Trait subtle::ConditionallyAssignable
[−]
[src]
pub trait ConditionallyAssignable {
fn conditional_assign(&mut self, other: &Self, choice: Mask);
}Trait for items which can be conditionally assigned in constant time.
Required Methods
fn conditional_assign(&mut self, other: &Self, choice: Mask)
Conditionally assign other to self in constant time.
If choice == 1, assign other to self. Otherwise, leave self
unchanged.
Examples
Several implementations of constant-time conditional assignment are
provided within subtle.
Integer Types
This crate includes implementations of ConditionallyAssignable for the
following integer types:
u8,u16,u32,u64,i8,i16,i32, andi64.
let mut x: u8 = 13; let y: u8 = 42; x.conditional_assign(&y, 0); assert_eq!(x, 13); x.conditional_assign(&y, 1); assert_eq!(x, 42);
If you need conditional assignment for u128 ori128 on Rust nightly,
these definitions are provided if you compile subtle with the
nightly feature:
⚠Be careful when using this code, it's not being tested!
[dependencies.subtle] features = ["nightly"]
Integer Arrays
Additionally, subtle provides implementations of conditional
assignment for fixed-size arrays (between [1, 32] elements in length,
inclusive) of integers (for the integer types listed above):
let mut x: [u32; 17] = [13; 17]; let y: [u32; 17] = [42; 17]; x.conditional_assign(&y, 0); assert_eq!(x, [13; 17]); x.conditional_assign(&y, 1); assert_eq!(x, [42; 17]);
If you need conditional assignment for u128 ori128 on Rust nightly,
these definitions are provided if you compile subtle with the
nightly feature (as above).