2 * Zeroize application for debugger-driven testing
4 * This is a simple test application used for debugger-driven testing to check
5 * whether calls to mbedtls_platform_zeroize() are being eliminated by compiler
6 * optimizations. This application is used by the GDB script at
7 * tests/scripts/test_zeroize.gdb under the assumption that the code does not
8 * change often (as opposed to the library code) because the script sets a
9 * breakpoint at the last return statement in the main() function of this
10 * program. The debugger facilities are then used to manually inspect the
11 * memory and verify that the call to mbedtls_platform_zeroize() was not
14 * Copyright (C) 2018, Arm Limited, All Rights Reserved
15 * SPDX-License-Identifier: Apache-2.0
17 * Licensed under the Apache License, Version 2.0 (the "License"); you may
18 * not use this file except in compliance with the License.
19 * You may obtain a copy of the License at
21 * http://www.apache.org/licenses/LICENSE-2.0
23 * Unless required by applicable law or agreed to in writing, software
24 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
25 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
26 * See the License for the specific language governing permissions and
27 * limitations under the License.
29 * This file is part of mbed TLS (https://tls.mbed.org)
32 #if !defined(MBEDTLS_CONFIG_FILE)
33 #include "mbedtls/config.h"
35 #include MBEDTLS_CONFIG_FILE
40 #if defined(MBEDTLS_PLATFORM_C)
41 #include "mbedtls/platform.h"
44 #define mbedtls_printf printf
45 #define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
46 #define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
49 #include "mbedtls/platform_util.h"
51 #define BUFFER_LEN 1024
55 mbedtls_printf( "Zeroize is a simple program to assist with testing\n" );
56 mbedtls_printf( "the mbedtls_platform_zeroize() function by using the\n" );
57 mbedtls_printf( "debugger. This program takes a file as input and\n" );
58 mbedtls_printf( "prints the first %d characters. Usage:\n\n", BUFFER_LEN );
59 mbedtls_printf( " zeroize <FILE>\n" );
62 int main( int argc, char** argv )
64 int exit_code = MBEDTLS_EXIT_FAILURE;
68 char *end = p + BUFFER_LEN;
73 mbedtls_printf( "This program takes exactly 1 agument\n" );
78 fp = fopen( argv[1], "r" );
81 mbedtls_printf( "Could not open file '%s'\n", argv[1] );
85 while( ( c = fgetc( fp ) ) != EOF && p < end - 1 )
91 mbedtls_printf( "%s\n", buf );
92 exit_code = MBEDTLS_EXIT_SUCCESS;
95 mbedtls_printf( "The file is empty!\n" );
98 mbedtls_platform_zeroize( buf, sizeof( buf ) );