CURLOPT_SSLCERT - set SSL client certificate
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSLCERT, char *cert);
Pass a pointer to a zero terminated string as parameter. The string should be
the file name of your client certificate. The default format is
"P12" on Secure Transport and "PEM" on other engines, and
can be changed with CURLOPT_SSLCERTTYPE(3)
With NSS or Secure Transport, this can also be the nickname of the certificate
you wish to authenticate with as it is named in the security database. If you
want to use a file from the current directory, please precede it with
"./" prefix, in order to avoid confusion with a nickname.
(Schannel/WinSSL only) Client certificates must be specified by a path
expression to a certificate store. (Loading PFX is not supported; you can
import it to a store first). You can use "<store
location>\<store name>\<thumbprint>" to refer to a
certificate in the system certificates store, for example,
Thumbprint is usually a SHA-1 hex string which you can see in certificate
details. Following store locations are supported: CurrentUser, LocalMachine,
CurrentService, Services, CurrentUserGroupPolicy, LocalMachineGroupPolicy,
When using a client certificate, you most likely also need to provide a private
key with CURLOPT_SSLKEY(3)
The application does not have to keep the string around after setting this
All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
CURL *curl = curl_easy_init();
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
curl_easy_setopt(curl, CURLOPT_SSLCERT, "client.pem");
curl_easy_setopt(curl, CURLOPT_SSLKEY, "key.pem");
curl_easy_setopt(curl, CURLOPT_KEYPASSWD, "s3cret");
ret = curl_easy_perform(curl);
If built TLS enabled.
Returns CURLE_OK if TLS enabled, CURLE_UNKNOWN_OPTION if not, or
CURLE_OUT_OF_MEMORY if there was insufficient heap space.