public void PackAuthData(byte[] data, int datalength, byte[] outdata, out int outlength)
{
const int authhead_len = 4 + 8 + 4 + 16 + 4;
byte[] encrypt = new byte[24];
AuthDataAesChain authData = this.Server.data as AuthDataAesChain;
lock (authData)
{
if (authData.connectionID > 0xFF000000)
{
authData.clientID = null;
}
if (authData.clientID == null)
{
authData.clientID = new byte[4];
g_random.GetBytes(authData.clientID);
authData.connectionID = (UInt32)BitConverter.ToInt32(authData.clientID, 0) % 0xFFFFFD;
}
authData.connectionID += 1;
Array.Copy(authData.clientID, 0, encrypt, 4, 4);
Array.Copy(BitConverter.GetBytes(authData.connectionID), 0, encrypt, 8, 4);
}
outlength = authhead_len;
byte[] encrypt_data = new byte[32];
byte[] key = new byte[Server.iv.Length + Server.key.Length];
Server.iv.CopyTo(key, 0);
Server.key.CopyTo(key, Server.iv.Length);
UInt64 utc_time_second = (UInt64)Math.Floor(DateTime.UtcNow.Subtract(new DateTime(1970, 1, 1, 0, 0, 0)).TotalSeconds);
UInt32 utc_time = (UInt32)(utc_time_second);
Array.Copy(BitConverter.GetBytes(utc_time), 0, encrypt, 0, 4);
encrypt[12] = (byte)(Server.overhead);
encrypt[13] = (byte)(Server.overhead >> 8);
send_tcp_mss = 1024; //random.Next(1024) + 400;
recv_tcp_mss = send_tcp_mss;
encrypt[14] = (byte)(send_tcp_mss);
encrypt[15] = (byte)(send_tcp_mss >> 8);
// first 12 bytes
{
byte[] rnd = new byte[4];
random.NextBytes(rnd);
rnd.CopyTo(outdata, 0);
MbedTLS.HMAC md5 = CreateHMAC(key);
byte[] md5data = md5.ComputeHash(rnd, 0, rnd.Length);
last_client_hash = md5data;
Array.Copy(md5data, 0, outdata, rnd.Length, 8);
}
// uid & 16 bytes auth data
{
byte[] uid = new byte[4];
int index_of_split = Server.param.IndexOf(':');
if (index_of_split > 0)
{
try
{
uint user = uint.Parse(Server.param.Substring(0, index_of_split));
user_key = System.Text.Encoding.UTF8.GetBytes(Server.param.Substring(index_of_split + 1));
BitConverter.GetBytes(user).CopyTo(uid, 0);
}
catch (Exception ex)
{
Logging.Log(LogLevel.Warn, $"Faild to parse auth param, fallback to basic mode. {ex}");
}
}
if (user_key == null)
{
random.NextBytes(uid);
user_key = Server.key;
}
for (int i = 0; i < 4; ++i)
{
uid[i] ^= last_client_hash[8 + i];
}
byte[] encrypt_key = user_key;
Encryption.IEncryptor encryptor = Encryption.EncryptorFactory.GetEncryptor("aes-128-cbc", System.Convert.ToBase64String(encrypt_key) + SALT, false);
int enc_outlen;
encryptor.SetIV(new byte[] { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 });
encryptor.Encrypt(encrypt, 16, encrypt_data, out enc_outlen);
encryptor.Dispose();
Array.Copy(encrypt_data, 0, encrypt, 4, 16);
uid.CopyTo(encrypt, 0);
}
// final HMAC
{
MbedTLS.HMAC md5 = CreateHMAC(user_key);
byte[] md5data = md5.ComputeHash(encrypt, 0, 20);
last_server_hash = md5data;
Array.Copy(md5data, 0, encrypt, 20, 4);
}
encrypt.CopyTo(outdata, 12);
encryptor = EncryptorFactory.GetEncryptor("chacha20", System.Convert.ToBase64String(user_key) + System.Convert.ToBase64String(last_client_hash, 0, 16), false);
{
byte[] iv = new byte[8];
Array.Copy(last_client_hash, iv, 8);
encryptor.SetIV(iv);
}
{
int pack_outlength;
encryptor.Decrypt(last_server_hash, 8, outdata, out pack_outlength);
}
// combine first chunk
{
byte[] pack_outdata = new byte[outdata.Length];
int pack_outlength;
PackData(data, datalength, pack_outdata, out pack_outlength);
Array.Copy(pack_outdata, 0, outdata, outlength, pack_outlength);
outlength += pack_outlength;
}
}
public void PackAuthData(byte[] data, int datalength, byte[] outdata, out int outlength)
{
int rand_len = (datalength > 400 ? random.Next(512) : random.Next(1024));
int data_offset = rand_len + 16 + 10 + 4;
outlength = data_offset + datalength + 4;
byte[] encrypt = new byte[30];
byte[] encrypt_data = new byte[32];
AuthData authData = (AuthData)this.Server.data;
{
byte[] rnd_data = new byte[rand_len];
random.NextBytes(rnd_data);
rnd_data.CopyTo(outdata, data_offset - rand_len);
}
lock (authData)
{
if (authData.connectionID > 0xFF000000)
{
authData.clientID = null;
}
if (authData.clientID == null)
{
authData.clientID = new byte[4];
g_random.GetBytes(authData.clientID);
authData.connectionID = (UInt32)BitConverter.ToInt32(authData.clientID, 0) % 0xFFFFFD; // random.Next(0x1000000);
}
authData.connectionID += 1;
Array.Copy(authData.clientID, 0, encrypt, 4, 4);
Array.Copy(BitConverter.GetBytes(authData.connectionID), 0, encrypt, 8, 4);
}
UInt64 utc_time_second = (UInt64)Math.Floor(DateTime.UtcNow.Subtract(new DateTime(1970, 1, 1, 0, 0, 0)).TotalSeconds);
UInt32 utc_time = (UInt32)(utc_time_second);
Array.Copy(BitConverter.GetBytes(utc_time), 0, encrypt, 0, 4);
encrypt[12] = (byte)(outlength);
encrypt[13] = (byte)(outlength >> 8);
encrypt[14] = (byte)(rand_len);
encrypt[15] = (byte)(rand_len >> 8);
{
byte[] uid = new byte[4];
random.NextBytes(uid);
byte[] encrypt_key = new byte[Server.key.Length + 4];
uid.CopyTo(encrypt_key, 0);
Server.key.CopyTo(encrypt_key, 4);
Encryption.IEncryptor encryptor = Encryption.EncryptorFactory.GetEncryptor("aes-128-cbc", System.Convert.ToBase64String(encrypt_key) + SALT);
int enc_outlen;
encryptor.SetIV(new byte[] { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 });
encryptor.Encrypt(encrypt, 16, encrypt_data, out enc_outlen);
encryptor.Dispose();
Array.Copy(encrypt_data, 16, encrypt, 4, 16);
uid.CopyTo(encrypt, 0);
}
{
byte[] key = new byte[Server.iv.Length + Server.key.Length];
Server.iv.CopyTo(key, 0);
Server.key.CopyTo(key, Server.iv.Length);
HMACSHA1 sha1 = new HMACSHA1(key);
byte[] sha1data = sha1.ComputeHash(encrypt, 0, 20);
Array.Copy(sha1data, 0, encrypt, 20, 10);
}
encrypt.CopyTo(outdata, 0);
Array.Copy(data, 0, outdata, data_offset, datalength);
ulong adler = Util.Adler32.CalcAdler32(outdata, outlength - 4);
BitConverter.GetBytes((uint)adler).CopyTo(outdata, outlength - 4);
}
public void PackAuthData(byte[] data, int datalength, byte[] outdata, out int outlength)
{
int rand_len = (datalength > 400 ? random.Next(512) : random.Next(1024));
int data_offset = rand_len + 16 + 4 + 4 + 7;
outlength = data_offset + datalength + 4;
byte[] encrypt = new byte[24];
byte[] encrypt_data = new byte[32];
byte[] key = new byte[Server.iv.Length + Server.key.Length];
Server.iv.CopyTo(key, 0);
Server.key.CopyTo(key, Server.iv.Length);
AuthData authData = (AuthData)this.Server.data;
{
byte[] rnd_data = new byte[rand_len];
random.NextBytes(rnd_data);
rnd_data.CopyTo(outdata, data_offset - rand_len);
}
lock (authData)
{
if (authData.connectionID > 0xFF000000)
{
authData.clientID = null;
}
if (authData.clientID == null)
{
authData.clientID = new byte[4];
g_random.GetBytes(authData.clientID);
authData.connectionID = (UInt32)BitConverter.ToInt32(authData.clientID, 0) % 0xFFFFFD; // random.Next(0x1000000);
}
authData.connectionID += 1;
Array.Copy(authData.clientID, 0, encrypt, 4, 4);
Array.Copy(BitConverter.GetBytes(authData.connectionID), 0, encrypt, 8, 4);
}
UInt64 utc_time_second = (UInt64)Math.Floor(DateTime.UtcNow.Subtract(new DateTime(1970, 1, 1, 0, 0, 0)).TotalSeconds);
UInt32 utc_time = (UInt32)(utc_time_second);
Array.Copy(BitConverter.GetBytes(utc_time), 0, encrypt, 0, 4);
encrypt[12] = (byte)(outlength);
encrypt[13] = (byte)(outlength >> 8);
encrypt[14] = (byte)(rand_len);
encrypt[15] = (byte)(rand_len >> 8);
{
byte[] uid = new byte[4];
int index_of_split = Server.param.IndexOf(':');
if (index_of_split > 0)
{
try
{
uint user = uint.Parse(Server.param.Substring(0, index_of_split));
user_key = hash(System.Text.Encoding.UTF8.GetBytes(Server.param.Substring(index_of_split + 1)));
BitConverter.GetBytes(user).CopyTo(uid, 0);
}
catch (Exception ex)
{
Logging.Log(LogLevel.Warn, $"Faild to parse auth param, fallback to basic mode. {ex}");
}
}
if (user_key == null)
{
random.NextBytes(uid);
user_key = Server.key;
}
byte[] encrypt_key = user_key;
Encryption.IEncryptor encryptor = Encryption.EncryptorFactory.GetEncryptor("aes-128-cbc", System.Convert.ToBase64String(encrypt_key) + SALT);
int enc_outlen;
encryptor.SetIV(new byte[] { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 });
encryptor.Encrypt(encrypt, 16, encrypt_data, out enc_outlen);
encryptor.Dispose();
Array.Copy(encrypt_data, 16, encrypt, 4, 16);
uid.CopyTo(encrypt, 0);
}
{
MbedTLS.HMAC sha1 = CreateHMAC(key);
byte[] sha1data = sha1.ComputeHash(encrypt, 0, 20);
Array.Copy(sha1data, 0, encrypt, 20, 4);
}
{
byte[] rnd = new byte[1];
random.NextBytes(rnd);
rnd.CopyTo(outdata, 0);
MbedTLS.HMAC sha1 = CreateHMAC(key);
byte[] sha1data = sha1.ComputeHash(rnd, 0, rnd.Length);
Array.Copy(sha1data, 0, outdata, rnd.Length, 7 - rnd.Length);
}
encrypt.CopyTo(outdata, 7);
Array.Copy(data, 0, outdata, data_offset, datalength);
{
MbedTLS.HMAC sha1 = CreateHMAC(user_key);
byte[] sha1data = sha1.ComputeHash(outdata, 0, outlength - 4);
Array.Copy(sha1data, 0, outdata, outlength - 4, 4);
}
}
