balaji marisetti <[email protected]>:
> In the EC_METHOD structure, the pointers to methods for converting > between affine and projective coordinates are named: > > `point_set_Jprojective_coordinates_GFp` and > `point_get_Jprojective_coordinates_GFp` > > Does that mean any implementation of EC_METHOD (for prime curves) can > only use Jacobian coordinates? Is it not possible to use some other > coordinate system (may be homogeneous)? This method name just means that the EC_METHOD implementation should support setting points based on Jacobian coordinates. Internally, it might convert them to something else. (Or, the EC_METHOD could entirely omit support for this method. Typical usage of the ECC library won't depend on this.) Bodo
