---
name: "CURLOPT_PROXY_KEYPASSWD"
section: "3"
platform: "macos"
package: "curl"
version: "166.0.0.0.1"
release: "macOS 26.5"
platforms: ["linux", "macos"]
url: "https://new.carta.tech/CURLOPT_PROXY_KEYPASSWD"
---

# CURLOPT\_PROXY\_KEYPASSWD(3)

passphrase for the proxy private key

## NAME

CURLOPT\_PROXY\_KEYPASSWD - passphrase for the proxy private key

## SYNOPSIS

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

## DESCRIPTION

This option is for connecting to an HTTPS proxy, not an HTTPS server.

Pass a pointer to a null-terminated string as parameter. It is used as the password required to use the *[CURLOPT\_PROXY\_SSLKEY(3)](/CURLOPT_PROXY_SSLKEY/3.md)* 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.

## DEFAULT

NULL

## PROTOCOLS

Used with HTTPS proxy

## EXAMPLE

```
int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    CURLcode res;
    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/foo.bin");
    curl_easy_setopt(curl, CURLOPT_PROXY, "https://proxy:443");
    curl_easy_setopt(curl, CURLOPT_PROXY_KEYPASSWD, "superman");
    res = curl_easy_perform(curl);
    curl_easy_cleanup(curl);
  }
}
```

## AVAILABILITY

Added in 7.52.0

## RETURN VALUE

Returns CURLE\_OK if TLS enabled, CURLE\_UNKNOWN\_OPTION if not, or CURLE\_OUT\_OF\_MEMORY if there was insufficient heap space.

## SEE ALSO

[**CURLOPT\_KEYPASSWD**(3)](/CURLOPT_KEYPASSWD/3.md), [**CURLOPT\_PROXY\_SSLKEY**(3)](/CURLOPT_PROXY_SSLKEY/3.md), [**CURLOPT\_SSH\_PRIVATE\_KEYFILE**(3)](/CURLOPT_SSH_PRIVATE_KEYFILE/3.md), [**CURLOPT\_SSLKEY**(3)](/CURLOPT_SSLKEY/3.md)