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std.crypto.aegis: Absorb ad instead of encrypting it.

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`Aegis256XGeneric` behaves differently than `Aegis128XGeneric` in that
it currently encrypts associated data instead of just absorbing it. Even
though the end result is the same, there's no point in encrypting and
copying the ad into a buffer that gets overwritten anyway. This fix
makes `Aegis256XGeneric` behave the same as `Aegis128XGeneric`.
This commit is contained in:
Erik Schlyter 2025-08-12 12:40:49 +02:00 committed by Alex Rønne Petersen
parent 113d3dd3f0
commit 7abd62800c
1 changed files with 2 additions and 2 deletions
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4
lib/std/crypto/aegis.zig
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@ -585,12 +585,12 @@ fn Aegis256XGeneric(comptime degree: u7, comptime tag_bits: u9) type {
var dst: [block_length]u8 align(alignment) = undefined;
var i: usize = 0;
while (i + block_length <= ad.len) : (i += block_length) {
state.enc(&dst, ad[i..][0..block_length]);
state.absorb(ad[i..][0..block_length]);
}
if (ad.len % block_length != 0) {
@memset(src[0..], 0);
@memcpy(src[0 .. ad.len % block_length], ad[i..][0 .. ad.len % block_length]);
state.enc(&dst, &src);
state.absorb(&src);
}
i = 0;
while (i + block_length <= m.len) : (i += block_length) {