note 79135 added to function.mcrypt-module-open

Also it should be pointed that md5() and/or sha1() should not be used while forming your key for the mcrypt. This is so because hex encoding uses a set of only 16 characters [0-9a-f], which is equivalent to 4 bits, and thus halve the strength of your encryption: 4 x 32 = 128-bit. I have re-wrote the example shown, so here is my suggestion to get real 256-bit encryption: <?php $key1 = "this is a secret key"; $key2 = "this is the second secret key"; $input = "Let us meet at 9 o'clock at the secret place."; $length = strlen($input); /* Open the cipher */ $td = mcrypt_module_open('rijndael-256', '', 'cbc', ''); /* Create the IV and determine the keysize length, use MCRYPT_RAND * on Windows instead */ $iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND); $ks = mcrypt_enc_get_key_size($td); /* Create key */ $key1 = md5($key1); $key2 = md5($key2); $key = substr($key1, 0, $ks/2) . substr(strtoupper($key2), (round(strlen($key2) / 2)), $ks/2); $key = substr($key.$key1.$key2.strtoupper($key1),0,$ks); /* Intialize encryption */ mcrypt_generic_init($td, $key, $iv); /* Encrypt data */ $encrypted = mcrypt_generic($td, $input); /* Terminate encryption handler */ mcrypt_generic_deinit($td); /* Initialize encryption module for decryption */ mcrypt_generic_init($td, $key, $iv); /* Decrypt encrypted string */ $decrypted = mdecrypt_generic($td, $encrypted); /* Terminate decryption handle and close module */ mcrypt_generic_deinit($td); mcrypt_module_close($td); /* Show string */ echo "Text: ".substr($decrypted,0,$length) . "<br>"; echo "Encoded: ".$encrypted ."<br>"; echo "<br>key1: $key1 <br>key2: $key2<br>created key: $key"; ?> ---- Server IP: 195.149.248.161 Probable Submitter: 212.73.143.141 ---- Manual Page -- http://www.php.net/manual/en/function.mcrypt-module-open.php Edit -- https://master.php.net/note/edit/79135 Del: integrated -- https://master.php.net/note/delete/79135/integrated Del: useless -- https://master.php.net/note/delete/79135/useless Del: bad code -- https://master.php.net/note/delete/79135/bad+code Del: spam -- https://master.php.net/note/delete/79135/spam Del: non-english -- https://master.php.net/note/delete/79135/non-english Del: in docs -- https://master.php.net/note/delete/79135/in+docs Del: other reasons-- https://master.php.net/note/delete/79135 Reject -- https://master.php.net/note/reject/79135 Search -- https://master.php.net/manage/user-notes.php