Trait ConstantTimeLess

pub trait ConstantTimeLess: ConstantTimeEq + ConstantTimeGreater {
    // Provided method
    fn ct_lt(&self, other: &Self) -> Choice { ... }
}

A type which can be compared in some manner and be determined to be less than another of the same type.

Provided Methods

fn ct_lt(&self, other: &Self) -> Choice

Determine whether self < other.

The bitwise-NOT of the return value of this function should be usable to determine if self >= other.

A default implementation is provided and implemented for the unsigned integer types.

This function should execute in constant time.

Returns

A Choice with a set bit if self < other, and with no set bits otherwise.

Example

use subtle_ng::ConstantTimeLess;

let x: u8 = 13;
let y: u8 = 42;

let x_lt_y = x.ct_lt(&y);

assert_eq!(x_lt_y.unwrap_u8(), 1);

let y_lt_x = y.ct_lt(&x);

assert_eq!(y_lt_x.unwrap_u8(), 0);

let x_lt_x = x.ct_lt(&x);

assert_eq!(x_lt_x.unwrap_u8(), 0);

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementations on Foreign Types

impl ConstantTimeLess for u8

impl ConstantTimeLess for u16

impl ConstantTimeLess for u32

impl ConstantTimeLess for u64

impl ConstantTimeLess for u128

Implementors