Hashing with SL2
An algebraic hash function, inspired by the paper Hashing with SL2 by Tillich and Zemor.
The hash function is based on matrix multiplication in the special linear group of degree 2, over a Galois field of order 2127, with all computations modulo the polynomial x127 + x63 + 1.
This construction gives some nice properties, which traditional bit-scambling hash functions don't possess, including it being composable. It holds:
hash (m1 <> m2) == hash m1 <> hash m2
Following that, the hash function is also parallelisable. If a message
m can be divided into a list of chunks
cs, the hash of the message can be calculated in parallel:
mconcat (parMap rpar hash cs) == hash m
All operations in this package are implemented in a very efficient manner using SSE instructions.