SortByDistance takes a KeySpace, a center Key, and a list of Keys toSort.

XOR takes two byte slices, XORs them together, returns the resulting slice.

ZeroPrefixLen returns the number of consecutive zeroes in a byte slice.

XORKeySpace is a KeySpace which: - normalizes identifiers using a cryptographic hash (sha256) - measures distance by XORing keys together.

Key represents an identifier in a KeySpace.

KeySpace is an object used to do math on identifiers.