CURLOPT_SSLENGINE_DEFAULT - Man Page

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSLENGINE_DEFAULT, long val);

Pass a long set to 1 to make the already specified crypto engine the default for (asymmetric) crypto operations.

This option has no effect unless set after CURLOPT_SSLENGINE(3).

None

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

CURL *curl = curl_easy_init();
if(curl) {
  curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
  curl_easy_setopt(curl, CURLOPT_SSLENGINE, "dynamic");
  curl_easy_setopt(curl, CURLOPT_SSLENGINE_DEFAULT, 1L);
  ret = curl_easy_perform(curl);
  curl_easy_cleanup(curl);
}

Only if the SSL backend is OpenSSL built with engine support.

CURLE_OK - Engine set as default.

CURLE_SSL_ENGINE_SETFAILED - Engine could not be set as default.

CURLE_NOT_BUILT_IN - Option not built in, OpenSSL is not the SSL backend.

CURLE_UNKNOWN_OPTION - Option not recognized.

CURLE_OUT_OF_MEMORY - Insufficient heap space.

CURLOPT_SSLENGINE(3), CURLOPT_SSLCERT(3)

curl_easy_setopt(3), CURLOPT_SSLENGINE(3).