Problematic blinding in RSA

[Fethbita]

Currently, the blind function performs the following lines:

    let mut r: BoxedUint = BoxedUint::one_with_precision(bits);
    let mut ir: Option<BoxedUint> = None;
    while ir.is_none() {
        r = BoxedUint::try_random_mod_vartime(rng, key.n()).map_err(|_| Error::Rng)?;
        if r.is_zero().into() {
            r = BoxedUint::one_with_precision(bits);
        }

        // r^-1 (mod n)
        ir = r.invert_mod(key.n()).into();
    }

However this loop will never run multiple times because r is set to 1, instead of being set to 0 so that the invert_mod would fail. My suggestion is to set r to 0 and remove the if conditional, then the loop would go on until a proper value is found.