Function sm2P256ToBig

sm2/p256.go:1043–1058

X = r * R mod P r = X * R' mod P

(X *sm2P256FieldElement)

// X = r * R mod P
// r = X * R' mod P
func sm2P256ToBig(X *sm2P256FieldElement) *big.Int {
	r, tm := new(big.Int), new(big.Int)
	r.SetInt64(int64(X[8]))
	for i := 7; i >= 0; i-- {
		if (i & 1) == 0 {
			r.Lsh(r, 29)
		} else {
			r.Lsh(r, 28)
		}
		tm.SetInt64(int64(X[i]))
		r.Add(r, tm)
	}
	r.Mul(r, sm2P256.RInverse)
	r.Mod(r, sm2P256.P)
	return r
}
func WNafReversed(wnaf []int8) []int8 {
	wnafRev := make([]int8, len(wnaf), len(wnaf))
	for i, v := range wnaf {