1 | /* |
2 | * cc_clear.c |
3 | * corecrypto |
4 | * |
5 | * Created on 05/21/2014 |
6 | * |
7 | * Copyright (c) 2014,2015 Apple Inc. All rights reserved. |
8 | * |
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@ |
33 | */ |
34 | |
35 | #include <corecrypto/cc.h> |
36 | #include "corecrypto/fipspost_trace.h" |
37 | |
38 | //rdar://problem/26986552 |
39 | |
40 | #if ( CC_HAS_MEMSET_S == 1 ) && (defined( __STDC_WANT_LIB_EXT1__ ) && ( __STDC_WANT_LIB_EXT1__ == 1 ) ) |
41 | void cc_clear(size_t len, void *dst) |
42 | { |
43 | FIPSPOST_TRACE_EVENT; |
44 | memset_s(dst,len,0,len); |
45 | } |
46 | #elif defined(_WIN32) && !defined(__clang__) //Clang with Microsoft CodeGen, doesn't support SecureZeroMemory |
47 | #include <windows.h> |
48 | static void cc_clear(size_t len, void *dst) |
49 | { |
50 | SecureZeroMemory(dst, len); |
51 | } |
52 | #else |
53 | void cc_clear(size_t len, void *dst) |
54 | { |
55 | FIPSPOST_TRACE_EVENT; |
56 | volatile char *vptr = (volatile char *)dst; |
57 | while (len--) |
58 | *vptr++ = '\0'; |
59 | } |
60 | #endif |
61 | |
62 | /* This is an altarnative for clang that should work |
63 | void cc_clear(size_t len, void *dst) __attribute__ ((optnone)) |
64 | { |
65 | cc_zero(len,dst); |
66 | } |
67 | */ |
68 | |