from ecp_curves.c:658
#define LOAD_GROUP( G ) ecp_group_load( grp, \
G ## _p, sizeof( G ## _p ), \
NULL, 0, \
G ## _b, sizeof( G ## _b ), \
G ## _gx, sizeof( G ## _gx ), \
G ## _gy, sizeof( G ## _gy ), \
G ## _n, sizeof( G ## _n ) )