Signed-digit multi-comb for ecmult_gen (by peterdettman)#693

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sipa wants to merge 8 commits intobitcoin-core:masterfrom sipa:201911_peterdettman_sdmc

Commits on Mar 18, 2021

Signed-digit multi-comb for ecmult_gen

peterdettman
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sipa
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Support static precomputation with multi-comb

peterdettman
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sipa
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Add comments for context offset

peterdettman
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sipa
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Reduce side-channels from single-bit reads

peterdettman
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sipa
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Avoid unnecessary doublings in precomputation

peterdettman
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sipa
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Add precompiler guards on comb constants

peterdettman
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sipa
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Remove old ecmult_gen code and always use multi-comb
sipa
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Make COMB_BLOCKS and COMB_TEETH configurable, and test in Cirrus
sipa
committed