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ec: extract BigInteger constants

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Daniel Cousens 2014-05-17 11:56:33 +10:00
parent d9ce4bee6b
commit 1e54c521d5
1 changed files with 11 additions and 11 deletions
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22
src/ec.js
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@ -5,6 +5,11 @@
var assert = require('assert') var assert = require('assert')
var BigInteger = require('bigi') var BigInteger = require('bigi')
// constants
var TWO = BigInteger.valueOf(2)
var THREE = BigInteger.valueOf(3)
var SEVEN = BigInteger.valueOf(7)
function ECFieldElementFp(q,x) { function ECFieldElementFp(q,x) {
this.x = x; this.x = x;
// TODO if(x.compareTo(q) >= 0) error // TODO if(x.compareTo(q) >= 0) error
@ -125,7 +130,6 @@ function pointFpAdd(b) {
return this.curve.getInfinity(); // this = -b, so infinity return this.curve.getInfinity(); // this = -b, so infinity
} }
var THREE = new BigInteger("3");
var x1 = this.x.toBigInteger(); var x1 = this.x.toBigInteger();
var y1 = this.y.toBigInteger(); var y1 = this.y.toBigInteger();
var x2 = b.x.toBigInteger(); var x2 = b.x.toBigInteger();
@ -150,8 +154,6 @@ function pointFpTwice() {
if(this.isInfinity()) return this; if(this.isInfinity()) return this;
if(this.y.toBigInteger().signum() === 0) return this.curve.getInfinity(); if(this.y.toBigInteger().signum() === 0) return this.curve.getInfinity();
// TODO: optimized handling of constants
var THREE = new BigInteger("3");
var x1 = this.x.toBigInteger(); var x1 = this.x.toBigInteger();
var y1 = this.y.toBigInteger(); var y1 = this.y.toBigInteger();
@ -182,7 +184,7 @@ function pointFpMultiply(k) {
if(k.signum() === 0) return this.curve.getInfinity() if(k.signum() === 0) return this.curve.getInfinity()
var e = k; var e = k;
var h = e.multiply(new BigInteger("3")); var h = e.multiply(THREE)
var neg = this.negate(); var neg = this.negate();
var R = this; var R = this;
@ -327,8 +329,6 @@ ECPointFp.prototype.getEncoded = function(compressed) {
return buffer return buffer
} }
var SEVEN = BigInteger.valueOf(7)
ECPointFp.decodeFrom = function (curve, buffer) { ECPointFp.decodeFrom = function (curve, buffer) {
var type = buffer.readUInt8(0) var type = buffer.readUInt8(0)
var compressed = type !== 0x04 var compressed = type !== 0x04
@ -398,11 +398,11 @@ ECPointFp.prototype.twice2D = function () {
return this.curve.getInfinity(); return this.curve.getInfinity();
} }
var TWO = this.curve.fromBigInteger(BigInteger.valueOf(2)); var FpTWO = this.curve.fromBigInteger(TWO);
var THREE = this.curve.fromBigInteger(BigInteger.valueOf(3)); var FpTHREE = this.curve.fromBigInteger(THREE)
var gamma = this.x.square().multiply(THREE).add(this.curve.a).divide(this.y.multiply(TWO)); var gamma = this.x.square().multiply(FpTHREE).add(this.curve.a).divide(this.y.multiply(FpTWO));
var x3 = gamma.square().subtract(this.x.multiply(TWO)); var x3 = gamma.square().subtract(this.x.multiply(FpTWO));
var y3 = gamma.multiply(this.x.subtract(x3)).subtract(this.y); var y3 = gamma.multiply(this.x.subtract(x3)).subtract(this.y);
return new ECPointFp(this.curve, x3, y3); return new ECPointFp(this.curve, x3, y3);
@ -413,7 +413,7 @@ ECPointFp.prototype.multiply2D = function (k) {
if (k.signum() === 0) return this.curve.getInfinity() if (k.signum() === 0) return this.curve.getInfinity()
var e = k; var e = k;
var h = e.multiply(new BigInteger("3")); var h = e.multiply(THREE)
var neg = this.negate(); var neg = this.negate();
var R = this; var R = this;