CURLOPT_PINNEDPUBLICKEY(3)

NAME
CURLOPT_PINNEDPUBLICKEY - set pinned public key

SYNOPSIS
#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PINNEDPUBLICKEY, char *pinnedpubkey);

DESCRIPTION
Pass a pointer to a zero terminated string as parameter. The string should be the file name of your pinned public key. The format expected is "DER". When negotiating a TLS or SSL connection, the server sends a certificate indicating its identity. A public key is extracted from this certificate and if it does not exactly match the public key provided to this option, curl will abort the connection before sending or receiving any data.

DEFAULT
NULL

PROTOCOLS
All TLS based protocols: HTTPS, FTPS, IMAPS, POP3, SMTPS etc.

EXAMPLE
CURL *curl = curl_easy_init();
if(curl) {
  curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
  curl_easy_setopt(curl, CURLOPT_PINNEDPUBLICKEY, "/etc/publickey.der");
  /* Perform the request */
  curl_easy_perform(curl);
}

AVAILABILITY
If built TLS enabled. This is currently only implemented in the OpenSSL, GnuTLS and GSKit backends. Added in libcurl 7.39.0

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_SSL_VERIFYPEER(3), CURLOPT_SSL_VERIFYHOST(3), CURLOPT_CAINFO(3), CURLOPT_CAPATH(3),