Simple homomorphic encrypted integer idea

hme_int.rs

use rand_core::RngCore;

pub struct Key(i64);

pub struct Secret(i64);

impl Secret {
    pub fn new<R: RngCore>(rng: &mut R, value: i64) -> (Key, Self) {
        let key = rng.next_u64() as i64;
        (Key(key), Self(key.wrapping_add(value)))
    }
    pub fn renew<R: RngCore>(self, rng: &mut R, key: Key) -> (Key, Self) {
        Secret::new(rng, self.reveal(key))
    }
    pub fn add(self, n: i64) -> Self {
        Self(self.0.wrapping_add(n))
    }
    pub fn reveal(self, key: Key) -> i64 {
        self.0.wrapping_sub(key.0)
    }
}