Add support for secure pairing and input encryption to fix GFE 2.1 compatibility.

TODO:
Needs a LimelightCryptoProvider implementation for each platform to work.
Untested (and probably broken) on Android.
Needs more testing in general, especially in corner cases.

moonlight-common/.classpath

@@ -4,5 +4,6 @@
 	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
 	<classpathentry kind="lib" path="libs/xpp3-1.1.4c.jar"/>
 	<classpathentry kind="lib" path="libs/tinyrtsp.jar"/>
+	<classpathentry kind="lib" path="libs/commons-codec-1.9.jar"/>
 	<classpathentry kind="output" path="bin"/>
 </classpath>

moonlight-common/src/com/limelight/nvstream/NvConnection.java

@@ -5,11 +5,15 @@ import java.net.InetAddress;
 import java.net.NetworkInterface;
 import java.net.SocketException;
 import java.net.UnknownHostException;
+import java.security.NoSuchAlgorithmException;
 import java.util.Enumeration;
 import java.util.concurrent.LinkedBlockingQueue;
 import java.util.concurrent.ThreadPoolExecutor;
 import java.util.concurrent.TimeUnit;
 
+import javax.crypto.KeyGenerator;
+import javax.crypto.SecretKey;
+
 import org.xmlpull.v1.XmlPullParserException;
 
 import com.limelight.LimeLog;
@@ -19,8 +23,10 @@ import com.limelight.nvstream.av.video.VideoDecoderRenderer;
 import com.limelight.nvstream.av.video.VideoStream;
 import com.limelight.nvstream.control.ControlStream;
 import com.limelight.nvstream.http.GfeHttpResponseException;
+import com.limelight.nvstream.http.LimelightCryptoProvider;
 import com.limelight.nvstream.http.NvApp;
 import com.limelight.nvstream.http.NvHTTP;
+import com.limelight.nvstream.http.PairingManager;
 import com.limelight.nvstream.input.NvController;
 import com.limelight.nvstream.rtsp.RtspConnection;
 
@@ -28,6 +34,7 @@ public class NvConnection {
 	private String host;
 	private NvConnectionListener listener;
 	private StreamConfiguration config;
+	private LimelightCryptoProvider cryptoProvider;
 	
 	private InetAddress hostAddr;
 	private ControlStream controlStream;
@@ -41,19 +48,38 @@ public class NvConnection {
 	private VideoDecoderRenderer videoDecoderRenderer;
 	private AudioRenderer audioRenderer;
 	private String localDeviceName;
+	private SecretKey riKey;
 	
 	private ThreadPoolExecutor threadPool;
 	
-	public NvConnection(String host, NvConnectionListener listener, StreamConfiguration config)
+	public NvConnection(String host, NvConnectionListener listener, StreamConfiguration config, LimelightCryptoProvider cryptoProvider)
 	{
 		this.host = host;
 		this.listener = listener;
 		this.config = config;
+		this.cryptoProvider = cryptoProvider;
+		
+		try {
+			// This is unique per connection
+			this.riKey = generateRiAesKey();
+		} catch (NoSuchAlgorithmException e) {
+			// Should never happen
+			e.printStackTrace();
+		}
 		
 		this.threadPool = new ThreadPoolExecutor(1, 1, Long.MAX_VALUE, TimeUnit.DAYS,
 				new LinkedBlockingQueue<Runnable>(), new ThreadPoolExecutor.DiscardPolicy());
 	}
 	
+	private static SecretKey generateRiAesKey() throws NoSuchAlgorithmException {
+		KeyGenerator keyGen = KeyGenerator.getInstance("AES");
+		
+		// RI keys are 128 bits
+		keyGen.init(128);
+		
+		return keyGen.generateKey();
+	}
+	
 	public static String getMacAddressString() throws SocketException {
 		Enumeration<NetworkInterface> ifaceList;
 		NetworkInterface selectedIface = null;
@@ -136,24 +162,18 @@ public class NvConnection {
 	
 	private boolean startSteamBigPicture() throws XmlPullParserException, IOException
 	{
-		NvHTTP h = new NvHTTP(hostAddr, getMacAddressString(), localDeviceName);
+		NvHTTP h = new NvHTTP(hostAddr, getMacAddressString(), localDeviceName, cryptoProvider);
 		
-		if (h.getAppVersion().startsWith("1.")) {
+		if (h.getServerVersion().startsWith("1.")) {
 			listener.displayMessage("Limelight now requires GeForce Experience 2.0.1 or later. Please upgrade GFE on your PC and try again.");
 			return false;
 		}
 		
-		if (!h.getPairState()) {
+		if (h.getPairState() != PairingManager.PairState.PAIRED) {
 			listener.displayMessage("Device not paired with computer");
 			return false;
 		}
 		
-		int sessionId = h.getSessionId();
-		if (sessionId == 0) {
-			listener.displayMessage("Invalid session ID");
-			return false;
-		}
-		
 		NvApp app = h.getSteamApp();
 		if (app == null) {
 			listener.displayMessage("Steam not found in GFE app list");
@@ -163,7 +183,7 @@ public class NvConnection {
 		// If there's a game running, resume it
 		if (h.getCurrentGame() != 0) {
 			try {
-				if (!h.resumeApp()) {
+				if (!h.resumeApp(riKey)) {
 					listener.displayMessage("Failed to resume existing session");
 					return false;
 				}
@@ -185,7 +205,7 @@ public class NvConnection {
 		else {
 			// Launch the app since it's not running
 			int gameSessionId = h.launchApp(app.getAppId(), config.getWidth(),
-					config.getHeight(), config.getRefreshRate());
+					config.getHeight(), config.getRefreshRate(), riKey);
 			if (gameSessionId == 0) {
 				listener.displayMessage("Failed to launch application");
 				return false;
@@ -231,7 +251,7 @@ public class NvConnection {
 		// it to the instance variable once the object is properly initialized.
 		// This avoids the race where inputStream != null but inputStream.initialize()
 		// has not returned yet.
-		NvController tempController = new NvController(hostAddr);
+		NvController tempController = new NvController(hostAddr, riKey);
 		tempController.initialize();
 		inputStream = tempController;
 		return true;

moonlight-common/src/com/limelight/nvstream/http/LimelightCryptoProvider.java

@@ -0,0 +1,9 @@
+package com.limelight.nvstream.http;
+
+import java.security.cert.X509Certificate;
+import java.security.interfaces.RSAPrivateKey;
+
+public interface LimelightCryptoProvider {
+	public X509Certificate getClientCertificate();
+	public RSAPrivateKey getClientPrivateKey();
+}

moonlight-common/src/com/limelight/nvstream/http/NvHTTP.java

@@ -3,13 +3,20 @@ package com.limelight.nvstream.http;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
+import java.io.Reader;
+import java.io.StringReader;
 import java.net.Inet6Address;
 import java.net.InetAddress;
+import java.net.MalformedURLException;
 import java.net.URL;
 import java.net.URLConnection;
 import java.util.LinkedList;
+import java.util.Scanner;
 import java.util.Stack;
 
+import javax.crypto.SecretKey;
+
+import org.apache.commons.codec.binary.Base64;
 import org.xmlpull.v1.XmlPullParser;
 import org.xmlpull.v1.XmlPullParserException;
 import org.xmlpull.v1.XmlPullParserFactory;
@@ -17,13 +24,14 @@ import org.xmlpull.v1.XmlPullParserFactory;
 
 public class NvHTTP {
 	private String uniqueId;
+	private PairingManager pm;
 
-	public static final int PORT = 47989;
+	public static final int PORT = 47984;
 	public static final int CONNECTION_TIMEOUT = 5000;
 
 	public String baseUrl;
 	
-	public NvHTTP(InetAddress host, String uniqueId, String deviceName) {
+	public NvHTTP(InetAddress host, String uniqueId, String deviceName, LimelightCryptoProvider cryptoProvider) {
 		this.uniqueId = uniqueId;
 		
 		String safeAddress;
@@ -35,16 +43,16 @@ public class NvHTTP {
 			safeAddress = host.getHostAddress();
 		}
 		
-		this.baseUrl = "http://" + safeAddress + ":" + PORT;
+		this.baseUrl = "https://" + safeAddress + ":" + PORT;
+		this.pm = new PairingManager(this, cryptoProvider);
 	}
 	
-	private String getXmlString(InputStream in, String tagname)
+	static String getXmlString(Reader r, String tagname) throws XmlPullParserException, IOException {
-			throws XmlPullParserException, IOException {
 		XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
 		factory.setNamespaceAware(true);
 		XmlPullParser xpp = factory.newPullParser();
 
-		xpp.setInput(new InputStreamReader(in));
+		xpp.setInput(r);
 		int eventType = xpp.getEventType();
 		Stack<String> currentTag = new Stack<String>();
 		
@@ -71,7 +79,15 @@ public class NvHTTP {
 		return null;
 	}
 
-	private void verifyResponseStatus(XmlPullParser xpp) throws GfeHttpResponseException {
+	static String getXmlString(String str, String tagname) throws XmlPullParserException, IOException {
+		return getXmlString(new StringReader(str), tagname);
+	}
+	
+	static String getXmlString(InputStream in, String tagname) throws XmlPullParserException, IOException {
+		return getXmlString(new InputStreamReader(in), tagname);
+	}
+	
+	private static void verifyResponseStatus(XmlPullParser xpp) throws GfeHttpResponseException {
 		int statusCode = Integer.parseInt(xpp.getAttributeValue(XmlPullParser.NO_NAMESPACE, "status_code"));
 		if (statusCode != 200) {
 			throw new GfeHttpResponseException(statusCode, xpp.getAttributeValue(XmlPullParser.NO_NAMESPACE, "status_message"));
@@ -80,31 +96,37 @@ public class NvHTTP {
 
 	private InputStream openHttpConnection(String url) throws IOException {
 		URLConnection conn = new URL(url).openConnection();
+		System.out.println(conn.getURL());
 		conn.setConnectTimeout(CONNECTION_TIMEOUT);
-		conn.setDefaultUseCaches(false);
+		conn.setUseCaches(false);
 		conn.connect();
 		return conn.getInputStream();
 	}
 	
-	public String getAppVersion() throws XmlPullParserException, IOException {
+	String openHttpConnectionToString(String url) throws MalformedURLException, IOException {
-		InputStream in = openHttpConnection(baseUrl + "/appversion");
+		Scanner s = new Scanner(openHttpConnection(url));
+		
+		String str = "";
+		while (s.hasNext()) {
+			str += s.next() + " ";
+		}
+		
+		s.close();
+		System.out.println(str);
+		return str;
+	}
+
+	public String getServerVersion() throws XmlPullParserException, IOException {
+		InputStream in = openHttpConnection(baseUrl + "/serverinfo?uniqueid=" + uniqueId);
 		return getXmlString(in, "appversion");
 	}
 
-	public boolean getPairState() throws IOException, XmlPullParserException {
+	public PairingManager.PairState getPairState() throws IOException, XmlPullParserException {
-		InputStream in = openHttpConnection(baseUrl + "/pairstate?uniqueid=" + uniqueId);
+		return pm.getPairState(uniqueId);
-		String paired = getXmlString(in, "paired");
-		return Integer.valueOf(paired) != 0;
-	}
-
-	public int getSessionId() throws IOException, XmlPullParserException {
-		InputStream in = openHttpConnection(baseUrl + "/pair?uniqueid=" + uniqueId);
-		String sessionId = getXmlString(in, "sessionid");
-		return Integer.parseInt(sessionId);
 	}
 
 	public int getCurrentGame() throws IOException, XmlPullParserException {
-		InputStream in = openHttpConnection(baseUrl + "/serverinfo");
+		InputStream in = openHttpConnection(baseUrl + "/serverinfo?uniqueid=" + uniqueId);
 		String game = getXmlString(in, "currentgame");
 		return Integer.parseInt(game);
 	}
@@ -120,6 +142,10 @@ public class NvHTTP {
 		return null;
 	}
 	
+	public PairingManager.PairState pair(String pin) throws Exception {
+		return pm.pair(uniqueId, pin);
+	}
+	
 	public LinkedList<NvApp> getAppList() throws GfeHttpResponseException, IOException, XmlPullParserException {
 		InputStream in = openHttpConnection(baseUrl + "/applist?uniqueid=" + uniqueId);
 		XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
@@ -161,18 +187,19 @@ public class NvHTTP {
 		return appList;
 	}
 
-	// Returns gameSession XML attribute
+	public int launchApp(int appId, int width, int height, int refreshRate, SecretKey inputKey) throws IOException, XmlPullParserException {
-	public int launchApp(int appId, int width, int height, int refreshRate) throws IOException, XmlPullParserException {
 		InputStream in = openHttpConnection(baseUrl +
 			"/launch?uniqueid=" + uniqueId +
 			"&appid=" + appId +
-			"&mode=" + width + "x" + height + "x" + refreshRate);
+			"&mode=" + width + "x" + height + "x" + refreshRate +
+			"&additionalStates=1&sops=1&rikey="+Base64.encodeBase64String(inputKey.getEncoded()));
 		String gameSession = getXmlString(in, "gamesession");
 		return Integer.parseInt(gameSession);
 	}
 	
-	public boolean resumeApp() throws IOException, XmlPullParserException {
+	public boolean resumeApp(SecretKey inputKey) throws IOException, XmlPullParserException {
-		InputStream in = openHttpConnection(baseUrl + "/resume?uniqueid=" + uniqueId);
+		InputStream in = openHttpConnection(baseUrl + "/resume?uniqueid=" + uniqueId +
+				"&rikey="+Base64.encodeBase64String(inputKey.getEncoded()));
 		String resume = getXmlString(in, "resume");
 		return Integer.parseInt(resume) != 0;
 	}

moonlight-common/src/com/limelight/nvstream/http/PairingManager.java

@@ -0,0 +1,325 @@
+package com.limelight.nvstream.http;
+
+import javax.crypto.BadPaddingException;
+import javax.crypto.Cipher;
+import javax.crypto.IllegalBlockSizeException;
+import javax.crypto.NoSuchPaddingException;
+import javax.crypto.SecretKey;
+import javax.crypto.ShortBufferException;
+import javax.crypto.spec.SecretKeySpec;
+import javax.net.ssl.*;
+
+import org.xmlpull.v1.XmlPullParserException;
+
+import java.security.cert.Certificate;
+import java.security.cert.CertificateException;
+import java.io.*;
+import java.net.MalformedURLException;
+import java.net.Socket;
+import java.security.*;
+import java.security.cert.*;
+import java.util.Arrays;
+
+public class PairingManager {
+
+	private NvHTTP http;
+	
+	private PrivateKey pk;
+	private X509Certificate cert;
+	private SecretKey aesKey;
+	
+	byte[] privKeyBytes;
+	byte[] pubKeyBytes;
+	
+	public enum PairState {
+		NOT_PAIRED,
+		PAIRED,
+		PIN_WRONG,
+		FAILED
+	}
+	
+	public PairingManager(NvHTTP http, LimelightCryptoProvider cryptoProvider) {
+		this.http = http;
+		this.cert = cryptoProvider.getClientCertificate();
+		this.pk = cryptoProvider.getClientPrivateKey();
+		
+		// Update the trust manager and key manager to use our certificate and PK
+	    installSslKeysAndTrust();
+	}
+	
+	public void installSslKeysAndTrust() {
+		// Create a trust manager that does not validate certificate chains
+		TrustManager[] trustAllCerts = new TrustManager[] { 
+				new X509TrustManager() {
+					public X509Certificate[] getAcceptedIssuers() { 
+						return new X509Certificate[0]; 
+					}
+					public void checkClientTrusted(X509Certificate[] certs, String authType) {}
+					public void checkServerTrusted(X509Certificate[] certs, String authType) {}
+				}};
+
+		KeyManager[] ourKeyman = new KeyManager[] {
+				new X509KeyManager() {
+					public String chooseClientAlias(String[] keyTypes,
+							Principal[] issuers, Socket socket) {
+						return "Limelight-RSA";
+					}
+
+					public String chooseServerAlias(String keyType, Principal[] issuers,
+							Socket socket) {
+						return null;
+					}
+
+					public X509Certificate[] getCertificateChain(String alias) {
+						return new X509Certificate[] {cert};
+					}
+
+					public String[] getClientAliases(String keyType, Principal[] issuers) {
+						return null;
+					}
+
+					public PrivateKey getPrivateKey(String alias) {
+						return pk;
+					}
+
+					public String[] getServerAliases(String keyType, Principal[] issuers) {
+						return null;
+					}
+				}
+		};
+
+		// Ignore differences between given hostname and certificate hostname
+		HostnameVerifier hv = new HostnameVerifier() {
+			public boolean verify(String hostname, SSLSession session) { return true; }
+		};
+
+		// Install the all-trusting trust manager
+		try {
+			SSLContext sc = SSLContext.getInstance("SSL");
+			sc.init(ourKeyman, trustAllCerts, new SecureRandom());
+			HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());
+			HttpsURLConnection.setDefaultHostnameVerifier(hv);
+		} catch (Exception e) {}
+	}
+	
+	final private static char[] hexArray = "0123456789ABCDEF".toCharArray();
+	private static String bytesToHex(byte[] bytes) {
+	    char[] hexChars = new char[bytes.length * 2];
+	    for ( int j = 0; j < bytes.length; j++ ) {
+	        int v = bytes[j] & 0xFF;
+	        hexChars[j * 2] = hexArray[v >>> 4];
+	        hexChars[j * 2 + 1] = hexArray[v & 0x0F];
+	    }
+	    return new String(hexChars);
+	}
+	
+	private static byte[] hexToBytes(String s) {
+	    int len = s.length();
+	    byte[] data = new byte[len / 2];
+	    for (int i = 0; i < len; i += 2) {
+	        data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4)
+	                             + Character.digit(s.charAt(i+1), 16));
+	    }
+	    return data;
+	}
+	
+	private X509Certificate extractPlainCert(String text) throws XmlPullParserException, IOException, CertificateException
+	{
+		String certText = NvHTTP.getXmlString(text, "plaincert");
+		byte[] certBytes = hexToBytes(certText);
+		CertificateFactory cf = CertificateFactory.getInstance("X.509");
+	    return (X509Certificate)cf.generateCertificate(new ByteArrayInputStream(certBytes));
+	}
+	
+	private byte[] generateRandomBytes(int length)
+	{
+		byte[] rand = new byte[length];
+		new SecureRandom().nextBytes(rand);
+		return rand;
+	}
+	
+	private static byte[] saltPin(byte[] salt, String pin) throws UnsupportedEncodingException {
+		byte[] saltedPin = new byte[salt.length + pin.length()];
+		System.arraycopy(salt, 0, saltedPin, 0, salt.length);
+		System.arraycopy(pin.getBytes("UTF-8"), 0, saltedPin, salt.length, pin.length());
+		return saltedPin;
+	}
+	
+	private static byte[] toSHA1Bytes(byte[] convertme) {
+	    MessageDigest md = null;
+	    try {
+	        md = MessageDigest.getInstance("SHA-1");
+	    }
+	    catch(NoSuchAlgorithmException e) {
+	        e.printStackTrace();
+	    } 
+	    return md.digest(convertme);
+	}
+	
+	private static boolean verifySignature(byte[] data, byte[] signature, Certificate cert) throws NoSuchAlgorithmException, SignatureException, InvalidKeyException {
+		Signature sig = Signature.getInstance("SHA256withRSA");
+		sig.initVerify(cert.getPublicKey());
+		sig.update(data);
+		return sig.verify(signature);
+	}
+	
+	private static byte[] signData(byte[] data, PrivateKey key) throws NoSuchAlgorithmException, SignatureException, InvalidKeyException {
+		Signature sig = Signature.getInstance("SHA256withRSA");
+		sig.initSign(key);
+		sig.update(data);
+		byte[] signature = new byte[256];
+		sig.sign(signature, 0, signature.length);
+		return signature;
+	}
+	
+	private static byte[] decryptAes(byte[] encryptedData, SecretKey secretKey) throws NoSuchAlgorithmException, SignatureException,
+	InvalidKeyException, ShortBufferException, IllegalBlockSizeException, BadPaddingException, NoSuchPaddingException {
+		Cipher cipher = Cipher.getInstance("AES/ECB/NoPadding");
+		
+		int blockRoundedSize = ((encryptedData.length + 15) / 16) * 16;
+		byte[] blockRoundedEncrypted = Arrays.copyOf(encryptedData, blockRoundedSize);
+		byte[] fullDecrypted = new byte[blockRoundedSize];
+
+		cipher.init(Cipher.DECRYPT_MODE, secretKey);
+		cipher.doFinal(blockRoundedEncrypted, 0,
+				blockRoundedSize, fullDecrypted);
+		return fullDecrypted;
+	}
+	
+	private static byte[] encryptAes(byte[] data, SecretKey secretKey) throws NoSuchAlgorithmException, SignatureException,
+	InvalidKeyException, ShortBufferException, IllegalBlockSizeException, BadPaddingException, NoSuchPaddingException {
+		Cipher cipher = Cipher.getInstance("AES/ECB/NoPadding");
+		
+		int blockRoundedSize = ((data.length + 15) / 16) * 16;
+		byte[] blockRoundedData = Arrays.copyOf(data, blockRoundedSize);
+		
+		cipher.init(Cipher.ENCRYPT_MODE, secretKey);
+		return cipher.doFinal(blockRoundedData);
+	}
+	
+	private static SecretKey generateAesKey(byte[] keyData) {
+		byte[] aesTruncated = Arrays.copyOf(toSHA1Bytes(keyData), 16);
+		System.out.println("AES key data: "+bytesToHex(aesTruncated));
+		return new SecretKeySpec(aesTruncated, "AES");
+	}
+	
+	private static byte[] concatBytes(byte[] a, byte[] b) {
+		byte[] c = new byte[a.length + b.length];
+		System.arraycopy(a, 0, c, 0, a.length);
+		System.arraycopy(b, 0, c, a.length, b.length);
+		return c;
+	}
+	
+	public PairState getPairState(String uniqueId) throws MalformedURLException, IOException, XmlPullParserException  {
+		String serverInfo = http.openHttpConnectionToString(http.baseUrl + "/serverinfo?uniqueid="+uniqueId);
+		if (!NvHTTP.getXmlString(serverInfo, "PairStatus").equals("1")) {
+			return PairState.NOT_PAIRED;
+		}
+		
+		String pairChallenge = http.openHttpConnectionToString(http.baseUrl + "/pair?uniqueid="+uniqueId+"&devicename=roth&updateState=1&phrase=pairchallenge");
+		if (NvHTTP.getXmlString(pairChallenge, "paired").equals("1")) {
+			return PairState.PAIRED;
+		}
+		else {
+			return PairState.NOT_PAIRED;
+		}
+	}
+	
+	public PairState pair(String uniqueId, String pin) throws MalformedURLException, IOException, XmlPullParserException, CertificateException, InvalidKeyException, NoSuchAlgorithmException, SignatureException, ShortBufferException, IllegalBlockSizeException, BadPaddingException, NoSuchPaddingException {
+		// Generate a salt for hashing the PIN
+		byte[] salt = generateRandomBytes(16);
+		System.out.println("Using salt: "+bytesToHex(salt));
+
+		// Combine the salt and pin, then create an AES key from them
+		byte[] saltAndPin = saltPin(salt, pin);
+		aesKey = generateAesKey(saltAndPin);
+		
+		// Send the salt and get the server cert
+		String getCert = http.openHttpConnectionToString(http.baseUrl +
+				"/pair?uniqueid="+uniqueId+"&devicename=roth&updateState=1&phrase=getservercert&salt="+bytesToHex(salt)+"&clientcert="+bytesToHex(pubKeyBytes));
+		if (!NvHTTP.getXmlString(getCert, "paired").equals("1")) {
+			return PairState.FAILED;
+		}
+		X509Certificate serverCert = extractPlainCert(getCert);
+		System.out.println(serverCert);
+		
+		// Generate a random challenge and encrypt it with our AES key
+		byte[] randomChallenge = generateRandomBytes(16);
+		System.out.println("Unencrypted challenge: "+bytesToHex(randomChallenge));
+		byte[] encryptedChallenge = encryptAes(randomChallenge, aesKey);
+		System.out.println("Encrypted challenge: "+bytesToHex(encryptedChallenge));
+		
+		// Send the encrypted challenge to the server
+		String challengeResp = http.openHttpConnectionToString(http.baseUrl + 
+				"/pair?uniqueid="+uniqueId+"&devicename=roth&updateState=1&clientchallenge="+bytesToHex(encryptedChallenge));
+		if (!NvHTTP.getXmlString(challengeResp, "paired").equals("1")) {
+			return PairState.FAILED;
+		}
+		
+		// Decode the server's response and subsequent challenge
+		byte[] encServerChallengeResponse = hexToBytes(NvHTTP.getXmlString(challengeResp, "challengeresponse"));
+		System.out.println("Encrypted challenge response: "+bytesToHex(encServerChallengeResponse));
+		byte[] decServerChallengeResponse = decryptAes(encServerChallengeResponse, aesKey);
+		System.out.println("Decrypted challenge response: "+bytesToHex(decServerChallengeResponse));
+		
+		byte[] serverResponse = Arrays.copyOfRange(decServerChallengeResponse, 0, 20);
+		byte[] serverChallenge = Arrays.copyOfRange(decServerChallengeResponse, 20, 36);
+		System.out.println("Server response: "+bytesToHex(serverResponse));
+		System.out.println("Server challenge: "+bytesToHex(serverChallenge));
+		
+		// Using another 16 bytes secret, compute a challenge response hash using the secret, our cert sig, and the challenge
+		byte[] clientSecret = generateRandomBytes(16);
+		byte[] challengeRespHash = toSHA1Bytes(concatBytes(concatBytes(serverChallenge, cert.getSignature()), clientSecret));
+		System.out.println("Client challenge response hash: "+bytesToHex(challengeRespHash));
+		byte[] challengeRespEncrypted = encryptAes(challengeRespHash, aesKey);
+		System.out.println("Client challenge response encrypted: "+bytesToHex(challengeRespEncrypted));
+		String secretResp = http.openHttpConnectionToString(http.baseUrl +
+				"/pair?uniqueid="+uniqueId+"&devicename=roth&updateState=1&serverchallengeresp="+bytesToHex(challengeRespEncrypted));
+		if (!NvHTTP.getXmlString(secretResp, "paired").equals("1")) {
+			return PairState.FAILED;
+		}
+		
+		// Get the server's signed secret
+		byte[] serverSecretResp = hexToBytes(NvHTTP.getXmlString(secretResp, "pairingsecret"));
+		byte[] serverSecret = Arrays.copyOfRange(serverSecretResp, 0, 16);
+		byte[] serverSignature = Arrays.copyOfRange(serverSecretResp, 16, 272);
+
+		// Ensure the authenticity of the data
+		if (!verifySignature(serverSecret, serverSignature, serverCert)) {
+			// Cancel the pairing process
+			http.openHttpConnectionToString(http.baseUrl + "/unpair?uniqueid="+uniqueId);
+			
+			// Looks like a MITM
+			return PairState.FAILED;
+		}
+		
+		// Ensure the server challenge matched what we expected (aka the PIN was correct)
+		byte[] serverChallengeRespHash = toSHA1Bytes(concatBytes(concatBytes(randomChallenge, serverCert.getSignature()), serverSecret));
+		System.out.println("Re-calculated server challenge response hash: "+bytesToHex(serverChallengeRespHash));
+		System.out.println("Original challenge response: "+bytesToHex(serverResponse));
+		if (!Arrays.equals(serverChallengeRespHash, serverResponse)) {
+			// Cancel the pairing process
+			http.openHttpConnectionToString(http.baseUrl + "/unpair?uniqueid="+uniqueId);
+			
+			// Probably got the wrong PIN
+			return PairState.PIN_WRONG;
+		}
+		
+		// Send the server our signed secret
+		byte[] clientPairingSecret = concatBytes(clientSecret, signData(clientSecret, pk));
+		System.out.println("Client pairing secret: "+bytesToHex(clientPairingSecret));
+		String clientSecretResp = http.openHttpConnectionToString(http.baseUrl + 
+				"/pair?uniqueid="+uniqueId+"&devicename=roth&updateState=1&clientpairingsecret="+bytesToHex(clientPairingSecret));
+		if (!NvHTTP.getXmlString(clientSecretResp, "paired").equals("1")) {
+			return PairState.FAILED;
+		}
+		
+		// Do the initial challenge (seems neccessary for us to show as paired)
+		String pairChallenge = http.openHttpConnectionToString(http.baseUrl + "/pair?uniqueid="+uniqueId+"&devicename=roth&updateState=1&phrase=pairchallenge");
+		if (!NvHTTP.getXmlString(pairChallenge, "paired").equals("1")) {
+			return PairState.FAILED;
+		}
+		
+		return PairState.PAIRED;
+	}
+}

moonlight-common/src/com/limelight/nvstream/input/NvController.java

@@ -5,6 +5,15 @@ import java.io.OutputStream;
 import java.net.InetAddress;
 import java.net.InetSocketAddress;
 import java.net.Socket;
+import java.security.InvalidAlgorithmParameterException;
+import java.security.InvalidKeyException;
+import java.security.NoSuchAlgorithmException;
+import java.util.Arrays;
+
+import javax.crypto.Cipher;
+import javax.crypto.NoSuchPaddingException;
+import javax.crypto.SecretKey;
+import javax.crypto.spec.IvParameterSpec;
 
 public class NvController {
 	
@@ -15,10 +24,27 @@ public class NvController {
 	private InetAddress host;
 	private Socket s;
 	private OutputStream out;
+	private Cipher riCipher;
 
-	public NvController(InetAddress host)
+	
+	private final static byte[] ENCRYPTED_HEADER = new byte[] {0x00, 0x00, 0x00, 0x20};
+	
+	public NvController(InetAddress host, SecretKey riKey)
 	{
 		this.host = host;
+		try {
+			// This cipher is guaranteed to be supported
+			this.riCipher = Cipher.getInstance("AES/CBC/NoPadding");
+			this.riCipher.init(Cipher.ENCRYPT_MODE, riKey, new IvParameterSpec(new byte[16]));
+		} catch (NoSuchAlgorithmException e) {
+			e.printStackTrace();
+		} catch (NoSuchPaddingException e) {
+			e.printStackTrace();
+		} catch (InvalidKeyException e) {
+			e.printStackTrace();
+		} catch (InvalidAlgorithmParameterException e) {
+			e.printStackTrace();
+		}
 	}
 	
 	public void initialize() throws IOException
@@ -36,36 +62,51 @@ public class NvController {
 		} catch (IOException e) {}
 	}
 	
+	private byte[] encryptAesInputData(byte[] data) throws Exception {
+		// Input data is rounded to units of 32 bytes
+		byte[] blockRoundedData = Arrays.copyOf(data, 32);
+		return riCipher.update(blockRoundedData);
+	}
+	
+	private void sendPacket(InputPacket packet) throws IOException {
+		out.write(ENCRYPTED_HEADER);
+		byte[] encryptedInput;
+		try {
+			encryptedInput = encryptAesInputData(packet.toWire());
+		} catch (Exception e) {
+			// Should never happen
+			e.printStackTrace();
+			return;
+		}
+		out.write(encryptedInput);
+		out.flush();
+	}
+	
 	public void sendControllerInput(short buttonFlags, byte leftTrigger, byte rightTrigger,
 			short leftStickX, short leftStickY, short rightStickX, short rightStickY) throws IOException
 	{
-		out.write(new ControllerPacket(buttonFlags, leftTrigger,
+		sendPacket(new ControllerPacket(buttonFlags, leftTrigger,
 				rightTrigger, leftStickX, leftStickY,
-				rightStickX, rightStickY).toWire());
+				rightStickX, rightStickY));
-		out.flush();
 	}
 	
 	public void sendMouseButtonDown(byte mouseButton) throws IOException
 	{
-		out.write(new MouseButtonPacket(true, mouseButton).toWire());
+		sendPacket(new MouseButtonPacket(true, mouseButton));
-		out.flush();
 	}
 	
 	public void sendMouseButtonUp(byte mouseButton) throws IOException
 	{
-		out.write(new MouseButtonPacket(false, mouseButton).toWire());
+		sendPacket(new MouseButtonPacket(false, mouseButton));
-		out.flush();
 	}
 	
 	public void sendMouseMove(short deltaX, short deltaY) throws IOException
 	{
-		out.write(new MouseMovePacket(deltaX, deltaY).toWire());
+		sendPacket(new MouseMovePacket(deltaX, deltaY));
-		out.flush();
 	}
 	
 	public void sendKeyboardInput(short keyMap, byte keyDirection, byte modifier) throws IOException 
 	{
-		out.write(new KeyboardPacket(keyMap, keyDirection, modifier).toWire());
+		sendPacket(new KeyboardPacket(keyMap, keyDirection, modifier));
-		out.flush();
 	}
 }