func Hash(k0, k1 uint64, p []byte) uint64 {
	var d digest
	d.size = Size
	d.k0 = k0
	d.k1 = k1
	d.Reset()
	d.Write(p)
	return d.Sum64()
}
NB: ARM implementation of forgoes extra speed for Hash()
and Hash128() by simply reusing the same blocks() implementation
in assembly used by the streaming hash.
package siphash