PHP加密解密类实例分析

/*
* -工具库-加密解密码
*/
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, 0, 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, 0, 10) == 0 || substr($result, 0, 10) - TIME > 0)
{
return substr($result, 10);
}
else
{
return false;
}
}
}

$str['username'] = 'oschina';
$str['pw'] = '123456';
$str['huoxin'] = '!@#$%^&';
echo "string : " . $str . " <br />";
echo "encode : " . ($enstring = ption::en($str)) . '<br />';
echo "decode : " . ption::de($enstring);