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Bug #47467 The crc32b polynomial result has a wrong endianess
Submitted: 2009-02-20 21:24 UTC Modified: 2009-02-27 20:47 UTC
From: php at twinmail dot de Assigned: pajoye (profile)
Status: Not a bug Package: hash related
PHP Version: 5.2.8 OS: *
Private report: No CVE-ID: None
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 [2009-02-20 21:24 UTC] php at twinmail dot de 
Description:
------------
The polynomial result of the crc32b hash function has since 5.2.8 a wrong byte endianess on Windows. This also affects the CVS snapshot. I cannot reproduce this error on any linux (debian / debian / gentoo / opensuse) box I have, so I think this bug only affects Windows versions.

I tested different versions of PHP on my Windows system:

PHP 5.2.9RC4-dev (cli) (built: Feb 20 2009 15:57:39): affected
PHP 5.2.8 (cli) (built: Dec  8 2008 19:31:23): affected
PHP 5.2.6 (cli) (built: May  2 2008 18:02:07): NOT affected

The bug #45028 is maybe related to this one.

Reproduce code:
---------------
print hash('crc32b', 'Lorem Ipsum');

Expected result:
----------------
5dd48a35

Actual result:
--------------
358ad45d

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 [2009-02-20 22:21 UTC] pajoye@php.net 
Windows has no specific endianess but the processor. However I can reproduce on windows (vc6 and vc9). Weird, needs more analyze.
 [2009-02-27 14:33 UTC] pajoye@php.net 
Are you sure you are using the same PHP version on all systems (try 5.2.8 on linux)?

I can't reproduce the problem on any of my tests hosts. The only difference is with php version prior to 5.2.6, but that's due to the bug #45028 which is now fixed.
 [2009-02-27 20:35 UTC] php at twinmail dot de 
You are right: I tested this issue against PHP versions on linux which were below 5.2.8 and therefore affected by #45028. Before posting a new bug I also checked against some online calculators of crc32b, but they were also affected by #45028. So I thought "5dd48a35" is the correct result, but it isn't! "358ad45d" is indeed the correct result, so PHP 5.2.8 is correctly calculating crc32b.

This means everything is fine, except that I am an idiot! ;-) Sorry for reporting this "bug".
 [2009-02-27 20:47 UTC] pajoye@php.net 
Not a bug > bogus.
 
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