Trait hdk::prelude::dependencies::subtle::ConstantTimeLess [−][src]
pub trait ConstantTimeLess: ConstantTimeEq + ConstantTimeGreater {
fn ct_lt(&self, other: &Self) -> Choice { ... }
}Expand description
A type which can be compared in some manner and be determined to be less than another of the same type.
Provided methods
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::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);