I've read the following thread in your mailing list
archive.
From: Paulo Soares <psoares@(protected)...>
RE: strange signature creation in itext
2005-09-28 01:54
There's nothing strange with that. All te pdfs
have
an internal creation
date and that alone would be enough to get a
different hash.
-----Original Message-----
From: Tamas Nemeth
[mailto:szederkertiparazna@(protected)...]
Sent: Tuesday, September 27, 2005 11:16 PM
To: itext-questions@(protected)
Subject: strange signature creation in itext
Hi!
I'm trying to create command line pdf signer,
which creates a signed
pdf in 2 part. First an external program calls
me
to get a hash (my
program creates the hash and gives back to the
external program), then
the external program creates a pkcs7 file onto
that hash and gives
back to my command line program. After that my
command line program
inserts the hash into the pdf file.
This works good, but sometimes (10:1) I get
different hash when I
create hash, and when I try to insert the pkcs7
file into the pdf.
As I see iText sometimes creates different pdf
structure and that is
why I get different hash values. I can't see the
logic behind that.
Can somebody tell meg, why creates iText
different
structure
sometimes. Is there any way to always create the
same structure (hash)
onto the same pdf?
I have the same problem. So I don't think the
problem
of calculating different hashes is the internal
creation date because:
1. I've tried to put this creation date
programmatically through the following code:
Calendar cal = Calendar.getInstance();
long l = 1156153389444L;
cal.setTimeInMillis(l);
sap.setSignDate(cal);
, so the creation date is the same all the time.
2. The problem appears only on Linux(Trustix
Secure
Linux 3.0) OS. In Windows it works just fine - the
hash of given document is equal all times. On
Linux
the hash is same all the times only if the java
interpreter mode is chosen(java -Xint). But then
it
works 10 times slower. Java version on both OS :
jdk 1.5.0_02. IText version: itext-paulo-155.jar.
I hope you can help me fix this problem. Thanks in
advance!
Best regards,
Dimitar
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