91 lines
2.3 KiB
C
91 lines
2.3 KiB
C
/*
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* Zeroize demonstration program
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*
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* Copyright (C) 2017, ARM Limited, All Rights Reserved
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* This file is part of mbed TLS (https://tls.mbed.org)
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*/
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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "mbedtls/config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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#include <stdio.h>
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#if defined(MBEDTLS_PLATFORM_C)
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#include "mbedtls/platform.h"
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#else
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#include <stdlib.h>
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#define mbedtls_printf printf
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#define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
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#define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
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#endif
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#include "mbedtls/utils.h"
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#define BUFFER_LEN 1024
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void usage( void )
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{
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mbedtls_printf( "Zeroize is a simple program to assist with testing\n" );
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mbedtls_printf( "the mbedtls_zeroize() function by using the\n" );
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mbedtls_printf( "debugger. This program takes a file as input and\n" );
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mbedtls_printf( "prints the first %d characters. Usage:\n\n", BUFFER_LEN );
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mbedtls_printf( " zeroize <FILE>\n" );
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}
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int main( int argc, char** argv )
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{
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int exit_code = MBEDTLS_EXIT_FAILURE;
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FILE *fp;
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char buf[BUFFER_LEN];
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char *p = buf;
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char *end = p + BUFFER_LEN;
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char c;
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if( argc != 2 )
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{
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mbedtls_printf( "This program takes exactly 1 agument\n" );
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usage();
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return( exit_code );
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}
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fp = fopen( argv[1], "r" );
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if( fp == NULL )
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{
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mbedtls_printf( "Could not open file '%s'\n", argv[1] );
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return( exit_code );
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}
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while( ( c = fgetc( fp ) ) != EOF && p < end - 1 )
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*p++ = c;
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*p = '\0';
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if( p - buf != 0 )
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{
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mbedtls_printf( "%s\n", buf );
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exit_code = MBEDTLS_EXIT_SUCCESS;
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}
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else
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mbedtls_printf( "The file is empty!\n" );
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fclose( fp );
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mbedtls_zeroize( buf, sizeof( buf ) );
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return( exit_code );
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}
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