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Bug #52801 getimageblob() on Imagick object from tiff file produces random md5 hashes
Submitted: 2010-09-09 00:20 UTC Modified: 2010-09-09 01:00 UTC
From: matvey at copters dot ru Assigned:
Status: Not a bug Package: *Graphics related
PHP Version: 5.2SVN-2010-09-08 (SVN) OS: Linux Debian Lenny 64
Private report: No CVE-ID: None
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 [2010-09-09 00:20 UTC] matvey at copters dot ru
Description:
------------
$this->insecure     = new Imagick("file.tiff");
$this->originalhash = hash('md5', $this->insecure->getimageblob());
$this->originalhash is always different, but file.tiff is always the same.

Test script:
---------------
$ob   = new Imagick("file.tiff");
$hash = hash('md5', $ob->getimageblob());


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 [2010-09-09 00:31 UTC] matvey at copters dot ru
rgp@cp ~/src $ cat s.php
<?php
$s = array(
  1,
  2,
  3,
  4,
  5,
  6,
  7,
  8,
  9,
  10,
);

foreach ($s as $t) {
  $ob = new Imagick("test.tif");
  $hash = hash('md5', $ob->getimageblob());
  echo "{$hash} \n";
}
?>
rgp@cp ~/src $ php -f s.php 
3a0eff2dc635064f91f9720e4f02fc25 
0e15adc163724345c26305df4cb2faed 
0e15adc163724345c26305df4cb2faed 
a6577644313c4fbd5014028c16a78e84 
dd391a6977cc7a6af56037959d607c90 
dd391a6977cc7a6af56037959d607c90 
83caff49e5d8abe704cf8c298770314f 
e85136bd4259b4b18e8f0bbc9867da9b 
36bdf4fc1806f83040b71a7214cc1d4c 
491f7bc84db9b83602f9d5ebc13f530a
 [2010-09-09 01:00 UTC] pajoye@php.net
-Status: Open +Status: Bogus
 [2010-09-09 01:00 UTC] pajoye@php.net
Report bugs about pecl's package to pecl please.

Tip: float are not an exact science and tiff can use floats.
 [2010-09-09 01:22 UTC] matvey at copters dot ru
Ok, but why on earth the same file.tiff hash_file('md5', 'file.tiff'); produces 
constant values?

Thanx for the tip.
 [2010-09-09 01:24 UTC] matvey at copters dot ru
rgp@cp ~/src $ cat f.php 
<?php
$s = array(
  1,
  2,
  3,
  4,
  5,
  6,
  7,
  8,
  9,
  10,
);

foreach ($s as $t) {
  $hash = hash_file('md5', "test.tif");
  echo "{$hash} \n";
}
?>
rgp@cp ~/src $ php -f f.php 
be42c81505f2c9ef70994c60915a3f12 
be42c81505f2c9ef70994c60915a3f12 
be42c81505f2c9ef70994c60915a3f12 
be42c81505f2c9ef70994c60915a3f12 
be42c81505f2c9ef70994c60915a3f12 
be42c81505f2c9ef70994c60915a3f12 
be42c81505f2c9ef70994c60915a3f12 
be42c81505f2c9ef70994c60915a3f12 
be42c81505f2c9ef70994c60915a3f12 
be42c81505f2c9ef70994c60915a3f12
 
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