Tribblix: manual page: CURLOPT

CURLOPT_SSLENGINE(3) Introduction to Library Functions CURLOPT_SSLENGINE(3)

NAME

CURLOPT_SSLENGINE - Set SSL engine or provider

SYNOPSIS

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSLENGINE, char *id);

DESCRIPTION

Pass a pointer to a null-terminated string as parameter. It is used
as the identifier for the engine or provider you want to use for your
private key. OpenSSL 1 had engines, OpenSSL 3 has providers.

The application does not have to keep the string around after setting
this option.

When asking libcurl to use a provider, the application can also
optionally provide a property, a set of name value pairs. Such a
property can be specified separated from the name with a colon (:).

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

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");
result = curl_easy_perform(curl);
curl_easy_cleanup(curl);
}
}

AVAILABILITY

Added in curl 7.9.3

RETURN VALUE

CURLE_OK - Engine found.

CURLE_SSL_ENGINE_NOTFOUND - Engine not found, or OpenSSL was not
built with engine support.

CURLE_SSL_ENGINE_INITFAILED - Engine found but initialization failed.

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.