| author |  Helio Machado <0x2b3bfa0+git@googlemail.com> 2022-05-25 19:23:49+02:00 |
| committer |  GitHub <noreply@github.com> 2022-05-25 19:23:49+02:00 |
| log | e0be22b6c06530d56308853723f982c492e768fd |
| tree | 5903df885bfb415053eb03b8feefd659a838f7e0 |
| parent | 71e2a56e3ef7aba10cc0648aab786973cf8416bc |
| signature |  Signed by PGP key 4AEE18F83AFDEB23 |
std.crypto: cosmetic improvement to AES multiplication algorithm (#11616)
std.crypto: cosmetic improvement to AES multiplication algorithm (#11616)1 files changed, 8 insertions(+), 11 deletions(-)
lib- std
- crypto
- aes
lib/std/crypto/aes/soft.zig+8-11
| ... | ... | @@ -489,21 +489,18 @@ fn generateTable(invert: bool) [4][256]u32 { |
| 489 | 489 | fn mul(a: u8, b: u8) u8 { |
| 490 | 490 | @setEvalBranchQuota(30000); |
| 491 | 491 | |
| 492 | var i: u9 = a; | |
| 493 | var j: u8 = b; | |
| 494 | var k: u8 = 1; | |
| 492 | var i: u8 = a; | |
| 493 | var j: u9 = b; | |
| 495 | 494 | var s: u9 = 0; |
| 496 | 495 | |
| 497 | while (k < 0x100 and j != 0) : (k <<= 1) { | |
| 498 | if (j & k != 0) { | |
| 499 | s ^= i; | |
| 500 | j ^= k; | |
| 496 | while (i > 0) : (i >>= 1) { | |
| 497 | if (i & 1 != 0) { | |
| 498 | s ^= j; | |
| 501 | 499 | } |
| 502 | 500 | |
| 503 | i <<= 1; | |
| 504 | ||
| 505 | if (i & 0x100 != 0) { | |
| 506 | i ^= poly; | |
| 501 | j *= 2; | |
| 502 | if (j & 0x100 != 0) { | |
| 503 | j ^= poly; | |
| 507 | 504 | } |
| 508 | 505 | } |
| 509 | 506 |