Merge pull request #99 from LeJamon/main

Noble-ed25519, does not handle the point at infinity in the toAffine method

index.js

@@ -129,8 +129,8 @@ class Point {
     }
     toAffine() {
         const { ex: x, ey: y, ez: z } = this; // (x, y, z, t) ∋ (x=x/z, y=y/z, t=xy)
-        if (this.is0())
-            return { x: 0n, y: 0n }; // fast-path for zero point
+        if (this.equals(I))
+            return { x: 0n, y: 1n }; // fast-path for zero point
         const iz = invert(z); // z^-1: invert z
         if (mod(z * iz) !== 1n)
             err('invalid inverse'); // (z * z^-1) must be 1, otherwise bad math

index.ts

@@ -99,7 +99,7 @@ class Point {                                           // Point in xyzt extende
   }
   toAffine(): AffinePoint {                             // converts point to 2d xy affine point
     const { ex: x, ey: y, ez: z } = this;               // (x, y, z, t) ∋ (x=x/z, y=y/z, t=xy)
-    if (this.is0()) return { x: 0n, y: 0n };            // fast-path for zero point
+    if (this.equals(I)) return { x: 0n, y: 1n };        // fast-path for zero point
     const iz = invert(z);                               // z^-1: invert z
     if (mod(z * iz) !== 1n) err('invalid inverse');     // (z * z^-1) must be 1, otherwise bad math
     return { x: mod(x * iz), y: mod(y * iz) }           // x = x*z^-1; y = y*z^-1