ec_field_element_equal
int ec_field_element_equal(const EC_FIELD_MODULUS *fm, const EC_FIELD_ELEMENT *a,
return ec_field_element_equal(&group->fm, &y2z, &sum) |
return 1 - (ec_field_element_equal(&group->fm, &ax, &bx) &
ec_field_element_equal(&group->fm, &ay, &by));