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ec: use x1/x2, y1/y2 variables

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No logic change, just using the variables that are defined instead of
repeating code.
This commit is contained in:
Daniel Cousens 2014-06-04 13:55:09 +10:00
parent 6020c0740d
commit e735a9182b
1 changed files with 7 additions and 7 deletions
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14
src/ec.js
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@ -117,10 +117,15 @@ function pointFpAdd(b) {
if(this.isInfinity()) return b; if(this.isInfinity()) return b;
if(b.isInfinity()) return this; if(b.isInfinity()) return this;
var x1 = this.x.toBigInteger()
var y1 = this.y.toBigInteger()
var x2 = b.x.toBigInteger()
var y2 = b.y.toBigInteger()
// u = Y2 * Z1 - Y1 * Z2 // u = Y2 * Z1 - Y1 * Z2
var u = b.y.toBigInteger().multiply(this.z).subtract(this.y.toBigInteger().multiply(b.z)).mod(this.curve.q); var u = y2.multiply(this.z).subtract(y1.multiply(b.z)).mod(this.curve.q)
// v = X2 * Z1 - X1 * Z2 // v = X2 * Z1 - X1 * Z2
var v = b.x.toBigInteger().multiply(this.z).subtract(this.x.toBigInteger().multiply(b.z)).mod(this.curve.q); var v = x2.multiply(this.z).subtract(x1.multiply(b.z)).mod(this.curve.q)
if(v.signum() === 0) { if(v.signum() === 0) {
if(u.signum() === 0) { if(u.signum() === 0) {
@ -129,11 +134,6 @@ function pointFpAdd(b) {
return this.curve.getInfinity(); // this = -b, so infinity return this.curve.getInfinity(); // this = -b, so infinity
} }
var x1 = this.x.toBigInteger();
var y1 = this.y.toBigInteger();
var x2 = b.x.toBigInteger();
var y2 = b.y.toBigInteger();
var v2 = v.square(); var v2 = v.square();
var v3 = v2.multiply(v); var v3 = v2.multiply(v);
var x1v2 = x1.multiply(v2); var x1v2 = x1.multiply(v2);