PHP实现AES256加密算法实例(3)

<?php  
require 'aes.class.php';   // AES PHP implementation 
require 'aesctr.class.php'; // AES Counter Mode implementation  
 
echo 'each change<br>'; 
 
$mstr = AesCtr::encrypt('Hello World', 'key', 256); 
echo "Encrypt String : $mstr<br />"; 
 
$dstr = AesCtr::decrypt($mstr, 'key', 256); 
echo "Decrypt String : $dstr<br />"; 
 
echo 'each not change<br>'; 
 
$mstr = AesCtr::encrypt('Hello World', 'key', 256, 1); // keep=1 
echo "Encrypt String : $mstr<br />"; 
 
$dstr = AesCtr::decrypt($mstr, 'key', 256); 
echo "Decrypt String : $dstr<br />"; 
?>