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CURLOPT_SSL_CIPHER_LIST(3) Library Functions Manual CURLOPT_SSL_CIPHER_LIST(3) NAME CURLOPT_SSL_CIPHER_LIST - ciphers to use for TLS SYNOPSIS #include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSL_CIPHER_LIST, char *list); DESCRIPTION Pass a char pointer, pointing to a null-terminated string holding the list of cipher suites to use for the TLS 1.2 (1.1, 1.0) connection. The list must be syntactically correct, it consists of one or more cipher suite strings separated by colons. For setting TLS 1.3 ciphers see CURLOPT_TLS13_CIPHERS(3). A valid example of a cipher list with OpenSSL is: "ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:" "ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305" For Schannel, you can use this option to set algorithms but not specific cipher suites. Refer to the ciphers lists document for algorithms. GnuTLS has the concept of a [priority string](https://gnutls.org/man- ual/html_node/Priority-Strings.html) which has its own syntax and keywords. The string set via CURLOPT_SSL_CIPHER_LIST(3) directly influences the pri- ority setting. 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 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: GnuTLS, OpenSSL, Rustls, Schannel, 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_SSL_CIPHER_LIST, "ECDHE-ECDSA-CHACHA20-POLY1305:" "ECDHE-RSA-CHACHA20-POLY1305"); result = curl_easy_perform(curl); curl_easy_cleanup(curl); } } HISTORY OpenSSL support added in 7.9. wolfSSL support added in 7.53.0. Schannel support added in 7.61.0. mbedTLS support added in 8.8.0. Rustls support added in 8.10.0. Since curl 8.10.0 returns CURLE_NOT_BUILT_IN when not supported. AVAILABILITY Added in curl 7.9 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_SSL_CIPHER_LIST(3), CURLOPT_PROXY_TLS13_CIPHERS(3), CUR- LOPT_SSLVERSION(3), CURLOPT_TLS13_CIPHERS(3), CURLOPT_USE_SSL(3) libcurl 2026-06-11 CURLOPT_SSL_CIPHER_LIST(3)
NAME | SYNOPSIS | DESCRIPTION | DEFAULT | PROTOCOLS | EXAMPLE | HISTORY | AVAILABILITY | RETURN VALUE | SEE ALSO
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