public void processEncryptionResponse(CPacketEncryptionResponse packetIn)
{
    Validate.validState(this.currentLoginState == NetHandlerLoginServer.LoginState.KEY, "Unexpected key packet", new Object[0]);
    PrivateKey privatekey = this.server.getKeyPair().getPrivate();

    if (!Arrays.equals(this.verifyToken, packetIn.getVerifyToken(privatekey)))
    {
        throw new IllegalStateException("Invalid nonce!");
    }
    else
    {
        this.secretKey = packetIn.getSecretKey(privatekey);
        this.currentLoginState = NetHandlerLoginServer.LoginState.AUTHENTICATING;
        this.networkManager.enableEncryption(this.secretKey);
        (new Thread("User Authenticator #" + AUTHENTICATOR_THREAD_ID.incrementAndGet())
        {
            public void run()
            {
                GameProfile gameprofile = NetHandlerLoginServer.this.loginGameProfile;

                try
                {
                    String s = (new BigInteger(CryptManager.getServerIdHash(NetHandlerLoginServer.this.serverId, NetHandlerLoginServer.this.server.getKeyPair().getPublic(), NetHandlerLoginServer.this.secretKey))).toString(16);
                    NetHandlerLoginServer.this.loginGameProfile = NetHandlerLoginServer.this.server.getMinecraftSessionService().hasJoinedServer(new GameProfile((UUID)null, gameprofile.getName()), s);

                    if (NetHandlerLoginServer.this.loginGameProfile != null)
                    {
                        NetHandlerLoginServer.logger.info("UUID of player " + NetHandlerLoginServer.this.loginGameProfile.getName() + " is " + NetHandlerLoginServer.this.loginGameProfile.getId());
                        NetHandlerLoginServer.this.currentLoginState = NetHandlerLoginServer.LoginState.READY_TO_ACCEPT;
                    }
                    else if (NetHandlerLoginServer.this.server.isSinglePlayer())
                    {
                        NetHandlerLoginServer.logger.warn("Failed to verify username but will let them in anyway!");
                        NetHandlerLoginServer.this.loginGameProfile = NetHandlerLoginServer.this.getOfflineProfile(gameprofile);
                        NetHandlerLoginServer.this.currentLoginState = NetHandlerLoginServer.LoginState.READY_TO_ACCEPT;
                    }
                    else
                    {
                        NetHandlerLoginServer.this.closeConnection("Failed to verify username!");
                        
                        // Replaced this
                        //NetHandlerLoginServer.logger.error("Username \'" + NetHandlerLoginServer.this.loginGameProfile.getName() + "\' tried to join with an invalid session");
                        NetHandlerLoginServer.logger.error("Username \'" + gameprofile.getName() + "\' tried to join with an invalid session");
                    }
                }
                catch (AuthenticationUnavailableException var3)
                {
                    if (NetHandlerLoginServer.this.server.isSinglePlayer())
                    {
                        NetHandlerLoginServer.logger.warn("Authentication servers are down but will let them in anyway!");
                        NetHandlerLoginServer.this.loginGameProfile = NetHandlerLoginServer.this.getOfflineProfile(gameprofile);
                        NetHandlerLoginServer.this.currentLoginState = NetHandlerLoginServer.LoginState.READY_TO_ACCEPT;
                    }
                    else
                    {
                        NetHandlerLoginServer.this.closeConnection("Authentication servers are down. Please try again later, sorry!");
                        NetHandlerLoginServer.logger.error("Couldn\'t verify username because servers are unavailable");
                    }
                }
            }
        }).start();
    }
}