/// <summary>
/// Generates aes based on key and iv, that we get from login server.
/// Used only in world server.
/// </summary>
/// <param name="key">bytes for key</param>
/// <param name="iv">bytes for iv</param>
public void GenerateAES(byte[] key, byte[] iv)
{
Key = key;
IV = iv;
byte[] hashed = SHA256.Create().ComputeHash(IV);
Array.Copy(hashed, IV, 16);
// Decryption settings
AesRecv = new Aes128CounterMode(IV);
CryptoRecv = AesRecv.CreateDecryptor(Key, null);
// Encryption settings
AesSend = new Aes128CounterMode(IV);
CryptoSend = AesSend.CreateEncryptor(Key, null);
}
/// <summary>
/// Generates aes based on rsa decrypted number.
/// Used only in login server.
/// </summary>
/// <param name="DecryptedMessage">big integer number, that we get from game.exe</param>
public void GenerateAES(BigInteger DecryptedMessage)
{
HMACSHA256 hmac = new HMACSHA256(DecryptedMessage.ToByteArray());
byte[] HmacBytes = hmac.ComputeHash(RSAModulus);
Key = new byte[16];
IV = new byte[16];
Array.Copy(HmacBytes, 0, Key, 0, 16);
Array.Copy(HmacBytes, 16, IV, 0, 16);
// Decryption settings
AesRecv = new Aes128CounterMode(IV);
CryptoRecv = AesRecv.CreateDecryptor(Key, null);
// Encryption settings
AesSend = new Aes128CounterMode(IV);
CryptoSend = AesSend.CreateEncryptor(Key, null);
}