attributes=

static VALUE
ossl_x509req_set_attributes(VALUE self, VALUE ary)
{
    X509_REQ *req;
    X509_ATTRIBUTE *attr;
    long i;
    VALUE item;

    Check_Type(ary, T_ARRAY);
    for (i=0;i<RARRAY_LEN(ary); i++) {
        OSSL_Check_Kind(RARRAY_AREF(ary, i), cX509Attr);
    }
    GetX509Req(self, req);
    while ((attr = X509_REQ_delete_attr(req, 0)))
        X509_ATTRIBUTE_free(attr);
    for (i=0;i<RARRAY_LEN(ary); i++) {
        item = RARRAY_AREF(ary, i);
        attr = GetX509AttrPtr(item);
        if (!X509_REQ_add1_attr(req, attr)) {
            ossl_raise(eX509ReqError, NULL);
        }
    }
    return ary;
}