Trait subtle_ng::ConstantTimeEq [−][src]
Expand description
An Eq
-like trait that produces a Choice
instead of a bool
.
Example
use subtle_ng::ConstantTimeEq;
let x: u8 = 5;
let y: u8 = 13;
assert_eq!(x.ct_eq(&y).unwrap_u8(), 0);
assert_eq!(x.ct_eq(&x).unwrap_u8(), 1);
Required methods
Implementations on Foreign Types
Check whether two slices of ConstantTimeEq
types are equal.
Note
This function short-circuits if the lengths of the input slices are different. Otherwise, it should execute in time independent of the slice contents.
Since arrays coerce to slices, this function works with fixed-size arrays:
let a: [u8; 8] = [0,1,2,3,4,5,6,7];
let b: [u8; 8] = [0,1,2,3,0,1,2,3];
let a_eq_a = a.ct_eq(&a);
let a_eq_b = a.ct_eq(&b);
assert_eq!(a_eq_a.unwrap_u8(), 1);
assert_eq!(a_eq_b.unwrap_u8(), 0);