Bug #49561 [Ver->Wfx]: mcrypt warns about having no IV in ECB mode
Edit report at http://bugs.php.net/bug.php?id=49561&edit=1
ID: 49561
Updated by: mike@php.net
Reported by: terrafrost@php.net
Summary: mcrypt warns about having no IV in ECB mode
-Status: Verified
+Status: Wont fix
Type: Bug
Package: mcrypt related
Operating System: *
PHP Version: 5.2.10
New Comment:
No upstream activity since years.
Previous Comments:
------------------------------------------------------------------------
[2009-09-21 12:26:52] sjoerd@php.net
Filed bug:
https://sourceforge.net/tracker/?func=detail&aid=2863450&group_id=87941&atid=584893
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[2009-09-20 18:17:57] sjoerd@php.net
I think this is a bug in mcrypt. The libmcrypt function
mcrypt_enc_get_iv_size returns 16 for ECB. The manual says: "If it is
0 then the IV is ignored in that algorithm," which implies that
mcrypt_enc_get_iv_size should return 0 when the mode is ECB.
C-code example:
#include "mcrypt.h"
#include <stdio.h>
int main()
{
MCRYPT td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, NULL, MCRYPT_ECB,
NULL);
printf("IV size for ECB: %d\n", mcrypt_enc_get_iv_size(td)); // prints
'16'
}
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[2009-09-15 12:58:34] terrafrost@php.net
Description:
------------
mcrypt complains about their being no IV even if ECB mode is being used.
Since ECB mode doesn't use IVs, it seems like no such warning should be
produced.
Bug #43143 is fairly similar to this one, except that that one produced
a slightly different error. Also, that one was closed on the basis that
it had been fixed.
Reproduce code:
---------------
<?php
$td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_ECB, '');
mcrypt_generic_init($td, 'aaaaaaaaaaaaaaaa', '');
?>
Expected result:
----------------
I would expect that to just run its course and output nothing.
Actual result:
--------------
I get the following:
Warning: mcrypt_generic_init(): Iv size incorrect; supplied length: 0,
needed: 16 in C:\php\test.php on line 3
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