diff options
| author | palmer@chromium.org <palmer@chromium.org@0039d316-1c4b-4281-b951-d872f2087c98> | 2011-10-07 17:02:48 +0000 |
|---|---|---|
| committer | palmer@chromium.org <palmer@chromium.org@0039d316-1c4b-4281-b951-d872f2087c98> | 2011-10-07 17:02:48 +0000 |
| commit | 3cdf6d45936b29b4a412b94a599a93f6e181f210 (patch) | |
| tree | 13cc95603495aba95e1add06a2adbde7776dff25 /crypto/secure_util.cc | |
| parent | 11da0c8d10cc58194f07b48b428ed16d14b08f9d (diff) | |
| download | chromium_src-3cdf6d45936b29b4a412b94a599a93f6e181f210.zip chromium_src-3cdf6d45936b29b4a412b94a599a93f6e181f210.tar.gz chromium_src-3cdf6d45936b29b4a412b94a599a93f6e181f210.tar.bz2 | |
Make constant-time comparison operators for cryptographic uses public.
Review URL: http://codereview.chromium.org/8124011
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@104502 0039d316-1c4b-4281-b951-d872f2087c98
Diffstat (limited to 'crypto/secure_util.cc')
| -rw-r--r-- | crypto/secure_util.cc | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/crypto/secure_util.cc b/crypto/secure_util.cc new file mode 100644 index 0000000..3fe8aa9 --- /dev/null +++ b/crypto/secure_util.cc @@ -0,0 +1,19 @@ +// Copyright (c) 2011 The Chromium Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. + +#include "crypto/secure_util.h" + +namespace crypto { + +bool SecureMemEqual(const void* s1, const void* s2, size_t n) { + const unsigned char* s1_ptr = reinterpret_cast<const unsigned char*>(s1); + const unsigned char* s2_ptr = reinterpret_cast<const unsigned char*>(s2); + unsigned char tmp = 0; + for (size_t i = 0; i < n; ++i, ++s1_ptr, ++s2_ptr) + tmp |= *s1_ptr ^ *s2_ptr; + return (tmp == 0); +} + +} // namespace crypto + |