"13b5f0b8c00a60b1ce1d7e819d7a431d7c90ea0e5f"),
	}
}

var p521 = &nistCurve[*nistec.P521Point]{
	newPoint: nistec.NewP521Point,
}

func initP521() {
	p521.params = &CurveParams{
		Name:    "P-521",
		BitSize: 521,
		// FIPS 186-4, section D.1.2.5
		P: bigFromDecimal("68647976601306097149819007990813932172694353001433" +

	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".
//