Re: Using mcrypt in PHP

hopefully someone who knows what they're doing can reply to you, but in the meantime this should get you going - it works for me: $td = mcrypt_module_open(MCRYPT_TripleDES, "", MCRYPT_MODE_ECB, "/usr/lib/mcrypt-modes"); $iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND); mcrypt_generic_init($td, "your key string here", $iv); then just use mdecrypt_generic($td, $data) and mcrypt_generic($td, $data) where $data is your string to encrypt ----- Original Message ----- From: "Dr. Evil" <drevil@sidereal.kz> To: <php-general@lists.php.net> Sent: Monday, August 20, 2001 11:03 AM Subject: [PHP] Using mcrypt in PHP > > There seems to be no reliable information in the manual about how to > do this. I'm trying to use mcrypt 2.4 with php4.06, which should be a > compatible combination. > > So far, I have gotten it to work like this: > > $cypher = MCRYPT_RIJNDAEL_128; > $encrypted = mcrypt_encrypt($cypher, $key, $plaintext, MCRYPT_MODE_ECB); > $decrypted = mcrypt_decrypt($cypher, $key, $encrypted, MCRYPT_MODE_ECB); > > However, when I do this, I get an error saying: > > Warning: attempt to use an empty IV, which is NOT recommend in > > So I tried to do the same thing with an IV: > > $iv = mcrypt_create_iv(mcrypt_get_iv_size($cypher, MCRYPT_MODE_ECB), > MCRYPT_RANDOM); > > and then added this $iv as an argument to encrypt and decrypt. At > this point, it doesn't work, because the iv is different in the > encrypt and decrypt functions, because it is randonly generated. Is > it true that I need the same iv to encrypt as to decrypt? I'm just > not understanding how to use this. All I want to do is to encrypt > stuff and then decrypt it, using a key, right? It used to work. > > Thanks. > > -- > PHP General Mailing List (http://www.php.net/) > To unsubscribe, e-mail: php-general-unsubscribe@lists.php.net > For additional commands, e-mail: php-general-help@lists.php.net > To contact the list administrators, e-mail: php-list-admin@lists.php.net > >