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The new structure of those modules is along similar lines to the recent rewrite of AES, with selection of HW vs SW implementation being done by the main vtable instead of a subsidiary function pointer within it, freedom for each implementation to define its state structure however is most convenient, and space to drop in other hardware-accelerated implementations. I've removed the centralised test for compiler SHA-NI support in ssh.h, and instead duplicated it between the two SHA modules, on the grounds that once you start considering an open-ended set of hardware accelerators, the two hashes _need_ not go together. I've also added an extra test in cryptsuite that checks the point at which the end-of-hash padding switches to adding an extra cipher block. That was just because I was rewriting that padding code, was briefly worried that I might have got an off-by-one error in that part of it, and couldn't see any existing test that gave me confidence I hadn't.