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authorcvs2svn <admin@example.com>2025-04-14 17:32:06 +0000
committercvs2svn <admin@example.com>2025-04-14 17:32:06 +0000
commiteb8dd9dca1228af0cd132f515509051ecfabf6f6 (patch)
treeedb6da6af7e865d488dc1a29309f1e1ec226e603 /src/lib/libc/string/timingsafe_memcmp.c
parent247f0352e0ed72a4f476db9dc91f4d982bc83eb2 (diff)
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This commit was manufactured by cvs2git to create tag 'tb_20250414'.tb_20250414
Diffstat (limited to 'src/lib/libc/string/timingsafe_memcmp.c')
-rw-r--r--src/lib/libc/string/timingsafe_memcmp.c47
1 files changed, 0 insertions, 47 deletions
diff --git a/src/lib/libc/string/timingsafe_memcmp.c b/src/lib/libc/string/timingsafe_memcmp.c
deleted file mode 100644
index 373f8cb197..0000000000
--- a/src/lib/libc/string/timingsafe_memcmp.c
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@@ -1,47 +0,0 @@
1/* $OpenBSD: timingsafe_memcmp.c,v 1.2 2015/08/31 02:53:57 guenther Exp $ */
2/*
3 * Copyright (c) 2014 Google Inc.
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18#include <limits.h>
19#include <string.h>
20
21int
22timingsafe_memcmp(const void *b1, const void *b2, size_t len)
23{
24 const unsigned char *p1 = b1, *p2 = b2;
25 size_t i;
26 int res = 0, done = 0;
27
28 for (i = 0; i < len; i++) {
29 /* lt is -1 if p1[i] < p2[i]; else 0. */
30 int lt = (p1[i] - p2[i]) >> CHAR_BIT;
31
32 /* gt is -1 if p1[i] > p2[i]; else 0. */
33 int gt = (p2[i] - p1[i]) >> CHAR_BIT;
34
35 /* cmp is 1 if p1[i] > p2[i]; -1 if p1[i] < p2[i]; else 0. */
36 int cmp = lt - gt;
37
38 /* set res = cmp if !done. */
39 res |= cmp & ~done;
40
41 /* set done if p1[i] != p2[i]. */
42 done |= lt | gt;
43 }
44
45 return (res);
46}
47DEF_WEAK(timingsafe_memcmp);