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%% options
copyright owner = Dirk Krause
copyright year = 2015-xxxx
SPDX-License-Identifier: BSD-3-Clause
%% header
/** @file dk4memrs.h Secure memory reset.
Securely reset byte buffer to 0x00 bytes.
*/
#ifdef __cplusplus
extern "C" {
#endif
/** Secure memory reset.
CRT on Windows: Not used.
@param ptr Start address of memory range.
@param sz Size of memory range in bytes.
@param erp Error report, may be NULL.
@return 1 on success, 0 on error. You should not ignore the
return value.
Error codes:
- DK4_E_INVALID_ARGUMENTS<br>
if ptr is NULL or sz is 0,
- DK4_E_BUG<br>
if one of the bytes in the buffer is not 0 during check.
*/
int
dk4mem_reset_secure(void *ptr, size_t sz, dk4_er_t *erp);
#ifdef __cplusplus
}
#endif
%% module
#include "dk4conf.h"
#ifndef STDIO_H_INCLUDED
#include <stdio.h>
#define STDIO_H_INCLUDED 1
#endif
#ifndef STDLIB_H_INCLUDED
#include <stdlib.h>
#define STDLIB_H_INCLUDED 1
#endif
#if DK4_ON_WINDOWS
#ifndef WINDOWS_H_INCLUDED
#include <windows.h>
#define WINDOWS_H_INCLUDED 1
#endif
#endif
#if DK4_HAVE_ASSERT_H
#ifndef ASSERT_H_INCLUDED
#include <assert.h>
#define ASSERT_H_INCLUDED 1
#endif
#endif
#include "dk4mem.h"
#include "dk4memrs.h"
$!trace-include
#ifndef DK4MEMRS_PARANOID_CHECK
#define DK4MEMRS_PARANOID_CHECK 0
#endif
int
dk4mem_reset_secure(void *ptr, size_t sz, dk4_er_t *erp)
{
#if (!DK4_ON_WINDOWS) && (DK4MEMRS_PARANOID_CHECK)
unsigned char *p1;
#endif
int back = 0;
#if DK4_USE_ASSERT
assert(NULL != ptr);
assert(0 < sz);
#endif
if ((NULL != ptr) && (0 < sz)) {
#if DK4_ON_WINDOWS
SecureZeroMemory(ptr, sz);
back = 1;
#else
DK4_MEMRES(ptr, sz);
back = 1;
#if DK4MEMRS_PARANOID_CHECK
p1 = (unsigned char *)ptr;
while((0 != back) && (sz--)) {
if ('\0' != *(p1++)) {
back = 0;
dk4error_set_simple_error_code(erp, DK4_E_BUG);
}
}
#endif
#endif
} else {
dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
}
return back;
}
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