mirror/zig
1
0
Fork 0
mirror of https://github.com/ziglang/zig.git synced 2026-01-20 14:25:16 +00:00
Code Issues Packages Projects Releases Wiki Activity

std.crypto.pwhash.bcrypt: inline the Feistel network function (#13416)

Browse Source 
std/crypto/benchmark.zig results:

* Intel i5

before: 3.144 s/ops
 after: 1.922 s/ops

* Apple M1

before: 2.067 s/ops
 after: 1.373 s/ops
This commit is contained in:
Frank Denis 2022-11-03 13:10:08 +01:00 committed by GitHub
parent e64eef366c
commit 96793530cd
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 7 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
lib/std/crypto/bcrypt.zig
View File

@ -374,22 +374,18 @@ pub const State = struct {
const Halves = struct { l: u32, r: u32 };
fn feistelF(state: State, x: u32) u32 {
var r = state.sboxes[0][@truncate(u8, x >> 24)];
r +%= state.sboxes[1][@truncate(u8, x >> 16)];
r ^= state.sboxes[2][@truncate(u8, x >> 8)];
r +%= state.sboxes[3][@truncate(u8, x)];
return r;
}
fn halfRound(state: State, i: u32, j: u32, n: usize) u32 {
return i ^ state.feistelF(j) ^ state.subkeys[n];
var r = state.sboxes[0][@truncate(u8, j >> 24)];
r +%= state.sboxes[1][@truncate(u8, j >> 16)];
r ^= state.sboxes[2][@truncate(u8, j >> 8)];
r +%= state.sboxes[3][@truncate(u8, j)];
return i ^ r ^ state.subkeys[n];
}
fn encipher(state: State, halves: *Halves) void {
halves.l ^= state.subkeys[0];
var i: usize = 1;
while (i < 16) : (i += 2) {
comptime var i = 1;
inline while (i < 16) : (i += 2) {
halves.r = state.halfRound(halves.r, halves.l, i);
halves.l = state.halfRound(halves.l, halves.r, i + 1);
}