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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 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 spec-
     ified 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.

SEE ALSO
     CURLINFO_SSL_ENGINES(3), CURLOPT_SSLENGINE_DEFAULT(3), CURLOPT_SSLKEY(3)

libcurl 			   2026-06-11		    CURLOPT_SSLENGINE(3)

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