---
c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
SPDX-License-Identifier: curl
Title: CURLOPT_KEYPASSWD
Section: 3
Source: libcurl
See-also:
  - CURLOPT_SSH_PRIVATE_KEYFILE (3)
  - CURLOPT_SSLKEY (3)
Protocol:
  - TLS
TLS-backend:
  - OpenSSL
  - mbedTLS
  - Schannel
  - wolfSSL
Added-in: 7.17.0
---

# NAME

CURLOPT_KEYPASSWD - passphrase to private key

# SYNOPSIS

~~~c
#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_KEYPASSWD, char *pwd);
~~~

# DESCRIPTION

Pass a pointer to a null-terminated string as parameter. It is used as the
password required to use the CURLOPT_SSLKEY(3) or
CURLOPT_SSH_PRIVATE_KEYFILE(3) private key. You never need a passphrase 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.

Using this option multiple times makes the last set string override the
previous ones. Set it to NULL to disable its use again.

# DEFAULT

NULL

# %PROTOCOLS%

# EXAMPLE

~~~c
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_SSLCERT, "client.pem");
    curl_easy_setopt(curl, CURLOPT_SSLKEY, "key.pem");
    curl_easy_setopt(curl, CURLOPT_KEYPASSWD, "superman");
    res = curl_easy_perform(curl);
    curl_easy_cleanup(curl);
  }
}
~~~

# HISTORY

This option was known as CURLOPT_SSLKEYPASSWD up to 7.16.4 and
CURLOPT_SSLCERTPASSWD up to 7.9.2.

# %AVAILABILITY%

# RETURN VALUE

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