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Date: Thu, 13 Nov 2014 21:20:48 -0600
From: "Michael S. Proctor" <michael.wolfie.proctor@....net>
To: john-users@...ts.openwall.com
Subject: Re: New tool in JtR toolset (and common code)
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Thanks Jim. Looks like you've been busy!
Have a great one,
Mike
On 11/13/2014 2:52 PM, jfoug@....net wrote:
> There is a new tool that will be build (in the latest git bleeding
> JtR). The tool is base64conv, and will be built in ./run. This
> tool will convert between any formats: raw, hex (upper/lower
> case), mime-base64, crypt-base64 and a byte swapped crypt-base64.
>
> This new 'tool' is simply a command line wrapper around the
> internal convert function. This function is now being used in a
> few places in JtR, and it will start to replace a lot fo one-off
> custom code in dozens (if not hundreds) of hash formats. I wrote
> this common code, after doing conversions of one base-64 flavor
> into another to make things like handling cisco8 or cisco9 formats
> easy. Cisco8 is almost identical to pbkdf2-hmac-sha256, except
> for the encoding (and primary format signature). But with this
> conversion function, I was able to use the original
> pbkdf2-hmac-sha256-fmt.c source code, and simply add a few lines to
> a prepare() function and magically cisco8 works. For cisco9, it
> was almost identical to scrypt, again, other than the base64
> encoding (and the signature used to pass N, r and p variables).
> Well, with the base64 convert function this was trivial to add to
> the existing scrypt format, by simply adding a little into the
> prepare function.
>
> Shortly after this, I found one of the git issues, and that was to
> support the perl ScryptKDF.pm format. Again, that was trivial to
> add into the existing scrypt format, by simply converting the
> base64 string (and the N, r, p variable layouts).
>
> Here is a real quick 'circular' example of conversions:
>
> $ ../run/base64conv -i raw -o crypt ThisIsATestMessage
> ThisIsATestMessage --> J4VdQoZnEJFZQrFBNLBnMKRZ
>
> $ ../run/base64conv -i crypt -o mime J4VdQoZnEJFZQrFBNLBnMKRZ
> J4VdQoZnEJFZQrFBNLBnMKRZ --> VGhpc0lzQVRlc3RNZXNzYWdl
>
> $ ../run/base64conv -i mime -o hex VGhpc0lzQVRlc3RNZXNzYWdl
> VGhpc0lzQVRlc3RNZXNzYWdl -->
> 54686973497341546573744d657373616765
>
> $ ../run/base64conv -i hex -o raw
> 54686973497341546573744d657373616765
> 54686973497341546573744d657373616765 --> ThisIsATestMessage
>
> Jim.
>
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