Ciper

        public void Decrypt(Span<byte> src, Span<byte> dst)
        {
            if (!Decrypt2)
            {
                for (int i = 0; i < src.Length; i++)
                {
                    dst[i] = (byte)(src[i] ^ 0xAB);
                    dst[i] = (byte)(dst[i] >> 4 | dst[i] << 4);
                    dst[i] = (byte)(dst[i] ^ (_cryptKey2[_decryptCounter.Key2] ^ _cryptKey1[_decryptCounter.Key1]));
                    _decryptCounter.Increment();
                }
            }
            else
            {
                for (int i = 0; i < src.Length; i++)
                {
                    dst[i] = (byte)(src[i] ^ 0xAB);
                    dst[i] = (byte)(dst[i] >> 4 | dst[i] << 4);
                    dst[i] = (byte)(dst[i] ^ (_cryptKey4[_decryptCounter.Key2] ^ _cryptKey3[_decryptCounter.Key1]));
                    _decryptCounter.Increment();
                }
            }
        }



        public void Encrypt(Span<byte> src, Span<byte> dst)
        {
            for (int i = 0; i < src.Length; i++)
            {
                dst[i] = (byte)(src[i] ^ 0xAB);
                dst[i] = (byte)(dst[i] >> 4 | dst[i] << 4);
                dst[i] = (byte)(dst[i] ^ (_cryptKey1[_encryptCounter.Key1] ^ _cryptKey2[_encryptCounter.Key2]));
                _encryptCounter.Increment();
            }
        }