PHP实现AES256加密算法实例_php技巧

本文实例讲述了PHP实现AES256加密算法的方法，是较为常见的一种加密算法。分享给大家供大家参考。具体如下：

aes.class.php文件如下：

 6 && $i%$Nk == 4) { 
    $temp = self::subWord($temp); 
   } 
   for ($t=0; $t

aesctr.class.php文件如下：

>> operator nor unsigned ints 
  * 
  * @param a number to be shifted (32-bit integer) 
  * @param b number of bits to shift a to the right (0..31) 
  * @return  a right-shifted and zero-filled by b bits 
  */ 
 private static function urs($a, $b) { 
  $a &= 0xffffffff; $b &= 0x1f; // (bounds check) 
  if ($a&0x80000000 && $b>0) {  // if left-most bit set 
   $a = ($a>>1) & 0x7fffffff;  //  right-shift one bit & clear left-most bit 
   $a = $a >> ($b-1);      //  remaining right-shifts 
  } else {            // otherwise 
   $a = ($a>>$b);        //  use normal right-shift 
  }  
  return $a;  
 } 
}  
?>

Demo实例程序如下：

'; 
 
$mstr = AesCtr::encrypt('Hello World', 'key', 256); 
echo "Encrypt String : $mstr
"; 
 
$dstr = AesCtr::decrypt($mstr, 'key', 256); 
echo "Decrypt String : $dstr
"; 
 
echo 'each not change
'; 
 
$mstr = AesCtr::encrypt('Hello World', 'key', 256, 1); // keep=1 
echo "Encrypt String : $mstr
"; 
 
$dstr = AesCtr::decrypt($mstr, 'key', 256); 
echo "Decrypt String : $dstr
"; 
?> 

这里再介绍另一使用 PHP mcrypt 加解密方法：

/* aes 256 encrypt 
* @param String $ostr 
* @param String $securekey 
* @param String $type encrypt, decrypt 
*/ 
function aes($ostr, $securekey, $type='encrypt'){ 
  if($ostr==''){ 
    return ''; 
  } 
   
  $key = $securekey; 
  $iv = strrev($securekey); 
  $td = mcrypt_module_open('rijndael-256', '', 'ofb', ''); 
  mcrypt_generic_init($td, $key, $iv); 
 
  $str = ''; 
 
  switch($type){ 
    case 'encrypt': 
      $str = base64_encode(mcrypt_generic($td, $ostr)); 
      break; 
 
    case 'decrypt': 
      $str = mdecrypt_generic($td, base64_decode($ostr)); 
      break; 
  } 
 
  mcrypt_generic_deinit($td); 
 
  return $str; 
} 
 
// Demo 
$key = "fdipzone201314showmethemoney!@#$"; 
$str = "show me the money"; 
 
$ostr = aes($str, $key); 
echo "String 1: $ostr
"; 
 
$dstr = aes($ostr, $key, 'decrypt'); 
echo "String 2: $dstr
";

希望本文所述对大家php程序设计的学习有所帮助。