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timingsafe_memcmp.c

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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++) {
i < lenDescription
TRUEevaluated 2929930 times by 8 tests
Evaluated by:
  • aeadtest
  • bytestringtest
  • rsa_test
  • ssltest
  • timingsafe
  • tlsexttest
  • tlstest
  • x25519test
FALSEevaluated 362069 times by 8 tests
Evaluated by:
  • aeadtest
  • bytestringtest
  • rsa_test
  • ssltest
  • timingsafe
  • tlsexttest
  • tlstest
  • x25519test
362069-2929930
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 }
executed 2929930 times by 8 tests: end of block
Executed by:
  • aeadtest
  • bytestringtest
  • rsa_test
  • ssltest
  • timingsafe
  • tlsexttest
  • tlstest
  • x25519test
2929930
44-
45 return (res);
executed 362069 times by 8 tests: return (res);
Executed by:
  • aeadtest
  • bytestringtest
  • rsa_test
  • ssltest
  • timingsafe
  • tlsexttest
  • tlstest
  • x25519test
362069
46}-
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