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| 1 /* ***** BEGIN LICENSE BLOCK ***** |
| 2 * Version: MPL 1.1/GPL 2.0/LGPL 2.1 |
| 3 * |
| 4 * The contents of this file are subject to the Mozilla Public License Version |
| 5 * 1.1 (the "License"); you may not use this file except in compliance with |
| 6 * the License. You may obtain a copy of the License at |
| 7 * http://www.mozilla.org/MPL/ |
| 8 * |
| 9 * Software distributed under the License is distributed on an "AS IS" basis, |
| 10 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License |
| 11 * for the specific language governing rights and limitations under the |
| 12 * License. |
| 13 * |
| 14 * The Original Code is the Netscape security libraries. |
| 15 * |
| 16 * The Initial Developer of the Original Code is |
| 17 * Netscape Communications Corporation. |
| 18 * Portions created by the Initial Developer are Copyright (C) 1994-2000 |
| 19 * the Initial Developer. All Rights Reserved. |
| 20 * |
| 21 * Contributor(s): |
| 22 * |
| 23 * Alternatively, the contents of this file may be used under the terms of |
| 24 * either the GNU General Public License Version 2 or later (the "GPL"), or |
| 25 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), |
| 26 * in which case the provisions of the GPL or the LGPL are applicable instead |
| 27 * of those above. If you wish to allow use of your version of this file only |
| 28 * under the terms of either the GPL or the LGPL, and not to allow others to |
| 29 * use your version of this file under the terms of the MPL, indicate your |
| 30 * decision by deleting the provisions above and replace them with the notice |
| 31 * and other provisions required by the GPL or the LGPL. If you do not delete |
| 32 * the provisions above, a recipient may use your version of this file under |
| 33 * the terms of any one of the MPL, the GPL or the LGPL. |
| 34 * |
| 35 * ***** END LICENSE BLOCK ***** */ |
| 36 |
1 // This file exists to provide the secure memcmp function. This was added in | 37 // This file exists to provide the secure memcmp function. This was added in |
2 // NSS 3.12.5. | 38 // NSS 3.12.5. |
3 | 39 |
4 #include <stdlib.h> | 40 #include <stdlib.h> |
5 | 41 |
6 /* | 42 /* |
7 * Perform a constant-time compare of two memory regions. The return value is | 43 * Perform a constant-time compare of two memory regions. The return value is |
8 * 0 if the memory regions are equal and non-zero otherwise. | 44 * 0 if the memory regions are equal and non-zero otherwise. |
9 */ | 45 */ |
10 int | 46 int |
11 NSS_SecureMemcmp(const void *ia, const void *ib, size_t n) | 47 NSS_SecureMemcmp(const void *ia, const void *ib, size_t n) |
12 { | 48 { |
13 const unsigned char *a = (const unsigned char*) ia; | 49 const unsigned char *a = (const unsigned char*) ia; |
14 const unsigned char *b = (const unsigned char*) ib; | 50 const unsigned char *b = (const unsigned char*) ib; |
15 size_t i; | 51 size_t i; |
16 unsigned char r = 0; | 52 unsigned char r = 0; |
17 | 53 |
18 for (i = 0; i < n; ++i) { | 54 for (i = 0; i < n; ++i) { |
19 r |= *a++ ^ *b++; | 55 r |= *a++ ^ *b++; |
20 } | 56 } |
21 | 57 |
22 return r; | 58 return r; |
23 } | 59 } |
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