New initializes a sharetoken store in the directory under the path given by the dir argument.

ContractKeyFunc is the standard key derivation function for service contracts.

DuplicateSTError is returned if a sharetoken which was already seen is being added to the store.

RelayKeyFunc is the standard key derivation function for relays.

T is the type of a sharetoken store.

KeyFunc is the type of key derivation functions for this sharetoken store.