Merge pull request #161 from viaNull/fix/check_nPoints

Update engine_multiexp.js , check if nPoints == 0

src/engine_multiexp.js

@@ -110,6 +110,7 @@ export default function buildMultiexp(curve, groupName) {
         }
 
         const nPoints = Math.floor(buffBases.byteLength / sGIn);
+        if (nPoints == 0) return G.zero;
         const sScalar = Math.floor(buffScalars.byteLength / nPoints);
         if( sScalar * nPoints != buffScalars.byteLength) {
             throw new Error("Scalar size does not match");