class ption
{
private static $original = array('=','+','/');
private static $later = array('O0O0O','o0O0o','oo00o');
function __construct()
{
}
private static function md5($skey = '')
{
$skey = $skey ? $skey : 'ui' ; //uicms::_config('security/authkey');
return md5(substr($skey,16));
}
/**
* @use ption::en($string,$key);
* @param String $string 需要加密的字串
* @param String $skey 密钥
* @param int $expiry 密文有效期,加密时候有效, 单位 秒,0 为永久有效
* @return String
*/
static public function en($string = '',$skey = '',$expiry=0)
{
if( is_array( $string ) )
{
$string = json_encode($string); // uicms::json($string,true,'en');
}
$string = str_pad($expiry ? $expiry + TIME : 0,10,0).$string;
$strArr = str_split(base64_encode($string));
$strCount = count($strArr);
$skey = static::md5($skey);
foreach (str_split($skey) as $key => $value)
{
$key < $strCount && $strArr[$key].=$value;
}
return str_replace(self::$original,self::$later,join('',$strArr));
}
/**
* @use ption::de($string,$key);
* @param String $string 需要解密的字串
* @param String $skey 密钥
* @return String
*/
static public function de($string = '',$skey = '')
{
$strArr = str_split(str_replace(self::$later,self::$original,$string),2);
$strCount = count($strArr);
$skey = static::md5($skey);
foreach (str_split($skey) as $key => $value)
{
$key <= $strCount && $strArr[$key][1] === $value && $strArr[$key] = $strArr[$key][0];
}
$result = base64_decode(join('',$strArr));
if(substr($result,10) == 0 || substr($result,10) - TIME > 0)
{
return substr($result,10);
}
else
{
return false;
}
}
}