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)