#39498 [Opn->Bgs]: ext/mcrypt/mcrypt.c hardcoded to use /dev/random

From: Date: Mon, 13 Nov 2006 15:58:15 +0000
Subject: #39498 [Opn->Bgs]: ext/mcrypt/mcrypt.c hardcoded to use /dev/random
References: 1  Groups: php.bugs 
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 ID:               39498
 Updated by:       tony2001@php.net
 Reported By:      mark at exonetric dot com
-Status:           Open
+Status:           Bogus
 Bug Type:         Performance problem
 Operating System: Linux 2.6/Debian Etch
 PHP Version:      4.4.4
 New Comment:

You can use MCRYPT_DEV_URANDOM and get the data for /dev/urandom.


Previous Comments:
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[2006-11-13 15:48:11] mark at exonetric dot com

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.



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