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.\" generated by cd2nroff 0.1 from CURLOPT_SSLENGINE.md
.TH CURLOPT_SSLENGINE 3 "2025-06-27" libcurl
.SH NAME
CURLOPT_SSLENGINE \- Set SSL engine or provider
.SH SYNOPSIS
.nf
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSLENGINE, char *id);
.fi
.SH DESCRIPTION
Pass a pointer to a null\-terminated string as parameter. It is used as the
identifier for the \fIengine\fP or \fIprovider\fP 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 \fIproperty\fP, a set of name value pairs. Such a property can be
specified separated from the name with a colon (\fI:\fP).
Using this option multiple times makes the last set string override the
previous ones. Set it to NULL to disable its use again.
.SH DEFAULT
NULL
.SH PROTOCOLS
This functionality affects all TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
This option works only with the following TLS backends:
OpenSSL
.SH EXAMPLE
.nf
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);
}
}
.fi
.SH AVAILABILITY
Added in curl 7.9.3
.SH 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.
.SH SEE ALSO
.BR CURLINFO_SSL_ENGINES (3),
.BR CURLOPT_SSLENGINE_DEFAULT (3),
.BR CURLOPT_SSLKEY (3)