}
} else {
$aesops->encryptCBC($key, $states, $results);
}
break;
case "decrypt":
if ($_POST['mode'] == 'ecb') {
foreach ($states as $state) {
array_push($results, $aesops->decrypt($state, $key));
}
} else {
$aesops->decryptCBC($key, $states, $results);
}
break;
case "invSubBytes":
$result = $aesops->invSubBytes($state);
break;
case "invShiftRows":
$result = $aesops->invShiftRows($state);
break;
case "invMixColumns":
$result = $aesops->invMixColumns($state);
break;
default:
$_SESSION['debug'] .= "\n Error, operation not valid";
}
// now convert back the final state to output
foreach ($results as $result) {
$output .= $iop->convertStateToByteArray($result);
}
$_SESSION['debug'] .= "\n\nThe hexadecimal result of the " . $operation . " operation:\n{$output}\n";
