.\" generated by cd2nroff 0.1 from CURLOPT_SSLCERT.md
.TH CURLOPT_SSLCERT 3 "2026-06-24" libcurl
.SH NAME
CURLOPT_SSLCERT \- SSL client certificate
.SH SYNOPSIS
.nf
#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSLCERT, char *cert);
.fi
.SH 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 \fIPEM\fP but can
be changed with \fICURLOPT_SSLCERTTYPE(3)\fP.

(Schannel) Client certificates can be specified by a path expression to a
certificate store. (You can import \fIPFX\fP to a store first). You can use
\&"<store location>\\<store name>\\<thumbprint>" to refer to a certificate
in the system certificates store, for example,
\fB"CurrentUser\\MY\\934a7ac6f8a5d5"\fP. The thumbprint is usually a SHA\-1 hex
string which you can see in certificate details. Following store locations are
supported: \fBCurrentUser\fP, \fBLocalMachine\fP, \fBCurrentService\fP,
\fBServices\fP, \fBCurrentUserGroupPolicy\fP, \fBLocalMachineGroupPolicy\fP,
\fBLocalMachineEnterprise\fP. Schannel also support P12 certificate file, with
the string \fIP12\fP specified with \fICURLOPT_SSLCERTTYPE(3)\fP.

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

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.
.SH DEFAULT
NULL
.SH PROTOCOLS
This functionality affects  all TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc. only

All TLS backends support this option.
.SH EXAMPLE
.nf
int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    CURLcode result;
    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");
    result = curl_easy_perform(curl);
    curl_easy_cleanup(curl);
  }
}
.fi
.SH AVAILABILITY
Added in curl 7.1
.SH RETURN VALUE
\fIcurl_easy_setopt(3)\fP returns a CURLcode indicating success or error.

CURLE_OK (0) means everything was OK, non\-zero means an error occurred, see
\fIlibcurl\-errors(3)\fP.
.SH SEE ALSO
.BR CURLOPT_KEYPASSWD (3),
.BR CURLOPT_SSLCERTTYPE (3),
.BR CURLOPT_SSLKEY (3)