Yields all the hashes in the file store.

    Args:
      age: AFF4 age specification. Only get hits corresponding to the given age
        spec. Should be aff4.NEWEST_TIME or a time range given as a tuple
        (start, end) in microseconds since Jan 1st, 1970. If just a microseconds
        value is given it's treated as the higher end of the range, i.e. (0,
        age). See aff4.FACTORY.ParseAgeSpecification for details.

    Yields:
      FileStoreHash instances corresponding to all the hashes in the file store.

    Raises:
      ValueError: if age was set to aff4.ALL_TIMES.

def ListHashes(age=aff4.NEWEST_TIME):
    """Yields all the hashes in the file store.

    Args:
      age: AFF4 age specification. Only get hits corresponding to the given age
        spec. Should be aff4.NEWEST_TIME or a time range given as a tuple
        (start, end) in microseconds since Jan 1st, 1970. If just a microseconds
        value is given it's treated as the higher end of the range, i.e. (0,
        age). See aff4.FACTORY.ParseAgeSpecification for details.

    Yields:
      FileStoreHash instances corresponding to all the hashes in the file store.

    Raises:
      ValueError: if age was set to aff4.ALL_TIMES.
    """
    if age == aff4.ALL_TIMES:
      raise ValueError("age==aff4.ALL_TIMES is not allowed.")

    urns = []
    for fingerprint_type, hash_types in iteritems(HashFileStore.HASH_TYPES):
      for hash_type in hash_types:
        urns.append(HashFileStore.PATH.Add(fingerprint_type).Add(hash_type))

    for _, values in aff4.FACTORY.MultiListChildren(urns, age=age):
      for value in values:
        yield FileStoreHash(value)