multiexp: fix maxscalar off by one

Reported by QuarksLab.
2018-07-25 21:56:39 +01:00 · 2018-07-25 21:56:39 +01:00 · a129bbd944
parent 7ed496cc78
commit a129bbd944
1 changed files with 1 additions and 1 deletions
--- a/src/ringct/multiexp.cc
+++ b/src/ringct/multiexp.cc
@ -605,7 +605,7 @@ rct::key pippenger(const std::vector<MultiexpData> &data, const std::shared_ptr<
      maxscalar = data[i].scalar;
  }
  size_t groups = 0;
-  while (groups < 256 && pow2(groups) < maxscalar)
+  while (groups < 256 && !(maxscalar < pow2(groups)))
    ++groups;
  groups = (groups + c - 1) / c;