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This crate is mostly a copy-paste of the
cast5
code. Apart from everything being larger in size, there are a couple main differences:forward_quad()
andbackward_quad()
replace the directfX!()
calls, andCast6::key_schedule()
is implemented more regularly in terms offorward_octave()
. TheTM
andTR
arrays were generated from the algorithm in the RFC; since it only takes a bunch of wrapping additions, it might be worthwhile to construct one or both arrays with a const function, or even to compute each element at runtime.