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Michael Hamburg authored
Continuing demagication and factoring of field code. Removing high-level ops from p448.h and putting them in field.h. That way they won't need rewriting for new fields and architectures. Create constant_time.h which contains constant-time lookups, condswaps, etc. That way the code is the same on all architectures, instead of varying depending on whether the field size is a multiple of the vector register size. I should still add a constant_time_select to factor out field_cond_negate. TODO: I need to test this for correctness and performance on various platforms. It works on my Mac, but since Yosemite the timing is totally unpredictable (background tasks? variable boost?).
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