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CURLOPT_SS...ALGORITHMS(3) Library Functions Manual CURLOPT_SS...ALGORITHMS(3) NAME CURLOPT_SSL_SIGNATURE_ALGORITHMS - signature algorithms to use for TLS SYNOPSIS #include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSL_SIGNATURE_ALGORITHMS, char *list); DESCRIPTION Pass a char pointer, pointing to a null-terminated string holding the list of signature algorithms to use for the TLS connection. The list must be syntactically correct, it consists of one or more signature algorithm strings separated by colons. A valid example of a signature algorithms list with OpenSSL is: "DSA+SHA256:rsa_pss_pss_sha256" 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. Works with OpenSSL and its BoringSSL fork (added in 8.14.0). 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: OpenSSL 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_SIGNATURE_ALGORITHMS, "DSA+SHA256:rsa_pss_pss_sha256"); result = curl_easy_perform(curl); curl_easy_cleanup(curl); } } HISTORY OpenSSL support added in 8.14.0. AVAILABILITY Added in curl 8.14.0 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_SSLVERSION(3), CURLOPT_SSL_CIPHER_LIST(3), CUR- LOPT_SSL_EC_CURVES(3), CURLOPT_USE_SSL(3) libcurl 2026-06-11 CURLOPT_SS...ALGORITHMS(3)
NAME | SYNOPSIS | DESCRIPTION | DEFAULT | PROTOCOLS | EXAMPLE | HISTORY | AVAILABILITY | RETURN VALUE | SEE ALSO
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