GCNet is a Grand Chase networking library created by SyntaxDev which provides cryptography and packet-related features.
The CoreLib provides some core features like packet encryption and decryption, packet authentication with HMAC, compression and key generation.
The PacketLib gives an I/O packet managing by providing data reading and writing in addition to the own cryptography functions.
To build the project, you should use Visual Studio 2015 with .NET Framework 4.5.2.