NAME

       CURLOPT_SSH_HOST_PUBLIC_KEY_MD5 - MD5 checksum of SSH server public key

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSH_HOST_PUBLIC_KEY_MD5,
                                 char *md5);

DESCRIPTION

       Pass  a  char pointer pointing to a string containing 32 hexadecimal digits. The string should be the 128
       bit MD5 checksum of the remote host's public key, and libcurl aborts the connection to  the  host  unless
       the MD5 checksum match.

       MD5 is a weak algorithm. We strongly recommend using CURLOPT_SSH_HOST_PUBLIC_KEY_SHA256(3) instead.

       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 scp and sftp

EXAMPLE

       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_HOST_PUBLIC_KEY_MD5,
                            "afe17cd62a0f3b61f1ab9cb22ba269a7");
           res = curl_easy_perform(curl);
           curl_easy_cleanup(curl);
         }
       }

AVAILABILITY

       Added in curl 7.17.1

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_SSH_AUTH_TYPES(3),       CURLOPT_SSH_HOST_PUBLIC_KEY_SHA256(3),        CURLOPT_SSH_KNOWNHOSTS(3),
       CURLOPT_SSH_PUBLIC_KEYFILE(3)

libcurl                                            2025-06-16                 CURLOPT_SSH_HOST_PUBLIC_KEY_MD5(3)