Hi to all.
How can I make my signature only with a Byte range in two parts ?
I'm building the messagedigest to invoke my p7 construtor, then when the
iText builds the byterange in 3 parts ?
When I execute sample "external has and signature in Windows Certificate
Mode" , i only find byte range divides in two parts. What's diference from
my code that divide in 3 blocs ?
How can I exclude the contents?
A lot of thanks.
From: "Paulo Soares" <[EMAIL PROTECTED]>
Reply-To: "Paulo Soares" <[EMAIL PROTECTED]>
To: "Juan Sanchez"
<[EMAIL PROTECTED]>,<itext-questions@lists.sourceforge.net>,"Leonard
Rosenthol" <[EMAIL PROTECTED]>
Subject: Re: [iText-questions] Add signatures in a existing blank
signature
Date: Fri, 12 Aug 2005 00:15:22 +0100
In theory Acrobat doesn't care but in practice, at least with Acrobat 6, if
the byte range has more than one exclude section it always fails. Other
Acrobat plug-in may behave differently but with the standard crypto that's
what I see.
----- Original Message -----
From: "Leonard Rosenthol" <[EMAIL PROTECTED]>
To: "Paulo Soares" <[EMAIL PROTECTED]>; "Juan Sanchez"
<[EMAIL PROTECTED]>; <itext-questions@lists.sourceforge.net>
Sent: Thursday, August 11, 2005 8:45 PM
Subject: Re: [iText-questions] Add signatures in a existing blank signature
> At 12:36 PM 8/11/2005, Paulo Soares wrote:
> >As I said, if you want Acrobat to verify the signature you can only
exclude
> >the Contents from the byte range.
>
> Assuming that is what is being hashed and marked as such.
>
> You can actually exclude anything you want - and as long as
> your byte ranges and hashes match, Acrobat doesn't care what you've
excluded.
>
> It is, however, a potential security hole to exclude
> anything else - but there may be good reason.
>
>
> Leonard
>
>
>
>
--------------------------------------------------------------------------
-
> Leonard Rosenthol
<mailto:[EMAIL PROTECTED]>
> Chief Technical Officer <http://www.pdfsages.com>
> PDF Sages, Inc. 215-938-7080 (voice)
> 215-938-0880 (fax)
>
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