oid

static VALUE
ossl_asn1obj_get_oid(VALUE self)
{
    VALUE val;
    ASN1_OBJECT *a1obj;
    char buf[128];

    val = ossl_asn1_get_value(self);
    a1obj = obj_to_asn1obj(val);
    OBJ_obj2txt(buf, sizeof(buf), a1obj, 1);
    ASN1_OBJECT_free(a1obj);

    return rb_str_new2(buf);
}