[Bug 723167] curlsftpsink: allow remote host authentication by public key fingerprint

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=723167
  GStreamer | gst-plugins-bad | git

--- Comment #3 from Sorin L. <sorin.l at mail.com> 2014-02-04 13:53:04 UTC ---
> Looks good but why (only) MD5?

libcurl has no support for other types of hashes (at least in the context of
SSH keys):
http://curl.haxx.se/libcurl/c/curl_easy_setopt.html (see section: "SSH
OPTIONS")

Besides, MD5 is the typical hash used by the OpenSSH ssh & sftp clients, for
example:

# ssh johndoe at dh6 <ENTER>
The authenticity of host 'dh6(192.168.0.196)' can't be established.
RSA key fingerprint is d2:75:e8:fd:4b:fb:a7:2c:a0:81:1a:cd:dd:03:db:c7.
Are you sure you want to continue connecting (yes/no)?

In fact, after a quick check of "man ssh", I think MD5 is the only type of hash
that these clients (ssh, sftp) can present to the user.

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