specified. EC_GROUP_get_seed_len returns the length of the seed or 0 if the seed is not specified.
EC_GROUP_set_seed returns the length of the seed that has been set. If the supplied seed is NULL, or the supplied seed length is
-0, the the return value will be 1. On error 0 is returned.
+0, the return value will be 1. On error 0 is returned.
EC_GROUP_cmp returns 0 if the curves are equal, 1 if they are not equal, or -1 on error.