The long name of the ObjectId, as defined in openssl/objects.h.
static VALUE
ossl_asn1obj_get_ln(VALUE self)
{
VALUE val, ret = Qnil;
int nid;
val = ossl_asn1_get_value(self);
if ((nid = OBJ_txt2nid(StringValuePtr(val))) != NID_undef)
ret = rb_str_new2(OBJ_nid2ln(nid));
return ret;
}