code: def get_byte_array(integer):
      
      # Operate in big endian (unlike most of Telegram API) since:
      # > "...pq is a representation of a natural number
      #    (in binary *big endian* format)..."
      # > "...current value of dh_prime equals
      #    (in *big-endian* byte order)..."
      # Reference: https://core.telegram.org/mtproto/auth_key
      return int.to_bytes(
          integer,
          (integer.bit_length() + 8 - 1) // 8,  # 8 bits per byte,
          byteorder='big',
          signed=False
      )
docs: Return the variable length bytes corresponding to the given int