DOKK / manpages / debian 12 / libcurl4-doc / CURLOPT_KEYPASSWD.3.en
CURLOPT_KEYPASSWD(3) curl_easy_setopt options CURLOPT_KEYPASSWD(3)

CURLOPT_KEYPASSWD - passphrase to private key

#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_KEYPASSWD, char *pwd);

Pass a pointer to a null-terminated string as parameter. It will be used as the password required to use the CURLOPT_SSLKEY(3) or CURLOPT_SSH_PRIVATE_KEYFILE(3) private key. You never need a pass phrase to load a certificate but you need one to load your private key.

The application does not have to keep the string around after setting this option.

NULL

All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.

CURL *curl = curl_easy_init();
if(curl) {

curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/foo.bin");
curl_easy_setopt(curl, CURLOPT_SSLCERT, "client.pem");
curl_easy_setopt(curl, CURLOPT_SSLKEY, "key.pem");
curl_easy_setopt(curl, CURLOPT_KEYPASSWD, "superman");
ret = curl_easy_perform(curl);
curl_easy_cleanup(curl); }

This option was known as CURLOPT_SSLKEYPASSWD up to 7.16.4 and CURLOPT_SSLCERTPASSWD up to 7.9.2.

Returns CURLE_OK if TLS enabled, CURLE_UNKNOWN_OPTION if not, or CURLE_OUT_OF_MEMORY if there was insufficient heap space.

CURLOPT_SSLKEY(3), CURLOPT_SSH_PRIVATE_KEYFILE(3),

January 2, 2023 libcurl 7.88.1