.\" generated by cd2nroff 0.1 from CURLOPT_PROXY_SSLKEY.md .TH CURLOPT_PROXY_SSLKEY 3 "2024-04-19" libcurl .SH NAME CURLOPT_PROXY_SSLKEY \- private key file for HTTPS proxy client cert .SH SYNOPSIS .nf #include CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_SSLKEY, char *keyfile); .fi .SH 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 \fICURLOPT_PROXY_SSLKEYTYPE(3)\fP. (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. .SH DEFAULT NULL .SH PROTOCOLS All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc. This option works only with the following TLS backends: OpenSSL, Schannel, mbedTLS and wolfSSL .SH EXAMPLE .nf 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); } } .fi .SH AVAILABILITY Added in 7.52.0 If built TLS enabled. .SH 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. .SH SEE ALSO .BR CURLOPT_PROXY_SSLCERT (3), .BR CURLOPT_PROXY_SSLKEYTYPE (3), .BR CURLOPT_SSLCERT (3), .BR CURLOPT_SSLKEY (3), .BR CURLOPT_SSLKEYTYPE (3)