Exemplo n.º 1
0
 public DHParams(UInt32 len)
 {
     length   = DHParams.GetNearest(len);
     dhParams = DHParams.GetDHParams(length);
 }
Exemplo n.º 2
0
        private void KeyExchange()
        {
            if (session == null) {
                throw new Exception("Session seems not start, Please start Session first.");
            }
            Hashtable sessionObject;
            InitKeylen();
            if (encrypt) {
                DHParams dhParams = new DHParams(keylen);
                keylen = dhParams.GetL();
                BigInteger p = dhParams.GetP();
                BigInteger g = dhParams.GetG();
                BigInteger x = dhParams.GetX();
                BigInteger y = g.ModPow(x, p);
                sessionObject = new Hashtable();
                sessionObject["x"] = x;
                sessionObject["p"] = p;
                sessionObject["keylen"] = keylen;
                session.Contents[cid] = sessionObject;
                Hashtable dhp = dhParams.GetDHParams();
                dhp["y"] = y.ToString();
                buffer.Append("phprpc_encrypt=\"");
                buffer.Append(EncodeString(Serialize(dhp)));
                buffer.Append("\";\r\n");
                if (keylen != 128) {
                    buffer.Append("phprpc_keylen=\"");
                    buffer.Append(keylen);
                    buffer.Append("\";\r\n");
                }
                SendURL();
            }
            else {
                sessionObject = (Hashtable)session.Contents[cid];
                lock (sessionObject.SyncRoot) {
                    BigInteger x = (BigInteger)sessionObject["x"];
                    BigInteger p = (BigInteger)sessionObject["p"];
                    if (keylen == 128) {
                        key = new byte[16];
                        Byte[] k = y.ModPow(x, p).GetBytes();
                        for (Int32 i = 1, n = Math.Min(k.Length, 16); i <= n; i++) {
                            this.key[16 - i] = k[n - i];
                        }

                    }
                    else {
                        key = MD5.Hash(Encoding.ASCII.GetBytes(y.ModPow(x, p).ToString()));
                    }
                    sessionObject["key"] = key;
                    sessionObject.Remove("x");
                    sessionObject.Remove("p");
                    session.Contents[cid] = sessionObject;
                }
            }
            SendCallback();
        }