mbedtls/programs/test/zeroize.c
Bence Szépkúti a2947ac7bb Update copyright notices to use Linux Foundation guidance
As a result, the copyright of contributors other than Arm is now
acknowledged, and the years of publishing are no longer tracked in the
source files.

Also remove the now-redundant lines declaring that the files are part of
MbedTLS.

This commit was generated using the following script:

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Signed-off-by: Bence Szépkúti <bence.szepkuti@arm.com>
2020-08-19 16:37:36 +02:00

126 lines
3.9 KiB
C

/*
* Zeroize application for debugger-driven testing
*
* This is a simple test application used for debugger-driven testing to check
* whether calls to mbedtls_platform_zeroize() are being eliminated by compiler
* optimizations. This application is used by the GDB script at
* tests/scripts/test_zeroize.gdb: the script sets a breakpoint at the last
* return statement in the main() function of this program. The debugger
* facilities are then used to manually inspect the memory and verify that the
* call to mbedtls_platform_zeroize() was not eliminated.
*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
*
* This file is provided under the Apache License 2.0, or the
* GNU General Public License v2.0 or later.
*
* **********
* Apache License 2.0:
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* **********
*
* **********
* GNU General Public License v2.0 or later:
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* **********
*/
#if !defined(MBEDTLS_CONFIG_FILE)
#include "mbedtls/config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif
#include <stdio.h>
#if defined(MBEDTLS_PLATFORM_C)
#include "mbedtls/platform.h"
#else
#include <stdlib.h>
#define mbedtls_printf printf
#define mbedtls_exit exit
#define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
#define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
#endif
#include "mbedtls/platform_util.h"
#define BUFFER_LEN 1024
void usage( void )
{
mbedtls_printf( "Zeroize is a simple program to assist with testing\n" );
mbedtls_printf( "the mbedtls_platform_zeroize() function by using the\n" );
mbedtls_printf( "debugger. This program takes a file as input and\n" );
mbedtls_printf( "prints the first %d characters. Usage:\n\n", BUFFER_LEN );
mbedtls_printf( " zeroize <FILE>\n" );
}
int main( int argc, char** argv )
{
int exit_code = MBEDTLS_EXIT_FAILURE;
FILE *fp;
char buf[BUFFER_LEN];
char *p = buf;
char *end = p + BUFFER_LEN;
int c;
if( argc != 2 )
{
mbedtls_printf( "This program takes exactly 1 agument\n" );
usage();
mbedtls_exit( exit_code );
}
fp = fopen( argv[1], "r" );
if( fp == NULL )
{
mbedtls_printf( "Could not open file '%s'\n", argv[1] );
mbedtls_exit( exit_code );
}
while( ( c = fgetc( fp ) ) != EOF && p < end - 1 )
*p++ = (char)c;
*p = '\0';
if( p - buf != 0 )
{
mbedtls_printf( "%s\n", buf );
exit_code = MBEDTLS_EXIT_SUCCESS;
}
else
mbedtls_printf( "The file is empty!\n" );
fclose( fp );
mbedtls_platform_zeroize( buf, sizeof( buf ) );
mbedtls_exit( exit_code ); // GDB_BREAK_HERE -- don't remove this comment!
}