_PROXY_SSL_CIPHER_LIST(3) option. AVAILABILITY Added in curl 7.61.0 RETURN VALUE curl_easy_setopt(3) returns a CURLcode indicating success or error. CURLE_OK (0) means everything was OK, non-zero means an error occurred, see libcurl-errors(3). SEE ALSO CURLOPT_PROXY_SSLVERSION(3), CURLOPT_PROXY_SSL_CIPHER_LIST(3), CURLOPT_SS- LVERSION(3), CURLOPT_SSL_CIPHER_LIST(3), CURLOPT_TLS13_CIPHERS(3) libcurl 2026-06-11 CURLOPT_PR...S13_CIPHERS(3)
NAME | SYNOPSIS | DESCRIPTION | DEFAULT | PROTOCOLS | EXAMPLE | HISTORY | AVAILABILITY | RETURN VALUE | SEE ALSO
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