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 #if (CC_HAS_MEMSET_S == 1) && (defined(__STDC_WANT_LIB_EXT1__) && (__STDC_WANT_LIB_EXT1__ == 1))
39 void
cc_clear(size_t len,void * dst)40 cc_clear(size_t len, void *dst)
41 {
42 FIPSPOST_TRACE_EVENT;
43 memset_s(dst, len, 0, len);
44 }
45 #elif defined(_WIN32) && !defined(__clang__) //Clang with Microsoft CodeGen, doesn't support SecureZeroMemory
46 #include <windows.h>
47 static void
cc_clear(size_t len,void * dst)48 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 cc_clear(size_t len, void *dst)
55 {
56 FIPSPOST_TRACE_EVENT;
57 volatile char *vptr = (volatile char *)dst;
58 while (len--) {
59 *vptr++ = '\0';
60 }
61 }
62 #endif
63