projects / apple / xnu.git / blame
| Commit | Line | Data |
|---|---|---|
| 39037602 A |
1 | /* |
| 2 | * cc_cmp_safe.c | |
| 3 | * corecrypto | |
| 4 | * | |
| 5 | * Created on 04/22/2014 | |
| 6 | * | |
| 7 | * Copyright (c) 2014,2015 Apple Inc. All rights reserved. | |
| 8 | * | |
| 5ba3f43e A |
9 | * |
| 10 | * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ | |
| 11 | * | |
| 12 | * This file contains Original Code and/or Modifications of Original Code | |
| 13 | * as defined in and that are subject to the Apple Public Source License | |
| 14 | * Version 2.0 (the 'License'). You may not use this file except in | |
| 15 | * compliance with the License. The rights granted to you under the License | |
| 16 | * may not be used to create, or enable the creation or redistribution of, | |
| 17 | * unlawful or unlicensed copies of an Apple operating system, or to | |
| 18 | * circumvent, violate, or enable the circumvention or violation of, any | |
| 19 | * terms of an Apple operating system software license agreement. | |
| 20 | * | |
| 21 | * Please obtain a copy of the License at | |
| 22 | * http://www.opensource.apple.com/apsl/ and read it before using this file. | |
| 23 | * | |
| 24 | * The Original Code and all software distributed under the License are | |
| 25 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
| 26 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, | |
| 27 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| 28 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. | |
| 29 | * Please see the License for the specific language governing rights and | |
| 30 | * limitations under the License. | |
| 31 | * | |
| 32 | * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ | |
| 39037602 A |
33 | */ |
| 34 | ||
| 35 | #include <corecrypto/cc_priv.h> | |
| 36 | ||
| 0a7de745 A |
37 | int |
| 38 | cc_cmp_safe(size_t num, const void * ptr1, const void * ptr2) | |
| 39037602 | 39 | { |
| 0a7de745 A |
40 | size_t i; |
| 41 | const uint8_t *s = (const uint8_t *)ptr1; | |
| 42 | const uint8_t *t = (const uint8_t *)ptr2; | |
| 43 | uint8_t flag = ((num <= 0)?1:0); // If 0 return an error | |
| 44 | for (i = 0; i < num; i++) { | |
| 45 | flag |= (s[i] ^ t[i]); | |
| 46 | } | |
| cb323159 | 47 | CC_HEAVISIDE_STEP(flag, flag); // flag=(flag==0)?0:1; |
| 0a7de745 | 48 | return flag; // 0 iff all bytes were equal, 1 if there is any difference |
| 39037602 | 49 | } |