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Date: Tue, 1 Sep 2009 08:48:52 -0600
From: RB <aoz.syn@...il.com>
To: john-users@...ts.openwall.com
Subject: Re: Some help

On Tue, Sep 1, 2009 at 08:01, Lee Hambley<lee.hambley@...il.com> wrote:
> Is there a reference of how to identify hashes?

Generally speaking, no - context-free hashes can pretty easily look
like each other; many are recognized by length.  Because of this (and
varying hashing schemes), UNIX-like systems usually prefix a
designator to their hashes, which is usually documented in the
system's crypt(3).  JtR's code (specifically src/*_fmt.c) is the
single most complete, centralized documentation I know of.  If you
read through some of those files, you'll notice that a lot of the
identification is programmatic - length is only one of many
calculations to see if a hash is a particular format.


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