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---
c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
SPDX-License-Identifier: curl
Title: CURLOPT_SSLENGINE
Section: 3
Source: libcurl
See-also:
- CURLINFO_SSL_ENGINES (3)
- CURLOPT_SSLENGINE_DEFAULT (3)
- CURLOPT_SSLKEY (3)
Protocol:
- TLS
TLS-backend:
- OpenSSL
Added-in: 7.9.3
---
# NAME
CURLOPT_SSLENGINE - Set SSL engine or provider
# SYNOPSIS
~~~c
#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%
# EXAMPLE
~~~c
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%
# 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.
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