Bug #55169 [Com]: mcrypt_create_iv always fails to gather sufficient random data

Edit report at https://bugs.php.net/bug.php?id=55169&edit=1 ID: 55169 Comment by: nikic@php.net Reported by: nikic@php.net Summary: mcrypt_create_iv always fails to gather sufficient random data Status: Feedback Type: Bug Package: mcrypt related Operating System: Windows 7 PHP Version: 5.4SVN-2011-07-09 (snap) Block user comment: N Private report: N New Comment: Just tried the snap for 312201, too, and it seems to work there too. Does that mean that either 312202 or 312203 broke it? D:\htdocs\stack>C:\php312201\php.exe -f quick.php string(1) "B" Previous Comments: ------------------------------------------------------------------------ [2011-07-10 11:09:43] nikic@php.net I just tried snaps for 312169 and 312203. The former still worked, but the latter was already broken: D:\htdocs\stack>C:\php312169\php.exe -f quick.php string(1) "ð" D:\htdocs\stack>C:\php312203\php.exe -f quick.php Fatal error: mcrypt_create_iv(): Could not gather sufficient random data in D:\h tdocs\stack\quick.php on line 3 ------------------------------------------------------------------------ [2011-07-10 10:37:24] pajoye@php.net I apply a fix to all branches (5.3 was possibly affected as well). Please try a snapshot with the revision id equal or higher to the commit referred here. ------------------------------------------------------------------------ [2011-07-10 10:36:31] pajoye@php.net Automatic comment from SVN on behalf of pajoye Revision: http://svn.php.net/viewvc/?view=revision&amp;revision=313110 Log: - fix bug #55169, mcrypt_create_iv always fails to gather sufficient random data ------------------------------------------------------------------------ [2011-07-09 16:26:20] nikic@php.net Some further notes: The code always fails, not just sometimes. It fails regardless of the specified size. It worked on PHP 5.3.1 (haven't tested later versions). ------------------------------------------------------------------------ [2011-07-09 16:23:21] nikic@php.net Description: ------------ When using the 5.4 snaps calling mcrypt_create_iv with either MCRYPT_DEV_RANDOM or MCRYPT_DEV_URANDOM as source always fails to gather sufficient random data regardless of the specified size. (Could be related: http://svn.php.net/viewvc?view=revision&revision=312201 ) Test script: --------------- <?php var_dump(mcrypt_create_iv(1, MCRYPT_DEV_URANDOM)); Expected result: ---------------- string 'm' (length=1) [or similar] Actual result: -------------- Fatal error: mcrypt_create_iv() [<a href='function.mcrypt-create-iv'>function.mcrypt-create-iv</a>]: Could not gather sufficient random data in D:\htdocs\stack\quick.php on line 3 ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=55169&edit=1