Penetration Testing: Cisco Secret 5 algorithm?

["Jeroen" <jeroen () isvet nl>]

Unknown User wrote:

> I have recovered some cisco passwords that are encrypted using the
> secret 5 format. They look like this
>
> $1$Wgqc$sbb8R/2rtOhc7t86J5axj.
>
> The question is can i simply plug this into a standard unix type
> shadow file format and use john to crack. I've tried this but I'm not
> convinced that John is actually working. Its also incrediblly slow.
> Any other tools available to crack these types of passwords.

I know tomas and Cain. But actually I'm looking for the algorithm used. As
far as I know right now it's a BASE64 of a MD5 with a salt in it. And the
last part is unknown to me... Can anyone help me out with some
hints/links/source? Cause this might me an interesting project for hardware
integration (= FAST!).


Greets,

Jeroen



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