note 111049 added to function.mcrypt-create-iv

In response to "hans at llis dot nl": Your example does generate a noise, you just made an error in your code example, and used MCRYPT_RAND instead of MCRYPT_DEV_RANDOM when re-generating the IV. Trying the following will result in random noise every time: <?php $td = mcrypt_module_open (MCRYPT_RIJNDAEL_256, "", MCRYPT_MODE_CBC, ""); $iv = mcrypt_create_iv (mcrypt_enc_get_iv_size ($td), MCRYPT_DEV_RANDOM); header("Content-type: image/png"); $img = imagecreatetruecolor(255,255); $ink = imagecolorallocate($img,255,255,255); for($i=0;$i<255;$i++) { for($j=0;$j<255;$j++) { $twobytes = substr ($iv, 0, 2); $iv = substr ($iv, 2); if (!strlen ($iv)) $iv = mcrypt_create_iv (mcrypt_enc_get_iv_size ($td), MCRYPT_DEV_RANDOM); //Corrected imagesetpixel($img, ord($twobytes[0]), ord($twobytes[1]), $ink); } } imagepng($img); imagedestroy($img); ?> ---- Server IP: 69.147.83.199 Probable Submitter: 94.142.229.4 ---- Manual Page -- http://php.net/manual/en/function.mcrypt-create-iv.php Edit -- https://master.php.net/note/edit/111049 Del: integrated -- https://master.php.net/note/delete/111049/integrated Del: useless -- https://master.php.net/note/delete/111049/useless Del: bad code -- https://master.php.net/note/delete/111049/bad+code Del: spam -- https://master.php.net/note/delete/111049/spam Del: non-english -- https://master.php.net/note/delete/111049/non-english Del: in docs -- https://master.php.net/note/delete/111049/in+docs Del: other reasons-- https://master.php.net/note/delete/111049 Reject -- https://master.php.net/note/reject/111049 Search -- https://master.php.net/manage/user-notes.php