ec: define on use

src/ec.js

@@ -95,11 +95,13 @@ function pointFpEquals(other) {
   if (other.isInfinity()) return this.isInfinity()
 
   // u = Y2 * Z1 - Y1 * Z2
-  u = other.y.toBigInteger().multiply(this.z).subtract(this.y.toBigInteger().multiply(other.z)).mod(this.curve.q)
+  var u = other.y.toBigInteger().multiply(this.z).subtract(this.y.toBigInteger().multiply(other.z)).mod(this.curve.q)
+
   if (u.signum() !== 0) return false
 
   // v = X2 * Z1 - X1 * Z2
-  v = other.x.toBigInteger().multiply(this.z).subtract(this.x.toBigInteger().multiply(other.z)).mod(this.curve.q)
+  var v = other.x.toBigInteger().multiply(this.z).subtract(this.x.toBigInteger().multiply(other.z)).mod(this.curve.q)
+
   return v.signum() === 0
 }