osfmk/corecrypto/cc/src/cc_clear.c

/*
 *  cc_clear.c
 *  corecrypto
 *
 *  Created on 05/21/2014
 *
 *  Copyright (c) 2014,2015 Apple Inc. All rights reserved.
 *
 */

#include <corecrypto/cc.h>

//rdar://problem/26986552

#if ( CC_HAS_MEMSET_S == 1 ) && (defined( __STDC_WANT_LIB_EXT1__ ) && ( __STDC_WANT_LIB_EXT1__ == 1 ) )
void cc_clear(size_t len, void *dst)
{
    memset_s(dst,len,0,len);
}
#elif defined(_WIN32) && !defined(__clang__) //Clang with Microsoft CodeGen, doesn't support SecureZeroMemory
#include <windows.h>
static void cc_clear(size_t len, void *dst)
{
    SecureZeroMemory(dst, len);
}
#else
void cc_clear(size_t len, void *dst)
{
    volatile char *vptr = (volatile char *)dst;
    while (len--)
        *vptr++ = '\0';
}
#endif

/* This is an altarnative for clang that should work
 void cc_clear(size_t len, void *dst) __attribute__ ((optnone))
 {
 cc_zero(len,dst);
 }
*/
Commit	Line	Data
	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
	11	#include <corecrypto/cc.h>
	12
	13	//rdar://problem/26986552
	14
	15	#if ( CC_HAS_MEMSET_S == 1 ) && (defined( __STDC_WANT_LIB_EXT1__ ) && ( __STDC_WANT_LIB_EXT1__ == 1 ) )
	16	void cc_clear(size_t len, void *dst)
	17	{
	18	memset_s(dst,len,0,len);
	19	}
	20	#elif defined(_WIN32) && !defined(__clang__) //Clang with Microsoft CodeGen, doesn't support SecureZeroMemory
	21	#include <windows.h>
	22	static void cc_clear(size_t len, void *dst)
	23	{
	24	SecureZeroMemory(dst, len);
	25	}
	26	#else
	27	void cc_clear(size_t len, void *dst)
	28	{
	29	volatile char vptr = (volatile char )dst;
	30	while (len--)
	31	*vptr++ = '\0';
	32	}
	33	#endif
	34
	35	/* This is an altarnative for clang that should work
	36	void cc_clear(size_t len, void *dst) __attribute__ ((optnone))
	37	{
	38	cc_zero(len,dst);
	39	}
	40	*/