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ascon: use chunks_exact for decoding permutation input (#47)

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Tony Arcieri 2023-02-28 14:09:08 -07:00 committed by GitHub
parent a3906aab48
commit 17519f46c6
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1 changed files with 9 additions and 3 deletions
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12
ascon/src/lib.rs
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@ -105,14 +105,20 @@ impl<const A: usize, const B: usize> Ascon<A, B> {
}
/// Ascon permutation.
// TODO(tarcieri): change `s` to `&mut [u8; 40]`
fn permutation(s: &mut [u8], start: usize, rounds: usize) {
let mut x = [0; 5];
let mut t = [0; 5];
assert_eq!(s.len(), 8 * x.len());
// TODO(tarcieri): use `array_chunks` to eliminate `unwrap`
#[allow(clippy::unwrap_used)]
for (i, b) in x.iter_mut().enumerate() {
*b = u64::from_be_bytes(s[(i * 8)..((i + 1) * 8)].try_into().unwrap());
}
s.chunks_exact(8)
.map(|c| c.try_into().unwrap())
.map(u64::from_be_bytes)
.zip(x.iter_mut())
.for_each(|(inp, out)| *out = inp);
for i in start as u64..(start + rounds) as u64 {
x[2] ^= ((0xfu64 - i) << 4) | i;