1 /**
2 * \brief Use and generate random data into a file via the CTR_DBRG based on AES
3 *
4 * Copyright The Mbed TLS Contributors
5 * SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
6 *
7 * This file is provided under the Apache License 2.0, or the
8 * GNU General Public License v2.0 or later.
9 *
10 * **********
11 * Apache License 2.0:
12 *
13 * Licensed under the Apache License, Version 2.0 (the "License"); you may
14 * not use this file except in compliance with the License.
15 * You may obtain a copy of the License at
16 *
17 * http://www.apache.org/licenses/LICENSE-2.0
18 *
19 * Unless required by applicable law or agreed to in writing, software
20 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
21 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
22 * See the License for the specific language governing permissions and
23 * limitations under the License.
24 *
25 * **********
26 *
27 * **********
28 * GNU General Public License v2.0 or later:
29 *
30 * This program is free software; you can redistribute it and/or modify
31 * it under the terms of the GNU General Public License as published by
32 * the Free Software Foundation; either version 2 of the License, or
33 * (at your option) any later version.
34 *
35 * This program is distributed in the hope that it will be useful,
36 * but WITHOUT ANY WARRANTY; without even the implied warranty of
37 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
38 * GNU General Public License for more details.
39 *
40 * You should have received a copy of the GNU General Public License along
41 * with this program; if not, write to the Free Software Foundation, Inc.,
42 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
43 *
44 * **********
45 */
46
47 #if !defined(MBEDTLS_CONFIG_FILE)
48 #include "mbedtls/config.h"
49 #else
50 #include MBEDTLS_CONFIG_FILE
51 #endif
52
53 #if defined(MBEDTLS_PLATFORM_C)
54 #include "mbedtls/platform.h"
55 #else
56 #include <stdio.h>
57 #include <stdlib.h>
58 #define mbedtls_fprintf fprintf
59 #define mbedtls_printf printf
60 #define mbedtls_exit exit
61 #define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
62 #define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
63 #endif /* MBEDTLS_PLATFORM_C */
64
65 #if defined(MBEDTLS_CTR_DRBG_C) && defined(MBEDTLS_ENTROPY_C) && \
66 defined(MBEDTLS_FS_IO)
67 #include "mbedtls/entropy.h"
68 #include "mbedtls/ctr_drbg.h"
69
70 #include <stdio.h>
71 #endif
72
73 #if !defined(MBEDTLS_CTR_DRBG_C) || !defined(MBEDTLS_ENTROPY_C) || \
74 !defined(MBEDTLS_FS_IO)
main(void)75 int main( void )
76 {
77 mbedtls_printf("MBEDTLS_CTR_DRBG_C and/or MBEDTLS_ENTROPY_C and/or MBEDTLS_FS_IO not defined.\n");
78 mbedtls_exit( 0 );
79 }
80 #else
81
82
main(int argc,char * argv[])83 int main( int argc, char *argv[] )
84 {
85 FILE *f;
86 int i, k, ret = 1;
87 int exit_code = MBEDTLS_EXIT_FAILURE;
88 mbedtls_ctr_drbg_context ctr_drbg;
89 mbedtls_entropy_context entropy;
90 unsigned char buf[1024];
91
92 mbedtls_ctr_drbg_init( &ctr_drbg );
93
94 if( argc < 2 )
95 {
96 mbedtls_fprintf( stderr, "usage: %s <output filename>\n", argv[0] );
97 mbedtls_exit( exit_code );
98 }
99
100 if( ( f = fopen( argv[1], "wb+" ) ) == NULL )
101 {
102 mbedtls_printf( "failed to open '%s' for writing.\n", argv[1] );
103 mbedtls_exit( exit_code );
104 }
105
106 mbedtls_entropy_init( &entropy );
107 ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy, (const unsigned char *) "RANDOM_GEN", 10 );
108 if( ret != 0 )
109 {
110 mbedtls_printf( "failed in mbedtls_ctr_drbg_seed: %d\n", ret );
111 goto cleanup;
112 }
113 mbedtls_ctr_drbg_set_prediction_resistance( &ctr_drbg, MBEDTLS_CTR_DRBG_PR_OFF );
114
115 #if defined(MBEDTLS_FS_IO)
116 ret = mbedtls_ctr_drbg_update_seed_file( &ctr_drbg, "seedfile" );
117
118 if( ret == MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR )
119 {
120 mbedtls_printf( "Failed to open seedfile. Generating one.\n" );
121 ret = mbedtls_ctr_drbg_write_seed_file( &ctr_drbg, "seedfile" );
122 if( ret != 0 )
123 {
124 mbedtls_printf( "failed in mbedtls_ctr_drbg_write_seed_file: %d\n", ret );
125 goto cleanup;
126 }
127 }
128 else if( ret != 0 )
129 {
130 mbedtls_printf( "failed in mbedtls_ctr_drbg_update_seed_file: %d\n", ret );
131 goto cleanup;
132 }
133 #endif
134
135 for( i = 0, k = 768; i < k; i++ )
136 {
137 ret = mbedtls_ctr_drbg_random( &ctr_drbg, buf, sizeof( buf ) );
138 if( ret != 0 )
139 {
140 mbedtls_printf("failed!\n");
141 goto cleanup;
142 }
143
144 fwrite( buf, 1, sizeof( buf ), f );
145
146 mbedtls_printf( "Generating %ldkb of data in file '%s'... %04.1f" \
147 "%% done\r", (long)(sizeof(buf) * k / 1024), argv[1], (100 * (float) (i + 1)) / k );
148 fflush( stdout );
149 }
150
151 exit_code = MBEDTLS_EXIT_SUCCESS;
152
153 cleanup:
154 mbedtls_printf("\n");
155
156 fclose( f );
157 mbedtls_ctr_drbg_free( &ctr_drbg );
158 mbedtls_entropy_free( &entropy );
159
160 mbedtls_exit( exit_code );
161 }
162 #endif /* MBEDTLS_CTR_DRBG_C && MBEDTLS_ENTROPY_C */
163