/// <summary>
/// Decrypts the packet data
/// </summary>
public void Decrypt(Span <byte> data)
{
if (!RecvCipher.Handshaken)
{
var pr = new BinaryReader(new MemoryStream(MapleCipher.Handshake(data).ToArray(), false),
Encoding.ASCII);
var version = pr.ReadInt16();
var subVersionLength = pr.ReadInt16();
var subVersion = new string(pr.ReadChars(subVersionLength));
var siv = pr.ReadUInt32();
var riv = pr.ReadUInt32();
var serverType = pr.ReadByte();
SendCipher.SetIv(siv);
RecvCipher.SetIv(riv);
HandshakeFinished?.Invoke(siv, riv, version, subVersion, serverType);
}
else
{
if (!RecvCipher.CheckHeader(data, !ToClient))
{
throw new InvalidOperationException($"Packet header mismatch Size:{data.Length}");
}
var decrypted = RecvCipher.Decrypt(data);
if (decrypted.Length == 0)
{
return;
}
PacketFinished?.Invoke(decrypted.ToArray());
}
}
/// <summary>
/// Sets the Recv and Send Vectors for the ciphers
/// </summary>
public void SetVectors(uint siv, uint riv)
{
SendCipher.SetIv(siv);
RecvCipher.SetIv(riv);
}