This simple crate provides integer wrappers that guarantee that they are being used in a constant-time fashion. Hence, division and direct comparison are disallowed. Using Rust's type system, this crate will help the compiler check systematically whether your cryptographic code is constant-time relative to secret inputs.
To use the crate, just import everything (use secret_integers::*;) and replace your integer types with uppercase versions of their names (e.g. u8 -> U8).
Two examples show how to use the crate : Dalek and Chacha20. To build theses examples, use
cargo build --example dalek
cargo build --example chacha20
However, if you try:
cargo build --example biguint
You will get the following error message:
error[E0599]: no method named `leading_zeros` found for type `&secret_integers::U32` in the current scope
--> examples/biguint.rs:24:46
|
24 | let zeros = self.data.last().unwrap().leading_zeros();
| ^^^^^^^^^^^^^
error[E0369]: binary operation `!=` cannot be applied to type `secret_integers::U32`
--> examples/biguint.rs:48:11
|
48 | while r != 0 {
| ^^^^^^
|
= note: an implementation of `std::cmp::PartialEq` might be missing for `secret_integers::U32`