/// <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());
}
}
public MapleCipherProvider(ushort currentGameVersion, ulong aesKey, bool useAesEncryption = true,
bool toClient = true)
{
RecvCipher = new MapleCipher(currentGameVersion, aesKey, useAesEncryption);
SendCipher = new MapleCipher(currentGameVersion, aesKey, useAesEncryption);
ToClient = toClient;
}
public MapleCipherProvider(ushort currentGameVersion, ulong?aesKey,
bool toClient = true)
{
RecvCipher = new MapleCipher(currentGameVersion, aesKey);
SendCipher = new MapleCipher(currentGameVersion, aesKey);
ToClient = toClient;
}
/// <summary>
/// Gets the packet header from the current packet.
/// </summary>
public int GetHeader(ReadOnlySequence <byte> buffer) => RecvCipher
.Handshaken
? 4 + MapleCipher.GetPacketLength(buffer.Slice(0, 4).ToArray())
: 2 + BitConverter.ToUInt16(buffer.Slice(0, 2).ToArray());
