des解密 php

php代碼解密

public function des(){
          
          	$input = '--------';//需解密內容
            $input = base64_decode($input);  //如果是base64數據需先進行解碼 再進行des解密
            $key   = '-----';   //解密密碼

            $size  = mcrypt_get_block_size('des','ecb');   
            $td    = mcrypt_module_open('des', '', 'ecb', '');
            $iv    = @mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
            @mcrypt_generic_init($td, $key, $iv);
            $data  = mdecrypt_generic($td, $input);
            mcrypt_generic_deinit($td);
            mcrypt_module_close($td);
            
            $data  = $this->pkcs5_unpad($data);
            var_dump($data);

    }

    public static  function pkcs5_unpad($text)
    {
            $pad = ord($text{strlen($text)-1});
            if ($pad > strlen($text))
            {
                return false;
            }
            if (strspn($text, chr($pad), strlen($text) - $pad) != $pad)
            {
                return false;
            }
            return substr($text, 0, -1 * $pad);
    }