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Merge #470: Fix wnaf_const documentation 

768514b Fix wnaf_const documentation with respect to return value and number of words set (Jonas Nick)

Pull request description:

Tree-SHA512: e2e49036c5930c74fff12626957a43000e5f86180791f2b857d279e83c609663ee5cbee4c3380f3df3d29e493f40051d63a8eff1badeea99e06652d9e72f4d29
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Pieter Wuille 2017-08-10 16:27:38 -07:00
parent b8c26a3990 768514bac0
commit cac7c5559d
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1 changed files with 4 additions and 3 deletions
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7
src/ecmult_const_impl.h
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@ -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.)