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CURLOPT_SSLENGINE(3)	   Library Functions Manual	  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 pri-
       vate 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 option-
       ally 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 res;
	   curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
	   curl_easy_setopt(curl, CURLOPT_SSLENGINE, "dynamic");
	   res = 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	 back-
       end.

       CURLE_UNKNOWN_OPTION - Option not recognized.

       CURLE_OUT_OF_MEMORY - Insufficient heap space.

SEE ALSO
       CURLINFO_SSL_ENGINES(3),	   CURLOPT_SSLENGINE_DEFAULT(3),   CURLOPT_SS-
       LKEY(3)

libcurl				  2025-06-03		  CURLOPT_SSLENGINE(3)

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