util

func Add(x, y *big.Int) *big.Int

func And(x, y *big.Int) *big.Int

func IsEcPointInfinity(x, y *big.Int) bool

func Lsh(x *big.Int, n uint) *big.Int

func Mod(x, y *big.Int) *big.Int

func ModInverse(x, y *big.Int) *big.Int

func Mul(x, y *big.Int) *big.Int

func PKCS5Padding(src []byte, blockSize int) []byte

func PKCS5UnPadding(src []byte) []byte

func SetBit(x *big.Int, i int, b uint) *big.Int

func Sub(x, y *big.Int) *big.Int

func ZForAffine(x, y *big.Int) *big.Int