CURLOPT_SSH_HOST_PUBLIC_KEY_MD5(3) Introduction to Library Functions

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 2025-02-25
CURLOPT_SSH_HOST_PUBLIC_KEY_MD5(3)