if !curve.IsOnCurve(x, y) {
		panic("crypto/elliptic: attempted operation on invalid point")
	}
}

var initonce sync.Once

func initAll() {
	initP224()
	initP256()
	initP384()
	initP521()
}

// P224 returns a [Curve] which implements NIST P-224 (FIPS 186-3, section D.2.2),
// also known as secp224r1. The CurveParams.Name of this [Curve] is "P-224".
//