How to use the ecc-jsbn/lib/ec.ECCurveFp function in ecc-jsbn

function publicFromPrivateECDSA(curveName, priv) {
	assert.string(curveName, 'curveName');
	assert.buffer(priv);
	var params = algs.curves[curveName];
	var p = new jsbn(params.p);
	var a = new jsbn(params.a);
	var b = new jsbn(params.b);
	var curve = new ec.ECCurveFp(p, a, b);
	var G = curve.decodePointHex(params.G.toString('hex'));

	var d = new jsbn(mpNormalize(priv));
	var pub = G.multiply(d);
	pub = Buffer.from(curve.encodePointHex(pub), 'hex');

	var parts = [];
	parts.push({name: 'curve', data: Buffer.from(curveName)});
	parts.push({name: 'Q', data: pub});

	var key = new Key({type: 'ecdsa', curve: curve, parts: parts});
	return (key);
}

function X9ECParameters(name) {
	var params = algs.curves[name];
	assert.object(params);

	var p = new jsbn(params.p);
	var a = new jsbn(params.a);
	var b = new jsbn(params.b);
	var n = new jsbn(params.n);
	var h = jsbn.ONE;
	var curve = new ec.ECCurveFp(p, a, b);
	var G = curve.decodePointHex(params.G.toString('hex'));

	this.curve = curve;
	this.g = G;
	this.n = n;
	this.h = h;
}
X9ECParameters.prototype.getCurve = function () { return (this.curve); };