Commit f3fbdf2b44e37d2522c0c879f46c5dee057c14bd | zig

author	none <189900@gmail.com> 2023-08-05 12:45:33+03:00
committer	Andrew Kelley <andrew@ziglang.org> 2023-08-05 15:30:50-07:00
log	f3fbdf2b44e37d2522c0c879f46c5dee057c14bd
tree	4db4499784aa0a7392c4adbe30a37b2a8bd1b084
parent	90fde14c5f4406c284ec030186172b3db4697258

Update calls with input longer then one block must ensure that
last sixteen bytes are available when final is called.

Fixes #16695

1 files changed, 20 insertions(+), 0 deletions(-)

lib/std/hash/wyhash.zig+20

...	...	@@ -57,6 +57,10 @@ pub const Wyhash = struct {
57	57	}
58	58
59	59	const remaining_bytes = input[i..];
	60	if (remaining_bytes.len < 16 and i >= 48) {
	61	const rem = 16 - remaining_bytes.len;
	62	@memcpy(self.buf[self.buf.len - rem ..], input[i - rem .. i]);
	63	}
60	64	@memcpy(self.buf[0..remaining_bytes.len], remaining_bytes);
61	65	self.buf_len = remaining_bytes.len;
62	66	}
...	...	@@ -271,3 +275,19 @@ test "iterative non-divisible update" {
271	275	try std.testing.expectEqual(iterative_hash, non_iterative_hash);
272	276	}
273	277	}
	278
	279	test "iterative maintains last sixteen" {
	280	const input = "Z" ** 48 ++ "01234567890abcdefg";
	281	const seed = 0;
	282
	283	for (0..17) \|i\| {
	284	const payload = input[0 .. input.len - i];
	285	const non_iterative_hash = Wyhash.hash(seed, payload);
	286
	287	var wh = Wyhash.init(seed);
	288	wh.update(payload);
	289	const iterative_hash = wh.final();
	290
	291	try expectEqual(non_iterative_hash, iterative_hash);
	292	}
	293	}