}
		paramsDer := cryptobyte.String(params.FullBytes)
		if !paramsDer.ReadASN1(&paramsDer, cryptobyte_asn1.SEQUENCE) ||
			!paramsDer.ReadASN1Integer(pub.Parameters.P) ||
			!paramsDer.ReadASN1Integer(pub.Parameters.Q) ||
			!paramsDer.ReadASN1Integer(pub.Parameters.G) {
			return nil, errors.New("x509: invalid DSA parameters")
		}
		if pub.Y.Sign() <= 0 || pub.Parameters.P.Sign() <= 0 ||

	}

	r, s = new(big.Int), new(big.Int)
	var inner cryptobyte.String
	input := cryptobyte.String(sig)
	if !input.ReadASN1(&inner, asn1.SEQUENCE) ||
		!input.Empty() ||
		!inner.ReadASN1Integer(r) ||
		!inner.ReadASN1Integer(s) ||
		!inner.Empty() {
		return nil, nil, errors.New("invalid ASN.1 from SignASN1")
	}
	return r, s, nil
}

// no leading zeroes, and zero will be returned as a single zero byte.
// ReadASN1Integer reports whether the read was successful.
func (s *String) ReadASN1Integer(out interface{}) bool {
	switch out := out.(type) {
	case *int, *int8, *int16, *int32, *int64:
		var i int64
		if !s.readASN1Int64(&i) || reflect.ValueOf(out).Elem().OverflowInt(i) {
			return false
		}

func parseSignature(sig []byte) (r, s []byte, err error) {
	var inner cryptobyte.String
	input := cryptobyte.String(sig)
	if !input.ReadASN1(&inner, asn1.SEQUENCE) ||
		!input.Empty() ||
		!inner.ReadASN1Integer(&r) ||
		!inner.ReadASN1Integer(&s) ||
		!inner.Empty() {
		return nil, nil, errors.New("invalid ASN.1")
	}
	return r, s, nil
}

type nistCurve[Point nistPoint[Point]] struct {
	newPoint func() Point