CURLINFO_SSL_ENGINES - get an slist of OpenSSL crypto-engines

#include <curl/curl.h>
CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_SSL_ENGINES,
                           struct curl_slist **engine_list);

Pass the address of a 'struct curl_slist *' to receive a linked-list of OpenSSL crypto-engines supported. Note that engines are normally implemented in separate dynamic libraries. Hence not all the returned engines may be available at runtime. NOTE: you must call curl_slist_free_all(3) on the list pointer once you are done with it, as libcurl does not free this data for you.

All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.

This option works only with the following TLS backends: OpenSSL

int main(void)
  CURL *curl = curl_easy_init();
  if(curl) {
    CURLcode res;
    struct curl_slist *engines;
    res = curl_easy_getinfo(curl, CURLINFO_SSL_ENGINES, &engines);
    if((res == CURLE_OK) && engines) {
      /* we have a list, free it when done using it */

Added in 7.12.3. Available in OpenSSL builds with "engine" support.

Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.

CURLOPT_SSLENGINE(3), curl_easy_getinfo(3), curl_easy_setopt(3)

2024-05-22 libcurl