etc-shadow

[jd1008]

On 02/21/2015 06:07 PM, Chris Murphy wrote:
> I'm curious about how the hash in /etc/passwd is generated.
>
> I know it's SHA512 based, since the 2nd field starts with $6$. But the
> characters that follow aren't a SHA512 hash. It looks like it was run
> through base64.
>
> I read this:
> http://www.aychedee.com/2012/03/14/etc_shadow-password-hash-formats/
> But Fedora doesn't have mkpasswd by default, whereas passwd seems to
> only update shadow rather than outputting to stdout. And if there's a
> salt used I can't tell how that would be referenced.
>
> Thanks,
>
>
Why not just download
http://mirrors.kernel.org/fedora/releases/21/Everything/source/SRPMS/p/asswd-0.79.tar.bz2 

and read the source code :)
There are macros you will need to look at as well