[PHP] recent encrpyt decrypt code... (problems)

[Jeff Bluemel]

I've seen a few other post on this, and it sounds like there is more then
one of use that is trying this script.  I've got it so that I can use the
commands, but I still get errors on the page...

here is what I have done.

I downloaded libmycrpt from
ftp://mcrypt.hellug.gr/pub/crypto/mcrypt/libmcrypt and configured it with
the following options;

./configure \
 --with-included-algos="rijndael-128 arcfour stream cbc cfb"\
 --disable-posix-threads

I then reconfigured php with the --with-mcrpty option.  now when I try to
run the code I get the following errors;  (the php code I will repost inc
ase there are any questions)

 Usage
Warning: key size is 0 in /usr/local/apache/htdocs/test.phtml on line 15

Warning: mcrypt_generic_init: Key length incorrect in
/usr/local/apache/htdocs/test.phtml on line 15

Warning: mcrypt_generic(): 1 is not a valid MCrypt resource in
/usr/local/apache/htdocs/test.phtml on line 16

Warning: mcrypt_generic_deinit(): 1 is not a valid MCrypt resource in
/usr/local/apache/htdocs/test.phtml on line 17
encrypted =

Warning: key size is 0 in /usr/local/apache/htdocs/test.phtml on line 25

Warning: mcrypt_generic_init: Key length incorrect in
/usr/local/apache/htdocs/test.phtml on line 25

Warning: mdecrypt_generic(): 2 is not a valid MCrypt resource in
/usr/local/apache/htdocs/test.phtml on line 26

Warning: mcrypt_generic_deinit(): 2 is not a valid MCrypt resource in
/usr/local/apache/htdocs/test.phtml on line 29
decrypted =
Oops they don't match



<?PHP
class encrypt_decrypt
{
        var $secret;
        function encrypt_class(){
                $this->secret = 'this is a very long key, even too long for
the cipher';
        }
        Function encode($id){
                $eid = $iv = 0;
                $len = strlen($id);
                $id = $len.'-'.$id;
                $td = mcrypt_module_open(MCRYPT_TripleDES, "",
MCRYPT_MODE_ECB, "");
                $key = substr($this->secret, 0, mcrypt_enc_get_key_size
($td));
                $iv = pack("a".mcrypt_enc_get_iv_size($td),$iv);
                mcrypt_generic_init ($td, $key, $iv);
                $eid = base64_encode(mcrypt_generic ($td, $id));
                mcrypt_generic_deinit($td);
          return $eid;
        }
        Function decode($eid){
                $id = $iv = 0;
                $td = mcrypt_module_open (MCRYPT_TripleDES, "",
MCRYPT_MODE_ECB, "");
                $key = substr($this->secret, 0, mcrypt_enc_get_key_size
($td));
                $iv = pack("a".mcrypt_enc_get_iv_size($td),$iv);
                mcrypt_generic_init ($td, $key, $iv);
                $id = mdecrypt_generic ($td, base64_decode($eid));
                $len = strtok($id,'-');
                $id = substr($id,(strlen($len)+1),$len);
                mcrypt_generic_deinit($td);
                return $id;
        }
}
?>

Usage

<?
$word = 'Hello';
$e = new encrypt_decrypt();
$encrypted = $e->encode($word);
echo "encrypted = $encrypted <br>";
$decrypted = $e->decode($encrypted);
echo "decrypted = $decrypted <br>";
if($word == $decrypted){
        echo "They match <br>";
}
else{
        echo "Oops they don't match <br>";
}
?>


--
Jeff Bluemel



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