CURLOPT_KEYPASSWD (3) - Linux Man Pages
CURLOPT_KEYPASSWD: set passphrase to private key
NAMECURLOPT_KEYPASSWD - set passphrase to private key
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_KEYPASSWD, char *pwd);
DESCRIPTIONPass a pointer to a zero 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 needed a pass phrase to load a certificate but you need one to load your private key.
PROTOCOLSAll TLS based protocols: HTTPS, FTPS, IMAPS, POP3, SMTPS etc.
AVAILABILITYThis option was known as CURLOPT_SSLKEYPASSWD up to 7.16.4 and CURLOPT_SSLCERTPASSWD up to 7.9.2.
RETURN VALUEReturns CURLE_OK if TLS enabled, CURLE_UNKNOWN_OPTION if not, or CURLE_OUT_OF_MEMORY if there was insufficient heap space.
SEE ALSOCURLOPT_SSLKEY(3), CURLOPT_SSH_PRIVATE_KEYFILE(3),