[PHP] attempt to use an empty IV with mcrypt

[twm139]

I get the following warning when I turn on logging...


Warning: attempt to use an empty IV, which is NOT recommend in
/home/local/apache/htdocs/encrypt.php on line 21


Here is the code


$key = "testing";
$input = "Secret data";

$encrypted_data = mcrypt_ecb (MCRYPT_DES, $key, $input, MCRYPT_ENCRYPT);

print "The CypherText in DES ECB is <BR>".bin2hex
($encrypted_data)."\n<br>";


$encrypted_data = mcrypt_ecb (MCRYPT_TWOFISH, $key, $input,
MCRYPT_ENCRYPT);

print "The CypherText in TWOFISH ECB is <BR>".bin2hex
($encrypted_data)."\n<br>";

$encrypted_data = mcrypt_cbc (MCRYPT_TWOFISH, $key, $input,
MCRYPT_ENCRYPT);

print "The CypherText in TWOFISH CBC is <BR>".bin2hex
($encrypted_data)."\n<br>";

?>

How do I prevent this error?

Regards

Terrence


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