ayuda de c# a delphi megavideo

[zastilla]

Hola

quiera implementar este codigo en un aplicacion que estoy haciendo, pero no tengo ni idea de c#
me interesa especialmente la funcion: private string decrypt(string str, string key1, string key2)
el codigo sirve para transformar la url de megavideo.
tambien lo tengo en php y en actionscript por si alguno sabe.

gracias y a ver si hay suerte:

//he quitado los using...


namespace Vispo.Programs.MegaVideoClient
{
    public partial class frmMain : Form
    {
        public frmMain()
        {
            InitializeComponent();
        }

        private void btnStart_Click(object sender, EventArgs e)
        {
            string strSub1;
            int intPos1;
            //Obtaining HTTPData
            txtHTTPData.Text = DownloadWebPage(txtMegavideoURL.Text);
            //Obtaining K1 var
            strSub1 = txtHTTPData.Text.Substring(txtHTTPData.Text.IndexOf("flashvars.k1 = ")+16);
            intPos1 = strSub1.IndexOf(";");
            txtK1.Text = strSub1.Substring(0, intPos1-1);
            //Obtaining K2 var
            strSub1 = txtHTTPData.Text.Substring(txtHTTPData.Text.IndexOf("flashvars.k2 = ") + 16);
            intPos1 = strSub1.IndexOf(";");
            txtK2.Text = strSub1.Substring(0, intPos1 - 1);
            //Obtaining S var
            strSub1 = txtHTTPData.Text.Substring(txtHTTPData.Text.IndexOf("flashvars.s = ") + 15);
            intPos1 = strSub1.IndexOf(";");
            txtS.Text = strSub1.Substring(0, intPos1 - 1);
            //Obtaining UN var
            strSub1 = txtHTTPData.Text.Substring(txtHTTPData.Text.IndexOf("flashvars.un = ") + 16);
            intPos1 = strSub1.IndexOf(";");
            txtUN.Text = strSub1.Substring(0, intPos1 - 1);
            //Obtainig FLV flash video
            txtMegavideoFLV.Text = "http://www" + txtS.Text + ".megavideo.com/files/" + decrypt(txtUN.Text, txtK1.Text, txtK2.Text) + "/";            
        }

        public static Array aRedimension(Array orgArray, Int32 tamaño)
        {
            Type t = orgArray.GetType().GetElementType();
            Array nArray = Array.CreateInstance(t, tamaño);
            Array.Copy(orgArray, 0, nArray, 0, Math.Min(orgArray.Length, tamaño));
            return nArray;
        }


        public string Concat(Array items, string delimiter)
        {
            bool first = true;

            StringBuilder sb = new StringBuilder();
            foreach (object item in items)
            {
                if (item == null)
                    continue;

                if (!first)
                {
                    sb.Append(delimiter);
                }
                else
                {
                    first = false;
                }
                sb.Append(item);
            }
            return sb.ToString();
        }

        public string[] DeConcat(string strphrase)
        {
            string[] arrTemp={};
            for (int i = 0; i < strphrase.Length; i++)
            {
                arrTemp = (string[])aRedimension(arrTemp, arrTemp.Length + 1);
                arrTemp[arrTemp.Length - 1] = strphrase[i].ToString();
            }

            return arrTemp;
        }

        private string decrypt(string str, string key1, string key2)
        {
            string [] __reg1={};
            int __reg3 = 0;
            string __reg0;
            while (__reg3 < str.Length) 
            {
               __reg0 = str[__reg3].ToString();
               if (__reg0 == "0") 
               {
                  __reg1 = (string []) aRedimension(__reg1,__reg1.Length+1);
                  __reg1[__reg1.Length-1]="0000";
               }
               else 
               {
                  if (__reg0 == "1") 
                  {
                     __reg1 = (string []) aRedimension(__reg1,__reg1.Length+1);
                     __reg1[__reg1.Length-1]="0001";
                  }
                  else 
                  {
                     if (__reg0 == "2") 
                     {
                        __reg1 = (string []) aRedimension(__reg1,__reg1.Length+1);
                        __reg1[__reg1.Length-1]="0010";
                     }
                     else 
                     {
                        if (__reg0 == "3") 
                    {
                        __reg1 = (string []) aRedimension(__reg1,__reg1.Length+1);
                        __reg1[__reg1.Length-1]="0011";
                    }
                    else 
                    {
                        if (__reg0 == "4") 
                        {
                            __reg1 = (string []) aRedimension(__reg1,__reg1.Length+1);
                            __reg1[__reg1.Length-1]="0100";
                        }
                        else 
                        {
                            if (__reg0 == "5") 
                            {
                                __reg1 = (string []) aRedimension(__reg1,__reg1.Length+1);
                                __reg1[__reg1.Length-1]="0101";
                            }
                            else 
                            {
                                if (__reg0 == "6") 
                                {
                                    __reg1 = (string []) aRedimension(__reg1,__reg1.Length+1);
                                    __reg1[__reg1.Length-1]="0110";
                                }
                                else 
                                {
                                    if (__reg0 == "7") 
                                    {
                                        __reg1 = (string []) aRedimension(__reg1,__reg1.Length+1);
                                        __reg1[__reg1.Length-1]="0111";
                                    }
                                    else 
                                    {
                                        if (__reg0 == "8") 
                                        {
                                            __reg1 = (string []) aRedimension(__reg1,__reg1.Length+1);
                                            __reg1[__reg1.Length-1]="1000";
                                        }
                                        else 
                                        {
                                            if (__reg0 == "9") 
                                            {
                                                __reg1 = (string []) aRedimension(__reg1,__reg1.Length+1);
                                                __reg1[__reg1.Length-1]="1001";
                                            }
                                            else 
                                            {
                                                if (__reg0 == "a") 
                                                {
                                                    __reg1 = (string []) aRedimension(__reg1,__reg1.Length+1);
                                                    __reg1[__reg1.Length-1]="1010";
                                                }
                                                else 
                                                {
                                                    if (__reg0 == "b") 
                                                    {
                                                        __reg1 = (string []) aRedimension(__reg1,__reg1.Length+1);
                                                        __reg1[__reg1.Length-1]="1011";
                                                    }
                                                    else 
                                                    {
                                                        if (__reg0 == "c") 
                                                        {
                                                            __reg1 = (string []) aRedimension(__reg1,__reg1.Length+1);
                                                            __reg1[__reg1.Length-1]="1100";
                                                        }
                                                        else 
                                                        {
                                                            if (__reg0 == "d") 
                                                            {
                                                                __reg1 = (string []) aRedimension(__reg1,__reg1.Length+1);
                                                                __reg1[__reg1.Length-1]="1101";
                                                            }
                                                            else 
                                                            {
                                                                if (__reg0 == "e") 
                                                                {
                                                                    __reg1 = (string []) aRedimension(__reg1,__reg1.Length+1);
                                                                    __reg1[__reg1.Length-1]="1110";
                                                                }
                                                                else 
                                                                {
                                                                    if (__reg0 == "f") 
                                                                    {
                                                                        __reg1 = (string []) aRedimension(__reg1,__reg1.Length+1);
                                                                        __reg1[__reg1.Length-1]="1111";
                                                                    }
                                                                }
                                                            }
                                                        }
                                                    }
                                                }
                                            }
                                        }
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
        ++__reg3;
    }
    string strTemp1 = Concat(__reg1, "");
    __reg1 = DeConcat(strTemp1);

    int[] __reg6;
    __reg6 = new int[384];
    __reg3 = 0;
    while (__reg3 < 384) 
    {
        key1 = ((int.Parse(key1) * 11 + 77213) % 81371).ToString();
        key2 = ((int.Parse(key2) * 17 + 92717) % 192811).ToString();
        __reg6[__reg3] = (int.Parse(key1) + int.Parse(key2)) % 128;
        ++__reg3;
    }

    __reg3 = 256;
    int __reg5, __reg4, __reg8;
    while (__reg3 >= 0) 
    {
        __reg5 = __reg6[__reg3];
        __reg4 = __reg3 % 128;
        __reg8 = int.Parse(__reg1[__reg5]);
        __reg1[__reg5] = __reg1[__reg4];
        __reg1[__reg4] = __reg8.ToString();
        --__reg3;
    }

    __reg3 = 0;
    while (__reg3 < 128) 
    {
        __reg1[__reg3] = (int.Parse(__reg1[__reg3]) ^ (__reg6[__reg3 + 256] & 1)).ToString() ;
        ++__reg3;
    }

    string __reg12; 
    __reg12 = Concat(__reg1,"");

    string[] __reg7={};
    __reg3 = 0;
    int intTmp1 = 0;
    while (__reg3 < __reg12.Length) 
    {
        string __reg9;
        //if (intTmp1 < 4) __reg9 = __reg12.Substring(__reg3, 4 - intTmp1);
        //else __reg9 = "";
        __reg9 = __reg12.Substring(__reg3, 4);
        __reg7 = (string[])aRedimension(__reg7, __reg7.Length + 1);
        __reg7[__reg7.Length - 1] = __reg9;
        __reg3 = __reg3 + 4;
        intTmp1++;
    }
    
    string[] __reg2 = {};
    __reg3 = 0;
    while (__reg3 < __reg7.Length) 
    {
        __reg0=__reg7[__reg3];
        if (__reg0 == "0000") 
        {
            __reg2 = (string[])aRedimension(__reg2, __reg2.Length + 1);
            __reg2[__reg2.Length - 1] = "0";
        }
        else 
        {
            if (__reg0 == "0001") 
            {
                __reg2 = (string[])aRedimension(__reg2, __reg2.Length + 1);
                __reg2[__reg2.Length - 1] = "1";
            }
            else 
            {
                if (__reg0 == "0010") 
                {
                    __reg2 = (string[])aRedimension(__reg2, __reg2.Length + 1);
                    __reg2[__reg2.Length - 1] = "2";
                }
                else 
                {
                    if (__reg0 == "0011") 
                    {
                        __reg2 = (string[])aRedimension(__reg2, __reg2.Length + 1);
                        __reg2[__reg2.Length - 1] = "3";
                    }
                    else 
                    {
                        if (__reg0 == "0100") 
                        {
                            __reg2 = (string[])aRedimension(__reg2, __reg2.Length + 1);
                            __reg2[__reg2.Length - 1] = "4";
                        }
                        else 
                        {
                            if (__reg0 == "0101") 
                            {
                                __reg2 = (string[])aRedimension(__reg2, __reg2.Length + 1);
                                __reg2[__reg2.Length - 1] = "5";
                            }
                            else 
                            {
                                if (__reg0 == "0110") 
                                {
                                    __reg2 = (string[])aRedimension(__reg2, __reg2.Length + 1);
                                    __reg2[__reg2.Length - 1] = "6";
                                }
                                else 
                                {
                                    if (__reg0 == "0111") 
                                    {
                                        __reg2 = (string[])aRedimension(__reg2, __reg2.Length + 1);
                                        __reg2[__reg2.Length - 1] = "7";
                                    }
                                    else 
                                    {
                                        if (__reg0 == "1000") 
                                        {
                                            __reg2 = (string[])aRedimension(__reg2, __reg2.Length + 1);
                                            __reg2[__reg2.Length - 1] = "8";
                                        }
                                        else 
                                        {
                                            if (__reg0 == "1001") 
                                            {
                                                __reg2 = (string[])aRedimension(__reg2, __reg2.Length + 1);
                                                __reg2[__reg2.Length - 1] = "9";
                                            }
                                            else 
                                            {
                                                if (__reg0 == "1010") 
                                                {
                                                    __reg2 = (string[])aRedimension(__reg2, __reg2.Length + 1);
                                                    __reg2[__reg2.Length - 1] = "a";
                                                }
                                                else 
                                                {
                                                    if (__reg0 == "1011") 
                                                    {
                                                        __reg2 = (string[])aRedimension(__reg2, __reg2.Length + 1);
                                                        __reg2[__reg2.Length - 1] = "b";
                                                    }
                                                    else 
                                                    {
                                                        if (__reg0 == "1100") 
                                                        {
                                                            __reg2 = (string[])aRedimension(__reg2, __reg2.Length + 1);
                                                            __reg2[__reg2.Length - 1] = "c";
                                                        }
                                                        else 
                                                        {
                                                            if (__reg0 == "1101") 
                                                            {
                                                                __reg2 = (string[])aRedimension(__reg2, __reg2.Length + 1);
                                                                __reg2[__reg2.Length - 1] = "d";
                                                            }
                                                            else 
                                                            {
                                                                if (__reg0 == "1110") 
                                                                {
                                                                    __reg2 = (string[])aRedimension(__reg2, __reg2.Length + 1);
                                                                    __reg2[__reg2.Length - 1] = "e";
                                                                }
                                                                else 
                                                                {
                                                                    if (__reg0 == "1111") 
                                                                    {
                                                                        __reg2 = (string[])aRedimension(__reg2, __reg2.Length + 1);
                                                                        __reg2[__reg2.Length - 1] = "f";
                                                                    }
                                                                }
                                                            }
                                                        }
                                                    }
                                                }
                                            }
                                        }
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
        ++__reg3;
    }
    return Concat(__reg2, "");
        }



        public string DownloadWebPage(string Url)
        {
          
            HttpWebRequest WebRequestObject = (HttpWebRequest)HttpWebRequest.Create(Url);

           
            WebRequestObject.UserAgent = ".NET Framework/2.0";
            WebRequestObject.Referer = "http://www.megavideo.com/";

            
            WebResponse Response = WebRequestObject.GetResponse();

            
            Stream WebStream = Response.GetResponseStream();

            
            StreamReader Reader = new StreamReader(WebStream);

            
            string PageContent = Reader.ReadToEnd();

            
            Reader.Close();
            WebStream.Close();
            Response.Close();

            return PageContent;
        }

        


    }
}