NAME

       CURLOPT_PROXY_SSLKEY - private key file for HTTPS proxy client cert

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_SSLKEY, char *keyfile);

DESCRIPTION

       Pass  a  pointer  to  a  null-terminated  string  as parameter. The string should be the filename of your
       private key used for connecting to the HTTPS proxy. The default format is "PEM" and can be  changed  with
       CURLOPT_PROXY_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
       certificate.

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

DEFAULT

       NULL

PROTOCOLS

       This functionality affects all TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.

       This option works only with the following TLS backends: OpenSSL, Schannel, mbedTLS and wolfSSL

EXAMPLE

       int main(void)
       {
         CURL *curl = curl_easy_init();
         if(curl) {
           CURLcode res;
           curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
           curl_easy_setopt(curl, CURLOPT_PROXY, "https://proxy");
           curl_easy_setopt(curl, CURLOPT_PROXY_SSLCERT, "client.pem");
           curl_easy_setopt(curl, CURLOPT_PROXY_SSLKEY, "key.pem");
           curl_easy_setopt(curl, CURLOPT_PROXY_KEYPASSWD, "s3cret");
           res = curl_easy_perform(curl);
           curl_easy_cleanup(curl);
         }
       }

AVAILABILITY

       Added in curl 7.52.0

RETURN VALUE

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

SEE ALSO

       CURLOPT_PROXY_SSLCERT(3),     CURLOPT_PROXY_SSLKEYTYPE(3),     CURLOPT_SSLCERT(3),     CURLOPT_SSLKEY(3),
       CURLOPT_SSLKEYTYPE(3)