For the latest Habbo version use the HabboEncryption class. To initialize the HabboEncryption class, put this in your main class somewhere
// Load your rsa keys (D, Modules and Exponent).
RSACParameters rsaParameters = RSACParameters.FromXmlFile(@"D:\path\to\your\rsa.keys");
HabboEncryption.GetInstance(rsaParameters, 128); // returns a new static instance of the encryption handler with 128bits diffiehellman keys.
// or
HabboEncryption habboEncryption = new HabboEncryption(rsaParameters, 128); // creates a new instance of the encryption handler with 128bits diffiehellman keys.
For the initialization for the crypto event is the packet: string, string
response.WriteString(HabboEncryption.GetInstance().GetRSADiffieHellmanPKey());
response.WriteString(HabboEncryption.GetInstance().GetRSADiffieHellmanGKey());
And for the last message event which you get after sending the initialization packet is
string cipherPublicKey = request.ReadString();
BigInteger sharedKey = HabboEncryption.GetInstance().CalculateDiffieHellmanSharedKey(cipherPublicKey);
if (sharedKey != 0)
{
ARC4 rc4 = HabboEncryption.InitializeARC4(sharedKey);
}
else
{
// throw a error
}
// Initialize a new response
response.WriteString(HabboEncryption.GetInstance().GetRSADiffieHellmanPublicKey());
When not using the static method, change up HabboEncryption.GetInstance() to your variable instance.
NOTE: C# BigInteger class uses and returns LittleEndian byte array!