51 lines
1.4 KiB
JavaScript
51 lines
1.4 KiB
JavaScript
var bn = require('./bn');
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var elliptic = require('elliptic');
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var ec = elliptic.curves.secp256k1;
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var ecpoint = ec.curve.point.bind(ec.curve)
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var p = ec.curve.point();
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var Curve = Object.getPrototypeOf(ec.curve);
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var Point = function Point(x, y, isRed) {
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return ecpoint(x, y, isRed);
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};
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Point.prototype = Object.getPrototypeOf(p);
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Point.fromX = ec.curve.pointFromX.bind(ec.curve);
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Point.getG = function() {
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var p = Point(ec.curve.g.getX(), ec.curve.g.getY());
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return p;
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};
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Point.getN = function() {
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return bn(ec.curve.n.toArray());
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};
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Point.prototype._getX = Point.prototype.getX;
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Point.prototype.getX = function() {
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var n = bn(this._getX().toArray());
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return bn(this._getX().toArray());
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};
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Point.prototype._getY = Point.prototype.getY;
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Point.prototype.getY = function() {
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return bn(this._getY().toArray());
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};
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//https://www.iacr.org/archive/pkc2003/25670211/25670211.pdf
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Point.prototype.validate = function() {
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var p2 = Point.fromX(this.getY().isOdd(), this.getX());
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if (!(p2.y.cmp(this.y) === 0))
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throw new Error('Invalid y value of public key');
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if (!(this.getX().gt(-1) && this.getX().lt(Point.getN()))
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||!(this.getY().gt(-1) && this.getY().lt(Point.getN())))
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throw new Error('Point does not lie on the curve');
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if (!(this.mul(Point.getN()).isInfinity()))
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throw new Error('Point times N must be infinity');
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return this;
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};
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module.exports = Point;
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