NAME

       CURLOPT_SSLCERT - SSL client certificate

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSLCERT, char *cert);

DESCRIPTION

       Pass a pointer to a null-terminated string as parameter. The string should be the filename of your client
       certificate.  The  default format is P12 on Secure Transport and PEM on other engines, and can be changed
       with CURLOPT_SSLCERTTYPE(3).

       With Secure Transport, this can also be the nickname of the certificate you wish to authenticate with  as
       it  is  named  in  the  security  database.  If you want to use a file from the current directory, please
       precede it with ./ prefix, in order to avoid confusion with a nickname.

       (Schannel only) Client certificates can be specified by a path expression to a  certificate  store.  (You
       can  import PFX to a store first). You can use "<store location>\<store name>\<thumbprint>" to refer to a
       certificate  in  the  system  certificates  store,  for  example,  "CurrentUser\MY\934a7ac6f8a5d5".   The
       thumbprint  is  usually  a  SHA-1  hex  string  which you can see in certificate details. Following store
       locations are supported: CurrentUser,  LocalMachine,  CurrentService,  Services,  CurrentUserGroupPolicy,
       LocalMachineGroupPolicy,  LocalMachineEnterprise.  Schannel  also  support P12 certificate file, with the
       string P12 specified with CURLOPT_SSLCERTTYPE(3).

       When  using  a  client  certificate,  you  most  likely  also  need  to  provide  a  private   key   with
       CURLOPT_SSLKEY(3).

       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

       This functionality affects all TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.

       This option works only with the following TLS backends:  GnuTLS,  OpenSSL,  Schannel,  Secure  Transport,
       mbedTLS and wolfSSL

EXAMPLE

       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_SSLCERT, "client.pem");
           curl_easy_setopt(curl, CURLOPT_SSLKEY, "key.pem");
           curl_easy_setopt(curl, CURLOPT_KEYPASSWD, "s3cret");
           res = curl_easy_perform(curl);
           curl_easy_cleanup(curl);
         }
       }

AVAILABILITY

       Added in curl 7.1

RETURN VALUE

       curl_easy_setopt(3) returns a CURLcode indicating success or error.

       CURLE_OK (0) means everything was OK, non-zero means an error occurred, see libcurl-errors(3).

SEE ALSO

       CURLOPT_KEYPASSWD(3), CURLOPT_SSLCERTTYPE(3), CURLOPT_SSLKEY(3)

libcurl                                            2025-03-05                                 CURLOPT_SSLCERT(3)