You should ask whoever did the Linux Java why the results are different
between the compiler and the interpreter. I don't see anything for iText
to fix.
Paulo
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On
> Behalf Of Dimiter Nikolov
> Sent: Tuesday, January 16, 2007 12:52 PM
> To: itext-questions@lists.sourceforge.net
> Subject: [iText-questions] Problem with calculating hash in IText
>
> I've read the following thread in your mailing list
> archive.
> From: Paulo Soares <[EMAIL 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:[EMAIL PROTECTED]
> Sent: Tuesday, September 27, 2005 11:16 PM
> To: [EMAIL PROTECTED]; Paulo Soares
> 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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