host key fingerprint

[Jorge Almeida]

On Wed, 24 Aug 2005, Ronnie Gauthier wrote:

> It's the checksum of the key.
> http://sourceforge.net/docman/display_doc.php?docid=3088&group_id=1
>
I knew this one. It doesn't explain which checksum it is. md5? sha1?
something else taylored for openssh? The output is in hexadecimal
format...
I know I can use ssh-keygen to get a fingerprint (assuming that I
already have the key in a file), but what does ssh-keygen really do?
-- 
Jorge Almeida