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Work in progress. Probably won't even compile, much less run.
Requires corresponding new core/math/modexpa7 core.
No support (yet) for ASN.1 encoding of speedup factors or storage of
same in keystore.
No support (yet) for running CRT algorithm in parallel cores.
Minor cleanup of ancient bus I/O code, including EIM and I2C bus code
we'll probably never use again.
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Trying to make RSA key generation run in constant time is probably
both futile and unnecessary, so we can speed it up a bit by switching
the ModExpA7 core to use "fast" mode rather than "constant time" mode.
Sadly, while this change produces a measureable improvement, it
doesn't bring FGPA ModExp anywhere near the speed of the software
equivalent in this case. Don't really know why.
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Find a suitable core, and mark it busy. Don't forget to release it as soon
as you're done. This has a knock-on effect of un-const'ing core arguments
and struct fields in a lot of places, and it moves some core checks around.
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Compiles, not yet tested.
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fast path.
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test-rsa to use hal_modexp(), and generate a new set of test keys
without the whacky padding, since hal_modexp() now handles that.
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