PHP中如何实现AES-256加密？

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phpclass Aes{ static public $mode=MCRYPT_MODE_NOFB;

static public function generateKey($length=32) { if (!in_array($length, array(16, 24, 32))) return False;

$str=''; for ($i=0; $i < $length; $i++) $str .=chr(rand(33, 126));

return $str; }}

class aes { static public $mode = MCRYPT_MODE_NOFB; static public function generateKey($length=32) { if (!in_array($length,array(16,24,32))) return False; $str = ''; for ($i=0;$i<$length;$i++) { $str .= chr(rand(33,126)); } return $str; } static public function encrypt($data, $key) { if (strlen($key) > 32 || !$key) return trigger_error('key too large or key is empty.', E_USER_WARNING) && False; $ivSize = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, self::$mode); $iv = mcrypt_create_iv($ivSize, (substr(PHP_OS,0,1) == 'W' ? MCRYPT_RAND : MCRYPT_DEV_URANDOM )); $encryptedData = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $key, $data, self::$mode, $iv); $encryptedData = $iv . $encryptedData; return base64_encode($encryptedData); } static public function decrypt($data, $key) { if (strlen($key) > 32 || !$key) return trigger_error('key too large or key is empty.', E_USER_WARNING) && False; $data = base64_decode($data); if (!$data) return False; $ivSize = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, self::$mode); $iv = substr($data, 0, $ivSize); $data = substr($data, $ivSize); $decryptData = mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $key, $data, self::$mode, $iv); return $decryptData; }}