## 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 "PEM" or "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, CURLOPT_SSL_VERIFYHOST, CURLOPT_CAINFO, CURLOPT_CAPATH,

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