#39498 [NEW]: ext/mcrypt/mcrypt.c hardcoded to use /dev/random

From: Date: Mon, 13 Nov 2006 15:48:11 +0000
Subject: #39498 [NEW]: ext/mcrypt/mcrypt.c hardcoded to use /dev/random
Groups: php.bugs 
Request: Send a blank email to php-bugs+get-104913@lists.php.net to get a copy of this message 
From:             mark at exonetric dot com
Operating system: Linux 2.6/Debian Etch
PHP version:      4.4.4
PHP Bug Type:     Performance problem
Bug description:  ext/mcrypt/mcrypt.c hardcoded to use /dev/random

Description:
------------
mcrypt.c appears to be written to use /dev/random for entropy in all
cases. As good entropy is a limited resource when obtained from
/dev/random, code that makes frequent calls to mcrypt routines that
require entropy can block waiting for entropy unexpectedly. 

 PHP_FUNCTION(mcrypt_create_iv) should be modified to permit configuration
of /dev/random or /dev/urandom at least at compile time if not at run time.

Reproduce code:
---------------
any code that calls mcrypt routines frequently

Expected result:
----------------
if called frequently enough, will block waiting for entropy.


-- 
Edit bug report at http://bugs.php.net/?id=39498&edit=1
-- 
Try a CVS snapshot (PHP 4.4): http://bugs.php.net/fix.php?id=39498&r=trysnapshot44
Try a CVS snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=39498&r=trysnapshot52
Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=39498&r=trysnapshot60
Fixed in CVS:                 http://bugs.php.net/fix.php?id=39498&r=fixedcvs
Fixed in release:             http://bugs.php.net/fix.php?id=39498&r=alreadyfixed
Need backtrace:               http://bugs.php.net/fix.php?id=39498&r=needtrace
Need Reproduce Script:        http://bugs.php.net/fix.php?id=39498&r=needscript
Try newer version:            http://bugs.php.net/fix.php?id=39498&r=oldversion
Not developer issue:          http://bugs.php.net/fix.php?id=39498&r=support
Expected behavior:            http://bugs.php.net/fix.php?id=39498&r=notwrong
Not enough info:              http://bugs.php.net/fix.php?id=39498&r=notenoughinfo
Submitted twice:              http://bugs.php.net/fix.php?id=39498&r=submittedtwice
register_globals:             http://bugs.php.net/fix.php?id=39498&r=globals
PHP 3 support discontinued:   http://bugs.php.net/fix.php?id=39498&r=php3
Daylight Savings:             http://bugs.php.net/fix.php?id=39498&r=dst
IIS Stability:                http://bugs.php.net/fix.php?id=39498&r=isapi
Install GNU Sed:              http://bugs.php.net/fix.php?id=39498&r=gnused
Floating point limitations:   http://bugs.php.net/fix.php?id=39498&r=float
No Zend Extensions:           http://bugs.php.net/fix.php?id=39498&r=nozend
MySQL Configuration Error:    http://bugs.php.net/fix.php?id=39498&r=mysqlcfg

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