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+---
+c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
+SPDX-License-Identifier: curl
+Title: CURLOPT_SSLCERT
+Section: 3
+Source: libcurl
+See-also:
+  - CURLOPT_KEYPASSWD (3)
+  - CURLOPT_SSLCERTTYPE (3)
+  - CURLOPT_SSLKEY (3)
+---
+
+# NAME
+
+CURLOPT_SSLCERT - SSL client certificate
+
+# SYNOPSIS
+
+~~~c
+#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,
+**"CurrentUserMY934a7ac6f8a5d579285a74fa"**. 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.
+
+# DEFAULT
+
+NULL
+
+# PROTOCOLS
+
+All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
+
+# EXAMPLE
+
+~~~c
+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
+
+If built TLS enabled.
+
+# RETURN VALUE
+
+Returns CURLE_OK if TLS enabled, CURLE_UNKNOWN_OPTION if not, or
+CURLE_OUT_OF_MEMORY if there was insufficient heap space.