BytesToUint convers a number of bytes into a uint64 The allowed in lengths are: 2: for a uint16 encoded as uint64 4: for a uint32 encoded as uint64 8: for a uint64.

UintToBytes converst a uint64 into a number of bytes The size param defines the size of the output buffer The allowed sizes are: 16: converts the in to uint16 and returns a 2 byte buffer 32: converts the in to uint32 and returns a 4 byte buffer 64: returns a 8 byte buffer.