generic_array/ext_impls/
impl_subtle.rs

1use subtle::{ConditionallySelectable, ConstantTimeEq};
2
3use crate::{ArrayLength, GenericArray};
4
5impl<T, N: ArrayLength> ConstantTimeEq for GenericArray<T, N>
6where
7    T: ConstantTimeEq,
8{
9    #[inline]
10    fn ct_eq(&self, other: &Self) -> subtle::Choice {
11        self.as_slice().ct_eq(other.as_slice())
12    }
13}
14
15impl<T, N: ArrayLength> ConditionallySelectable for GenericArray<T, N>
16where
17    GenericArray<T, N>: Copy,
18    T: ConditionallySelectable,
19{
20    #[inline]
21    fn conditional_select(a: &Self, b: &Self, choice: subtle::Choice) -> Self {
22        let mut out = *a;
23        out.conditional_assign(b, choice);
24        out
25    }
26
27    #[inline]
28    fn conditional_assign(&mut self, other: &Self, choice: subtle::Choice) {
29        for (a, b) in self.iter_mut().zip(other.iter()) {
30            a.conditional_assign(b, choice);
31        }
32    }
33}