我正在嘗試將創(chuàng)建加密密鑰的以下代碼轉(zhuǎn)換為 c# 結(jié)果我需要$key ** 和 ** $iv$passphrase = 'asdfghjkl';$salt =  '123456789' // for test purposes I fixed the value but it should be openssl_random_pseudo_bytes(8);        $salted = '';        $dx = '';        while (strlen($salted) < 48) {            $dx = md5($dx . $passphrase . $salt, true);            $salted .= $dx;        }        $key = substr($salted, 0, 32);        $iv = substr($salted, 32, 16);到目前為止我能做什么string passphrase = "asdfghjkl";string salt = "123456789";string key, iv;byte[] salted = new byte[0];byte[] dx = new byte[0];while (salted.Length < 48)      {        string a = passphrase + salt;        byte[] b = Encoding.UTF8.GetBytes(a);        byte[] rv = new byte[dx.Length + b.Length];        System.Buffer.BlockCopy(dx, 0, rv, 0, dx.Length);        System.Buffer.BlockCopy(b, 0, rv, dx.Length, b.Length);        //dx = MD5CryptoServiceProvider.Create().ComputeHash(rv);        using (MD5 md5 = MD5.Create())              {                dx = md5.ComputeHash(rv);              }        byte[] rx = new byte[salted.Length + dx.Length];        System.Buffer.BlockCopy(salted, 0, rx, 0, salted.Length);        System.Buffer.BlockCopy(dx, 0, rx, salted.Length, dx.Length);        salted = rx;      }string utfString1 = Encoding.UTF8.GetString(salted);key = utfString1.Substring( 0, 32);iv = utfString1.Substring(32, 16);但我沒(méi)有得到相同的結(jié)果