[SM9/BN256] 优化扩域上平方运算 about gmsm HOT 2 CLOSED

func (e *gfP2) SquareNC(a *gfP2) *gfP2 {
	// Complex squaring algorithm:
	// (xu+y)² = y^2-2*x^2 + 2*u*x*y
	tx := &e.x
	ty := &e.y
	
	gfpSqr(tx, &a.x, 1)
	gfpSqr(ty, &a.y, 1)
	gfpSub(ty, ty, tx)
	gfpSub(ty, ty, tx)

	gfpMul(tx, &a.x, &a.y)
	gfpAdd(tx, tx, tx)
}

func (e *gfP2) SquareNC(a *gfP2) *gfP2 {
	// Complex squaring algorithm:
	// (xu+y)² = y^2-2*x^2 + 2*u*x*y
	tx := &e.x
	ty := &e.y
	
	gfpAdd(ty, &a.x, &a.y)
	gfpAdd(tx, &a.x, &a.x)
	gfpSub(tx, &a.y, tx)
	gfpMul(ty, tx, ty)
	gfpMul(tx, &a.x, &a.y)
	gfpAdd(ty, tx, ty)
	gfpAdd(tx, tx, tx)
}