Esempio n. 1
0
        private BlindSocket ECDH_Server(Socket socket)
        {
            if (socket == null)
            {
                return(null);
            }

            Cryptography.AES256 aes;
            BlindSocket         clientSock;

            using (ECDiffieHellmanCng dh = new ECDiffieHellmanCng())
            {
                dh.KeyDerivationFunction = ECDiffieHellmanKeyDerivationFunction.Hash;
                dh.HashAlgorithm         = CngAlgorithm.Sha256;
                byte[] publicKey = dh.PublicKey.ToByteArray();
                socket.Send(publicKey, publicKey.Length, SocketFlags.None);
                byte[] sharekey = new byte[publicKey.Length];
                socket.Receive(sharekey, publicKey.Length, SocketFlags.None);
                byte[] key = dh.DeriveKeyMaterial(CngKey.Import(sharekey, CngKeyBlobFormat.EccPublicBlob));
                aes        = new Cryptography.AES256(key);
                clientSock = new BlindSocket(socket, aes);
            }

            for (int i = 1; ; i++)
            {
                byte[] prevIv = aes.aes.IV;
                aes.aes.GenerateIV();
                byte[] newIv = aes.aes.IV;
                aes.aes.IV = prevIv;

                clientSock.CryptoSend(newIv, PacketType.Info);
                byte[] iv = clientSock.CryptoReceiveMsg();

                if (!newIv.SequenceEqual(iv))
                {
                    if (i < BlindNetConst.MAXRETRY)
                    {
                        clientSock.CryptoSend(null, PacketType.Retry);
                    }
                    else
                    {
                        clientSock.CryptoSend(null, PacketType.Fail);
                        return(null);
                    }
                }
                else
                {
                    clientSock.CryptoSend(null, PacketType.OK);
                    aes.aes.IV = newIv;
                    break;
                }
            }
            return(clientSock);
        }
Esempio n. 2
0
        private BlindSocket ECDH_Server(Socket socket)
        {
            if (socket == null)
            {
                return(null);
            }

            Cryptography.AES256 aes;
            BlindSocket         clientSock;

            using (ECDiffieHellmanCng dh = new ECDiffieHellmanCng())
            {
                dh.KeyDerivationFunction = ECDiffieHellmanKeyDerivationFunction.Hash;
                dh.HashAlgorithm         = CngAlgorithm.Sha256;
                byte[] publicKey = dh.PublicKey.ToByteArray();
                socket.Send(publicKey, publicKey.Length, SocketFlags.None);
                byte[] sharekey = new byte[publicKey.Length];
                socket.Receive(sharekey, publicKey.Length, SocketFlags.None);
                byte[] key = dh.DeriveKeyMaterial(CngKey.Import(sharekey, CngKeyBlobFormat.EccPublicBlob));
                aes        = new Cryptography.AES256(key);
                clientSock = new BlindSocket(socket, aes);
            }

            for (int i = 1; ; i++)
            {
                string testTxt = BlindNetUtil.GetRandomString(BlindNetConst.MINRNDTXT, BlindNetConst.MAXRNDTXT);
                clientSock.CryptoSend(Encoding.UTF8.GetBytes(testTxt), PacketType.MSG);
                var    pack    = clientSock.CryptoReceive();
                string recvTxt = Encoding.UTF8.GetString(pack.data).TrimEnd('\0');
                if (recvTxt != testTxt)
                {
                    if (i < BlindNetConst.MAXRETRY)
                    {
                        clientSock.CryptoSend(null, PacketType.Retry);
                    }
                    else
                    {
                        clientSock.CryptoSend(null, PacketType.Fail);
                        return(null);
                    }
                }
                else
                {
                    break;
                }
            }
            clientSock.CryptoSend(null, PacketType.OK);
            return(clientSock);
        }
Esempio n. 3
0
 public BlindSocket(ref BlindSocket blindSocket)
 {
     socket = blindSocket.socket;
     aes    = blindSocket.aes;
 }