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CURLOPT_SSLKEY(3) curl_easy_setopt options CURLOPT_SSLKEY(3)
CURLOPT_SSLKEY - private key file for TLS and SSL client cert
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSLKEY, char *keyfile);
Pass a pointer to a null-terminated string as parameter. The string
should be the file name of your private key. The default format is
"PEM" and can be changed with CURLOPT_SSLKEYTYPE(3).
(Windows, iOS and Mac OS X) This option is ignored by Secure Transport
and Schannel SSL backends because they expect the private key to be
already present in the key-chain or PKCS#12 file containing the
The application does not have to keep the string around after setting
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 is supported, CURLE_UNKNOWN_OPTION if not, or
CURLE_OUT_OF_MEMORY if there was insufficient heap space.
libcurl 7.87.0 September 20, 2022 CURLOPT_SSLKEY(3)