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+---
+c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
+SPDX-License-Identifier: curl
+Title: CURLOPT_SSH_PUBLIC_KEYFILE
+Section: 3
+Source: libcurl
+See-also:
+  - CURLOPT_SSH_AUTH_TYPES (3)
+  - CURLOPT_SSH_PRIVATE_KEYFILE (3)
+---
+
+# NAME
+
+CURLOPT_SSH_PUBLIC_KEYFILE - public key file for SSH auth
+
+# SYNOPSIS
+
+~~~c
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSH_PUBLIC_KEYFILE,
+                          char *filename);
+~~~
+
+# DESCRIPTION
+
+Pass a char pointer pointing to a *filename* for your public key. If not used,
+libcurl defaults to **$HOME/.ssh/id_dsa.pub** if the HOME environment variable
+is set, and just "id_dsa.pub" in the current directory if HOME is not set.
+
+If NULL (or an empty string) is passed to this option, libcurl passes no
+public key to the SSH library, which then rather derives it from the private
+key. If the SSH library cannot derive the public key from the private one and
+no public one is provided, the transfer fails.
+
+The application does not have to keep the string around after setting this
+option.
+
+# DEFAULT
+
+NULL
+
+# PROTOCOLS
+
+SFTP and SCP
+
+# EXAMPLE
+
+~~~c
+int main(void)
+{
+  CURL *curl = curl_easy_init();
+  if(curl) {
+    CURLcode res;
+    curl_easy_setopt(curl, CURLOPT_URL, "sftp://example.com/file");
+    curl_easy_setopt(curl, CURLOPT_SSH_PUBLIC_KEYFILE,
+                     "/home/clarkkent/.ssh/id_rsa.pub");
+    res = curl_easy_perform(curl);
+    curl_easy_cleanup(curl);
+  }
+}
+~~~
+
+# AVAILABILITY
+
+The "" trick was added in 7.26.0
+
+# RETURN VALUE
+
+Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or
+CURLE_OUT_OF_MEMORY if there was insufficient heap space.