Assume all the values and operations defined over $\mathbb{F}_p$. For the sake of simplicity assume all the values are non-zero. Let $(-r)$ denote additive inverse of value $r$.
We have one fixed value $a$. we compute $v_1=a+r_1$ and $v_2=(-r_1)+r_2$, where $r_i$ are picked uniformly at random from the field.
We give $v_1$ and $v_2$ to a semi-honest adversary and ask him to do:
$v_1+v_2=a+r_2$
Question: Given $v_1$ and $v_2$ can the adversary learn anything about $a$ in above scenario (when it performs modular addition operation)?