Class ECPoint

modules/crypt/arith/ecp.js:40–85

import Modular from "modular";

export default class ECPoint {
	constructor(x, y, identity = false) {
		this.x = x;
		this.y = y;
		this.z = identity ? 0n : 1n;
	};
	get X() {
		return this.x;
	}
	get Y() {
		return this.y;
	}
	set X(x) {
		this.x = x;
	}
	set Y(y) {
		this.y = y;
	}
	isZero() {
		return this.z == 0n;
	};
	toString() {
//		this.norm();
		if (this.isZero())
			return "0"
		else
			return this.x + "," + this.y + "," + this.z;
	}
	static serialize(o) {
		o.toString();
	};
	static parse(txt) {
		let a = txt.split(",");
		if (3 === a.length) {
			return new ECPoint(a[0], a[1], a[2]);
		}
	};
	static fromOctetString(os) {
		if (os[0] != 0x04)
			throw new Error("unsupported format");
		let flen = (os.length - 1) >> 1;
		let x = BigInt.fromArrayBuffer(os.slice(1, 1 + flen).buffer);
		let y = BigInt.fromArrayBuffer(os.slice(1 + flen, os.length).buffer);
		return new ECPoint(x, y);
	}
};

Object.freeze(ECPoint.prototype);