void handle()
{
// This packet is complicated, so I will comment the process.
// Let's get the data off the line first..
string serverID = sock.readString();
short keyLength = sock.readShort();
short verifyLength;
byte[] key;
byte[] token;
key = sock.readByteArray(keyLength);
verifyLength = sock.readShort();
token = sock.readByteArray(verifyLength);
//Here, we need some random bytes to use as a shared key with the server.
RandomNumberGenerator random = RandomNumberGenerator.Create();
random.GetBytes(myform.sharedkey);
// AsnKeyParser is a part of the cryptography.dll, which is simply a compiled version
// of SMProxy's Cryptography.cs, with the server side parts stripped out.
// You pass it the key data and ask it to parse, and it will
// Extract the server's public key, then parse that into RSA for us.
AsnKeyParser keyParser = new AsnKeyParser(key);
RSAParameters Dekey = keyParser.ParseRSAPublicKey();
// Now we create an encrypter, and encrypt the token sent to us by the server
// as well as our newly made shared key (Which can then only be decrypted with the server's private key)
// and we send it to the server.
RSACryptoServiceProvider cryptoService = new RSACryptoServiceProvider();
cryptoService.ImportParameters(Dekey);
byte[] EncryptedSecret = cryptoService.Encrypt(myform.sharedkey, false);
byte[] EncryptedVerfy = cryptoService.Encrypt(token, false);
// I pass this information back up (Unencrypted) to the main form.
// This allows me to have it ready for when I need this later.
myform.ServerID = serverID;
myform.token = token;
myform.PublicKey = key;
if (serverID != "-" && myform.onlineMode)
{
// Verify with Minecraft.net, if need be.
// At this point, the server requires a hash containing the server id,
// shared key, and original public key. So we make this, and then pass to Minecraft.net
List <byte> hashlist = new List <byte>();
hashlist.AddRange(System.Text.Encoding.ASCII.GetBytes(serverID));
hashlist.AddRange(myform.sharedkey);
hashlist.AddRange(key);
byte[] hashData = hashlist.ToArray();
string hash = JavaHexDigest(hashData);
myform.serverHash = hash;
Minecraft_Net_Interaction verify = new Minecraft_Net_Interaction();
if (!verify.VerifyName(myform.username, myform.sessionId, hash))
{
myform.puts("Failed to verify name with minecraft.net");
sock._stream.Close();
myform.sessionId = null;
return;
}
}
else
{
// Skip Verification, user is not online.
myform.puts("Skipping verification.");
}
// Sets up the socket for encryption, but does not enable it yet.
sock.InitEncryption(myform.sharedkey);
// Respond to server.
EncResponse Response = new EncResponse(sock, myform, EncryptedVerfy, EncryptedSecret, true);
}