}

func verifyLegacy(pub *PublicKey, hash []byte, sig []byte) bool {
	rBytes, sBytes, err := parseSignature(sig)
	if err != nil {
		return false
	}
	r, s := new(big.Int).SetBytes(rBytes), new(big.Int).SetBytes(sBytes)

	c := pub.Curve
	N := c.Params().N

	if r.Sign() <= 0 || s.Sign() <= 0 {
		return false
	}
	if r.Cmp(N) >= 0 || s.Cmp(N) >= 0 {
		return false
	}

	}
	if boring.Enabled {
		bk, err := boring.NewPublicKeyECDH(c.name, k.publicKey)
		if err != nil {
			return nil, err
		}
		k.boring = bk
	} else {
		// SetBytes also checks that the point is on the curve.
		if _, err := c.newPoint().SetBytes(key); err != nil {
			return nil, err
		}
	}
	return k, nil
}

func (c *nistCurve[Point]) ecdh(local *PrivateKey, remote *PublicKey) ([]byte, error) {

		b.Run(fmt.Sprintf("%v", size), func(b *testing.B) {
			b.SetBytes(int64(size))
			for i := 0; i < b.N; i++ {
				Decode(sink, src)
			}
		})
	}
}

func BenchmarkDecodeString(b *testing.B) {
	for _, size := range []int{256, 1024, 4096, 16384} {
		src := strings.Repeat("2b744faa", size/8)
		b.Run(fmt.Sprintf("%v", size), func(b *testing.B) {
			b.SetBytes(int64(size))
			for i := 0; i < b.N; i++ {

		return errors.New("Rat.GobDecode: invalid length")
	}
	i := j + int(ln)
	if len(buf) < i {
		return errors.New("Rat.GobDecode: buffer too small")
	}
	z.a.neg = b&1 != 0
	z.a.abs = z.a.abs.setBytes(buf[j:i])
	z.b.abs = z.b.abs.setBytes(buf[i:])
	return nil
}

// MarshalText implements the [encoding.TextMarshaler] interface.
func (x *Rat) MarshalText() (text []byte, err error) {
	if x.IsInt() {
		return x.a.MarshalText()
	}

	}

	benchmarkEncrypt := func(size int, b *testing.B) {
		var (
			data      = make([]byte, size)
			plaintext = bytes.NewReader(data)
			context   = kms.Context{"key": "value"}
		)
		b.SetBytes(int64(size))
		for i := 0; i < b.N; i++ {
			ciphertext, err := Encrypt(KMS, plaintext, context)
			if err != nil {
				b.Fatal(err)
			}
			if _, err = io.Copy(io.Discard, ciphertext); err != nil {

	if z.form == finite {
		if len(buf) < 10 {
			return errors.New("Float.GobDecode: buffer too small for finite form float")
		}
		z.exp = int32(byteorder.BeUint32(buf[6:]))
		z.mant = z.mant.setBytes(buf[10:])
	}

	if oldPrec != 0 {
		z.mode = oldMode
		z.SetPrec(uint(oldPrec))
	}

	if msg := z.validate0(); msg != "" {
		return errors.New("Float.GobDecode: " + msg)
	}

	return nil