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Merge bitcoin#470: Fix wnaf_const documentation
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768514b Fix wnaf_const documentation with respect to return value and number of words set (Jonas Nick)

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Tree-SHA512: e2e49036c5930c74fff12626957a43000e5f86180791f2b857d279e83c609663ee5cbee4c3380f3df3d29e493f40051d63a8eff1badeea99e06652d9e72f4d29
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sipa committed Aug 10, 2017
2 parents b8c26a3 + 768514b commit cac7c55
Showing 1 changed file with 4 additions and 3 deletions.
7 changes: 4 additions & 3 deletions src/ecmult_const_impl.h
Original file line number Diff line number Diff line change
Expand Up @@ -42,11 +42,12 @@
} while(0)


/** Convert a number to WNAF notation. The number becomes represented by sum(2^{wi} * wnaf[i], i=0..return_val)
* with the following guarantees:
/** Convert a number to WNAF notation.
* The number becomes represented by sum(2^{wi} * wnaf[i], i=0..WNAF_SIZE(w)+1) - return_val.
* It has the following guarantees:
* - each wnaf[i] an odd integer between -(1 << w) and (1 << w)
* - each wnaf[i] is nonzero
* - the number of words set is returned; this is always (WNAF_BITS + w - 1) / w
* - the number of words set is always WNAF_SIZE(w) + 1
*
* Adapted from `The Width-w NAF Method Provides Small Memory and Fast Elliptic Scalar
* Multiplications Secure against Side Channel Attacks`, Okeya and Tagaki. M. Joye (Ed.)
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