using System;

namespace Filter.Networking.Instances
{
    internal class FiestaCrypto
    {
        public Int16 Xor;

        public FiestaCrypto(Int16 TransferXor) { Xor = TransferXor; }

        public void Crypt(Byte[] Buffer, Int32 Start, Int32 Length)
        {
            for (Int32 Counter = 0; Counter < Length; Counter++)
            {
                Buffer[Start + Counter] ^= XorTable[Xor];

                Xor++;

                if (Xor == 499) { Xor = 0; }
            }
        }

        public void Crypt1(Byte[] Buffer, Int32 Start, Int32 Length)
        {
            for (Int32 Counter = 0; Counter < Length; Counter++)
            {
                Buffer[Start + Counter] ^= XorTable[Xor];

                Xor--;

                if (Xor == 499) { Xor = 0; }
            }
        }

        private readonly Byte[] XorTable = Program.Config.CryptoTable.ToArray();
    }
}