rangeproof: initial set of cleanups, minor stack space improvements #150
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Add two new fixed rangeproof vectors; check that various extracted values are correct; add a test for creating and verifying single-value proofs.
This decreases rangeproof proving stack size by 224 bytes on my system. Though the point is not to show large stack reductions (yet) but to demo the closure API on something simple/non-invasive. Future commits will use this for scalars and public keys, and then we will see some serious stack reduction.
Reduces stack usage of rangeproof_sign by 1056 bytes, is a bit safer as it doesn't require the caller of borromean_sign to know which indices are going to be overwritten, is a net-negative code diff, and will simplify things for the next step of closure-ification.
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This is purely to reduce the number of arguments being passed into one function at once. Also improves const-correctness.
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Builds on #149