phpseclib 零字节填充

Question

如何在EBC模式3des加密方式的phpseclib中添加零字节填充？

这是我当前的代码：

$cipher = new TripleDES(TripleDES::MODE_ECB);
$cipher->setKey('1234567890ABCDEFGHIJKLMN');

Answer 1

想明白了：

1. 禁用填充：

   $cipher->disablePadding();
   

2. 手动填充消息：

   $message_padded = $urlencoded;
   if (strlen($message_padded) % 8) {
       $message_padded = str_pad($message_padded,
           strlen($message_padded) + 8 - strlen($message_padded) % 8, "[=11=]");
   }
   

3. 加密：

   $result = $cipher -> encrypt($message_padded);