public override void SetKey(byte[] data, int offset, int length)
{
var key = NetUtility.ComputeSHAHash(data, offset, length);
NetException.Assert(key.Length >= 16);
SetKey(key, 0, 16);
}
public override void SetKey(ReadOnlySpan <byte> data, int offset, int length)
{
// ReSharper disable once SuggestVarOrType_Elsewhere
Span <byte> key = stackalloc byte[32];
NetUtility.ComputeSHAHash(data.Slice(offset, length), key);
NetException.Assert(key.Length >= 16);
SetKey(key, 0, 16);
}
/// <summary>
/// Computer private key (x)
/// </summary>
public static byte[] ComputePrivateKey(string username, string password, byte[] salt)
{
byte[] tmp = Encoding.UTF8.GetBytes(username + ":" + password);
byte[] innerHash = NetUtility.ComputeSHAHash(tmp);
byte[] total = new byte[innerHash.Length + salt.Length];
Buffer.BlockCopy(salt, 0, total, 0, salt.Length);
Buffer.BlockCopy(innerHash, 0, total, salt.Length, innerHash.Length);
// x ie. H(salt || H(username || ":" || password))
return(new NetBigInteger(NetUtility.ToHexString(NetUtility.ComputeSHAHash(total)), 16).ToByteArrayUnsigned());
}
/// <summary>
/// Compute multiplier (k)
/// </summary>
private static NetBigInteger ComputeMultiplier()
{
string one = NetUtility.ToHexString(N.ToByteArrayUnsigned());
string two = NetUtility.ToHexString(g.ToByteArrayUnsigned());
string ccstr = one + two.PadLeft(one.Length, '0');
byte[] cc = NetUtility.ToByteArray(ccstr);
var ccHashed = NetUtility.ComputeSHAHash(cc);
return(new NetBigInteger(NetUtility.ToHexString(ccHashed), 16));
}
/// <summary>
/// Compute intermediate value (u)
/// </summary>
public static byte[] ComputeU(byte[] clientPublicEphemeral, byte[] serverPublicEphemeral)
{
// u = SHA-1(A || B)
string one = NetUtility.ToHexString(clientPublicEphemeral);
string two = NetUtility.ToHexString(serverPublicEphemeral);
int len = 66; // Math.Max(one.Length, two.Length);
string ccstr = one.PadLeft(len, '0') + two.PadLeft(len, '0');
byte[] cc = NetUtility.ToByteArray(ccstr);
var ccHashed = NetUtility.ComputeSHAHash(cc);
return(new NetBigInteger(NetUtility.ToHexString(ccHashed), 16).ToByteArrayUnsigned());
}
private void InitializeNetwork()
{
lock (m_initializeLock)
{
// make sure this is properly set up again, if required.
// start network thread if not running
NetPeerManager.StartNetworkThread();
m_configuration.Lock();
if (m_status == NetPeerStatus.Running)
{
return;
}
if (m_configuration.m_enableUPnP)
{
m_upnp = new NetUPnP(this);
}
InitializePools();
m_releasedIncomingMessages.Clear();
m_unsentUnconnectedMessages.Clear();
_handshakeManager.Handshakes.Clear();
// bind to socket
BindSocket(false);
m_receiveBuffer = new byte[m_configuration.ReceiveBufferSize];
m_sendBuffer = new byte[m_configuration.SendBufferSize];
m_readHelperMessage = new NetIncomingMessage(NetIncomingMessageType.Error);
m_readHelperMessage.m_data = m_receiveBuffer;
byte[] macBytes = NetUtility.GetMacAddressBytes();
var boundEp = m_socket.LocalEndPoint as NetEndPoint;
byte[] epBytes = BitConverter.GetBytes(boundEp.GetHashCode());
byte[] combined = new byte[epBytes.Length + macBytes.Length];
Array.Copy(epBytes, 0, combined, 0, epBytes.Length);
Array.Copy(macBytes, 0, combined, epBytes.Length, macBytes.Length);
m_uniqueIdentifier = BitConverter.ToInt64(NetUtility.ComputeSHAHash(combined), 0);
m_status = NetPeerStatus.Running;
}
}
/// <summary>
/// Create XTEA symmetrical encryption object from sessionValue
/// </summary>
public static NetXtea CreateEncryption(NetPeer peer, byte[] sessionValue)
{
var hash = NetUtility.ComputeSHAHash(sessionValue);
var key = new byte[16];
for (int i = 0; i < 16; i++)
{
key[i] = hash[i];
for (int j = 1; j < hash.Length / 16; j++)
{
key[i] ^= hash[i + (j * 16)];
}
}
return(new NetXtea(peer, key));
}
/// <summary>
/// String to hash for key
/// </summary>
public NetXtea(NetPeer peer, string key)
: this(peer, NetUtility.ComputeSHAHash(Encoding.UTF8.GetBytes(key)), 32)
{
}