note 69469 added to ref.mcrypt

From: Date: Thu, 07 Sep 2006 01:49:46 +0000
Subject: note 69469 added to ref.mcrypt
Groups: php.notes 
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For those looking for a mysql_aes_decrypt, I created this method, referencing rolf's aes_encrypt below. Since the aes_encrypt right-pads N * blocksize with any chr( 0 ) to chr( 16 ) (random based on the input string length) we first decrypt the text, then RTrim chr(0 .. 16) depending on its trailing ord() value. mysql AES_DECRYPT() compatibly function for PHP : <? function mysql_aes_decrypt( $val, $ky ) { $mode = MCRYPT_MODE_ECB; $enc = MCRYPT_RIJNDAEL_128; $dec = @mcrypt_decrypt($enc, $ky, $val, $mode, @mcrypt_create_iv( @mcrypt_get_iv_size($enc, $mode), MCRYPT_DEV_URANDOM ) ); return rtrim( $dec, ( ( ord(substr( $dec, strlen( $dec )-1, 1 )) >= 0 and ord(substr( $dec, strlen( $dec )-1, 1 ) ) <= 16 ) ? chr(ord(substr( $dec, strlen( $dec )-1, 1 ))): null) ); } ?> Please note that if the strlen($ky)>16 then this function will not be compatible. ---- Server IP: 66.163.161.117 Probable Submitter: 71.219.21.71 ---- Manual Page -- http://www.php.net/manual/en/ref.mcrypt.php Edit -- https://master.php.net/note/edit/69469 Del: integrated -- https://master.php.net/note/delete/69469/integrated Del: useless -- https://master.php.net/note/delete/69469/useless Del: bad code -- https://master.php.net/note/delete/69469/bad+code Del: spam -- https://master.php.net/note/delete/69469/spam Del: non-english -- https://master.php.net/note/delete/69469/non-english Del: in docs -- https://master.php.net/note/delete/69469/in+docs Del: other reasons-- https://master.php.net/note/delete/69469 Reject -- https://master.php.net/note/reject/69469 Search -- https://master.php.net/manage/user-notes.php

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