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feat: Use core::hint::black_box in rosenpass_constant_time::xor

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Karolin Varner
2024-01-20 13:39:00 +01:00
committed by Karolin Varner
parent b6203683fc
commit 2fa0a2a72a
1 changed files with 4 additions and 2 deletions
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6
constant-time/src/lib.rs
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@@ -1,3 +1,5 @@
use core::hint::black_box;
use rosenpass_to::{with_destination, To}; use rosenpass_to::{with_destination, To};
/// Xors the source into the destination /// Xors the source into the destination
@@ -18,9 +20,9 @@ use rosenpass_to::{with_destination, To};
#[inline] #[inline]
pub fn xor(src: &[u8]) -> impl To<[u8], ()> + '_ { pub fn xor(src: &[u8]) -> impl To<[u8], ()> + '_ {
with_destination(|dst: &mut [u8]| { with_destination(|dst: &mut [u8]| {
assert!(src.len() == dst.len()); assert!(black_box(src.len()) == black_box(dst.len()));
for (dv, sv) in dst.iter_mut().zip(src.iter()) { for (dv, sv) in dst.iter_mut().zip(src.iter()) {
*dv ^= *sv; *black_box(dv) ^= black_box(*sv);
} }
}) })
} }