lib/hdkey: fixes condition for BIP consistency. Closes #1

lib/hdkey.js

@@ -143,7 +143,7 @@ HDKey.prototype.deriveChild = function (index) {
     var Ki = curve.G.multiply(pIL).add(this._publicPoint)
 
     // In case parse256(IL) >= n or Ki is the point at infinity, one should proceed with the next value for i
-    if (curve.isInfinity(Ki)) {
+    if (pIL.compareTo(curve.n) >= 0 || curve.isInfinity(Ki)) {
       return this.derive(index + 1)
     }