ec: white space fixes

It is advised to use ?w=0 in comparing this commit.

src/ec.js

@@ -10,12 +10,12 @@ var THREE = BigInteger.valueOf(3)
 
 function ECFieldElementFp(q,x) {
   this.x = x;
-    // TODO if(x.compareTo(q) >= 0) error
+  // TODO if (x.compareTo(q) >= 0) error
   this.q = q;
 }
 
 function feFpEquals(other) {
-    if(other == this) return true;
+  if (other == this) return true;
   return (this.q.equals(other.q) && this.x.equals(other.x));
 }
 
@@ -66,7 +66,7 @@ function ECPointFp(curve,x,y,z) {
   this.y = y;
   // Projective coordinates: either zinv == null or z * zinv == 1
   // z and zinv are just BigIntegers, not fieldElements
-    if(z == null) {
+  if (z == null) {
     this.z = BigInteger.ONE;
   }
   else {
@@ -77,23 +77,24 @@ function ECPointFp(curve,x,y,z) {
 }
 
 function pointFpGetX() {
-    if(this.zinv == null) {
+  if (this.zinv == null) {
     this.zinv = this.z.modInverse(this.curve.q);
   }
   return this.curve.fromBigInteger(this.x.toBigInteger().multiply(this.zinv).mod(this.curve.q));
 }
 
 function pointFpGetY() {
-    if(this.zinv == null) {
+  if (this.zinv == null) {
     this.zinv = this.z.modInverse(this.curve.q);
   }
   return this.curve.fromBigInteger(this.y.toBigInteger().multiply(this.zinv).mod(this.curve.q));
 }
 
 function pointFpEquals(other) {
-    if(other == this) return true;
-    if(this.isInfinity()) return other.isInfinity();
-    if(other.isInfinity()) return this.isInfinity();
+  if (other == this) return true;
+  if (this.isInfinity()) return other.isInfinity();
+  if (other.isInfinity()) return this.isInfinity();
+
   var u, v;
   // u = Y2 * Z1 - Y1 * Z2
   u = other.y.toBigInteger().multiply(this.z).subtract(this.y.toBigInteger().multiply(other.z)).mod(this.curve.q);
@@ -113,8 +114,8 @@ function pointFpNegate() {
 }
 
 function pointFpAdd(b) {
-    if(this.isInfinity()) return b;
-    if(b.isInfinity()) return this;
+  if (this.isInfinity()) return b;
+  if (b.isInfinity()) return this;
 
   var x1 = this.x.toBigInteger()
   var y1 = this.y.toBigInteger()
@@ -126,10 +127,11 @@ function pointFpAdd(b) {
   // v = X2 * Z1 - X1 * Z2
   var v = x2.multiply(this.z).subtract(x1.multiply(b.z)).mod(this.curve.q)
 
-    if(v.signum() === 0) {
-        if(u.signum() === 0) {
+  if (v.signum() === 0) {
+      if (u.signum() === 0) {
           return this.twice(); // this == b, so double
       }
+
       return this.curve.getInfinity(); // this = -b, so infinity
   }
 
@@ -149,8 +151,8 @@ function pointFpAdd(b) {
 }
 
 function pointFpTwice() {
-    if(this.isInfinity()) return this;
-    if(this.y.toBigInteger().signum() === 0) return this.curve.getInfinity();
+  if (this.isInfinity()) return this;
+  if (this.y.toBigInteger().signum() === 0) return this.curve.getInfinity();
 
   var x1 = this.x.toBigInteger();
   var y1 = this.y.toBigInteger();
@@ -161,9 +163,11 @@ function pointFpTwice() {
 
   // w = 3 * x1^2 + a * z1^2
   var w = x1.square().multiply(THREE);
-    if(a.signum() !== 0) {
+
+  if (a.signum() !== 0) {
     w = w.add(this.z.square().multiply(a));
   }
+
   w = w.mod(this.curve.q);
   // x3 = 2 * y1 * z1 * (w^2 - 8 * x1 * y1^2 * z1)
   var x3 = w.square().subtract(x1.shiftLeft(3).multiply(y1sqz1)).shiftLeft(1).multiply(y1z1).mod(this.curve.q);
@@ -178,8 +182,8 @@ function pointFpTwice() {
 // Simple NAF (Non-Adjacent Form) multiplication algorithm
 // TODO: modularize the multiplication algorithm
 function pointFpMultiply(k) {
-    if(this.isInfinity()) return this;
-    if(k.signum() === 0) return this.curve.getInfinity()
+  if (this.isInfinity()) return this;
+  if (k.signum() === 0) return this.curve.getInfinity()
 
   var e = k;
   var h = e.multiply(THREE)
@@ -205,7 +209,8 @@ function pointFpMultiply(k) {
 // Compute this*j + x*k (simultaneous multiplication)
 function pointFpMultiplyTwo(j,x,k) {
   var i;
-  if(j.bitLength() > k.bitLength())
+
+  if (j.bitLength() > k.bitLength())
     i = j.bitLength() - 1;
   else
     i = k.bitLength() - 1;
@@ -214,8 +219,8 @@ function pointFpMultiplyTwo(j,x,k) {
   var both = this.add(x);
   while(i >= 0) {
     R = R.twice();
-    if(j.testBit(i)) {
-      if(k.testBit(i)) {
+    if (j.testBit(i)) {
+      if (k.testBit(i)) {
         R = R.add(both);
       }
       else {
@@ -223,7 +228,7 @@ function pointFpMultiplyTwo(j,x,k) {
       }
     }
     else {
-      if(k.testBit(i)) {
+      if (k.testBit(i)) {
         R = R.add(x);
       }
     }
@@ -267,7 +272,7 @@ function curveFpGetB() {
 }
 
 function curveFpEquals(other) {
-    if(other == this) return true;
+  if (other == this) return true;
   return(this.q.equals(other.q) && this.a.equals(other.a) && this.b.equals(other.b));
 }
 
@@ -410,6 +415,5 @@ ECPointFp.prototype.validate = function () {
   return true;
 };
 
-
 module.exports = ECCurveFp;
 module.exports.ECPointFp = ECPointFp;