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Date: Thu, 24 Jan 2013 21:30:44 +0530
From: Dhiru Kholia <>
Subject: Re: PDF format incompatibility (jumbo-7 vs. jumbo-8)

On Thu, Jan 24, 2013 at 9:19 PM, Frank Dittrich
<> wrote:
> On 01/24/2013 04:30 PM, Dhiru Kholia wrote:
>> On Thu, Jan 24, 2013 at 8:53 PM, Frank Dittrich
>> <> wrote:
>>> On 01/24/2013 03:27 PM, Dhiru Kholia wrote:
>>>> A simple (but probably unpopular) fix is to reject old-style hashes.
>>> I am sure Solar wouldn't call breaking backwards compatibility a fix.
>> I was not careful enough to maintain backwards compatibility when I
>> wrote the new pdf format.
> OK, but the "$pdf$Standard*" hash should contain all the information
> required to construct the hash format which is expected by the jumbo-8
> valid(), no?

I think so.

> If all information is there, it should be possible to write a prepare()
> function which converts the old-style hash into the new one.

Yes, it is possible. Why can't we handle old-style hashes in valid and
get_salt instead of prepare?

I haven't used prepare so far, so I don't know its "powers".


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