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CURLOPT_SSLENGINE_DEFAULT - make SSL engine default

NAME  SYNOPSIS  DESCRIPTION  DEFAULT  PROTOCOLS  EXAMPLE  AVAILABILITY  RETURN VALUE  SEE ALSO 

NAME

CURLOPT_SSLENGINE_DEFAULT − make SSL engine default

SYNOPSIS

#include <curl/curl.h>

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

DESCRIPTION

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).

DEFAULT

None

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_SSLENGINE, "dynamic");
curl_easy_setopt(curl, CURLOPT_SSLENGINE_DEFAULT, 1L);
result = curl_easy_perform(curl);
curl_easy_cleanup(curl);
}
}

AVAILABILITY

Added in curl 7.9.3

RETURN VALUE

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.

SEE ALSO

CURLOPT_SSLCERT(3), CURLOPT_SSLENGINE(3)


Updated 2026-06-01 - jenkler.se | uex.se