motiejus/zig
1
Fork 0
Code Releases Activity

std.crypto: cosmetic improvement to AES multiplication algorithm (#11616)

Browse Source 
std.crypto: cosmetic improvement to AES multiplication algorithm (#11616)
This commit is contained in:
Helio Machado
2022-05-25 19:23:49 +02:00
committed by GitHub
parent 71e2a56e3e
commit e0be22b6c0
1 changed files with 8 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
lib/std/crypto/aes/soft.zig
View File

@@ -489,21 +489,18 @@ fn generateTable(invert: bool) [4][256]u32 {
fn mul(a: u8, b: u8) u8 {
@setEvalBranchQuota(30000);
var i: u9 = a;
var j: u8 = b;
var k: u8 = 1;
var i: u8 = a;
var j: u9 = b;
var s: u9 = 0;
while (k < 0x100 and j != 0) : (k <<= 1) {
if (j & k != 0) {
s ^= i;
j ^= k;
while (i > 0) : (i >>= 1) {
if (i & 1 != 0) {
s ^= j;
}
i <<= 1;
if (i & 0x100 != 0) {
i ^= poly;
j *= 2;
if (j & 0x100 != 0) {
j ^= poly;
}
}