iang/arctic: Library and benchmark program for Arctic and Shine @ 90f80136c2ee9b9469c9f8adbfa570e783d0eecf

Library and benchmark program for Arctic and Shine

Ian Goldberg 90f80136c2 Add some comments about the hash functions		2 lat temu
src	90f80136c2 Add some comments about the hash functions	2 lat temu
Cargo.toml	55187fb080 Use itertools::combinations instead of rolling our own	2 lat temu